Apple macintosh ii.iix.iifx Service Manual

 

 Troubleshooting

Symptom Charts/Video - 6

 

Screen is black, audio 

and drive operate, fan 

is running, and LED is 

lit

1 Adjust brightness on monitor.

2 Verify monitor works with another Macintosh.

3 Replace monitor. Refer to appropriate monitor manual to 

troubleshoot defective monitor. 

4 Replace video cable.

5 Move video card to different slot.

6 Replace video card. Refer to Video Cards manual.

7 Replace SIMMs. 

8 Replace logic board. Retain customer’s SIMMs.

9 Replace power supply.