Hi,

I know this is a noob question propably, but I hope you bare with me

I have this cheap 120w 12v psu which I'm using for a project and which I think I stupidly shorted. I cannot find any diagram of the psu by googling, there is label in the pcb "PCB-L120W".

I took the psu out of the project enclosure and because I've removed the metal cover I made sure with screw driver that there is no voltage left at the high voltage capacitor. Afterwards I put the psu back to enclosure to see it didn't fire up anymore. So I think I have accidentally shorted/damaged the possibly PFC ic on the psu with my screwdriver, I know..well better that than a shock anyways... Atleast that ic is propably the most delicant component on that pcb, which could've got damaged.

Unluckily the IC hasn't got any markings, wtf, gj china, only 250 label beneath it .

Because after all this doesn't seem so complicated piece of electronics I thought I'd ask if my options are
a) Buy a new psu, it doesn't cost a lot
b) Feels stupid to buy a psu, because of maybe one failed component. Maybe learn something about it, fix it and enjoy the result. Like is there a way to identify that PFC IC? I don't know a lot about IC's so I'm wondering are these usually close to each other. Like one pfc ic to another pfc ic, pinout, features etc, could it be replaced with another one if it cannot be identified.

DC rails doesn't seem to be shorted, and can't see any other problems. Seems like the AC side of the PSU is working as I succefully metered 230v on many spots. DC side is down.
Thanks for any help even though I understand if help is small

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Take a better picture of the trackside then you can reverse engineer it, there are several 8pin dil smps chips like UC3845 or viper.

 

Thanks for idea Dodgy. Here is the best I could do with my phone camera
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Unfortunately I'm just learning electronics and cannot reverse engineer with my skill set. I know something about diagrams and components and even have made some breadboard stuff. But if I'd make a comparement I'd say I know the letters but I cannot read or write yet
I think I'll have to buy a similar psu and leave this one waiting for future, when I have more skills with electronics. You always need power sources anyway for you projects
I'm much more skilled with IT, computer hw, software etc. If I buy a similar one, any idea if I can de-solder and read/test the chip easily to identify it?
Maybe with some tester like this? Thanks.

 

That tester is for cmos/ttl gate type chips, no good for switchmode chopper chips, .

 

Good info thanks!