IBM ThinkPad 770E, Hardware Maintenance Manual

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SYMPTOM-TO-FRU INDEX
Symptom / Error FRU / Action in Sequence
No beep, power-on indicator
on, and a blank LCD during
POST. 1. Reseat the CPU card
2. Reseat the video card.
3. System board
Ÿ
LCD backlight not
working.
Ÿ
LCD too dark.
Ÿ
LCD brightness cannot
be adjusted.
Ÿ
LCD contrast cannot
be adjusted.
1. Reseat the LCD
connectors.
2. LCD assembly
3. Video card
4. System board
Ÿ
LCD screen
unreadable.
Ÿ
Characters missing
pels.
Ÿ
Screen abnormal.
Ÿ
Wrong color displayed.
1. See important note
for “LCD-Related
Symptoms.”
2. Reseat all LCD
connectors.
3. LCD assembly
4. Video card
5. System board
LCD has extra horizontal or
vertical lines displayed. 1. LCD assembly
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 on the DSP Modem
icon in the ThinkPad
Configuration program.
DOS:
Run the MWMODEM ON
command.
PC Card-Related Symptoms
Symptom / Error FRU / Action in Sequence
The PC Card does not work
in either the upper slot or
the lower slot.
Diagnostic error code:
DEV 080
ERR 33
FRU 7210
1. Reseat the PCMCIA
slot assembly.
2. PCMCIA slot assembly
3. System board
The PCMCIA slot pin is
damaged. 1. PCMCIA slot
assembly
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