SX-636 Repair Help

[guest148]

Well, I've tested every transistor on the power amp board, including my new replacements and the outputs again. Every single one tested good, showing normal voltage drops and no shorts.

 

[guest148]

Hey guys, as a shot in the dark I re-soldered all connections on the power amp board and replaced my new transistors with others I had on hand, and somehow, that has seemed to fix the issue. I've put the outputs back in with some new thermal paste and I've had the amp running for a couple hours without problem. I have no idea what the issue was, possibly a cold solder join somewhere I guess, but I would like to thank all you guys for all the help and the fantastic resources you have here.