68kMLA Classic Interface
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| Click here to select a new forum. | | LC575 powers up. no chime. no video | Posted by: dangil on 2020-08-31 10:59:29
I have a LC520 upgraded with a 575 logic board... before the logic board recap, it wouldn't even power up
after the recap, it powered, CD and HD spun up, but no chime and no video
I completely recapped the analog board and now, after the power key is pressed, I can hear the power supply clicking and never starting up. I believe it's shorted somewhere
2 problems:
- regarding the analog board, I've checked every capacitor for polarity and it all checks out. all caps were new. what's the next step? how can I test the power supply without attaching the logic board to the rest of the mac?
- after I "ruined" the analog board, I tested the logic board on a working color classic II.. it has the same effect.. powers up, but no video, so I guess the logic board has issues too.. tried different VRAM memory, no effect.. could it be the Egret chip? what's the next step?
| Posted by: bibilit on 2020-08-31 15:40:51
More likely the Egret
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