Hi techs, I have a Sony hcd-sh2000 sound system which has very faint sound output behind a loud humming noise. I have tested all semiconductors voltages against ones in the schematic and all seem to be ok except mute output from system controller IC which is a 3.3v but is appearing and disappearing. I have isolated this leg but still the 3.3v is on and off. Anyone ever come across this fault please help.
See attached the schematic and the main and amp boards.
See attached the schematic and the main and amp boards.
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