Help needed Yamaha YST-SW800 faults

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samurai_x47

New Member

• Apr 10, 2019

• #41

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

 

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samurai_x47

New Member

• Apr 14, 2019

• #42

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

 

unclejed613

Well-Known Member

Most Helpful Member

• Apr 23, 2019

• #43

Nigel Goodwin said:

as pieces of wire don't often blow.

Click to expand...

that jumper was marked with a black marker as part of factory QA inspection.... like you said jumpers don't usually blow.