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Dell desktop PSU troubleshooting

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eagle1109

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Hi,

I'm working on another Dell 240W desktop PSU.

I'm using the lamp limiter, first test, the lamp was flickering, then the lamp lighted steady, then I heard something popping, of course it's a component got fried.

And did another test today and the lamp didn't light. I shorted the green wire to the ground to boot up the PSU and anyway it's not working.
So, I unscrew the PCB and checked the back of the PCB and found this:

20230118_155542 - Copy.jpg




It's this little guy:

20230118_155659 - Copy.jpg


Also the two marked MOSFETs, measured short with the left and right pins. So I guess the source is shorted, could they be broken ?
Then other opposite MOSFETs measured OK, just the 3rd pin which could be connected to the ground I guess.
 

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