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Macintosh Portable Sound Volume Issue

Sad_Mac

6502
I have a M5120 that seems to have really low audio output and doesn’t respond when the volume slider is used. Upon startup chime it has loud audio then halfway through it becomes very low sound. I have decent sound output through the mono jack but still no change with the volume slider. The mother board has been recapped and the hybrid replaced. I clean the pads underneath the ASC and both Sony chips. Reading schematics isn’t my strong suit but if I had a good breakdown of where voltage should be going etc, I think I could tackle the issue. Any help would be great!
 

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