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- How to test a power supply?
- Doug Kanter
January 17, 2006, 8:24 pm
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supplies last week. Now, I need to confirm the problem really is the power
supply. I have a computer that simply doesn't power up. I've tested the
front panel switch, and the cord's fine, too. I've unplugged the power
connector from the mother board. Which wires do I have to short in order to
simulate the power switch being pressed?
The power supply is a Power Man IPS-1805V.
Re: How to test a power supply?
On Tue, 17 Jan 2006 22:15:28 GMT, "Doug Kanter"
It's not that simple.
Pin 14, PS-On shorted to a ground (like a black wire) is the
mechanism to turn one on BUT some PSU do not have internal
rail loading so they require a load to turn on... might
barely stutter a fan if one were connected but need at least
a drive connected, typically the manufacturers spec 2A on 5V
rail as the minimal load.
There's nothing wrong with a 180W supply if that's all the
system needs, and if it's a decent quality unit. In fact
the typical mATX supply is only good for about 200W so if
you found one rated for more, it's typically a sign the
manufacturer is dishonest, not that the PSU is worth higher
rating. In other systems, like older Compaqs, the PSU may
not be rated very high- sometimes even as low as 70-90W, but
they were very high quality for their wattage and might
outperform some of today's so-called 400W generics (like
Raidmax or Deer).
It might just be junk though, which would make the eventual
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