Dell optiplex 980 psu

[dmartins]

Hello ,

I have a lot of Dell H235P-00 with a blown component ,
Can someone help me to identify C125 Component?

I cant find the schematic

Thanks in advance

[stj]

Re: Dell optiplex 980 psu

upload some pictures.

[dmartins]

Re: Dell optiplex 980 psu

Hello ,

Sorry for the late answer , pics posted

[stj]

Re: Dell optiplex 980 psu

that looks familiar to another that goes boom.
the big fet is shorted, the cap is under-rated, the fuseable resistor is burned.
the fuse may be toast and probably some of the driver circuit will be burned.

desolder the cap, the area they print on is still there.

[dmartins]

Re: Dell optiplex 980 psu

I have more or less 15 PSU's all with this burned component ( C125 ),i just wanted to know if someone has the schematic of this psu to know the reference and order this component

[stj]

Re: Dell optiplex 980 psu

you need a lot more than a 2KV ceramic cap.

[Per Hansson]

Re: Dell optiplex 980 psu

This is the threads that stj referenced, please read these before you consider repairing this PSU:

https://www.badcaps.net/forum/showthread.php?t=40726

https://www.badcaps.net/forum/showth...427#post613427

https://www.badcaps.net/forum/showthread.php?t=50864

[SoporteHR]

Re: Dell optiplex 980 psu

Hello dmartins

I found this plane, the C125 indicates that it is 0.01uf x 500V.

If that value is applicable to your power source, check the diagram to see if it corresponds to the physical source of your power.

We remain attentive to your comments and success with your repair.

Greetings.

[stj]

Re: Dell optiplex 980 psu

if that's true they need to be sued - it should be 2KV rated.
anything less is an intentional suicide-design.

[momaka]

Re: Dell optiplex 980 psu

if that's true they need to be sued - it should be 2KV rated.
anything less is an intentional suicide-design.

Looks like the snubber cap for the primary-side winding.

I agree that 500V is too low. But I've also seen other power supplies get along just fine with 1 KV -rated cap. However, those were with a more "classic" RCD (resistor-capacitor-diode) snubber design and not this one... which I've only seen something similar in a PowMax LP-6100 series of PSUs - and it wasn't uncommon for those to blow a primary switching MOSFET. So makes me wonder if HiPro seriously messed up on the design here and if converting this PSU back to a more "normal" RCD design would be possible.