Guitar amp repair help needed

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Purely as a matter of interest, how much did he charge you?.
 
He charged $160, parts and labor. A lot more than I wanted to spend, but I was kind of stuck at that point. He told me about all the time he put into it, and it works, so I just grin and bear it.
 
Now your amp may had been thrown away.
I ever faced Marshall guitar amp using two TA7293 ics. The problem was same as yours. destroyed all ic, burn out. at the last check I found there's a leak/shorted their heatsink to Ground, why? because the wing of ic's is positive point. so that was chaos shorting on power happened. thats all.
I will say, be carefull to replacing and attaching power ic and heatsink. (especially TA729x type)
 
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