Corsair hx620w power on until PG says the opposite

[Francesc V.]

Hi:

I am trying to repair this SMPS, and I see that it powers up (let say for 1-2 secs) and then turns off.

For this short period I see the 12V,5V,3.3V,5Vstby on........along with the Power Good one. Then PG goes off and then the rest do the same.

The chip that decides it is a HY510N.

The voltages that I am reading on the pins are.

V12 - 11.42V
V5 - 4.98V
V3 - 2.57
PGI - 1.15V

Any idea what to look at?

Regards,
Francesc

[PeteS in CA]

Re: Corsair hx620w power on until PG says the opposite

Your 3.3V seems to be well out of regulation, so PG should be low.

[Francesc V.]

Re: Corsair hx620w power on until PG says the opposite

Starting to check the 3.3V rail, then. :-)

[Francesc V.]

Re: Corsair hx620w power on until PG says the opposite

Well.......getting crazy these days to troubleshoot the issue.......when indeed there was no issue.

This bloddy SMPS requires from LOAD......otherwise it stops.

So SMPS recovered from the junk box.

Regards,
Francesc.

[PeteS in CA]

Re: Corsair hx620w power on until PG says the opposite

Some power supplies need to be loaded for all outputs to be in regulation.

[Francesc V.]

Re: Corsair hx620w power on until PG says the opposite

Thank you PeteS. Happy to have learnt something new from this experience :-)

Regards,
Francesc.