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bibilit

Classic II Analog Board / no output

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I am trying to fix a Classic II Analog Board, the primary side is ok and the fuse also, but i have no output on the secondary side (0 volt)

 

Removing and replacing capacitors didn't solve anything, probably a faulty component, but don't know where to look next.

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Not fixed this unit yet, but had another one to repair, blowing fuses all the time.

 

My first bet was that the bridge rectifier was bad, and at first check - and + where shorted, but on removal all was ok.

 

Turned my attention to surrounding components, in the end The Mosfet on QP2 was shorted (IRFBC40).... a swap, some new caps on the Logic and Analog board and i have a nice working unit

 

post-1736-0-43622200-1463237396_thumb.jpg

 

Already been talked about here, so this Mosfet has a tendency to go bad.

Edited by bibilit

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Ok thanks is this the CNY17G-3 ?

 

For my information, is this component acting as a switch ?

 

Also, do you know the difference between the CNY17-3 and the G variant ? (as the first can be found easily)

 

Thanks again.

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No luck here.

 

I saved one board yesterday, but replacing the Optocoupler in the others didn't solved the issue.

 

Any idea where to look next ?

Edited by bibilit

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