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Uncle Bulgaria · 20th Jul 2019, 9:50 am

Thanks Tony. I wouldn't know what I was looking for though! The difficulty is that when the board is in position, the solder side is not accessible, so I'd have to solder on flying leads to all possible positions.

If I were going to that trouble I might as well swap the transistors around, which in fact is what I ended up doing last night. Now the left channel still fades, but the right (previously working channel) has disappeared entirely! It came back with some judicious wiggling of board 300, which annoyed me as I have gone over all the pin connections and resoldered them, despite no dry joints being evident under a loupe.

I suppose I'll have to go back over the whole board.

20th Jul 2019, 9:50 am	#7
Uncle Bulgaria Nonode Join Date: May 2016 Location: Cornwall, UK. Posts: 2,329	Re: Uher CR240 Troubleshooting Best Practice Thanks Tony. I wouldn't know what I was looking for though! The difficulty is that when the board is in position, the solder side is not accessible, so I'd have to solder on flying leads to all possible positions. If I were going to that trouble I might as well swap the transistors around, which in fact is what I ended up doing last night. Now the left channel still fades, but the right (previously working channel) has disappeared entirely! It came back with some judicious wiggling of board 300, which annoyed me as I have gone over all the pin connections and resoldered them, despite no dry joints being evident under a loupe. I suppose I'll have to go back over the whole board.