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LCD-Related Symptoms
Important
The LCD for the notebook computer contains over
921000 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 dots satisfies the
following condition:
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. Subcard
LCD backlight not
working
LCD too dark
LCD brightness cannot
be adjusted (TFT)
LCD contrast cannot
be adjusted (STN)
1. Reseat the LCD
connectors.
2. LCD unit
3. Subcard
LCD screen
unreadable
Characters missing
pels
Screen abnormal
Wrong color displayed
1. See important note
for “LCD-Related
Symptoms.”
2. Reseat all LCD
connectors.
3. LCD unit
4. System board
5. Subcard
LCD has extra horizontal or
vertical lines displayed.
LCD unit
Keyboard/TrackPoint III-Related
Symptoms
Symptom / Error FRU / Action in Sequence
Keyboard (one or more
keys) does not work.
1. Reseat the keyboard
cable on the subcard.
2. Keyboard
3. Subcard
4. System board
TrackPoint III does not
work.
1. Reseat the keyboard
cable on the subcard.
2. Go to “TrackPoint III
Checkout” on page 32.
3. Keyboard
4. Subcard
5. System board
ThinkPad 380, 385 (2635) 47