Apple lc 580.performa 580cd Service Manual

 

 Troubleshooting

Symptom Charts/Miscellaneous

 

 (Continued)

 

 - 25

 

Screen shows “Sad 

Macintosh” icon and 

black vertical lines; 

screeching sound

1 Replace RAM SIMMs on logic board. 

2 Replace logic board. Retain customer’s SIMMs.

Headphone jack does 

not operate correctly

1 Verify that headphone jack is seated properly.

2 Replace front panel control board.

3 Replace chassis harness assembly.

No sound from 

external speakers

1 Check that volume is turned on (manually or through Control 

Panel). 

2 Verify that headphones are unplugged. 

3 Verify that speaker connectors are properly connected. 

4 Test speakers with known-good Macintosh; if speakers do not 

work, replace them.

5 Replace logic board.