Is there something wrong with my power supply?

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iamlawrencev

iamlawrencev

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May 2, 2014
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A friend of mine sent me a computer to fix. The problem with it is that it powers off randomly. When it powers off there's no blue screen or any warning whatsoever. I then replaced it's power supply with my own and did a clean-up of it (reformat, install new OS, etc.) and left it running for about 5 hours and it was ok. I put back the suspect power supply and left it running overnight. When I woke up it was off and I checked the event logs and it had an unexpected shutdown.

I checked the voltages using CPUID's HW Monitor and here it is:

CPU VCore = 1.200V
VIN1 = 3.040V
+3.3V = 3.296V
+12V = 11.904V
-12V = -8.640V
-5V = 4.480V
+5V VCCH = 5.053V
VBAT = 2.560V

Is there any problem with the power supply? I'm not really knowledgeable about electricity and voltages in the computer so I'm hoping you guys could help me. Thanks in advance. :)
 
Solution
emdea22
Its 99% the PSU. Get a brand PSU (or just go Seasonic or Antec to be 100% safe)
Honestly those crappy psu's should be banned and the importer should be fined a hefty fee; they are fire hazards that can not only kill computer components but even cause a house fires
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emdea22

emdea22

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Oct 25, 2011
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This is caused by 2 things mainly:
1. PSU dying
2. Motherboard overheating and shutting down due to thermal protection on power delivery area

It can also be caused by a short circuit or power fluctuations (or drops) on your electrical network but depending on where you are those things are far less common.
 
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iamlawrencev

iamlawrencev

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May 2, 2014
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It's an obscure brand from China that's well-known in our country because it's cheap but the quality of their products are also well-known to be poor. About 3-4 years old.



Yeah it's probably the PSU, I just want to know if there might be any other causes because I don't want to recommend buying another PSU if it isn't the cause of the problem.

I wouldn't worry about overheating since I've been running Prime95 to ramp up CPU usage to 100% for about 2 hours now and temps are stable around 70C. Power fluctuations are also not the cause since I have my own computer and the problem computer connected to the same AVR and they were both left on overnight. Only the problem computer shut down.

So given these facts is the problem really the PSU? Do you guys think it would be ok to recommend buying another PSU?
 
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emdea22

emdea22

Distinguished
Oct 25, 2011
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20,460
Its 99% the PSU. Get a brand PSU (or just go Seasonic or Antec to be 100% safe)
Honestly those crappy psu's should be banned and the importer should be fined a hefty fee; they are fire hazards that can not only kill computer components but even cause a house fires
 
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