Dell D550P

[bsweasel]

I have a Dell PSU from a Precision 470 workstation. Model D550P-00
P/N DPS-550DB
Dell P/N D1257

550watt. That just clicks when power is applied. No voltage on any of the 12v or 3.3v rails. Visually it looks ok. Doesn't smell burnt. Anyone have any suggestions on where to start looking? The clicking is coming from I think the AC side like its a relay that clicks on, but no output.

[momaka]

Re: Dell D550P

Sounds like one of the output rectifiers may be shorted. Nonetheless, let's start with the basics... Do you have a multimeter? If so, with the PSU unplugged from the computer but plugged in the wall, check the voltage on the 5vsb rail. On a standard ATX connector with standard color-coded wires, this would be the purple wire. Should be 5v or close.
If there is no voltage on the 5vsb rail, the problem is more likely to be either on the primary side or somewhere within the 5vsb circuit. If 5vsb is present, then the problem is more likely to be located on the secondary.

Post some pictures of the inside of the power supply, if possible. Unplug PSU from wall before opening, of course. The large cap(s) may still be charged even after the PSU is unplugged, therefore exercise caution around that area and perhaps even avoid touching anything there for 5-10 minutes.

[bsweasel]

Re: Dell D550P

Well, of course I get around to testing, and it PSU starts working, now I can't get it to fail. So apparently this will have to resume when it decides to stop working again.

[seanc]

Re: Dell D550P

I had a similar Dell PSU to this, it had partially burned itself up inside, around one of the big coils. Stole its fans and threw it out.

I know everell would have been able to fix it

[ratdude747]

Re: Dell D550P

i forgot who did it (newbie2?), but there was a guy who made a gutless l&c into a decent unit... he had been powering a pentium d off of it... LOL! and that was before he fixed it.

some people just have too much time...