Эксплуатация Оборудования для IBM 770

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

LCD backlight not
working.

LCD too dark.

LCD brightness cannot
be adjusted.

LCD contrast cannot
be adjusted.

1. Reseat the LCD

connectors.

  2. LCD assembly
  3. Video card
  4. System board

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 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