Electronics > Repair

Help with dead AT PC Power Supply

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naujoks:
Ok, I used IPA on the PCB and touched it, but nothing is getting warm.
The bench PSU draws only 0.031A.

Harry_22:
Increase the voltage step by step to get 1W consumption. Maximum limit is 12V.

naujoks:
Ok, the biggest IC on the board is getting warm.

Harry_22:
This is PWM controller itself. Probably internal zener diode is broken.
Try cleaning the black stuff off the chip top to clarify its name.

naujoks:
Ahhh I was hoping the black stuff is some kind of plastic shrink warp, but the material is almost like the body of an IC.
I tried to scrape it off, but the model number of the IC came off as well. I thought I could see "A23", but no guarantee, and it isn't much to go by :(

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