Psu fried, high voltages

April 23, 2012 at 13:19:35
Specs: Windows vista

I have a pc and the screen stopped turning on. I tried it on another pc and it worked so I tested the psu (lite on pe5251-7) and got the following voltages

12=off the chart

So i tested the psu in my other computer and the voltages were fine (lite on ps-5301-08hf) and the voltages were spot on, so I though great, I found the problem. I put the working psu in the computer and switched it on. It didn't boot. I couldn't understand it so checked the voltages again. They now read the same as the old psu, way over the top.

I'm not sure what to do now as I think the motherboard may be shot and frying the psu's.

The monitor stopped working before so I pulled out the video card and run it off the motherboard itself and it worked again so I'm wondering if the old psu fried the video card then the motherboard and now in turn that has fried my other psu.

Hope I have given all the info that is needed to help me. Any help is much appreciated.


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April 23, 2012 at 13:45:52
What about the rest of the system specs? Or an explanation of how you are checking voltages? With a multimeter?

The 250W only has 15A on the +12v rail, the 300W only has 19A on the +12v. They appear to be from older HP systems? Both of them lack the specs to run a modern system, especially if it's been upgraded with any type of gaming graphics card.

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April 23, 2012 at 13:53:03

It is an acre aspire m1640, CPU e4700 intel core 2 duo, 2gb ddr2 ram, 320gb hdd and it did have a nvidia GeForce 9300ge before I took it out. It is totally standard in that respect, as bought.

I checked the voltages with a voltmeter on the working psu just before installing it and all was good, immediately after installing it the voltages were high and it didn't boot.

Last time it worked I was controlling it via team viewer and opened the DVD tray then got disconnected and there was a blue screen on it with white writing. After that it hasn't booted since.



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April 23, 2012 at 14:47:47
Higher than normal voltages will fry components. Don't use that power supply. You need to check the motherboard, cards, drives and memory. A shorted part can damage any part connected.

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April 23, 2012 at 17:59:32
If the 12VDC is correct when in a unit and not correct in a tester then I'd suspect the tester is faulty.

Text, talk, drive...CRASH.

Hang up and drive @#$%^^

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April 23, 2012 at 23:01:56
I have tested it in situe and still get the high readings. It worked in my other pc and the monitor powered up and the readings were fine. As soon as it was put in this PC the readings had changed to match that of the broke one and they are exactly the same when connected to motherboard and hdd etc.

There must be a short somewhere but has anyone any ideas where and what I might look for as it developed on its own as I didn't open the case to add anything.

Could the psu have just gone wrong on its own then fried the video card and motherboard as a result and so I would need new ones?

Thanks again


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April 24, 2012 at 13:16:15
Just tried with only the motherboard plugged in and got no beeps so looks like new mb and psu. Oh well

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