SYMPTOM-TO-FRU ERROR MESSAGES
LCD-related symptoms
Important
The TFT LCD for the notebook computer contains
over 2,359,296 thin-film transistors (TFTs). 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.
The LCD should be replaced if the number of missing,
discolored, or lighted dots in any background is:
XGA (13.3 in.): 5 or more bright dots, 5 or more
dark dots, or a total of 9 or more bright and dark
dots.
Symptom or error FRU or action, in
sequence
No beep, power-on indicator
on, and a blank LCD during
POST.
1. 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.
LCD screen
unreadable.
Characters missing
pixels.
Screen abnormal.
Wrong color displayed.
1. See important note
for “LCD-related
symptoms.”
2. Reseat all LCD
connectors.
3. LCD assembly.
4. System board.
Extra horizontal or vertical
lines displayed on the LCD.
1. LCD assembly.
Modem-related symptoms
Symptom or error FRU or action, in
sequence
In OS/2, DOS, or Windows
multimedia programs, no
sound comes from the
computer. (Only system
beeps are heard at
power-on.)
Check that the device
driver is installed
correctly.
30 ThinkPad 600X Hardware Maintenence Manual
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