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Faulty Power supply ... twice!?

Last response: in Components
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February 13, 2014 10:02:46 AM

So i got for a friend a machine made up with an asrok mother, a bulldozer 6300 fx, 2 gbs of ram (we will boost that up when i go to the US), 7850 and a sata 3 hdd..
So we got it all up and when we hit the power button the cpu kicks in but suddently it shuts off..
Only the blue led on the front panel would light up after that. We couldnt turn it on. Turns out it was a faulty psu. We tried the paperclip trick and it didnt turn on.
So he goes and changes it cos of waranty. Next we install it and it works flawlessly. 1 Day after it breaks again... Same sympthoms . The psu is a 500w Sentey and both psus where the same model same brand.
Could it be some component damaging the psu , or is it just a bad psu batch the shop owner got??
Thanks for your time.

More about : faulty power supply

a c 715 ) Power supply
February 13, 2014 10:07:43 AM

Hard to say but make sure no shorts but points to bad PSU's.
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February 13, 2014 10:12:35 AM

rolli59 said:
Hard to say but make sure no shorts but points to bad PSU's.


As of shorts, the case has the motherboard lifted by the holes where the screws go. The holes are like pushed apart from the case so it doesnt touch any components on the bottom. Every sata and molex cable are carefully placed not to collide with any metallic thing. As the mother and every component still works fine i really think its the psu, cos if not something else should have broken... right??
Thanks for your answer :) 
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February 13, 2014 10:13:10 AM

do you have any spare PSUs? try a different PSU if you can. I dont know much about senty PSU's but personally I only use Antec, Seasonic, Corsair, and the high end EVGA units as they tend to be better built. there is a chance you got 2 DOA units in a row
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February 13, 2014 10:16:48 AM

frank the tank said:
do you have any spare PSUs? try a different PSU if you can. I dont know much about senty PSU's but personally I only use Antec, Seasonic, Corsair, and the high end EVGA units as they tend to be better built. there is a chance you got 2 DOA units in a row


Thanks, i do have a spare psu here .. i might give it a try.. but GUESS WHAT.. ITS ALSO SENTEY lol hahah
from my last build i spared the generic psu that came with the case and used a coolermaster.. it was a decent decision now that im aware of sentey psus ...
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February 13, 2014 10:25:45 AM

rolli59 said:
Sentey http://www.realhardtechx.com/index_archivos/Page29012.h...
Those raised areas are the only thing or are there standoffs?


http://www.sentey.com/en/cs1-1410-plus
Thats the case.. but ours instead of getting the standoffs we got only screws and the places where the screws go are like pushed upwards so it doesnt short. and no metallic pins on the backwards of the mother touch the case im sure of that.. its clearly seen that the mother is lifted from all contact points..
Also this new psu lasted 12 hours.. i dont believe a circuit making short would last more than a second, at least from my little knowledge of electronics :) 
Thanks again for your support.
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February 13, 2014 10:35:39 AM

Its a BRP-500W psu from sentey
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a c 715 ) Power supply
February 13, 2014 10:36:38 AM

Yep typical for extreme budget cases. Many modern PSU's have short protection and will not run not sure about your Sentey. I am surprised though that two PSU's go right after each other and could be motherboards fault. You would know if you tried another brand.
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February 13, 2014 10:38:57 AM

But the paperclip trick makes the PSU run without even needing the motherboard... that didnt make the psu work with the first one :S
Now i didnt try it out with this one but i will and surely it wont work either :S
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a c 715 ) Power supply
February 13, 2014 10:44:22 AM

That will tell you.
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February 13, 2014 11:32:50 AM

So my real question is : Can a psu break because of short 12 hours after assembled??
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a c 715 ) Power supply
February 13, 2014 11:38:43 AM

The BRP500 unit is an old design with low output on the +12 volts or 318watts= 26.5 amps split over two max 15 amp rails. I would say the units are loosing a rail most likely from high peak loads on one of the +12 volt rails. Modern 500watts unit deliver well over 30amps on the + 12 volts many over 400watts or 34 amps+.
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February 13, 2014 11:56:49 AM

rolli59 said:
The BRP500 unit is an old design with low output on the +12 volts or 318watts= 26.5 amps split over two max 15 amp rails. I would say the units are loosing a rail most likely from high peak loads on one of the +12 volt rails. Modern 500watts unit deliver well over 30amps on the + 12 volts many over 400watts or 34 amps+.


Actually the first psu went off without even the graphics card pugged in :S just cpu ram and an HDD thats all.
Could it still be because of missing 12v rail amp??
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a c 715 ) Power supply
February 13, 2014 11:59:00 AM

It can be but more likely was faulty to begin with.
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February 13, 2014 12:08:46 PM

We will get a coolermaster 500W extreme tomorrow and finally conclude with the problem.. i hope !
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a c 715 ) Power supply
February 13, 2014 12:10:18 PM

The CM extreme power is a bad unit.
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February 13, 2014 12:19:10 PM

? i have a CM with a 7870 crossfire and its still working.. 4 years of use right now.
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February 13, 2014 12:29:05 PM

On a psu calculator it told me i actually only need 320 watts to have the whole system running which should be more than enough for this psu.
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a c 715 ) Power supply
February 13, 2014 12:32:02 PM

Yes it will run it. Reliability or stability is the issue.
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February 13, 2014 12:59:16 PM

Ok so we removed the PSU and tested it with the paper clip... what the hell. it worked. So it clearly that it is
1) A psu problem where the psu isnt providing enough power
2) A motherboard problem causes it to fuck up
3) No idea... really .
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a c 715 ) Power supply
February 13, 2014 3:19:53 PM

It can be that a bad PSU in the beginning started the board failing, so if you can try another PSU and still no go then most likely the board.
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February 13, 2014 3:22:05 PM

rolli59 said:
It can be that a bad PSU in the beginning started the board failing, so if you can try another PSU and still no go then most likely the board.


Yeah, still we got the same problem with both PSUs . only a 12 hour difference between one and another and the problem that the latest one works on its own but not attached up to the system.
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a c 715 ) Power supply
February 13, 2014 3:26:05 PM

masterdam17 said:
rolli59 said:
It can be that a bad PSU in the beginning started the board failing, so if you can try another PSU and still no go then most likely the board.


Yeah, still we got the same problem with both PSUs . only a 12 hour difference between one and another and the problem that the latest one works on its own but not attached up to the system.


Basically means that the system does not work, I have actually had a quality PSU fail to run a system even after passing the PC test so it is just an indication.
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February 13, 2014 3:41:56 PM

So then it can still be a psu problem , still if the PC test works.. That cheers me up at least :) 
Thanks for your responses youve been very helpfull.
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a c 715 ) Power supply
February 13, 2014 3:47:24 PM

Trouble shooting requires patience and I am very lucky having 4 running systems in the home plus always a spare PSU and some other bits so it is a little simpler for me swapping parts between systems in case of problems.
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February 14, 2014 4:02:21 PM

Ok so we got the coolermaster and tested it out... It didnt work. What the hell. Now we are totally lost and will send the PC to the place where we bought all the parts to check what is causing the problem.
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a c 715 ) Power supply
February 14, 2014 4:27:30 PM

Most likely motherboard issue.
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February 16, 2014 11:34:55 AM

if you are going to get a CoolerMaster unit ONLY GET THE V series units. those are the good ones. i would check out the Seasonic G series units if you want a god low powered unit.
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