Help needed Yamaha YST-SW800 faults

[samurai_x47]

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

 

[samurai_x47]

Found the thermal pads behind the power transistors to be dark brown and totally dried up, resistors close to them also gone bad.

 

[unclejed613]

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.