Apple quadra.lc 630.performa 640 Service Manual

 

 Troubleshooting

Symptom Charts/Video - 7

 

Screen is dark, audio 

and drive do not 

operate, but fan runs 

and LED is lit

1 Reseat logic board.

2 Remove expansion card, if present.

3 Remove peripherals.

4 Replace SIMMs.  Refer to Memory  manual.

5 Replace logic board.  Retain customer’s  SIMMs.

6 Replace power supply.

Partial or whole 

screen is bright and 

audio is present, but 

no video information 

is visible

1 Reseat logic board.

2 Replace fan/video card bracket.

3 Replace monitor.

4 Replace logic board.  Retain customer’s  SIMMs.