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Is my power supply totally dead? Can it be saved at all?


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#1 Kaljinyu

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Posted 29 November 2012 - 07:02 PM

Alright, so I walk into my room full of computers to find that one of them isn't on. Did someone turn it off or something? Then I check the indicator light behind it. Even though the computer is plugged in, the light isn't on. Now I'm scared. That almost always means it's dead.

I don't think the socket is bad because other things work fine in it when I plug them in. But here's something I noticed. When I switch the voltage rating from 115 to 230 (I know it's not safe, which is why I didn't do it for very long), the indicator light comes on, but it only flashes. Is that a sign that my power supply might be salvageable?

EDIT: As for specs of the power supply, what do you need? The brand name? The fact that it's a 115/230 switch?


EDIT 2: I should also point out, when I unplug the power supply entirely, but leave the voltage on 115, the indicator light comes on as well. I guess that rules out switching it to 230 as a solution. So what might that mean? What does the fact that my power supply's indicator light won't come on unless I unplug it entirely, in which case it only flashes, mean?

Edited by Kaljinyu, 30 November 2012 - 12:14 PM.


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#2 Jan Benedict

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Posted 01 December 2012 - 03:11 AM

full computer specs please :D

#3 dc3

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Posted 01 December 2012 - 12:39 PM

Is the LED green or yellow?

If the LED is green try this.
Unplug the power cord from the wall receptacle.

Make sure that the voltage switch is set for the proper voltage.

Press the power on button and hold it down for thirty seconds.

Plug the PSU back in and see if the green LED is on but not flashing.

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#4 Kaljinyu

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Posted 02 December 2012 - 02:13 PM

Should I hold down the power button still as I plug it in?

#5 dc3

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Posted 02 December 2012 - 04:11 PM

Is the LED green or yellow?

If the LED is green try this.

1) Unplug the power cord from the wall receptacle.

2) Make sure that the voltage switch is set for the proper voltage.

3) Press the power on button and hold it down for thirty seconds.

4) Plug the PSU back in and see if the green LED is on but not flashing.




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#6 Kaljinyu

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Posted 03 December 2012 - 11:47 PM

I mean when I'm plugging the power supply back in during the last step.

#7 dc3

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Posted 04 December 2012 - 08:20 AM

No. Once the power cord is plugged back in the LED should turn on and should be a solid (not blinking) green light.

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#8 Kaljinyu

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Posted 06 December 2012 - 07:16 AM

Hmmmmm... no dice. Didn't work. Is that all that can be done? Is it definitely dead?

#9 dc3

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Posted 06 December 2012 - 09:33 AM

There is one last thing to try, this would be to make sure that the problem isn't with the motherboard. When you press the power button it short the to header pins on the motherboard which initiates the PSU. Using the instructions below you can bypass the motherboard to be sure that it isn't causing the problem.



Testing PSU

The purpose of this procedure is to bypass the motherboard to test the PSU.

When a computer begins the boot process the motherboard initiates the start up of the PSU. Because of this it is difficult to determine whether the problem is with the motherboard or the PSU when a computer shows no signs of starting up. The purpose of the procedure is to determine if the problem is with the motherboard or the PSU. For safety purposes please follow the instructions step by step.

This test is for ATX PSUs. Some manufacturers use non-ATX PSUs with 20/24 pin connectors that do not have the same pinout as a ATX PSU.

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

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.

Family and loved ones will always be a priority in my daily life.  You never know when one will leave you.

 

 

 

 





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