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Dead PC: PSU?


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#1 DeathStalker

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Posted 02 July 2010 - 12:26 PM

I built my daughter a computer for Christmas. Last night she had a friend over and they were watching a DVD. The thing just up and quit. When I push the power button nothing happens. I haven't had time to open it up yet but the power cord is plugged it to both the outlet AND the PSU. AM I right in thinking that the PSU suddenly gave way or is there something else I should look for?

Edited by boopme, 02 July 2010 - 01:15 PM.
Moved to Internal hardware~~boopme


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#2 MrBruce1959

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Posted 02 July 2010 - 01:30 PM

Try what I have listed below.


The purpose of this procedure is to bypass the motherboard to test a ATX PSU. Some manufacturers Like Dell have used some non ATX PSUs which have a different pinout for the 20/4 pin connector, please confirm that your PSU is a ATX type before using this procedure.

Caution:
This procedure will involve working with live 12VDC electrical potentials which if handled improperly may lead to electrical shock. Proper precautions should also be taken to prevent electrostatic discharges (ESDs) within the case of the computer. For safety purposes please follow the instructions step by step.

First, shutdown your computer. Then unplug the power cable going into your computer.

Once you have opened the case, touch the metal of the case to discharge any static electricity.

The connector of the PSU which connects to the motherboard is readily recognizable by the number of wires in the bundle. To disconnect it you will need to press on the plastic clip to disengage it and then pull the connector up and away from the motherboard. Please take notice of the location of the locking tab and the notch on the socket of the motherboard, this will only connect one way as it is keyed. This wire bundle will have a memory of the way it has been installed and will want to bend back that direction, you may have to play around with it to find a position that the connector will stay in the same position while you run the test.

Posted Image
www.playtool.com

From the top left to right the pins are 13-24, the bottom from left to right are 1-12.


Please notice that there are PSUs with 24 pin and 20 pin connectors, the location of the green wire in the 24 pin connector is #16, and the green wire in the 20 pin connector is #14. If you look at the connector with socket side facing you and the clip on the top the number one pin will be on the bottom left corner. This makes the pin out for the 24 pin connector from left to right 13-24 on top, and 1-12 on the bottom. The pin out for the 20 pin connector from left to right is 11-20 on top , and 1-10 on the bottom. If you look at the connectors you notice that these are sockets that fit over the pins on the motherboard where the PSU cable attaches, this is where you will place the jumper. For a jumper you will need a piece of solid wire about the size of a paper clip (20-22 awg), preferably a wire with insulation. It will need to be large enough to fit firmly into the socket so that it will not need to be held in place while testing. You are at risk of electrical shock if you are holding the jumper when you power up the PSU. Insert one end of the jumper into the socket of the Green wire, and insert the other end into the socket of any Black wire.

Once the jumper is in place plug the cord back in. If the PSU is working properly the case fans, optical drives, hdds, and LEDs should power up and remain on. I would suggest that you not leave this connected any longer than is necessary for safety purposes.

To reconnect the 20/4 pin connector unplug the power cord, remove the jumper, and reconnect the connector. Take a moment at this time to make sure that nothing has been dislodged inside the case.


More information to help you at this link.

http://www.playtool.com/pages/psucompat/compat.html

Hope this helps.

Kind regards.

Edited by MrBruce1959, 02 July 2010 - 01:32 PM.

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#3 DeathStalker

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Posted 02 July 2010 - 02:08 PM

Wow. NICE technique MrBruce. Thanks a bunch. I'll try that as soon as I get time to open it up.

I love learning tricks like that. My electronic knowledge is as spotty as my software knowledge lol.

#4 MrBruce1959

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Posted 02 July 2010 - 04:03 PM

Not a problem, hope things go well for you.

Good luck! :thumbsup:
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My Career Involves 37 Years as an Electronics Repair Technician, to Which I am Currently Retired From.

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