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PS troubleshooting help please

B

bhw752k

n00b
Joined
Jul 3, 2004
Messages
32
Hi, I think I'm having trouble with my power supply. My power supply is an Allied 500W.

Two days ago, I turned on my computer. After about 3 minutes (before I put any load on it), it just shut off suddenly - just like as if there was a power outage, or if someone had pulled the plug. So I started it again. It shut off after about 10 seconds (before Windows could load). I tried numerous times. Sometimes it would shut off while Windows was checking my drives (as a result of prior shutdowns during Windows load) and a couple times it would shut down before Windows could even begin starting. It also shuts down if I wait around in the BIOS screens. After several trials (probably around 10), it actually stayed on, and it stayed on all day. The next day (yesterday) I turned it on in the morning and it was fine all day.

Today, I had trouble with it again. Annoyed, I disconnected it from all my components and hooked up my spare 350W Enermax. Works. I'm using it now.

I got the Allied 500W power supply about 4-5 months ago (it has a 2 year warranty) out of fear that 350W wouldn't be enough for my Athlon 64 system (2 hard drives, 2 optical drives, 2 case fans, 1 Radeon 9700 with floppy connector). What do you think is going on, and what should I do? I think it's sort of odd that I had no problems yesterday...

I should note that my CPU hovers around 38 degrees C, on stock air, at idle. It goes up to about 50 degrees max under load. Mainboard always stays below 30 degrees. Of course, that's just what the BIOS (and SpeedFan) tells me.
 
That allied PSU looks heavily biased towards the ATX 1.2 specs with 52A on the 5v rail, that's way old school, and most likely overkill, I can't think of anyway to get that kind of load on the 5 v line on any kind of reasonable setup, especially these days with the shift of load towards the +12v line. I think you've answered your own question though, it works fine with the enermax, but not with the allied, so either the allied is bad, or it' s entering "protection" mode because it's overloaded. Either way, RMA it and check out the sticky at the top of this forum on choosing a power supply. Good Luck!
 
It sounds like the overload protection is kicking in.

A 350W Enermax can put out more sustained power than a 500W Allied/Deer.
 
Nothing runs like a Deer .............................................hit by a bus ;)
 
Maybe it has a bad solder connection, or a lead under the circuit board is shorting.

I've found that bad solder is usually on a heavy component, like a transformer or heatsink, or something that soaks up lots of heat when soldered (there may be a barrier of rosin between the solder and the wire lead).

Some companies don't trim the leads enough (more often the heavier ones), causing them to short to the case, other leads, or foil traces, but in better PSUs the circuit board is either located far away from the bottom of the case or has a layer of plastic under the circuit board for insulation.
 
with just 20A before being derated for temperature its likely been over taxed
and may well have degraded (why it ran and doesnt anymore)
larrymoencurly example one possible senerio

and as mentioned many Allied are Deer, the worse kind if exaggerated crap supplies

theoretical (never happen)
http://takaman.jp/D/?M=PbQCQbeHdSAgHKiH3UcZAZavHCMZ&english

realworld post spinup & pegged to the floorboard
12A on the +12V

of course if we knock off one third for temperature that works out to the PSU having 13A
and thats likely ar 40C, dropping even more at 50C

its a junk supply and its even too light to make a decent doorstop
 
It's sad when Allied is the best and most reliable of the Foxconn/Deer owned PSU companies, yet still can't build a 500w unit that can outpower a 350w Enermax.

Replace the Allied with something from Fortron/Sparkle, Seasonic, OCZ, Antec, or Zippy and you'll be doing good. Count yourself lucky you'll be ditching the Deer before it has a chance to wreak electrical havoc on the rest of your computer.
 
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