PC power supply

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PC power supply

Postby hohocc » Sat Dec 08, 2012 6:48 pm

Having looked at Bruces video, and several others I have got myself a Compaq PDP-123P PC power supply. This does not have an on/off switch, since the wall socket it plugs into does have a switch this did not seem like it could be a problem.
I've separated the wires by colour, bundled all black (GND) wires together, and all yellow (+12V) together, and hooked the green (PS-ON) to a black (GND). When I turn on the power at the wall the fan does not start so I am lead to believe there is nobody home at this point!
There is a grey wire, a post on another forum suggested this is "power ok", and the poster said it needs to be connected to ground OR 5V red wire (he wasn't sure which!), so I'm wondering about this.
Also some videos show a white cube resistor (20W, some apparently use several of these) being connected to 5V red and Black ground wires to provide a load on the 5V circuit.
No smoke has been released at this point so it can't be too major a problem!
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Re: PC power supply

Postby AshleyB32 » Mon Dec 10, 2012 12:16 am

you need to attach the power on lead to ground, witch is pin 14 on a 20pin plug on the power supply the wire should be either green or grey, have a look here if you having troubles
http://www.gideontech.com/content/articles/196/1
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Re: PC power supply

Postby hohocc » Mon Dec 10, 2012 10:54 pm

Thanks Ashley, you seem to provide answers to most of my questions! Much appreciated, will give it a go and see how I get on.
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Re: PC power supply

Postby hohocc » Wed Jan 23, 2013 10:53 pm

Back on this little project after the xmas madness.
Put a multimeter on the yellow and black wires and it has a voltage of 0.582V rather than the 12 I expected! Am I correct to conclude the power supply is stuffed, which would explain the cheap (free) price I paid for it?
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Re: PC power supply

Postby AshleyB32 » Wed Jan 23, 2013 11:55 pm

when you power on the power supply dose the fan in the back of it run ?
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Re: PC power supply

Postby cynr100 » Thu Jan 24, 2013 3:54 am

No fan running on power up is the best indicator, chuck that one and find another.
Find a 2nd hand PC shop and offer $10-15 for one they can prove works. Save you a lot of grief.
Not enough time in the day for all my crazy ideas, I'm not slow, I'm just pacing myself
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Re: PC power supply

Postby hohocc » Fri Jan 25, 2013 3:21 am

The fan is indeed dead as a dead thing so will grab another one!
Thanks!
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Re: PC power supply

Postby hohocc » Mon Jan 28, 2013 7:09 am

Got another power supply from the local computer shop, this one goes like a good one so did all that the video showed and all's well.
From talking to the guy at the computer shop I was apparently doing him a favour taking a couple of them away, they are no use to him and the fees to dump them are pretty big. More than happy to help!
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Re: PC power supply

Postby cynr100 » Mon Jan 28, 2013 9:02 am

:D
Not enough time in the day for all my crazy ideas, I'm not slow, I'm just pacing myself
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