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PSU Repair-Link

A

AP514

Limp Gawd
Joined
Feb 15, 2006
Messages
484
Hey does anyone have a link to repairing/deep Troubleshooting a PSU ??

I have jumpered my Enermax Liberty 500W and I get good voltage from all of the 3.3v, 5V and 12v pins from power connector. fan turns on PSU but get nothing from computer on power up. I have switched PSU's and computer powers up.....



AP514
 
ok here is the DEAL. I have 3 computers (kids get expensive)

I have 3 Enermax Liberty ELT 500AWT PSU's --- 2 have Crapped out on me...
the Computer will not power up. I took the 3rd working one and put it in the computer and it works. So Mobo troubles are out of Picture.

1) I jumpered the Green to ground on power cable to computer(paper clip method). Fans work on PSU
2) I checked volts on all connectors of powercable get 3.31v, 5.14v, 12.27v ,-11.86v both PSU readings are exactly the same.
3) 12.27v reading on the ATX connectors and PCI cables
4) connected a few fans up (molex) and checked each port (modular) from the PSU..Fans run

Any other tips to figure out what is wrong w/ these seemingly good PSU's ??


AP514
 
AP514 said:
connected a few fans up (molex) and checked each port (modular) from the PSU..Fans run

Any other tips to figure out what is wrong w/ these seemingly good PSU's ??
Click to expand...
You could try loading down each voltage rail a lot more and seeing how the voltages change, compared to a good PSU's. A fan probably consumes no more than about 1/4 amp (they typically draw half their labelled value), or 3W, and it's better to load down each rail with 5-10 amps (resistors, heating elements from old toasters or hair dryers, 12V lightbulbs).

I'd unplug the AC and look carefully inside the PSU for bloated or leaking capacitors and do ohms or diode checks on the output diodes and MOSFETs on the big heatsink closest to all the output wires.
 
bastard great reply...do not bother next time..

Looking for real help not a TROLL........
 
Are your power supplies the Liberties with the brown fixing caulk inside vs. the usual white stuff? If so, that may be your problem. Enermax used a caulk to fix the various pieces internally that ended up turning conductive over time, essentially shorting out parts of the ps's output....killing them.
 
In general if ANY electrolytic caps are showing signs of bulging or leakage then the first thing to do if you want to fix the board is to replace all the electrolytic caps since it's very likely others are bad too.

Having said that I would agree with most people here that given the cost of replacement and the risks that can be posed by a bad PSU it's not usually worth trying to fix them unless they are a weird form factor or something.
 
I already replaced it....kind of a pet project to find out what was the cause.....everyone I talk to say on a PSU that was made in 2005 I got my money out of it...and to Replace all the CAP(capacitors) due to age and the fact they go bad over usage/time.
But im more interested in figure'n out why it is not working (what part went bad) seeing it is passing all the test im putting to it.

AP514
 
Have you tested it with a load applied? Without a load you will not get accurate readings.
 
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