Lenovo 20S7S02U00, Hardware Maintenance Manual

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Error codes Solutions
0284: TCG-compliant functionality-related error (might be
the BIOS code validation failure)
Replace the system board (service provider only).
0285: TCG-compliant functionality-related error (might be
the TPM initialization failure)
Replace the system board (service provider only).
0286: Integrated graphics error
Replace the system board (service provider only).
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, system-status indicator on, LCD blank, and no
POST. 1. Run LCD Self Test .
2. Ensure that every connector is connected tightly and
correctly.
3. Reseat memory module.
4. Replace the system board.
No beep, system-status indicator on, and LCD blank
during POST.
1. Run LCD Self Test .
2. Reseat memory module.
3. 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.
Chapter 4
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Related service information
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