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Help needed Yamaha YST-SW800 faults

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Ok Nigel. I found 2 OL fets on amp board, rest seemed fine on the amp board, output transistors and load sharing resistors I'll test next on the power pcb
 
Found the thermal pads behind the power transistors to be dark brown and totally dried up, resistors close to them also gone bad.
 
as pieces of wire don't often blow.
that jumper was marked with a black marker as part of factory QA inspection.... like you said jumpers don't usually blow.
 
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