No-Beep Symptoms; Lcd-Related Symptoms - Lenovo 20X1 Hardware Maintenance Manual

Error codes
0287: Discrete graphics error
0288: Computer display error

No-beep symptoms

Table 4. No-beep symptoms
Symptom or error
No beep, power-on indicator on, LCD blank, and no
POST.
No beep, power-on indicator on, and LCD blank during
POST.
The power-on password prompt appears.
The hard disk password prompt appears.

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 notebook computers 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.
LCD Self Test
Solutions
1. Reinstall or replace the discrete graphics card
(service provider only).
2. If step 1 does not work, replace the system board
(service provider only).
1. Reconnect the display cable on both the system
board side and the computer display side (service
provider only) and check the LCD panel.
2. If step 1 does not work, connect an external
display to your computer and check the status
(customer or service provider).
• If the external display works, replace the LCD
panel (service provider only).
• If the external display does not work, replace
the system board (service provider only).
FRU or action, in sequence
1. Run LCD Self Test.
2. Ensure that every connector is connected tightly and
correctly.
3. Reseat memory module.
4. Replace the system board.
1. Run LCD Self Test.
2. Reseat memory module.
3. Replace the system board.
A power-on password or a supervisor password is set.
Type the password and press Enter.
A hard disk password is set. Type the password and
press Enter.
Chapter 4
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Related service information
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