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Well, hardly the same thing, but when I garbage-picked a 90s Sony, the audio was dead. I asked the folks at riddledtv.com, and got a pinpoint repair tip: a tiny little pcb that handles SAP was apparently dead. Bypassed it with a couple capacitors and it was fine.
My point is, it's probably something minor. The solid state components are probably fine. Another thing I've found by working on my Sony - pcb solder joints don't last. Go over the boards with a magnifying glass and a fine-tooth comb, you might be suprised at the amount of resoldering you'll be doing.
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