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LCD-Related Symptoms
Important
The LCD for the notebook computer contains over
921,000 thin-film transistors (TFTs). A small number
of missing, discolored, or lighted dots (on all the time)
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 21 or
more.
Symptom / Error FRU / Action in Sequence
No beep, power-on indicator
on, and a blank LCD during
POST.
1. System board
2. DC/DC card
3. Video card
4. CPU card
LCD backlight not
working, or
LCD too dark, or
LCD brightness cannot
be adjusted, or
LCD contrast cannot
be adjusted.
1. Reseat the LCD
connectors.
2. LCD assembly
3. DC/DC card
LCD screen
unreadable, or
Characters missing
pels, or
Screen abnormal, or
Wrong color displayed.
1. See important note
for “LCD-Related
Symptoms.”
2. Reseat all LCD
connectors.
3. LCD assembly
4. System board
5. Video card
LCD has extra horizontal or
vertical lines displayed.
LCD assembly
Keyboard/TrackPoint III-Related
Symptoms
Symptom / Error FRU / Action in Sequence
Keyboard (one or more
keys) does not work.
1. Reseat the keyboard
connector on the
video card.
2. Reseat the three
keyboard cables on the
keyboard card.
3. Keyboard
4. Video card
5. System board
366 IBM Mobile Systems - ThinkPad HMM Volume 3