PSU died out need help with further diagnosis and recommendations

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xenohart

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Apr 13, 2015
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Sittuation:
Late last night my pc turned itself off and i smelt a faint electrical burn smell i immediately unplugged my machine and looked for damage. i couldn't see any damage visible so i assumed it was my PSU (corsair cx750) which i heard are possibly faulty. had it for about three years and was having some bsod issues which i thought was ram related replaced my ram and was doing fine until my psu killed itself last night. This morning i dusted out my whole pc believing it may be the issue and instead of starting up like it was last night even after the shutdown it now has no response from giving it power no light on my mobo. Looking for some insight and possible PSU recommendation

specs:
PSU: corsair cx750 (known to be faulty)
CUP: I7 quad core 3770? (Been a while)
MoBo: Asus z77 saber tooth
GPU: EVGA GeForce gtx 457801
RAM: 2gb sticks of 8gb corsair vengeance

Edit(sorry about any errors im on mobile)

 
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xenohart

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Apr 13, 2015
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Yeah this is what i was looking at looks like a solid PSU if anybody can offer insight to why after i dusted out my fans and PC that the PSU would stop working or was it inconsequential and it booting up was a fluke and it was done for anyway?

 
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RobWHS

RobWHS

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Jun 3, 2014
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It's rock solid and worth every penny. The 10 year warranty is a good selling point too.

Not sure what may have happened regarding the dust. Although It has been know to kill components.
Heat and dust. two of PC's biggest enemies.
 
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xenohart

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Apr 13, 2015
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OK so i decided to do the paperclip test instead of just putting it off as the PSU without further inspection i did it correctly and the fan started spinning only a little bit though then it slowed down started back up again and slowed and repeated this until i unplugged it please help it seems i have gone braindead to most of what i used to know about PCs when i built this one

EDIT: I can still smell the strange electrical burn smell coming from inside of the PSU when it starts up so the source of the smell is definately the PSU
 
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giantbucket

giantbucket

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Nov 17, 2013
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somewhere it probably says "no user serviceable parts inside", so even if you take it apart, what are you gonna do about it?

it could be a capacitor that's heading for the door. you could buy a replacement for $5 on eBay and solder it back in assuming you have the tools. it could be other parts, too. if it can barely spin a fan, though, it's most likely the core 12V rail and if that's not working then nothing is working. best case - new capacitor. worst case - new power supply.
 
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xenohart

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Apr 13, 2015
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Thank you very much for your reply is it possible that it damaged any of my other components like my motherboard? ive come to terms with purchasing a new PSU but i didnt turn on my pc at all after the incident
 
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giantbucket

giantbucket

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anything is possible, but if it failed quietly then it's unlikely that it hosed anything else in the process. it sounds like it couldn't muster enough power for much of anything, so frying mobo / cpu parts is not that likely.

depending on what kinds of parts you have kicking around, you could continue the paperclip test and connect some kind of a load to it. maybe some 12V bulbs, like the ones in your car or motorbike. they're anywhere from 20W to 85W for the common ones, which is a simple load for the power supply to try to drive. and you get visual feedback whether things are on and stable, or whimpering.
 
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xenohart

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Apr 13, 2015
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ok now after letting the psu run for abot 8 minutes with the paper clip in it. it the fan is now spinning fast like normal this confuses me greatly (the electrical burn smell is still coming from the PSU)


 
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RobWHS

RobWHS

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Jun 3, 2014
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Mate, Kudos for trying but go and purchase another PSU or you may end up doing more damage if the PSU is still connected to the mobo......Or even electrocuted.......Or dead.
 
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