Electronics > Repair

ACBel ATX PSU Weird Behavior (power-cycling).

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Dannyx:
Thanks. There aren't too many components left underneath the caps. I'll probably mark some of them once I get back to working on this project. One thing I know for sure is the remaining IC on the bottom is an op-amp. There are also a couple of TO92 devices close to the other side of the heatsink, which we can identify on the bottom by their 3 legs side by side. If I remember correctly, those are 431 devices, but I have to check this as well.

u666sa:
What it says on M12 16 leg chip? Because you diagnose by pulling datasheet on that chip and checking all the voltages that go onto it.

Harry_22:
M12 is the EST.7627A PS monitor with Power Good and Fault Protection.

See also PCB drawing in Paint.NET.
https://drive.google.com/file/d/1ioSKdIbU5OzwVAya7Q1peoBTQO55Dylf/view?usp=sharing

u666sa:
Excellent, on page 2 and 3 there are all the parameters and conditions to check. End result you will know what's making PSU shut down or not start.

Dannyx:
Here's some pictures of the other side of the heatsink - the one opposite the capacitors. There are 3 431 devices here, as well as one BT169D SCR in the middle. You can also see one of the TO220 diodes there. There's a second one behind the transformer.

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