Lenovo ThinkPad X230 Tablet - Manual (Page 46)

Table 4. Beep symptoms (continued)
Symptom or error FRU or action, in sequence
Three short beeps, pause, three more short beeps, and
one short beep.
One short beep, pause, three short beeps, pause, three
more short beeps, and one short beep.
1. Memory module.
2. System board.
Only the cursor appears. Reinstall the operating system.
Four cycles of four short beeps and a blank screen. System board (security chip)
Five short beeps and a blank screen. System board
No-beep symptoms
Table 5. No-beep symptoms
Symptom or error FRU or action, in sequence
No beep, power-on indicator on, LCD blank, and no
POST. 1. Ensure that every connector is connected tightly
and correctly.
2. Memory module.
3. System board.
No beep, power-on indicator on, and LCD blank during
POST. 1. Reseat memory module.
2. 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 6. LCD-related symptoms
Symptom or error FRU or action, in sequence
No beep, power-on indicator on, and a blank LCD during
POST. System board.
• LCD backlight not working.
• LCD too dark.
• LCD brightness cannot be adjusted.
• LCD contrast cannot be adjusted. 1. Reseat the LCD connectors.
2. LCD assembly.
3. System board.
40 Hardware Maintenance Manual