Hello!
Well, i decided to try to better understand how a PC psu is built, and since i had an dell SFF with a bad psu sitting, i thought that would be a good project. Turns out it may not be.
I opened it up, and found that there have been black dust expelled from the W7NK90Z MOSFET (its completely shorted when measured out of circuit), and also that the top of a mysterious IC on a "daughterboard" had blown of. (see picture)
For starters, i cannot find any info about the CL2181 IC, what it does or how it works, neither any replacement, well i found replacements in china though..
I did some poking on the little daugtherboard and found that the large mosfet is connected to the IC:
ICpin1 = source
ICpin3 = gate
Also found that a resistor called R301 (cant see the value, either there were no printed from the start, or it have gone missing in this) is open circuit. The rest seem OK though.
The question is. Can this be repaired? What else to look for? What value of resistance to replace the R301 with? Can the CL2181 be replaced with something else, more widely available?
It would be a fun and a good learning exercise to do this repair, but maybe im in over my head. Also it would save a nice computer, that has less value than a replacement PSU on ebay
Any help and input in this would be greatly appreciated.
Thank you