T480 Hardware Maintenance Manual

Note: Before using this information and the product it supports, be sure to read the general information under Appendix A “Notices” on page 103. First Edition (January 2018) © Copyright Lenovo 2018. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS- 35F-05925.

Contents About this manual . . . . . . . . . . . . iii Supervisor password. . . . . . . . . . . 33 Chapter 1. Safety information. . . . . . 1 How to remove the power-on password . . . 34 How to remove the hard disk password. . . . 34 General safety . . . . . . . . . . . . . . . . 1 Power management . . . . . . . . . . . . . 35 Electrical safety . . . . . . . . . . . . . . . . 1 Sleep mode . . . . . . . . . . . . . . 35 Safety inspection guide. . . . . . . . . . . . . 2 Hibernation mode . . . . . . . . . . . . 35 Handling devices that are sensitive to electrostatic Symptom-to-FRU index . . . . . . . . . . . 35 discharge . . . . . . . . . . . . . . . . . . 3 Numeric error codes . . . . . . . . . . . 36 Grounding requirements . . . . . . . . . . . . 4 Error messages . . . . . . . . . . . . . 37 Safety notices (multilingual translations) . . . . . . 4 Beep errors. . . . . . . . . . . . . . . 38 Chapter 2. Important service No-beep symptoms . . . . . . . . . . . 40 information. . . . . . . . . . . . . . . 21 LCD-related symptoms . . . . . . . . . . 40 Strategy for replacing FRUs . . . . . . . . . . 21 Intermittent problems. . . . . . . . . . . 41 Strategy for replacing a hard disk drive or a Undetermined problems . . . . . . . . . 41 solid-state drive . . . . . . . . . . . . . 21 Chapter 5. Status indicators . . . . . 43 Important notice for replacing a system board . . . . . . . . . . . . . . . . . 22 Chapter 6. Using the special keys. . . 45 How to use error message. . . . . . . . . 22 Strategy for replacing FRUs for CTO, special-bid, Chapter 7. Locations . . . . . . . . . 47 and standard models. . . . . . . . . . . . . 22 Product definition . . . . . . . . . . . . 22 Locating computer controls, connectors, and FRU identification . . . . . . . . . . . . 22 indicators . . . . . . . . . . . . . . . . . 47 Front view . . . . . . . . . . . . . . . 47 Chapter 3. General checkout . . . . . 25 Left-side view. . . . . . . . . . . . . . 48 What to do first . . . . . . . . . . . . . . . 25 Right-side view . . . . . . . . . . . . . 48 Checkout guide. . . . . . . . . . . . . . . 26 Bottom view . . . . . . . . . . . . . . 49 Diagnosing problems. . . . . . . . . . . 26 Locating FRUs and CRUs . . . . . . . . . . . 49 Quick test programs . . . . . . . . . . . 27 Major FRUs and CRUs . . . . . . . . . . 51 UEFI diagnostic program . . . . . . . . . 27 LCD FRUs . . . . . . . . . . . . . . . 53 Bootable diagnostic programs . . . . . . . 27 Miscellaneous parts . . . . . . . . . . . 54 Power system checkout . . . . . . . . . . . 28 Connector and cable guide . . . . . . . . 54 Checking the ac power adapter. . . . . . . 29 Looking up FRU information . . . . . . . . . . 58 Checking the removable battery and the Chapter 8. FRU replacement operational charging . . . . . . . . . . . 29 notices . . . . . . . . . . . . . . . . . 59 Checking the coin-cell battery . . . . . . . 30 Screw notices . . . . . . . . . . . . . . . 59 Chapter 4. Related service Retaining serial numbers . . . . . . . . . . . 60 information. . . . . . . . . . . . . . . 31 Restoring the serial number of the system Recovery information for the Windows 10 unit . . . . . . . . . . . . . . . . . . 60 operating system . . . . . . . . . . . . . . 31 Retaining the UUID. . . . . . . . . . . . 61 Resetting your computer . . . . . . . . . 31 Reading or writing the ECA information. . . . 61 Using advanced startup options . . . . . . 31 Chapter 9. Removing or replacing a Recovering your operating system if Windows FRU. . . . . . . . . . . . . . . . . . . 63 10 fails to start . . . . . . . . . . . . . 32 Creating and using a recovery USB drive . . . 32 General guidelines. . . . . . . . . . . . . . 63 Passwords. . . . . . . . . . . . . . . . . 33 Disabling the built-in battery . . . . . . . . . . 64 Power-on password . . . . . . . . . . . 33 1010 Removable battery . . . . . . . . . . . 64 Hard disk password . . . . . . . . . . . 33 1020 Nano-SIM card. . . . . . . . . . . . . 65 © Copyright Lenovo 2018 i

1030 Base cover assembly . . . . . . . . . . 65 1190 Fingerprint-reader card . . . . . . . . . 88 1040 Memory module . . . . . . . . . . . . 68 1200 NFC module . . . . . . . . . . . . . . 90 1050 Internal storage drive . . . . . . . . . . 69 1210 LCD unit . . . . . . . . . . . . . . . 90 1060 Wireless-WAN card . . . . . . . . . . . 73 1220 Keyboard bezel assembly . . . . . . . . 92 1070 Wireless-LAN module . . . . . . . . . . 73 2010 LCD bezel sheet . . . . . . . . . . . . 93 1080 M.2 solid-state drive in the Wireless-WAN- 2020 LCD panel. . . . . . . . . . . . . . . 94 card slot. . . . . . . . . . . . . . . . . . 74 2030 LCD hinge assembly. . . . . . . . . . . 96 1090 Keyboard . . . . . . . . . . . . . . . 75 2040 Camera/microphone module . . . . . . . 98 1100 Coin-cell battery . . . . . . . . . . . . 77 2050 Camera and LED cable, and LCD cable . . . 99 1110 Speaker assembly . . . . . . . . . . . 78 2060 Wireless-LAN/WAN antenna assembly and 1120 Built-in battery . . . . . . . . . . . . . 79 LCD rear-cover assembly . . . . . . . . . . . 100 1130 Smart-card reader assembly . . . . . . . 80 Appendix A. Notices. . . . . . . . . . 103 1140 I/O bracket and RJ45 bracket . . . . . . . 81 1150 Thermal fan assembly . . . . . . . . . . 82 Electronic emissions notices. . . . . . . . . . 104 1160 Trackpad and trackpad cable . . . . . . . 84 Trademarks . . . . . . . . . . . . . . . . 104 1170 System board . . . . . . . . . . . . . 85 Appendix B. Abbreviation table . . . . 105 1180 Power-button card . . . . . . . . . . . 88 ii T480 Hardware Maintenance Manual

About this manual This manual contains service and reference information for the following ThinkPad® products. ThinkPad T480 Machine Type (MT) 20L5 and 20L6 Use this manual along with the advanced diagnostic tests to troubleshoot problems. Important: This manual is intended only for trained service technicians who are familiar with ThinkPad products. Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively. Before servicing a ThinkPad product, be sure to read all the information under Chapter 1 “Safety information” on page 1 and Chapter 2 “Important service information” on page 21. © Copyright Lenovo 2018 iii

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Chapter 1. Safety information This chapter presents following safety information that you need to be familiar with before you service a ThinkPad notebook computer. • “General safety” on page 1 • “Electrical safety” on page 1 • “Safety inspection guide” on page 2 • “Handling devices that are sensitive to electrostatic discharge” on page 3 • “Grounding requirements” on page 4 • “Safety notices (multilingual translations)” on page 4 General safety Follow these rules to ensure general safety: • Observe good housekeeping in the area of the machines during and after maintenance. • When lifting any heavy object: 1. Make sure that you can stand safely without slipping. 2. Distribute the weight of the object equally between your feet. 3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift. 4. Lift by standing or by pushing up with your leg muscles; this action removes the strain from the muscles in your back. Do not attempt to lift any object that weighs more than 16 kg (35 lb) or that you think is too heavy for you. • Do not perform any action that causes hazards to the customer, or that makes the equipment unsafe. • Before you start the machine, make sure that other service technicians and the customer's personnel are not in a hazardous position. • Place removed covers and other parts in a safe place, away from all personnel, while you are servicing the machine. • Keep your toolcase away from walk areas so that other people will not trip over it. • Do not wear loose clothing that can be trapped in the moving parts of a machine. Make sure that your sleeves are fastened or rolled up above your elbows. If your hair is long, fasten it. • Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconductive clip, about 8 centimeters (3 inches) from the end. • Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing. Attention: Metal objects are good electrical conductors. • Wear safety glasses when you are hammering, drilling, soldering, cutting wire, attaching springs, using solvents, or working in any other conditions that might be hazardous to your eyes. • After service, reinstall all safety shields, guards, labels, and ground wires. Replace any safety device that is worn or defective. • Reinstall all covers correctly before returning the machine to the customer. • Fan louvers on the machine help to prevent overheating of internal components. Do not obstruct fan louvers or cover them with labels or stickers. Electrical safety Observe the following rules when working on electrical equipment. Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical currents.Many customers have, near their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges. Do not use this type of mat to protect yourself from electrical shock. © Copyright Lenovo 2018 1

• Find the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical accident occurs, you can then operate the switch or unplug the power cord quickly. • Do not work alone under hazardous conditions or near equipment that has hazardous voltages. • Disconnect all power before: – Performing a mechanical inspection – Working near power supplies – Removing or installing main units • Before you start to work on the machine, unplug the power cord. If you cannot unplug it, ask the customer to power-off the wall box that supplies power to the machine, and to lock the wall box in the off position. • If you need to work on a machine that has exposed electrical circuits, observe the following precautions: – Ensure that another person, familiar with the power-off controls, is near you. Attention: Another person must be there to switch off the power, if necessary. – Use only one hand when working with powered-on electrical equipment; keep the other hand in your pocket or behind your back. Attention: An electrical shock can occur only when there is a complete circuit. By observing the above rule, you may prevent a current from passing through your body. – When using testers, set the controls correctly and use the approved probe leads and accessories for that tester. – Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as metal floor strips and machine frames. Observe the special safety precautions when you work with very high voltages; Instructions for these precautions are in the safety sections of maintenance information. Use extreme care when measuring high voltages. • Regularly inspect and maintain your electrical hand tools for safe operational condition. • Do not use worn or broken tools and testers. • Never assume that power has been disconnected from a circuit. First, check that it has been powered off. • Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors, nongrounded power extension cables, power surges, and missing safety grounds. • Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is conductive; such touching can cause personal injury and machine damage. • Do not service the following parts with the power on when they are removed from their normal operating places in a machine: – Power supply units – Pumps – Blowers and fans – Motor generators – Similar units as listed above This practice ensures correct grounding of the units. • If an electrical accident occurs: – Use caution; do not become a victim yourself. – Switch off power. – Send another person to get medical aid. Safety inspection guide The purpose of this inspection guide is to assist you in identifying potentially unsafe conditions. As each machine was designed and built, required safety items were installed to protect users and service technicians from injury. This guide addresses only those items. You should use good judgment to identify potential safety hazards due to attachment of non-ThinkPad features or options not covered by this inspection guide. If any unsafe conditions are present, you must determine how serious the apparent hazard could be and whether you can continue without first correcting the problem. 2 T480 Hardware Maintenance Manual

Consider these conditions and the safety hazards they present: • Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal electrical shock) • Explosive hazards, such as a damaged cathode ray tube (CRT) face or a bulging capacitor • Mechanical hazards, such as loose or missing hardware To determine whether there are any potentially unsafe conditions, use the following checklist at the beginning of every service task. Begin the checks with the power off, and the power cord disconnected. Checklist: 1. Check exterior covers for damage (loose, broken, or sharp edges). 2. Power off the computer. Disconnect the power cord. 3. Check the power cord for: a. A third-wire ground connector in good condition. Use a meter to measure third-wire ground continuity for 0.1 ohm or less between the external ground pin and the frame ground. b. The power cord should be the authorized type specified for your computer. Go to: https:// support.lenovo.com/partslookup c. Insulation must not be frayed or worn. 4. Check for cracked or bulging batteries. 5. Remove the cover. 6. Check for any obvious non-ThinkPad alterations. Use good judgment as to the safety of any non- ThinkPad alterations. 7. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or other liquids, or signs of fire or smoke damage. 8. Check for worn, frayed, or pinched cables. 9. Check that the power-supply cover fasteners (screws or rivets) have not been removed or tampered with. Handling devices that are sensitive to electrostatic discharge Any computer part containing transistors or integrated circuits (ICs) should be considered sensitive to electrostatic discharge (ESD). ESD damage can occur when there is a difference in charge between objects. Protect against ESD damage by equalizing the charge so that the machine, the part, the work mat, and the person handling the part are all at the same charge. Notes: 1. Use product-specific ESD procedures when they exceed the requirements noted here. 2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully effective. When handling ESD-sensitive parts: • Keep the parts in protective packages until they are inserted into the product. • Avoid contact with other people. • Wear a grounded wrist strap against your skin to eliminate static on your body. • Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even when you are wearing a wrist strap. • Use a grounded work mat to provide a static-free work surface. The mat is especially useful when handling ESD-sensitive devices. • Select a grounding system, such as those listed below, to provide protection that meets the specific service requirement. Note: The use of a grounding system to guard against ESD damage is desirable but not necessary. – Attach the ESD ground clip to any frame ground, ground braid, or green-wire ground. Chapter 1. Safety information 3

– When working on a double-insulated or battery-operated system, use an ESD common ground or reference point. You can use coax or connector-outside shells on these systems. – Use the round ground prong of the ac plug on ac-operated computers. Grounding requirements Electrical grounding of the computer is required for operator safety and correct system function. Proper grounding of the electrical outlet can be verified by a certified electrician. Safety notices (multilingual translations) The safety notices in this section are provided in the following languages: • English • Arabic • Brazilian Portuguese • French • German • Hebrew • Japanese • Korean • Spanish • Traditional Chinese DANGER DANGER DANGER 4 T480 Hardware Maintenance Manual

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Chapter 2. Important service information This chapter introduces following important service information that applies to all machine types supported by this manual: • “Strategy for replacing FRUs” on page 21 – “Strategy for replacing a hard disk drive or a solid-state drive” on page 21 – “Important notice for replacing a system board” on page 22 – “How to use error message” on page 22 • “Strategy for replacing FRUs for CTO, special-bid, and standard models” on page 22 – “Product definition” on page 22 – “FRU identification” on page 22 Important: • Advise customers to contact the Lenovo® Customer Support Center if they need any assistance in obtaining or installing any software fixes, drivers, and Unified Extensible Firmware Interface basic input/ output system (UEFI BIOS) downloads. Telephone numbers for Lenovo Support are available at: https:// pcsupport.lenovo.com/supportphonelist • System Disassembly/Reassembly videos that show the FRU removals or replacements for the Lenovo authorized service technicians are available in the following support site: https://www.lenovoservicetraining.com/ion/ Strategy for replacing FRUs Before replacing parts: Ensure that all software fixes, drivers, and UEFI BIOS downloads are installed before replacing any FRUs listed in this manual. After a system board is replaced, ensure that the latest UEFI BIOS is loaded to the system board before completing the service action. To download software fixes, drivers, and UEFI BIOS, go to https://support.lenovo.com and follow the instructions on the screen. Use the following strategy to prevent unnecessary expense for replacing and servicing FRUs: • If you are instructed to replace a FRU but the replacement does not correct the problem, reinstall the original FRU before you continue. • Some computers have both a processor board and a system board. If you are instructed to replace either the processor board or the system board, and replacing one of them does not correct the problem, reinstall that board, and then replace the other one. • If an adapter or a device consists of more than one FRU, any of the FRUs might be the cause of the error. Before replacing the adapter or device, remove the FRUs, one by one, to see if the symptoms change. Replace only the FRU that changed the symptoms. Strategy for replacing a hard disk drive or a solid-state drive Always try to run a low-level format before replacing a hard disk drive or a solid-state drive. This will cause all customer data on the drive to be lost. Be sure that the customer has a current backup of the data before doing this task. Attention: The drive startup sequence in the computer you are servicing may have been changed. Be extremely careful during write operations such as copying, saving, or formatting. If you select an incorrect drive, data or programs can be overwritten. © Copyright Lenovo 2018 21

Important notice for replacing a system board Some components mounted on a system board are very sensitive. Improper handling of a system board can cause damage to those components, and may cause a system malfunction. Attention: When handling a system board: • Do not drop a system board or apply any excessive force to it. • Avoid rough handling of any kind. • Avoid bending a system board and hard pushing to prevent cracking at each ball-grid-array (BGA) chipset. How to use error message Use the error codes displayed on the screen to diagnose failures. If more than one error code is displayed, begin the diagnosis with the first error code. Whatever causes the first error code may also cause false error codes. If no error code is displayed, see whether the error symptom is listed in the Symptom-to-FRU Index for the computer you are servicing. Strategy for replacing FRUs for CTO, special-bid, and standard models This topic provides information about the model types and FRU identification. Product definition This topic introduces different model types and how to identify each type. Dynamic configure-to-order (CTO) model This model provides the ability for a customer to configure a Lenovo solution from a Web Site, and have this configuration sent to fulfillment, where it is built and shipped directly to the customer. The machine label and eSupport will load these products as the 4-character MT, 4-character model, and 2-character country code. The model is “CTO1” and the default country code is “WW” (example: 20AACTO1WW). Special-bid model This is a unique configuration that has been negotiated between Lenovo and the customer. A unique machine type model (MTM) consists of a 4-character MT, a 4-character model, and a numeric 2-character country code is provided to the customer to place orders (example: 20AA000955). The country code assigned is numeric and does not designate a specific country or region. The custom model factsheet for the MTM indicates which country the special bid MTM is set up for. Special-bid offering is not generally announced. Standard model Standard models (fixed configuration) are announced and offered to all customers. The MTM portion of the machine label consists of a 4-character MT, a 4-character model, and an alphabetic 2-character country code. The country code assigned is alphabetic and represents a designated country or region (example: 20AA0009UK). FRU identification Use Lenovo eSupport to identify major FRUs, FRU part numbers, and FRU descriptions for a product at an MT - serial number level. Examples of major FRUs are hard disk drive, system board, liquid crystal display (LCD), and memory module. To identify the major FRUs for a product, do the following: 1. Go to https://support.lenovo.com. 22 T480 Hardware Maintenance Manual

2. Click Warranty & Services. 3. Click Check Warranty Status. 4. On the Warranty Status Lookup page, click Parts Lookup. 5. Type your machine type and serial number, and then click Submit. eSupport also can be used to view the general FRU list for a product. To get the general FRU list for a product, do the following: 1. Go to https://support.lenovo.com. 2. Click Parts & Accessories. 3. Follow the instructions on the screen to select product. 4. Click Products and Parts Detail. 5. On the PRODUCT AND PARTS DETAIL page, click the Parts Detail tab to view the FRU list. Note: The FRU list is a general list of components and does not contain specific model information. Chapter 2. Important service information 23

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Chapter 3. General checkout This chapter introduces following information: • “What to do first” on page 25 • “Checkout guide” on page 26 – “Diagnosing problems” on page 26 – “Quick test programs” on page 27 – “UEFI diagnostic program” on page 27 – “Bootable diagnostic programs” on page 27 • “Power system checkout” on page 28 Before you go to the checkout guide, be sure to read the following important notes. Important notes: • Only certified trained personnel should service the computer. • Before replacing any FRU, read the entire page on removing and replacing FRUs. • When you replace FRUs, it is recommended use new nylon-coated screws. • Be extremely careful during such write operations as copying, saving, or formatting. The sequence of the drives in the computer that you are servicing might have been altered. If you select an incorrect drive, data or programs might be overwritten. • Replace a FRU only with another FRU of the correct model. When you replace a FRU, ensure that the model of the machine and the FRU part number are correct by referring to the web site: https:// support.lenovo.com/partslookup • A FRU should not be replaced because of a single, unreproducible failure. Single failures can occur for a variety of reasons that have nothing to do with a hardware defect, such as cosmic radiation, electrostatic discharge, or software errors. Consider replacing a FRU only when a problem recurs. If you suspect that a FRU is defective, clear the error log and run the test again. If the error does not recur, do not replace the FRU. • Be careful not to replace a nondefective FRU. What to do first When you return a FRU, you must include the following information in the parts exchange form or parts return form that you attach to it: 1. Name and phone number of service technician 2. Date of service 3. Date on which the machine failed 4. Date of purchase 5. Failure symptoms, error codes appearing on the display, and beep symptoms 6. Procedure index and page number in which the failing FRU was detected 7. Failing FRU name and part number 8. Machine type, model number, and serial number 9. Customer's name and address Note: During the warranty period, the customer may be responsible for repair costs if the computer damage was caused by misuse, accident, modification, unsuitable physical or operating environment, or improper maintenance by the customer. Following is a list of some common items that are not covered under warranty and some symptoms that might indicate that the system was subjected to stress beyond normal use. © Copyright Lenovo 2018 25

Before checking problems with the computer, determine whether the damage is covered under the warranty by referring to the following list: The following are not covered under warranty: • LCD panel cracked from the application of excessive force or from being dropped • Scratched (cosmetic) parts • Distortion, deformation, or discoloration of the cosmetic parts • Plastic parts, latches, pins, or connectors that have been cracked or broken by excessive force • Damage caused by liquid spilled into the system • Damage caused by the improper insertion of a personal-computer card (PC card) or the installation of an incompatible card • Improper disc insertion or use of an external optical drive • Fuses blown by attachment of a nonsupported device • Forgotten computer password (making the computer unusable) • Sticky keys caused by spilling a liquid onto the keyboard • Use of an incorrect ac power adapter on laptop products The following symptoms might indicate damage caused by nonwarranted activities: • Missing parts might be a symptom of unauthorized service or modification. • Check for obvious damage to a hard disk drive. If the spindle of a hard disk drive becomes noisy, the hard disk drive might have been dropped or subject to excessive force. Checkout guide Use the following procedures as a guide in identifying and correcting problems with the ThinkPad notebook computers. Note: The diagnostic tests are intended to test only ThinkPad products. The use of non-ThinkPad products, prototype cards, or modified options can lead to false indications of errors and invalid system responses. 1. Identify the failing symptoms in as much detail as possible. 2. Verify the symptoms. Try to re-create the failure by running the diagnostic test or by repeating the operation. Diagnosing problems Many computer problems can be solved without outside assistance. If you experience a problem with your computer, the first place to start is the troubleshooting information in your computer documentation. If you suspect a software problem, see the documentation, including readme files and help information systems, that come with the operating system or program. ThinkPad notebook computers come with a set of diagnostic programs that you can use to help you identify hardware problems. Diagnosing problems with Lenovo Companion on the Windows 10 operating system Note: If you are unable to isolate and repair the problem yourself after running Lenovo Companion, save and print the log files created by the program. You need the log files when you speak to a Lenovo technical support representative. Lenovo Companion supports the hardware scan function. It combines diagnostic tests, system information collection, security status, and support information, along with hints and tips for optimal system performance. The troubleshooting information or the diagnostic programs might tell you that you need additional or updated device drivers or other software. You can get the latest technical information and download device drivers and updates from the Lenovo Support Web site at: 26 T480 Hardware Maintenance Manual

https://support.lenovo.com For additional information, see the Lenovo Companion help system. Quick test programs Lenovo provides quick test programs to troubleshoot and resolve computer problems. To download and install a quick test program, go to https://www.lenovo.com/diags, and follow the instructions on the Web site. To run a test using quick test program, do the following: 1. Go to the C:\SWTOOLS\ldiag directory. 2. Double-click the lsc_lite.exe file. 3. When the User Account Control window opens, click Yes. 4. Select the device class to be tested. 5. Select the devices to be tested. 6. Select the test to be performed. 7. Follow the instructions on the screen to start the test. When a problem is detected, information messages are displayed. Refer to the messages to troubleshoot the problem. UEFI diagnostic program A UEFI diagnostic program is preinstalled on the computer. It enables you to test memory modules and internal storage devices, view system information, and check and recover bad sectors on internal storage devices. To run the UEFI diagnostic program, do the following: 1. Turn on the computer. If the computer cannot be turned on, go to “Power system checkout” on page 28, and check the power sources. If an error code is displayed, go to “Symptom-to-FRU index” on page 35 for error code descriptions and troubleshooting hints. 2. When the logo screen is displayed, repeatedly press and release the F10 key. The main screen of the UEFI diagnostic program is displayed. 3. Follow the instructions on the screen to use the diagnostic program. The options on the main screen are as follows: Table 1. Items on the main screen of the UEFI diagnostic program Tests Tools • Quick Memory Test • System Information • Quick Storage Device Test • Generate configuration file • LCD test • Execute from configuration file • PCI-e test • Recover Bad Sectors Tool* • Exit Application * Recover Bad Sectors Tool is only available on computers that have hard disk drives installed. Bootable diagnostic programs If the computer you are servicing is not installed with the UEFI diagnostic program, you can download a bootable diagnostic program from the Lenovo Support Web site. The bootable diagnostic programs enable Chapter 3. General checkout 27

you to test computer memory and internal storage devices, view system information, and check and recover the internal storage devices. To use the bootable diagnostic programs, you can create a bootable diagnostic medium on a Universal Serial Bus (USB) device or CD. To create a bootable diagnostic medium, do the following: 1. Go to https://www.lenovo.com/diags. 2. Click Lenovo Bootable Diagnostics. 3. Follow the instructions on the Web site to create a bootable diagnostic medium on a USB device or CD. To use the diagnostic medium you have created, do one of the following: • If you have created the bootable diagnostic medium on a USB device, do the following: 1. Attach the USB device to the computer. 2. Turn on the computer. If the computer cannot be turned on, go to “Power system checkout” on page 28, and check the power sources. If an error code is displayed, go to “Symptom-to-FRU index” on page 35for error code descriptions and troubleshooting hints. 3. When the logo screen is displayed, repeatedly press and release the F12 key. When the Boot Menu window opens, release the F12 key. 4. Use the arrow keys to select USB HDD and then press Enter. The diagnostic program will be launched automatically. 5. Follow the instructions on the screen to use the diagnostic program. • If you have created the bootable diagnostic medium on a CD, do the following: 1. Turn on the computer. If the computer cannot be turned on, go to “Power system checkout” on page 28, and check the power sources. If an error code is displayed, go to “Symptom-to-FRU index” on page 35for error code descriptions and troubleshooting hints. 2. Connect an external optical drive to the computer, and insert the CD into the optical drive. 3. Restart the computer. 4. When the logo screen is displayed, repeatedly press and release the F12 key. When the Boot Menu window opens, release the F12 key. 5. Use the arrow keys to select ATAPI CDx (x: 0, 1, ...) and then press Enter. The diagnostic program will be launched automatically. 6. Follow the instructions on the screen to use the diagnostic program. Power system checkout To verify if a battery or an ac power adapter is functional, do the following: 1. Turn off the computer. 2. Connect the ac power adapter. 3. Turn on the computer. If the computer can be turned on, it means that either the battery or the ac power adapter is functional. 4. Insert a straightened paper clip into the emergency-reset hole to reset the computer. If the computer is still powered on, it means that the ac power adapter is functional. 5. Turn off the computer. 6. Disconnect the ac power adapter and turn on the computer. If the computer can be turned on, it means that the battery is functional. If you suspect a power problem, see the appropriate one of the following power supply checkouts: • “Checking the ac power adapter” on page 29 • “Checking the removable battery and the operational charging” on page 29 • “Checking the coin-cell battery” on page 30 28 T480 Hardware Maintenance Manual

Checking the ac power adapter You are here because the computer fails only when the ac power adapter is used. • If the power problem occurs only when the docking station or the port replicator is used, replace the docking station or the port replicator. • If the system status indicator does not blink three times when an ac power source is connected, check the power cord of the ac power adapter for correct continuity and installation. • If the computer does not charge during operation, go to “Checking the removable battery and the operational charging” on page 29. Note: Noise from the ac power adapter does not always indicate a defect. Checking the USB-C type ac power adapter To check the USB-C type ac power adapter, do the following: 1. Connect the computer to a power outlet and turn on the computer. 2. Start Lenovo Companion program, and then click Hardware Settings ➙ Power. The ac power adapter information is displayed. Ensure that you use the USB-C type ac power adapter that is shipped with the computer to provide enough power to the computer. Otherwise, a message will be displayed, prompting you that the computer will not be charged or will be charged slowly. Checking the removable battery and the operational charging Checking the removable battery This system supports only batteries specially designed for this specific system and manufactured by Lenovo or an authorized builder. The system does not support unauthorized batteries or batteries designed for other systems. If an unauthorized battery or a battery designed for another systems is installed, the system will not charge. Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and provides no warranties for failures or damage arising out of their use. Move your pointer to the battery-status icon in the Windows® notification area to check the battery status. The battery-status icon displays the percentage of battery power remaining and how long you can use your computer before you must charge the battery. Note: If the removable battery becomes hot, it may not be able to charge. Remove it from the computer and leave it at room temperature for a while. After it cools down, reinstall and recharge it. To check the removable battery, do the following: 1. Turn off the computer. 2. Remove the removable battery and measure the voltage between battery terminals 1 (+) and 7 (-). See the following figure: Chapter 3. General checkout 29

Terminal Voltage (V dc) 1, 2 + 0 to + 12.6 6, 7 Ground (-) 7(-) 5 6(-) 3 4 2(+) 1(+) 3. If the voltage is less than +11.0 V dc, the removable battery has been discharged. If the voltage is still less than +11.0 V dc after recharging, replace the removable battery. 4. If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 5 and 7. The resistance must be 4 to 30 K Ω. If the resistance is not correct, replace the removable battery. If the resistance is correct, replace the system board. Checking the operational charging To check whether the battery charges properly during operation, do the following: 1. Discharge the battery until the remained battery power is less than 50%. 2. Connect the computer to ac power to charge the battery. If the battery status icon in the Windows notification area indicates that the battery is not charging, remove the battery and let it return to room temperature. 3. Reinstall the battery. If the battery is still not charging, replace the battery. 4. Check the battery status icon again. If the same error still exists, replace the system board. Checking the coin-cell battery To check the coin-cell battery, do the following: 1. Disable the built-in battery. See “Disabling the built-in battery” on page 64. 2. Remove the coin-cell battery. See “1100 Coin-cell battery” on page 77. 3. Measure the voltage of the coin-cell battery. See the following illustration. Wire Voltage (V dc) Red +2.5 to +3.2 Black Ground • If the voltage is correct, replace the system board. • If the voltage is not correct, replace the coin-cell battery. • If the coin-cell battery discharges quickly after replacement, replace the system board. 30 T480 Hardware Maintenance Manual

Chapter 4. Related service information This chapter presents following information: • “Passwords” on page 33 • “Power management” on page 35 • “Symptom-to-FRU index” on page 35 Service Web site: When the latest maintenance diskette and the system program service diskette become available, they will be posted on https://support.lenovo.com Recovery information for the Windows 10 operating system The Windows recovery programs enable you to reset your computer or use advanced startup options. It is recommended that you create a recovery USB drive as early as possible. Store the recovery USB drive as a backup or replacement for the Windows recovery programs. For more information, see “Creating and using a recovery USB drive” on page 32. Resetting your computer If your computer does not perform well, you might consider resetting your computer. In the resetting process, you can choose to keep your files or remove them, and then reinstall the Windows operating system. To reset your computer, do the following: Note: The graphical user interface (GUI) items of the operating system might change without notice. 1. Open the Start menu, and then click Settings ➙ Update & Security ➙ Recovery. 2. In the Reset this PC section, click Get started. 3. Follow the instructions on the screen to reset your computer. Using advanced startup options The advanced startup options enable you to do the following: • Change the firmware settings of the computer • Change the startup settings of the Windows operating system • Start the computer from an external device • Restore the Windows operating system from a system image To use advanced startup options, do the following: Note: The GUI items of the operating system might change without notice. 1. Open the Start menu, and then click Settings ➙ Update & security ➙ Recovery. 2. In the Advanced startup section, click Restart now ➙ Troubleshoot ➙ Advanced options. 3. Select a startup option you want, and then follow the instructions on the screen. © Copyright Lenovo 2018 31

Recovering your operating system if Windows 10 fails to start The Windows recovery environment on your computer operates independently from the Windows 10 operating system. It enables you to recover or repair the operating system even if the Windows 10 operating system fails to start. After two consecutive failed boot attempts, the Windows recovery environment starts automatically. Then you can choose repair and recovery options by following the on-screen instructions. Note: Ensure that your computer is connected to ac power during the recovery process. Creating and using a recovery USB drive You can create a recovery USB drive as a backup for the Windows recovery programs. With the recovery USB drive, you can troubleshoot and fix the problems even if the preinstalled Windows recovery programs are damaged. It is recommended that you create a recovery USB drive as early as possible. If you did not create a recovery USB drive as a precautionary measure, you can contact Lenovo Customer Support Center and purchase one from Lenovo. For a list of the Lenovo Support phone numbers for your country or region, go to: https://pcsupport.lenovo.com/supportphonelist Creating a recovery USB drive To create a recovery USB drive, you need a USB drive with at least 16 GB of storage capacity. The actual USB capacity that is required depends on the size of the recovery image. Attention: The creation process will delete anything stored on the USB drive. To avoid data loss, make a backup copy of all the data that you want to keep. To create a recovery USB drive, do the following: Note: Ensure that your computer is connected to ac power during the following process. 1. Connect a proper USB drive (at least 16 GB of storage) to the computer. 2. Type recovery in the search box on the taskbar. Then click Create a recovery drive. 3. Click Yes in the User Account Control window to allow the Recovery Media Creator program to start. 4. In the Recovery Drive window, follow the instructions on the screen to create a recovery USB drive. Using the recovery USB drive If you still cannot start your computer, use the recovery USB drive to recover your computer. To use a recovery USB drive, do the following: Note: Ensure that your computer is connected to ac power during the following process. 1. Connect the recovery USB drive to the computer. 2. Turn on or restart the computer. Before the Windows operating system starts, repeatedly press F12. The Boot Menu window opens. 3. Select the recovery USB drive as the boot device. 4. Select a preferred keyboard layout. 5. Click Troubleshoot to display optional recovery solutions. 6. Select a corresponding recovery solution according to your situation. Then follow the instructions on the screen to complete the process. 32 T480 Hardware Maintenance Manual

Passwords As many as three passwords may be needed for any ThinkPad notebook computer: the power-on password, the hard disk password, and the supervisor password. If any of these passwords has been set, a prompt for it will be displayed on the screen whenever the computer is turned on. The computer does not start until the password is entered. Note: If only a supervisor password is set, the password prompt will not be displayed when the operating system is started. Power-on password A power-on password protects the system from being powered on by an unauthorized person. The password must be entered before an operating system can be started. For instructions on how to remove the power-on password, see“How to remove the power-on password” on page 34. Hard disk password There are two kinds of hard disk passwords: • User hard disk password - for the user • Master hard disk password - for the system administrator, who can use it to get access to the hard disk even if the user has changed the user hard disk password Note: There are two modes for the hard disk password: User only and Master + User. The Master + User mode requires two hard disk passwords; the system administrator enters both in the same operation. The system administrator then provides the user hard disk password to the system user. Attention: If the user hard disk password has been forgotten, check whether a master hard disk password has been set. If it has, it can be used for access to the hard disk drive. If no master hard disk password is available, neither Lenovo nor Lenovo authorized service technicians provide any services to reset either the user or the master hard disk password, or to recover data from the hard disk drive. The hard disk drive can be replaced for a scheduled fee. For how to remove the hard disk password, see “How to remove the hard disk password” on page 34. Supervisor password The supervisor password protects the system information stored in the ThinkPad Setup program. It provides the following security features: • If only a supervisor password is set, a password prompt is displayed when you try to start the ThinkPad Setup program. Unauthorized users cannot change most of the system configuration options in the ThinkPad Setup program without the password. • The system administrator can use the supervisor password to access a computer even if the user of that computer has set a power-on password. The supervisor password overrides the power-on password. • The system administrator can set the same supervisor password on many ThinkPad notebook computers to make administration easier. Attention: If the supervisor password has been forgotten and cannot be made available to the service technician, there is no service procedure to reset the password. The system board must be replaced for a scheduled fee. Chapter 4. Related service information 33

How to remove the power-on password To remove a power-on password, do the following: If no supervisor password has been set, do the following to remove the power-on password: 1. Turn off the computer. 2. Remove the removable battery. For instructions on how to remove the removable battery, see “1010 Removable battery” on page 64. 3. Remove the built-in battery. For instructions on how to remove the built-in battery, see “1120 Built-in battery” on page 79. 4. Remove the coin-cell battery. For instructions on how to remove the coin-cell battery, see “1100 Coin- cell battery” on page 77. Wait for a few seconds. 5. Reinstall the coin-cell battery. For instructions on how to install the coin-cell battery, see “1100 Coin-cell battery” on page 77. 6. Reinstall the built-in battery. For instructions on how to reinstall the built-in battery, see “1120 Built-in battery” on page 79. 7. Reinstall the removable battery. For instructions on how to install the removable battery, see “1010 Removable battery” on page 64. 8. Turn on the computer and wait until the power-on self-test (POST) ends. After the POST ends, the password prompt does not appear. The power-on password has been removed. If a supervisor password has been set and is known to the service technician, do the following to remove the power-on password: 1. Turn on the computer. 2. When the logo screen comes up, immediately press F1. 3. Type the supervisor password to enter the ThinkPad Setup program. 4. Select Security. 5. Select Password. 6. Select Power-On Password. 7. Type the current supervisor password in the Enter Current Password field. Then leave the Enter New Password field blank, and press Enter twice. 8. In the Changes have been saved window, press Enter. 9. Press F10 to save changes and exit the ThinkPad Setup program. How to remove the hard disk password Attention: If User only mode is selected and the user hard disk password has been forgotten and cannot be made available to the service technician, neither Lenovo nor Lenovo authorized service technicians provide any services to reset the user hard disk passwords or to recover data from the hard disk drive. To put the system back to operational status, the only Lenovo and Lenovo-authorized service solution would be to replace the hard disk drive or solid-state drive with a scheduled fee. To remove a user hard disk password that has been forgotten, when the supervisor password and master hard disk password are known, do the following: 1. Turn on the computer. 2. When the logo screen comes up, immediately press F1 to enter the ThinkPad Setup program. 3. Select Security. 4. Select Password. 5. Select Hard disk x password, where x is the letter of the hard disk drive. A pop-up window opens. 6. Select Master hard disk password. 34 T480 Hardware Maintenance Manual

7. Type the current master hard disk password in the Enter Current Password field. Then leave the Enter New Password field blank, and press Enter twice. 8. Press F10. 9. Press F10 to save changes and exit the ThinkPad Setup program. The user hard disk password and the master hard disk password have been removed. Power management To reduce power consumption, the computer has three power management modes: screen blank, sleep, and hibernation. Sleep mode When the computer enters sleep mode, the following events occur in addition to what occurs in screen blank mode: • The LCD is powered off. • The hard disk drive or solid-state drive is powered off. • The microprocessor stops. To put your computer into sleep mode, press Fn+4 or open the Start menu, click Power, and then click Sleep. To return to normal operation, press the Fn key only. In certain circumstances, the computer goes into sleep mode automatically: • After a period of inactivity specified in power plan settings • When the battery power is low Hibernation mode In hibernation mode, the following occurs: • The system status, random access memory (RAM), video random access memory (VRAM), and setup data are stored on the hard disk drive or solid-state drive. • The system is powered off. Note: If the computer enters the hibernation mode while it is docked to the docking station or the port replicator, do not undock it before resuming normal operation. If you do undock it and then try to resume normal operation, you will get an error message, and you will have to restart the system. If you have defined one of the following actions as the event that causes the system to go into hibernation mode, perform that action. • Closing the lid. • Pressing the power button. Also, the computer goes into hibernation mode automatically after a period of inactivity specified in power plan settings. When the power is turned on, the computer returns from hibernation mode and resumes operation. The hibernation file in the boot record on the hard disk drive or solid-state drive is read, and system status is restored from the hard disk drive or solid-state drive. Symptom-to-FRU index This section contains following information: • “Numeric error codes” on page 36 Chapter 4. Related service information 35

• “Error messages” on page 37 • “Beep errors” on page 38 • “No-beep symptoms” on page 40 • “LCD-related symptoms” on page 40 • “Intermittent problems” on page 41 • “Undetermined problems” on page 41 The symptom-to-FRU index in this section lists symptoms and errors and their possible causes. The most likely cause is listed first, in boldface type. Note: Do the FRU replacement or other actions in the sequence shown in the column headed “FRU or action, in sequence.” If replacing a FRU does not solve the problem, put the original part back in the computer. Do not replace a nondefective FRU. This index can also help you determine, during regular servicing, what FRUs are likely to need to be replaced next. A numeric error is displayed for each error detected in POST or system operation. In the displays, n can be any number. If no numeric code is displayed, check the narrative descriptions of symptoms. If the symptom is not described there, go to “Intermittent problems” on page 41. Note: For a device not supported by diagnostic codes in the ThinkPad notebook computers, see the manual for that device. Numeric error codes Table 2. Numeric error codes Symptom or error FRU or action, in sequence 0177 Replace the system board. Bad SVP data, stop POST task—The checksum of the supervisor password in the EEPROM is not correct. 0183 1. Run the ThinkPad Setup program. The settings Bad CRC of Security Settings in EFI Variable. Enter the will be corrected automatically. Then save the ThinkPad Setup program. – The checksum of the Security current settings by pressing F10. settings in the EFI Variable is not correct. 2. Replace the system board. 0187 Replace the system board. EAIA data access error—The access to EEPROM is failed. 0188 Replace the system board. Invalid RFID Serialization Information Area. 0189 Replace the system board. Invalid RFID configuration information area—The EEPROM checksum is not correct. 0190 1. Charge the battery pack. Critical low-battery error 2. Replace the battery pack. 0191 1. Run the ThinkPad Setup program, and then save System Security—Invalid Remote Change requested. current setting by pressing F10. 2. Replace the system board. 0199 1. Run the ThinkPad Setup program. The retry count System Security— Security password retry count will be reset. Then save the current settings by exceeded. pressing F10. 2. Replace the system board. 36 T480 Hardware Maintenance Manual

Table 2. Numeric error codes (continued) Symptom or error FRU or action, in sequence 0270 Have the computer serviced. Real Time Clock Error— System Real Time Clock is not functional. 0271 Set the date and time, using ThinkPad Setup. Check Date and Time settings— Neither the date nor the time is set in the computer. 1802 1. Remove network card. Unauthorized network card is plugged in—Turn off and 2. Replace the system board. remove the network card. 1820 Remove all but the reader that you set up for the More than one external fingerprint reader is attached. authentication. Power off and remove all but the reader that you set up within your main operating system. 2100 1. Reseat the solid-state drive. Detection error on Storage Device (Main HDD) 2. Replace the solid-state drive. 3. Replace the system board. 2101 1. Reseat the M.2 solid-state drive. Detection error on Storage Device (M.2) 2. Replace the M.2 solid-state drive. 3. Replace the system board. 2102 1. Reseat the hard disk drive or the solid-state drive. Detection error on Storage Device (Main HDD) 2. Replace the hard disk drive or the solid-state drive. 3. Replace the system board. 2110 1. Reseat the hard disk drive. Read error on Storage Device (Main HDD) 2. Replace the hard disk drive. 3. Replace the system board. 2111 1. Reseat the M.2 solid-state drive. Read error on Storage Device (Main HDD) 2. Replace the M.2 solid-state drive. 3. Replace the system board. 2112 1. Reseat the hard disk drive or the solid-state drive. Read error on Storage Device (Main HDD) 2. Replace the hard disk drive or the solid-state drive. 3. Replace the system board. 2200 Replace the system board. Machine Type and Serial Number are invalid. 2201 Replace the system board. Machine UUID is invalid Error messages Table 3. Error messages Symptom or error FRU or action, in sequence Fan error. 1. Replace the thermal fan assembly. 2. Apply thermal grease. 3. Replace the system board. Thermal sensing error. Replace the system board. Chapter 4. Related service information 37

Table 3. Error messages (continued) Symptom or error FRU or action, in sequence The battery installed is not supported by this system and Replace the battery pack. will not charge. Please replace the battery with the correct Lenovo battery for this system. Press the ESC key to continue. This system does not support batteries that are not Replace the battery pack. genuine Lenovo made or authorized. The system will continue to boot, but may not charge unauthorized batteries. Press the ESC key to continue. Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and provides no warranties for failures or damage arising out of their use. Bottom cover tamper detection error System board The non-volatile system UEFI variable storage is nearly Note: This error indicates that the operating system or full. programs cannot create, modify, or delete data in the non-volatile system UEFI variable storage due to insufficient storage space after POST. The non-volatile system UEFI variable storage is used by the UEFI BIOS and by the operating system or programs. This error occurs when the operating system or programs store large amounts of data in the variable storage. All data needed for POST, such as BIOS setup settings, chipset, or platform configuration data, are stored in a separate UEFI variable storage. Press F1 after the error message is displayed to enter ThinkPad Setup. A dialog asks the user for confirmation to clean up the storage. If the user selects “Yes”, all data that were created by the operating system or programs will be deleted except global variables defined by the Unified Extensible Firmware Interface Specification. If the user selects “No”, all data will be kept, but the operating system or programs will not be able to create, modify, or delete data in the storage. If this error happens at a service center, Lenovo authorized service personnel will clean up the non-volatile system UEFI variable storage using the preceding solution. Beep errors Lenovo SmartBeep technology enables you to decode beep errors with your smartphone when a black screen occurs with beeps from your computer. To decode the beep error with Lenovo SmartBeep technology, do the following: 1. Go to https://support.lenovo.com/smartbeep or scan the following QR Code. 38 T480 Hardware Maintenance Manual

2. Download the proper diagnostic app and install it on your smartphone. 3. Run the diagnostic app and place the smartphone near the computer. 4. Press the Fn key on your computer to emit the beep again. The diagnostic app decodes the beep error and shows possible solutions on the smartphone. The following section describes some beep errors and the corresponding solutions. Note: Do not attempt to service a product yourself unless instructed to do so by the Customer Support Center or product documentation. Only use a Lenovo-authorized service provider to repair your product. Error codes Solutions 0001: Reset error (platform reset not de-asserted) 1. Remove all power resources (the ac power adapter, removable battery, and coin-cell battery). If your computer has a built-in battery, reset the computer by inserting a straightened paper clip into the emergency-reset hole. Wait for one minute. Then reconnect all power resources. 2. Replace the system board (service provider only). 0002: Internal bus error Replace the system board (service provider only). 0281: General embedded controller error Replace the system board (service provider only). 0282: Memory module error 1. Reinstall or replace the memory module. 2. Replace the system board (service provider only). 0283: PCI resource error 1. Remove PCIe devices (the M.2 card, PCIe card, and so on) (service provider only). 2. Replace the system board (service provider only). 0284: TCG-compliant functionality-related error (might be Replace the system board (service provider only). the BIOS code validation failure) 0285: TCG-compliant functionality-related error (might be Replace the system board (service provider only). the TPM initialization failure) 0286: Integrated graphics error Replace the system board (service provider only). Chapter 4. Related service information 39

Error codes Solutions 0287: Discrete graphics error 1. Reinstall or replace the discrete graphics card (service provider only). 2. Replace the system board (service provider only). 0288: Computer display error 1. Reconnect the display cable on both the system board side and the computer display side (service provider only). 2. Replace the system board (service provider only). No-beep symptoms Table 4. No-beep symptoms Symptom or error FRU or action, in sequence No beep, power-on indicator on, LCD blank, and no 1. Ensure that every connector is connected tightly POST. and correctly. 2. Reseat memory module. 3. Replace the system board. No beep, power-on indicator on, and LCD blank during 1. Reseat memory module. POST. 2. Replace the system board. The power-on password prompt appears. A power-on password or a supervisor password is set. Type the password and press Enter. The hard disk password prompt appears. A hard disk password is set. Type the password and press Enter. LCD-related symptoms Important: The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). The presence of a small number of dots that are missing, discolored, or always lighted is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns.If the LCD you are servicing has two or less visible defective pixels, it should not be considered faulty. However, if the LCD has three or more visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced. Notes: • This policy applies to all ThinkPad notebooks purchased on 1 January, 2008 or later. • Lenovo will not provide warranty replacement if the LCD is within specifications because we cannot guarantee that any replacement LCD will have zero pixel defects. • One pixel consists of R, G, B sub-pixels. Table 5. LCD-related symptoms Symptom or error FRU or action, in sequence No beep, power-on indicator on, and a blank LCD during Replace the system board. POST. • LCD backlight not working. 1. Reseat the LCD cable. • LCD too dark. 2. Replace the LCD unit. • LCD brightness cannot be adjusted. 3. Replace the system board. • LCD contrast cannot be adjusted. 40 T480 Hardware Maintenance Manual

Table 5. LCD-related symptoms (continued) Symptom or error FRU or action, in sequence • LCD screen unreadable. 1. See important note for “LCD-related symptoms.” • Characters missing pixels. 2. Reseat all LCD cable. • Screen abnormal. 3. Replace the LCD unit. • Wrong color displayed. 4. Replace the system board. Horizontal or vertical lines displayed on LCD. Replace the LCD unit. Intermittent problems Intermittent system hang problems can be due to a variety of causes that have nothing to do with a hardware defect, such as cosmic radiation, electrostatic discharge, or software errors. FRU replacement should be considered only when a problem recurs. When analyzing an intermittent problem, do the following: 1. Run the diagnostic test for the system board in loop mode at least 10 times. 2. If no error is detected, do not replace any FRUs. 3. If any error is detected, replace the FRU shown by the FRU code. Rerun the test to verify that no more errors exist. Undetermined problems If the diagnostic tests did not identify the adapter or device that has failed, if wrong devices are installed, or if the system simply is not operating, follow these procedures to isolate the failing FRU (do not isolate FRUs that have no defects). Verify that all attached devices are supported by the computer. Verify that the power supply being used at the time of the failure is operating correctly. See “Power system checkout” on page 28. 1. Turn off the computer. 2. Visually check each FRU for damage. Replace any damaged FRU. 3. Remove or disconnect all of the following devices: a. Non-ThinkPad devices b. Devices attached to the docking station or the port replicator c. Printer, mouse, and other external devices d. Battery e. Hard disk drive or solid-state drive f. External diskette drive or optical drive g. Memory module h. PC cards 4. Turn on the computer. 5. Determine whether the problem has been solved. 6. If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU. 7. If the problem remains, replace the following FRUs one at a time (do not replace a nondefective FRU): a. System board b. LCD unit Chapter 4. Related service information 41

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Chapter 5. Status indicators This topic provides information about locating and identifying the various status indicators on your computer. Note: Depending on the model, your computer might look different from the following illustrations. 1 Camera status indicator When this indicator is on, the camera is in use. © Copyright Lenovo 2018 43

2 8 System status indicators The indicator in the ThinkPad logo on the computer lid and the indicator in the power button show the system status of your computer. • Blinks for three times: The computer is initially connected to power. • On: The computer is on (in normal mode). • Off: The computer is off or in hibernation mode. • Blinks quickly: The computer is entering sleep or hibernation mode. • Blinks slowly: The computer is in sleep mode. 3 Fingerprint reader indicator This indicator shows the status of fingerprint reader. • 1 Off: The fingerprint reader is not ready for tapping. • 2 White: The fingerprint reader is ready for tapping. • 3 Amber, blinking: The fingerprint cannot be authenticated. 4 Caps Lock indicator When this indicator is on, you can type uppercase letters by directly pressing the letter keys. 5 Fn Lock indicator This indicator shows the status of Fn Lock function. For more information, see Chapter 6 “Using the special keys” on page 45. 6 Speaker-mute indicator When this indicator is on, the speakers are muted. 7 Microphone-mute indicator When this indicator is on, the microphones are muted. 9 ac power status indicator This indicator shows the ac power and charging status of the computer. • White: connected to ac power (battery power 90%–100%) • Amber: connected to ac power (battery power 0%–90%) • Off: not connected to ac power 44 T480 Hardware Maintenance Manual

Chapter 6. Using the special keys Your computer has several special keys to help you work more easily and effectively. 1 Windows logo key Press the Windows logo key to open the Start menu. For information about using the Windows logo key with other keys, see the help information system of the Windows operating system. 2 3 Fn key and function keys You can configure the Fn key and function keys in the Keyboard Properties window by doing the following: 1. Go to Control Panel, and then change the view of Control Panel from Category to Large icons or Small icons. 2. Click Lenovo - Keyboard Manager and the Keyboard Manager window is displayed. 3. Select the options of your preference. • + Switch the key function between the standard F1–F12 function and the special function printed as an icon on each key. When the Fn Lock indicator is off, you can use the default function. You can change the default function in the Keyboard Properties window. • Mute or unmute the speakers. When the speakers are muted, the indicator on the key is on. If you mute the sound and turn off your computer, the sound will remain muted when you turn on your computer. To turn on the sound, press or . • Decrease the speaker volume. • Increase the speaker volume. • Mute or unmute the microphones. When the microphones are muted, the indicator on the key is on. • Darken the computer display. • Brighten the computer display. • Manage external displays. • Enable or disable the built-in wireless features. • Open the Settings window. © Copyright Lenovo 2018 45

• Enable or disable the built-in Bluetooth features. • Open a keyboard setting page. • Invoke the function defined by yourself. If no function is defined, press this key to open the Cortana personal assistant. To define or change the function, do the following: 1. Open the Start menu and click the Lenovo Companion program. 2. Click Hardware Settings and then click the input icon . 3. Locate the Keyboard: User-defined Key section and follow the instructions on the screen to complete the setting. On the Input page, you can also define different functions for the key combinations with F12, such as Shift +F12, Alt+F12, or Ctrl+F12. Key combinations • + Open the Snipping Tool program. • Fn+B: The Break key • Fn+K: The ScrLK or Scroll Lock key • Fn+P: The Pause key • Fn+S: The SysRq key • Fn+Left Arrow key: The Home key • Fn+Right Arrow key: The End key • Fn+4: Put the computer into sleep mode. To wake up the computer, press the Fn key or the power button. • Fn+Spacebar: If your computer supports keyboard backlight, press Fn+Spacebar to switch between the different keyboard backlight status. 46 T480 Hardware Maintenance Manual

Chapter 7. Locations This chapter introduces the locations of the hardware components on your computer. Locating computer controls, connectors, and indicators This topic introduces the locations of the computer controls, connectors, and indicators. Note: * Available on some models. Front view © Copyright Lenovo 2018 47

1 Infrared camera * 2 Microphones 3 Conventional camera * 4 Conventional camera with ThinkShutter (len cover) * 5 Power button 6 Fingerprint reader * 7 TrackPoint buttons 8 Trackpad 9 TrackPoint® pointing stick 10 NFC mark* 11 Screen (multi-touch screen on some models) Left-side view 1 USB-C™ connector 2 USB-C connector (Thunderbolt™ 3 compatible) 3 Connector cover 4 Docking-station connector 5 Fan louvers 6 Smart-card slot * Right-side view 1 Audio connector 2 USB 3.1 connector Gen 1 3 HDMI™ connector 4 Always On USB 3.1 connector Gen 1 5 Ethernet connector 6 Media-card slot 7 Security-lock slot 48 T480 Hardware Maintenance Manual

Bottom view 1 Removable battery 2 Latches 3 Docking-station hook holes 4 Fan louvers 5 Keyboard drainage holes 6 Speakers 7 Emergency-reset hole 8 Nano-SIM card slot * Locating FRUs and CRUs This topic introduces the following service parts: • “Major FRUs and CRUs” on page 51 • “LCD FRUs” on page 53 • “Connector and cable guide” on page 54 Chapter 7. Locations 49

Notes: • Each FRU is available for all types or models, unless otherwise specified. • CRU statement for customers: You can resolve some problems with your product with a replacement part you can install yourself, called a “Customer Replaceable Unit” or “CRU.” Some CRUs are designated as self-service CRUs and others are designated as optional-service CRUs. Installation of self-service CRUs is your responsibility. For optional-service CRUs, you can either install the CRU yourself or you can request that a Service Provider install the CRU according to the warranty service for your product. If you intend on installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware Maintenance Manual. An electronic version of this manual can be found at https://support.lenovo.com. Follow the on-screen instructions to find the manual for your product. You might be required to return the defective part that is replaced by the CRU. When return is required: (1) return instructions, a prepaid shipping label, and a container will be included with the replacement CRU; and (2) you might be charged for the replacement CRU if Lenovo does not receive the defective CRU within thirty (30) days of your receipt of the replacement CRU. See your Lenovo Limited Warranty documentation for full details. ThinkPad computers contain the following types of CRUs and FRU: – Self-service CRUs: Refer to parts that can be installed or replaced easily by customer themselves or by trained service technicians at an additional cost. – Optional-service CRUs: Refer to parts that can be installed or replaced by customers with a greater skill level. Trained service technicians can also provide service to install or replace the parts under the type of warranty designated for the customer’s machine. – FRUs: Refer to parts that must be installed or replaced only by trained service technicians. If customers choose to replace the FRUs by themselves, the product warranty might be affected. 50 T480 Hardware Maintenance Manual

Major FRUs and CRUs Table 6. Major FRUs No. FRU descriptions Self-service CRU Optional-service CRU 1 LCD unit No No 2 Trackpad cable No No 3 Trackpad No No 4 Keyboard bezel assembly No No 5 Power button board and cable No No Chapter 7. Locations 51

Table 6. Major FRUs (continued) No. FRU descriptions Self-service CRU Optional-service CRU 6 Fingerprint-reader bracket (on some models) No No 7 Fingerprint-reader card (on some models) No No 8 Wireless-LAN/Bluetooth card No Yes 9 Wireless-WAN card/M.2 solid-state drive (on some No Yes models) 10 Hard disk drive and hard disk drive bracket Yes No 11 M.2 solid-state drive and M.2 solid-state drive adapter (on Yes No some models) 12 Internal storage drive cable Yes No 13 RJ45 bracket No No 14 Removable battery Yes No 15 Nano-SIM card (on some models) Yes No 16 Base cover assembly Yes No 17 Built-in battery No No 18 Speaker assembly No No 19 Thermal fan assembly No No 20 System board No No 21 Coin-cell battery Yes No 22 Memory modules No Yes 23 Smart card reader and cable (on some models) No No 24 NFC antenna (on some models) No No 25 NFC module (on some models) No No 26 NFC cable (on some models) No No 27 I/O bracket No No 28 Keyboard No Yes 29 TrackPoint cap Yes No a Miscellaneous parts kits No No b Power cord Yes No c ac power adapter Yes No * d Lenovo factory recovery USB key Yes No 52 T480 Hardware Maintenance Manual

LCD FRUs Table 7. LCD FRUs N- FRU descriptions Self-service Optional-service o. CRU CRU 1 LCD-bezel sheet No No 2 Camera shutter (available on some models) No No 3 LCD panel No No 4 LCD cable No No 5 Camera/LED cable No No 6 Conventional camera/microphone module (on some models) No No 7 Infrared camera/microphone module (on some models) No No 8 Wireless-LAN antenna and wireless-WAN antenna (on some models) No No 9 LCD rear-cover support bracket assembly No No Chapter 7. Locations 53

Table 7. LCD FRUs (continued) N- FRU descriptions Self-service Optional-service o. CRU CRU 10 LCD hinge assembly No No 11 LCD rear-cover assembly No No Miscellaneous parts Table 8. Miscellaneous parts FRU descriptions Self-service Optional-service CRU CRU Screw kit No No • Screw, M2*L3, black (20) • Screw, M2.0*L4.6, black (10) • Screw, M2.5*4, black (10) • Screw, M2*L3.5, silver (10) • Screw, M2.5*2.5, silver (10) • Screw, M2.0*2.5, silver (10) • Screw, M2*L4, black (10) • Screw, M2 * L2.8, black (10) System miscellaneous parts kit No No • IO bracket • RJ45 bracket • Speaker rubbers • Sheet support rubber • Microphone rubbers • NFC ferrite sheet • NFC sponge • Smartcard safety mylar • Tape for WWAN antenna fix • Thermal pad for SSD in WWAN slot • Mylar for DIMM slot • Mylar for WWAN connector • Absorber for WWAN slot • Absorber for DIMM slot • Cap for docking-station connector • Docking-station rubber GEO label assembly No No Connector and cable guide This section provides information for Lenovo authorized service technicians to help identify connectors and cables for replacement purpose. To view each FRU and the exploded illustration of the computer, see “Major FRUs and CRUs” on page 51and “LCD FRUs” on page 53. Note: Depending on your model, some connectors or cables might not be available. 54 T480 Hardware Maintenance Manual

System board connectors and cables Table 9. System board Ite- Connector (location) Internal cable required Cable connection m 1 Camera/LED connector Camera/LED cable The camera/LED cable comes with the camera/ (internal) microphone combo card. See “Camera/microphone combo card connector and cable” on page 56. 2 Power-button-card Power-button-card cable The power-button-card cable comes with the power- connector (internall) button card. Connect the cable to this connector. 3 Removable battery No Connect the removable battery to this connector. connector (external) 4 Nano-SIM-card slot No Insert the nano-SIM card into this slot. (external) 5 Coin-cell battery Coin-cell battery cable The coin-cell battery comes with cable. Connect the connector (internal) cable to this connector. 6 LCD connector (internal) LCD cable Connect one end to the LCD panel and the other end to this connector. 7 USB-C connector No Connect USB-C-compatible devices or a USB-C power (external) adapterto this connector. 8 USB-C connector No Connect USB-C compatible devices to this connector. (Thunderbolt 3 compatible) 9 Ethernet extension No Connect ThinkPad Ethernet Extension Adapter Gen 2 connector Gen 2 to attach an Ethernet cable. (external) Chapter 7. Locations 55

Table 9. System board (continued) Ite- Connector (location) Internal cable required Cable connection m 10 Thermal fan connector Thermal fan cable The thermal fan cable comes with the thermal fan. (internal) Connect the cable to this connector. 11 Built-in battery Built-in battery cable The built-in battery cable comes with the cable. connector (internal) Connect the cable to this connector. 12 NFC connector (internal) NFC cable The NFC cable comes with the NFC module. Connect the cable to this connector. 13 Smart-card-reader Smart-card-reader cable The smart-card-reader cable comes with the smart connector (internal) card reader. Connect the cable to this connector. 14 Memory module slot No Insert the memory module into this slot. (internal) 15 Internal storage drive Internal storage drive The internal storage drive cable comes with the internal connector (internal) cable storage drive. Connect the cable to this connector. 16 Fingerprint reader Fingerprint reader cable Connect one end to the fingerprint reader and the other connector (internal) end to this connector. 17 Trackpad connector Trackpad cable Connect the Trackpad cable to this connector. (internal) 18 Speaker connector Speaker assembly cable The speaker assembly comes with cable. Connect the (internal) cable to this connector. 19 Wireless-WAN card slot No Insert the wireless-WAN card into this slot. (internal) 20 Audio connector No Connect headphones or a headset with 3.5-mm (0.14- (external) inch) 4-pole plug to this connector. 21 USB 3.1 connector Gen No Connect USB-compatible devices to this connector. 1 (external) 22 HDMI connector No Connect a compatible digital audio device or video (external) monitor to this connector. 23 Wireless-LAN card slot No Insert the wireless-LAN card into this slot. (internal) 24 Always on USB 3.1 No Connect USB-compatible devices to this connector. connector Gen 1 25 Ethernet connector No Connect the computer to a local area network (LAN) (external) with the Ethernet connector. 26 Media-card slot (internal) No Insert a flash media card into the media-card slot for data access or storage. 27 Keyboard connector Keyboard cable Connect the keyboard cable to this connector. (internal) 28 Trackpoint connector Trackpoint cable Connect the trackpoint cable to this connector. (internal) Camera/microphone combo card connector and cable 56 T480 Hardware Maintenance Manual

Table 10. Camera/microphone combo card It- Connector (location) Internal cable required Cable connection e- m 1 Camera/microphone card Camera/LED cable Connect the end c of the cable to the camera/LED connector (internal) connector on the system board, and connect the end b of the cable to the LCD rear cover. Then, connect the end a of the cable to this connector. NFC module and cable Table 11. NFC module It- Connector (location) Internal cable required Cable connection em 1 NFC module connector NFC module cable Connect one end to the NFC module connector on the (internal) system board and the other end to this connector. 2 NFC antenna connector NFC antenna cable Connect the NFC antenna cable to this connector. (internal) TrackPad connector and cable Chapter 7. Locations 57

Table 12. TrackPad connector It- Connector (location) Internal cable required Cable connection em 1 Trackpad connector Trackpad cable Connect one end to the trackpad connector on the (internal) system board and the other end to this connector. Looking up FRU information For detailed FRU information, including part numbers, descriptions, and substitution part numbers, go to: https://support.lenovo.com/partslookup 58 T480 Hardware Maintenance Manual

Chapter 8. FRU replacement notices This chapter presents notices related to removing and replacing parts. Read this chapter carefully before replacing any FRU. CRU statement for customers: You can resolve some problems with your product with a replacement part you can install yourself, called a “Customer Replaceable Unit” or “CRU.” Some CRUs are designated as self-service CRUs and others are designated as optional-service CRUs. Installation of self-service CRUs is your responsibility. For optional- service CRUs, you can either install the CRU yourself or you can request that a Service Provider install the CRU according to the warranty service for your product. If you intend on installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware Maintenance Manual. An electronic version of this manual can be found at https://support.lenovo.com. Follow the on-screen instructions to find the manual for your product. You might be required to return the defective part that is replaced by the CRU. When return is required: (1) return instructions, a prepaid shipping label, and a container will be included with the replacement CRU; and (2) you might be charged for the replacement CRU if Lenovo does not receive the defective CRU within thirty (30) days of your receipt of the replacement CRU. See your Lenovo Limited Warranty documentation for full details. Screw notices Loose screws can cause a reliability problem. In the ThinkPad notebook computer, this problem is addressed with special nylon-coated screws that have the following characteristics: • They maintain tight connections. • They do not easily come loose, even with shock or vibration. • They are harder to tighten. Do the following when you service this machine: • Keep the screw kit in your tool bag. For the part number of the screw kit, go to https://support.lenovo.com/ partslookup . • It is recommended to use new screws. • It is recommended to use each screw only once. Tighten screws as follows: • Plastic to plastic Turn an additional 90 degrees after the screw head touches the surface of the plastic part. • Logic card to plastic Turn an additional 180 degrees after the screw head touches the surface of the logic card. © Copyright Lenovo 2018 59

Notes: • Ensure that you use the correct screw. It is recommended to use new screws for replacements. If you have a torque screwdriver, tighten all screws firmly to the torque specified in the screw information table for each step. • Ensure that torque screwdrivers are calibrated correctly following country specifications. Retaining serial numbers This topic provides instructions on the following: • “Restoring the serial number of the system unit” on page 60 • “Retaining the UUID” on page 61 Restoring the serial number of the system unit When the computer was manufactured, the EEPROM on the system board was loaded with the serial numbers of the system and all major components. These numbers need to remain the same throughout the life of the computer. If you replace the system board, you must restore the serial number of the system unit to its original value. The serial number of the system unit is written on the label attached to the bottom of the computer. If you cannot find the serial number of the system unit on the bottom of the computer, try the following method to get the number: Note: Before you perform the operation, ensure that the UEFI/Legacy setting within the Startup menu in the ThinkPad Setup program is set to UEFI Only. 1. Connect a USB memory key to the computer. 2. Go to https://www.lenovo.com/maintenanceutilities and follow the instructions on the screen to create a Maintenance Key. Note: Only an authorized Lenovo service technician can access the above Web site. 3. Restart the computer. 4. When the logo is displayed, press Esc. The ThinkPad Config Information Update Utility interface is displayed. 5. Type 1 under Enter the action desired, then press Enter. The ThinkPad Serial Number Update Utility for Asset ID screen is displayed. 6. Type 2 under Enter the action desired, then press Enter. The serial number of each device in your computer is displayed; the serial number of the system unit is listed as follow: 20- Serial number 7. Record the serial number of the system unit. After you replace the system board, do the following to restore the serial number of the system unit: 1. Connect the Maintenance Key to the computer. 60 T480 Hardware Maintenance Manual

2. When the logo is displayed, press Esc. The ThinkPad Config Information Update Utility interface is displayed. 3. Type 1 under Enter the action desired, then press Enter. The ThinkPad Serial Number Update Utility for Asset ID screen is displayed. 4. Type 1 under Enter the action desired, then press Enter. Then follow the instructions on the screen to restore the serial number of the system unit. Retaining the UUID The Universally Unique Identifier (UUID) is a 128-bit number uniquely assigned to your computer at production and stored in the EEPROM of your system board. The algorithm that generates the number is designed to provide unique IDs until the year A.D. 3400. No two computers in the world have the same number. When you replace the system board, perform the following steps to create a new UUID for the system board if the system board does not have a UUID: Note: Before you perform the operation, ensure that the UEFI/Legacy setting within the Startup menu in the ThinkPad Setup program is set to UEFI Only. 1. Connect a USB memory key to the computer. 2. Go to https://www.lenovo.com/maintenanceutilities and follow the instructions on the screen to create a Maintenance Key. Note: Only an authorized Lenovo service technician can access the above Web site. 3. Restart the computer. 4. When the logo screen is displayed, press Esc. The ThinkPad Config Information Update Utility interface is displayed. 5. Type 2 under Enter the action desired, then press Enter. The Auto UUID generation utility interface is displayed. 6. Type y under Change UUID. OK? [Y/N], then press Enter. A new UUID is created and written. If a valid UUID already exists, it is not overwritten. Reading or writing the ECA information Information on Engineering Change Announcements (ECA) is stored in the EEPROM of the system board. The electronic storage of this information simplifies the procedure to check if the ECA has been previously applied to a machine. The machine does not need to be disassembled to check for the ECA application. To check what ECAs have been previously applied to the machine, use the ECA Information Read/Write function on the LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key. 1. Insert the latest version of LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key, and then restart the computer. 2. From the main menu, select 6. Set ECA Information. 3. To read the ECA information, select 2. Read ECA/rework number from EEPROM and follow the instructions on the screen; To read box build date, select 5. Read box build date from EEPROM, and follow the instructions on the screen. After an ECA has been applied to the machine, the EEPROM must be updated to reflect the ECA's application. Use the latest version of LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key to update the EEPROM. Note: Only the ECA number is stored in the EEPROM. The machine type of the ECA is assumed to be the same as the machine type of the machine that had the ECA applied to it. Chapter 8. FRU replacement notices 61

1. Insert the latest version of LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key, and then restart the computer. 2. From the main menu, select 6. Set ECA Information. 3. To write the ECA information, select 1. Write ECA/rework number from EEPROM, and follow the instruction; To write box build date, select 4. Write box build date from EEPROM, and follow the instruction on the screen. If the system board is being replaced, try to read the ECA information from the old system board and transfer the information to the new system. If the system board is inoperable, this will not be possible. 62 T480 Hardware Maintenance Manual

Chapter 9. Removing or replacing a FRU This chapter provides instructions on how to remove or replace a FRU. CRU statement for customers: You can resolve some problems with your product with a replacement part you can install yourself, called a “Customer Replaceable Unit” or “CRU”. Some CRUs are designated as self-service CRUs and others are designated as optional-service CRUs. Installation of self-service CRUs is your responsibility. For optional- service CRUs, you can either install the CRU yourself or you can request that a Service Provider install the CRU according to the warranty service for your product. If you intend on installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware Maintenance Manual. An electronic version of this manual can be found at https://support.lenovo.com. Follow the on-screen instructions to find the manual for your product. You might be required to return the defective part that is replaced by the CRU. When return is required: (1) return instructions, a prepaid shipping label, and a container will be included with the replacement CRU; and (2) you might be charged for the replacement CRU if Lenovo does not receive the defective CRU within thirty (30) days of your receipt of the replacement CRU. See your Lenovo Limited Warranty documentation for full details. General guidelines When removing or replacing a FRU, be sure to observe the following general guidelines: 1. Do not try to service any computer unless you have been trained and certified. An untrained person runs the risk of damaging parts. 2. Before replacing any FRU, review Chapter 8 “FRU replacement notices” on page 59. 3. Begin by removing any FRUs that have to be removed before replacing the failing FRU. Any such FRUs are listed at the beginning of each FRU replacement section. Remove them in the order in which they are listed. 4. Follow the correct sequence in the steps for removing a FRU, as given in the illustrations by the numbers in square callouts. 5. When turning a screw, turn it in the direction as given by the arrow in the illustration. 6. When removing a FRU, move it in the direction as given by the arrow in the illustration. 7. To put the new FRU in place, reverse the removal procedure and follow any notes that pertain to replacement. 8. When replacing a FRU, use the correct screws as shown in the replacement procedures. DANGER Before removing any FRU, turn off the computer, unplug all power cords from electrical outlets, disable the internal battery pack, and then disconnect any interconnecting cables. Attention: After replacing a FRU, do not turn on the computer until you have made sure that all screws, springs, and other small parts are in place and none are loose inside the computer. Verify this by shaking the computer gently and listening for rattling sounds. Metallic parts or metal flakes can cause electrical short circuits. Attention: The system board is sensitive to, and can be damaged by, electrostatic discharge (ESD). Before touching it, establish personal grounding by touching a ground point with one hand or by using an electrostatic discharge strap. © Copyright Lenovo 2018 63

Disabling the built-in battery Before replacing any CRU, ensure that you disable Fast Startup first and then disable the built-in battery. To disable Fast Startup, do the following: 1. Go to Control Panel, and then change the view of Control Panel from Category to Large icons or Small icons. 2. Click Power Options, and then click Choose what the power buttons do on the left pane. 3. Click Change settings that are currently unavailable at the top. 4. If prompted by User Account Control (UAC), click Yes. 5. Clear the Turn on fast startup check box, and then click Save changes. To disable the built-in battery, do the following: 1. Restart your computer. When the logo screen is displayed, immediately press F1 to enter ThinkPad Setup. 2. Select Config ➙ Power. The Power submenu is displayed. 3. Select Disable built-in battery and press Enter. 4. Select Yes in the Setup Confirmation window. The built-in battery is disabled and the computer turns off automatically. Wait three to five minutes to let the computer cool. 1010 Removable battery Important notices for replacing a removable battery Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and provides no warranties for failures or damage arising out of their use. Lenovo provides a diagnostic program to do an automatic battery diagnostic test, which can determine if the removable battery is defective. A removable battery FRU should not be replaced unless this diagnostic test shows that the battery is defective. The only exception to this is if the battery is physically damaged or a customer is reporting a possible safety issue. If no diagnostic program is installed on the computer, the customer should download and install the program to diagnose the battery, before getting a non-physically damaged battery replaced. Note that the replacement of a physically damaged battery is not covered by the warranty. Removal steps of the removable battery DANGER Use only the authorized battery specified for your computer. Any other battery could ignite or explode. Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. 64 T480 Hardware Maintenance Manual

1020 Nano-SIM card 1020 Nano-SIM card Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove the following FRU: • “1010 Removable battery” on page 64 Removal steps of the nano-SIM card 1030 Base cover assembly Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. Chapter 9. Removing or replacing a FRU 65

For access, remove these FRUs: • “1010 Removable battery” on page 64 Removal steps of the base cover assembly 1. Remove the connector cover. 2. Loosen the screws 1. 3. Press the locations a on the base cover assembly with your thumbs and pivot the hooks b upward at the same time to disengage the hooks from the chassis. 66 T480 Hardware Maintenance Manual

4. Press the location c with your thumb and insert your fingers into the holes d to pivot this area of the base cover assembly upward as shown. This area of the base cover assembly will be disengaged from the chassis. 5. Remove the base cover assembly in the numeric order as shown. Chapter 9. Removing or replacing a FRU 67

Applying labels to the base cover assembly: The following illustration shows the location of each label. 1 FCC label 2 GEO label 3 S/N label 4 IMEI label 5 System label 6 Certificate of authenticity label 7 SVT label 8 Asset tag 9 China WWAN/modem label 10 GML label 11 Country label 1040 Memory module Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 68 T480 Hardware Maintenance Manual

Removal steps of the memory module When installing: Insert the notched end of the memory module into the memory slot. Press the memory module in firmly, and pivot it downward until it snaps into place. Ensure that the memory module is firmly installed in the slot and does not move easily. 1050 Internal storage drive Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 Attention: • Do not drop the drive or apply any physical shock to it. The drive is sensitive to physical shock. Improper handling can cause damage and permanent loss of data. • Before removing the drive, have the user make a backup copy of all the information on it if possible. • Never remove the drive while the system is operating or in suspend mode. Chapter 9. Removing or replacing a FRU 69

Removal steps of the 2.5-inch storage drive 70 T480 Hardware Maintenance Manual

Removal steps of the M.2 solid-state drive Chapter 9. Removing or replacing a FRU 71

Step Screw (quantity) Color Torque 7 M2 × 3 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgf-cm) Step Screw (quantity) Color Torque 9 M2 × 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgf-cm) When installing: Ensure that the hard disk drive or solid-state drive is firmly attached and the tape does not cover the speaker. 72 T480 Hardware Maintenance Manual

1060 Wireless-WAN card Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 Removal steps of the wireless-WAN card Step Screw (quantity) Color Torque 3 M2 × 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgf-cm) When installing: Plug the orange cable into the connector labeled MAIN on the card, and plug the blue cable into the connector labeled AUX on the card. If a green cable comes with your computer, plug the cable into the connector with the silkscreen GPS. 1070 Wireless-LAN module Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 Chapter 9. Removing or replacing a FRU 73

Removal steps of the Wireless-LAN module Step Screw (quantity) Color Torque 3 M2 × 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgf-cm) When installing: Plug the gray cable into the connector labeled MAIN or 2 on the card, and plug the black cable into the connector labeled AUX or 1 on the card. 1080 M.2 solid-state drive in the Wireless-WAN-card slot Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 74 T480 Hardware Maintenance Manual

Removal steps of the M.2 solid-state drive in the Wireless-WAN-card slot Step Screw (quantity) Color Torque 2 M2 × 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgf-cm) When installing: Ensure that the M.2 solid-state drive is securely seated in the wireless-WAN-card slot. 1090 Keyboard Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs: • “1010 Removable battery” on page 64 Removal steps of the keyboard Loosen the two screws that secure the keyboard. Chapter 9. Removing or replacing a FRU 75

Turn the computer over and open the display. Push hard in the direction as shown to release the latches from the keyboard bezel. Pivot the keyboard slightly upward as shown by the arrow 1 until you can see the connectors on the bottom side of the keyboard. Then turn over the keyboard as shown by the arrow 2. 76 T480 Hardware Maintenance Manual

Put the keyboard on the palm rest and detach the connectors. Then remove the keyboard. 1100 Coin-cell battery Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 DANGER Use only the authorized battery specified for your computer. Any other battery could ignite or explode. Chapter 9. Removing or replacing a FRU 77

Removal steps of the coin-cell battery When installing: Ensure that the connector of the coin-cell battery is attached firmly. 1110 Speaker assembly Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 Removal steps of the speaker assembly 78 T480 Hardware Maintenance Manual

Step Screw (quantity) Color Torque 2 M2 × 4.6 mm, big head, nylon-coated (4) Black 0.181 Nm (1.85 kgf-cm) When installing: • Ensure that the connector of the speaker assembly is attached firmly. • Route the cables as shown in the following illustration. Attention: As you route the cables, ensure that they are not subject to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken. 1120 Built-in battery Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 Important notices for replacing a built-in battery Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and provides no warranties for failures or damage arising out of their use. Lenovo provides a diagnostic program to do an automatic battery diagnostic test, which can determine if the removable battery is defective. A removable battery FRU should not be replaced unless this diagnostic test shows that the battery is defective. The only exception to this is if the battery is physically damaged or a customer is reporting a possible safety issue. Chapter 9. Removing or replacing a FRU 79

If no diagnostic program is installed on the computer, the customer should download and install the program to diagnose the battery, before getting a non-physically damaged battery replaced. Note that the replacement of a physically damaged battery is not covered by the warranty. Removal steps of the built-in battery DANGER Use only the authorized battery specified for your computer. Any other battery could ignite or explode. Step Screw (quantity) Color Torque 2 M2 × 3 mm, small-head, nylon-coated (2) Black 0.181 Nm (1.85 kgf-cm) 1130 Smart-card reader assembly Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 80 T480 Hardware Maintenance Manual

• “1030 Base cover assembly” on page 65 • “1110 Speaker assembly” on page 78 • “1120 Built-in battery” on page 79 Removal steps of the smart-card reader assembly Step Screw (quantity) Color Torque 3 M2 × 3 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgf-cm) When installing: Ensure that the connector of the smart-card reader is attached firmly. 1140 I/O bracket and RJ45 bracket Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 Chapter 9. Removing or replacing a FRU 81

Removal steps of the I/O bracket Step Screw (quantity) Color Torque 1 M2 × 4 mm, flat head, nylon-coated (3) Black 0.181 Nm (1.85 kgf-cm) Removal steps of the RJ45 bracket Step Screw (quantity) Color Torque 1 M2 × 3.5 mm, flat head, nylon-coated (3) Sliver 0.181 Nm (1.85 kgf-cm) 1150 Thermal fan assembly Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 Removal steps of the thermal fan assembly Notes: • Loosen the screws in ascending alphabetical order as illustrated. 82 T480 Hardware Maintenance Manual

• The screw 2e is available only in some computer models. e When installing: • Ensure that the connector of the thermal fan is attached firmly. • Before you attach the thermal fan assembly to the computer, apply thermal grease, at an amount of 0.2 grams, on the parts marked a and b as shown in the following illustration. Either too much or too less application of grease can cause a thermal problem due to imperfect contact with a component. For the new thermal fan assembly, you must peel off the thin film from the rubbers. – For integrated-graphics models – For discrete-graphics models Chapter 9. Removing or replacing a FRU 83

1160 Trackpad and trackpad cable Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 • “1040 Memory module” on page 68 Removal steps of the trackpad and the trackpad cable 84 T480 Hardware Maintenance Manual

Step Screw (quantity) Color Torque 5 M2 × L2.8 mm, flat-head, nylon-coated (4) Black 0.181 Nm (1.85 kgf-cm) 1170 System board Important notices for handling the system board When handling the system board, read the following: • The system board has an accelerometer, which can be broken when several thousands of G-forces are applied. Note: Dropping a system board from a height of as little as 6 inches so that it falls flat on a hard bench can subject the accelerometer to as much as 6000 G's of shock. • Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite. • Avoid rough handling of any kind. • At every point in the process, be sure not to drop or stack the system board. • If you put a system board down, be sure to put it only on a padded surface such as an ESD mat or a corrugated conductive material. Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: Chapter 9. Removing or replacing a FRU 85

• “1010 Removable battery” on page 64 • “1020 Nano-SIM card” on page 65 • “1030 Base cover assembly” on page 65 • “1040 Memory module” on page 68 • “1050 Internal storage drive” on page 69 • “1060 Wireless-WAN card” on page 73 or “1080 M.2 solid-state drive in the Wireless-WAN-card slot” on page 74 • “1070 Wireless-LAN module” on page 73 • “1090 Keyboard” on page 75 • “1100 Coin-cell battery” on page 77 • “1110 Speaker assembly” on page 78 • “1120 Built-in battery” on page 79 • “1140 I/O bracket and RJ45 bracket” on page 81 • “1150 Thermal fan assembly” on page 82 The following components soldered on the top side of the system board are extremely sensitive. When you service the system board, avoid any kind of rough handling. a Graphics processing unit (GPU) b Central processing unit (CPU) c Embedded controller TM d Accelerometer chip for the hard disk drive Active Protection System Note: The graphics chip a is only for discrete-graphics models. c d 86 T480 Hardware Maintenance Manual

Removal steps of the system board Step Screw (quantity) Color Torque 15 M2 × 3 mm, flat head, nylon-coated (6) Black 0.181 Nm (1.85 kgf-cm) When installing: Ensure that the connectors are attached firmly. Chapter 9. Removing or replacing a FRU 87

1180 Power-button card Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1020 Nano-SIM card” on page 65 • “1030 Base cover assembly” on page 65 • “1040 Memory module” on page 68 • “1050 Internal storage drive” on page 69 • “1060 Wireless-WAN card” on page 73 or “1080 M.2 solid-state drive in the Wireless-WAN-card slot” on page 74 • “1070 Wireless-LAN module” on page 73 • “1090 Keyboard” on page 75 • “1100 Coin-cell battery” on page 77 • “1110 Speaker assembly” on page 78 • “1120 Built-in battery” on page 79 • “1130 Smart-card reader assembly” on page 80 • “1140 I/O bracket and RJ45 bracket” on page 81 • “1150 Thermal fan assembly” on page 82 • “1170 System board” on page 85 Removal steps of the power-button card Step Screw (quantity) Color Torque 1 M2 × 3 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgf-cm) When installing: Ensure that the connector of the power-button card is attached firmly. 1190 Fingerprint-reader card Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. 88 T480 Hardware Maintenance Manual

For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1020 Nano-SIM card” on page 65 • “1030 Base cover assembly” on page 65 • “1040 Memory module” on page 68 • “1050 Internal storage drive” on page 69 • “1060 Wireless-WAN card” on page 73 or “1080 M.2 solid-state drive in the Wireless-WAN-card slot” on page 74 • “1070 Wireless-LAN module” on page 73 • “1090 Keyboard” on page 75 • “1100 Coin-cell battery” on page 77 • “1110 Speaker assembly” on page 78 • “1120 Built-in battery” on page 79 • “1130 Smart-card reader assembly” on page 80 • “1140 I/O bracket and RJ45 bracket” on page 81 • “1150 Thermal fan assembly” on page 82 • “1170 System board” on page 85 Removal steps of the fingerprint-reader card Step Screw (quantity) Color Torque 1 M2 × 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgf-cm) Chapter 9. Removing or replacing a FRU 89

1200 NFC module Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1020 Nano-SIM card” on page 65 • “1030 Base cover assembly” on page 65 • “1040 Memory module” on page 68 • “1050 Internal storage drive” on page 69 • “1060 Wireless-WAN card” on page 73 or “1080 M.2 solid-state drive in the Wireless-WAN-card slot” on page 74 • “1070 Wireless-LAN module” on page 73 • “1090 Keyboard” on page 75 • “1100 Coin-cell battery” on page 77 • “1110 Speaker assembly” on page 78 • “1120 Built-in battery” on page 79 • “1130 Smart-card reader assembly” on page 80 • “1140 I/O bracket and RJ45 bracket” on page 81 • “1150 Thermal fan assembly” on page 82 • “1170 System board” on page 85 Removal steps of the NFC module 1210 LCD unit Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 90 T480 Hardware Maintenance Manual

Removal steps of the LCD unit Step Screw (quantity) Color Torque 9 M2.5 × 4 mm, flat-head, nylon-coated (4) Black 0.293 Nm (3.0 kgf-cm) Chapter 9. Removing or replacing a FRU 91

When installing: Attention: As you route the cables, ensure that they are not subject to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken. • Ensure that the connectors are attached firmly. 1220 Keyboard bezel assembly Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1020 Nano-SIM card” on page 65 • “1030 Base cover assembly” on page 65 • “1040 Memory module” on page 68 • “1050 Internal storage drive” on page 69 • “1060 Wireless-WAN card” on page 73 or “1080 M.2 solid-state drive in the Wireless-WAN-card slot” on page 74 92 T480 Hardware Maintenance Manual

• “1070 Wireless-LAN module” on page 73 • “1090 Keyboard” on page 75 • “1100 Coin-cell battery” on page 77 • “1110 Speaker assembly” on page 78 • “1120 Built-in battery” on page 79 • “1130 Smart-card reader assembly” on page 80 • “1140 I/O bracket and RJ45 bracket” on page 81 • “1150 Thermal fan assembly” on page 82 • “1170 System board” on page 85 • “1180 Power-button card” on page 88 • “1190 Fingerprint-reader card” on page 88 • “1200 NFC module” on page 90 • “1210 LCD unit” on page 90 2010 LCD bezel sheet Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 Removal steps of the LCD bezel sheet Chapter 9. Removing or replacing a FRU 93

Removal steps of the LCD bezel sheet and the camera shutter When installing: • Install a new LCD bezel sheet whenever the old one is removed. • Ensure that all the latches are attached firmly. 2020 LCD panel Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 94 T480 Hardware Maintenance Manual

Removal steps of the LCD panel (for models with HD panel, FHD panel, or touch panel) Step Screw (quantity) Color Torque 1 M2 × 2.5 mm, small-head, nylon-coated (4) Sliver 0.181 Nm (1.85 kgf-cm) When installing: Ensure that the connector of the LCD cable is attached firmly. Chapter 9. Removing or replacing a FRU 95

Removal steps of the LCD panel (for models with WQHD panel) 2030 LCD hinge assembly Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 • “1210 LCD unit” on page 90 • “2010 LCD bezel sheet” on page 93 • “2020 LCD panel” on page 94 Removal step of the LCD hinge assembly (for models with HD panel, FHD panel, or touch panel) For models with brackets Step Screw (quantity) Color Torque 1 M2.5 × 2.5 mm, small-head, nylon-coated (4) Sliver 0.293 Nm (3.0 kgf-cm) 96 T480 Hardware Maintenance Manual

For models without brackets Step Screw (quantity) Color Torque 1 M2.5 × 2.5 mm, small-head, nylon-coated (4) Sliver 0.293 Nm (3.0 kgf-cm) Chapter 9. Removing or replacing a FRU 97

Removal step of the LCD hinge assembly and LCD rear-cover support bracket assembly (for models with WQHD panel) Step Screw (quantity) Color Torque 1 M2.5 × 2.5 mm, small-head, nylon-coated (4) Sliver 0.293 Nm (3.0 kgf-cm) 2 M2 × 2.5 mm, small-head, nylon-coated (2) Sliver 0.181 Nm (1.85 kgf-cm) 2040 Camera/microphone module Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 • “1210 LCD unit” on page 90 • “2010 LCD bezel sheet” on page 93 • “2020 LCD panel” on page 94 98 T480 Hardware Maintenance Manual

Removal steps of the camera/microphone module When installing: Ensure that the connector is attached firmly. 2050 Camera and LED cable, and LCD cable Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 • “1210 LCD unit” on page 90 • “2010 LCD bezel sheet” on page 93 • “2020 LCD panel” on page 94 Chapter 9. Removing or replacing a FRU 99

Removal steps of the camera and LED cable, and LCD cable When installing: Attention: As you route the cables, ensure that they are not subject to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken. 2060 Wireless-LAN/WAN antenna assembly and LCD rear-cover assembly Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 • “1210 LCD unit” on page 90 • “2010 LCD bezel sheet” on page 93 • “2020 LCD panel” on page 94 • “2030 LCD hinge assembly” on page 96 100 T480 Hardware Maintenance Manual

Removal steps of the wireless-LAN/WAN antenna assembly and LCD rear-cover assembly When installing: Route the cables as shown in the following illustration. Attention: As you route the cables, ensure that they are not subject to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken. Chapter 9. Removing or replacing a FRU 101

a b c d Antenna locations a Wireless-LAN auxiliary antenna (black) b Wireless-WAN auxiliary antenna (blue) (available on some models) c Wireless-WAN main antenna (orange) (available on some models) d Wireless-LAN main antenna (grey) 102 T480 Hardware Maintenance Manual

Appendix A. Notices Lenovo may not offer the products, services, or features discussed in this document in all countries. Consult your local Lenovo representative for information on the products and services currently available in your area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service that does not infringe any Lenovo intellectual property right may be used instead. However, it is the user’s responsibility to evaluate and verify the operation of any other product, program, or service. Lenovo may have patents or pending patent applications covering subject matter described in this document. The furnishing of this document does not give you any license to these patents. You can send license inquiries, in writing, to: Lenovo (United States), Inc. 1009 Think Place - Building One Morrisville, NC 27560 U.S.A. Attention: Lenovo Director of Licensing LENOVO PROVIDES THIS PUBLICATION “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do not allow disclaimer of express or implied warranties in certain transactions, therefore, this statement may not apply to you. This information could include technical inaccuracies or typographical errors. Changes are periodically made to the information herein; these changes will be incorporated in new editions of the publication. Lenovo may make improvements and/or changes in the product(s) and/or the program(s) described in this publication at any time without notice. The products described in this document are not intended for use in implantation or other life support applications where malfunction may result in injury or death to persons. The information contained in this document does not affect or change Lenovo product specifications or warranties. Nothing in this document shall operate as an express or implied license or indemnity under the intellectual property rights of Lenovo or third parties. All information contained in this document was obtained in specific environments and is presented as an illustration. The result obtained in other operating environments may vary. Lenovo may use or distribute any of the information you supply in any way it believes appropriate without incurring any obligation to you. Any references in this publication to non-Lenovo Web sites are provided for convenience only and do not in any manner serve as an endorsement of those Web sites. The materials at those Web sites are not part of the materials for this Lenovo product, and use of those Web sites is at your own risk. Any performance data contained herein was determined in a controlled environment. Therefore, the result obtained in other operating environments may vary significantly. Some measurements may have been made on development-level systems and there is no guarantee that these measurements will be the same on generally available systems. Furthermore, some measurements may have been estimated through extrapolation. Actual results may vary. Users of this document should verify the applicable data for their specific environment. © Copyright Lenovo 2018 103

Electronic emissions notices For electronic emission information on Class B digital devices, refer to the corresponding information in the User Guide. EU contact: Lenovo, Einsteinova 21, 851 01 Bratislava, Slovakia Trademarks The following terms are trademarks of Lenovo in the United States, other countries or both: Lenovo Lenovo logo ThinkPad ThinkPad logo TrackPoint Thunderbolt is a trademark of Intel Corporation or its subsidiaries in the U.S. and/or other countries. Microsoft, Windows, and Windows Server are trademarks of the Microsoft group of companies. The terms HDMI and HDMI High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC in the United States and other countries. Other company, product, or service names may be the trademarks or service marks of others. 104 T480 Hardware Maintenance Manual

Appendix B. Abbreviation table The following table lists all abbreviations and acronyms used in this manual. Abbreviation Term 3G third generation of mobile telecommunications technology BGA Ball Grid Array BIOS basic input/output system CMOS complementary metal-oxide semiconductor COA Certificate of Authentication CRC cyclic redundancy check CRT cathode ray tube CRU customer-replaceable unit CTO configure to order EAIA Enhanced Asset Information Area ECA Engineering Change Announcements EEPROM Electrically Erasable Programmable Read-Only Memory EFI Extensible Firmware Interface EPO emergency power-off ESD electrostatic discharge EU European Union FCC Federal Communications Commission FHD Full High Definition FRU Field Replaceable Unit GAV General Announce Variant GPU graphics processing unit HD High Definition HDD hard disk drive HDMI high-definition multimedia interface ICs integrated circuits ICCID integrate circuit card identity ISO International Standardization Organization LAN local area network LCD liquid crystal display MAC media access control MT machine type MTM machine type and model © Copyright Lenovo 2018 105

Abbreviation Term PC personal computer PCH Platform Controller Hub POST power-on self-test RAM random-access memory RF radio frequency RFID radio-frequency identification RI ring indicator RJ registered jack SATA Serial Advanced Technology Attachment SIM subscriber identity module SVP supervisor password TFTs thin-film transistors UEFI Unified Extensible Firmware Interface USB Universal Serial Bus UUID universally unique identifier VGA video graphics array VRAM video random-access memory WAN wide area network WQHD wide quad high definition 106 T480 Hardware Maintenance Manual

Part Number: SP40K05014 Printed in (1P) P/N: SP40K05014 *1PSP40K05014*