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Symptom / Error FRU / Action in Sequence
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. Goto
“Keyboard/TrackPoint
III-Related Symptoms.”
3. Keyboard
4. Subcard
5. System board
Pointer moves automatically
or does not work correctly.
1. See
“Keyboard/TrackPoint
III-Related
Symptoms.”
Indicator-Related Symptoms
Symptom / Error FRU / Action in Sequence
Indicator incorrectly remains
off or on, but system runs
correctly.
1. Subcard
2. System board
Battery power status
indicator blinks from green,
yellow, to orange.
1. Check that a correct
battery is installed.
2. Battery pack
3. Subcard
4. System board
206 IBM Mobile Systems - ThinkPad HMM Volume 3