Apple macintosh iivx.vi.perf 600 Servicehandbuch

 

 Troubleshooting

Symptom Charts/Video

 

 (Continued)

 

 - 3

 

Partial or whole 

screen is bright and 

audio is present, but 

no video information 

is visible

1 Replace monitor. Refer to appropriate monitor manual to 

troubleshoot defective monitor. 

2 Replace video cable.

3 Replace VRAM SIMMs.

4 Replace logic board. Retain customer’s SIMMs.

Screen is completely 

dark, fan is not 

running, and LED is 

not lit

1 Verify that external power cables are properly connected.

2 Remove peripherals.

3 Remove NuBus cards and switch on power again. (Combined 

NuBus cards should not draw more than 45 watts.)

4 Remove accelerator card.

5 Replace power supply.

6 Replace logic board. Retain customer’s SIMMs.