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