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Originally Posted by Alex KL-1
The IC is too hot (= high current drain)?
Or, the 24V have some series resistor partially open?
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Could be. Not sure how to track that down other than pulling components. I wonder if there's some way I can isolate the power supply and just test that to see if I get the 24V out of it or not. That way I can know if something is sinking current on the main PCB or not.
I need some way to narrow things down.
Quote:
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EDIT: IC with high current drain can be or a faulty IC or a short in the V yoke.
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I measured the yoke, and it checks out. The two parts say 0.5ohms and 20ohms on the schematic, and I get 1ohm and 20ohms, so looks okay thankfully.
EDIT:
Okay, I think I found it. Q602, the Mosfet creating the 24V source and it's blown open. Mystery probably solved. I check all the electrolytics in the ~20V sources area and they are all good, and the other little transistor tests normal.