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
LCDscreen
unreadable
Charactersmissing
pels
Screenabnormal
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