How to test the psu with multimeter

October 27, 2010 at 17:29:55
Specs: Windows Vista, 2.001 GHz / 2045 MB
In what cables, where, when, and all that stuff.

I got a problem with my first built pc and i got no idea of what happened, and before test the mobo or the cpu, i want to check the psu first.

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October 27, 2010 at 18:09:42
Did the system ever work? Or did you just assemble it?

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October 27, 2010 at 18:20:50
i did asssemble it, the first time i boot it, the all the fans were running, but 10 seconds later, it shut down, and ever turned up and i dont know if its the mobo, or the cpu or the psu or what.

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October 27, 2010 at 18:35:16
In other words, you installed all the hardware in the case without benchtesting it 1st? Did you get a decent quality name brand power supply? Good PSUs start at about $50 & go up from there.

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October 27, 2010 at 18:39:35
the psu i have for the pc is:

COOLER MASTER Silent Pro M600 RS-600-AMBA-D3

how do i check if the psu is working?

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October 28, 2010 at 07:57:12
I doubt the power supply is the problem but if you want to check voltages, start by unplugging ALL the connectors from the motherboard, HDDs, etc. Then you'll need to use a U-shaped jumper wire (paperclip is commonly used) on the main ATX plug to connect the green wire to any ground (black) wire. This is done to bypass the motherboard & case power button. Generally if the cooling fan works, the PSU is good, but not always.

To check voltages, all you need to do is probe the plugs/wires using your multimeter. Obviously the black probe goes to ground (any black wire) & the red probe will be used to check voltages. Yellow = +12v, Red = +5v, Orange = +3.3v. Tolerance = 5% +/-.

Even if the voltages all test within spec, it doesn't necessarily mean the PSU is capable of supplying the required amperages. Unforunately, there is no easy way to check amperage because amps will vary underload. PSU load testing equipment costs 1000's of dollars.

BTW, do NOT run the PSU for very long using the above method. A few minutes should be OK but a PSU can be damaged when run for extended periods under no-load conditions.

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October 28, 2010 at 14:39:29
i checked the green and black wire, turn on the psu and nothing happened.

i checked the voltage in the red, orange, blue wires, and there's no reading.

i conclude, in base of this, that something happened to the psu.

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October 28, 2010 at 15:51:16
thanks for the post jam

what i did is check the green and a black (ground) wires

my cooler master silent pro 600w was DEATH. it has no power from the green wire.

instead, one of my old psu was still alive, it read 9.73V of the 10V on the green wire.

later, i bought a generic 650w psu. i checked it and read 5.00V on the green wire.

when i plug it on the mobo, the standby LED turned on! and i turned on the whole mobo and beeped because it hasn't ram.

but i'm happy i found that the problem was the psu!!!


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