LCD-Related Symptoms
Important
The LCD for the notebook computer contains over
2,359,296 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. Reseat the CPU card.
2. DC/DC card
3. Video card
4. System board
5. LCD cable assembly
LCD backlight not
working
LCD too dark
LCD brightness cannot
be adjusted (TFT)
1. Reseat the LCD
connectors.
2. LCD unit
3. DC/DC card
4. Cable for inverter card
5. Inverter card
LCD screen
unreadable
Characters missing
pels
Screen abnormal
Wrong color displayed
1. See important note
for “LCD-Related
Symptoms” on
page 47.
2. Reseat all LCD
connectors.
3. LCD unit
4. System board
5. Video card
LCD has extra horizontal or
vertical lines displayed.
1. LCD cable assembly
2. LCD unit
Modem (DSP)-Related Symptoms
Symptom / Error FRU / 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.
In OS/2, DOS, or Windows,
the modem does not work.
Check that the DSP
Modem is active.
OS/2 and Windows:
Click the DSP Modem icon
in the ThinkPad
Configuration program.
DOS:
Run the MWMODEM ON
command.
558 IBM Mobile Systems HMM
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