PSU AT Delta DPS-200-PB-8 half voltage.

[Franchute13]

HI!.

I want to repair this AT PSU.
Sometimes it works well for a few minutes. Other times it does not start well.
When it fails, the voltages fall almost in half.
+ 12v -> +5,5v
+ 5V -> +2.8v
When it fails, the PG goes crazy and falls to 0V.
I was already measuring the capacitors and they seem to be all right.
Any suggestions that may be failing?

Greetings and thanks.

[R_J]

Re: PSU AT Delta DPS-200-PB-8 half voltage.

I would replace any small electrolytic caps in the primary (0.47-47µf around 50V), I don't know how you measured the caps but those usually cause problems and are over looked.

[CapLeaker]

Re: PSU AT Delta DPS-200-PB-8 half voltage.

sounds like a problem I ran before on a different PSU. There was a small cap near a heat sink that was bad in the feedback circuit.

[Franchute13]

Re: PSU AT Delta DPS-200-PB-8 half voltage.

Hi.

Thanks for answering. This weekend I am going to change the small capacitors of the primary.
Attached image of the power source.

Greetings.

[CapLeaker]

Re: PSU AT Delta DPS-200-PB-8 half voltage.

Check the small caps in the secondary too. The feedback starts at the secondary.

[Franchute13]

Re: PSU AT Delta DPS-200-PB-8 half voltage.

Hello!

Change all the electrolytic and the problem persists.
Any other component to check? what do you think?

regards