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help with possibly broke PSU

post #1 of 5
10/5/12 at 9:05am
Thread Starter 
Hi. So, my friend called me a few days ago to ask me about buying a new PSU, because his computer wouldnt turn on. Today I visited him, and he asked me to take a look at it. When the Power button is pressed, the computers turns on for a sec. and then back off. After that you have to take out the power chord before it'll turn on for a sec. again. So what I did was, unplug the 24-pin and PCI-e cables, and then use the trick where you take a metal wire and connect the green wire and one of the black ones, to hotwire the PSU, to make sure that it was a PSU related issue. Same thing happens, when the connection is made, it turns on for a sec. and then off, until I break the connection and connect them again.
So Im thinking, a loose connection somewhere in the 24-pin cable. Am I right ? If so, how can we fix it, and if not, do you have any ideas what else it could be?
PhANTOM
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PhANTOM
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post #2 of 5
10/5/12 at 9:15am
That is a faulty overload safety. All modern PSUs have an overload safety to protect the PSU and other hardware from damage in the event of a short. Though a faulty overload safety will trip even under normal load. The reason it works when you break the connection is that it resets the safety. I have seen many a PSU suffer from this. There is a slight chance that you may be able to fix it but it is rather unlikely. Try opening it up and blowing the dust out, if you are lucky it is just a conductive piece of dust in it that is throwing the safety. If that doesn't work the safety is often on a small vertical break-out board connected to the main PCB you might be able to fix it.
Sandy Thunder
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QuickSilver X1
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Sandy Thunder
(17 items)
 
QuickSilver X1
(15 items)
  		 
CPUMotherboardGraphicsRAM
i7-3930k C1 4.6GHz @1.344v Sabertooth X79 2x EVGA GTX 560 Ti SC SLI 900/2106 Dominator 1866 16GB 9-10-9-27 
Hard DriveHard DriveCoolingOS
Crucial M4 64GB 'Cuda 320GB H100 Pull Win 7 Pro x64 
MonitorMonitorMonitorKeyboard
Asus VE198D 19" Samsung 920NW 19" Samsung 906BW 19" Apple Aluminum Wired 
PowerCaseMouseMouse Pad
Corsair HX850M Carbide 400R R.A.T. 7 Razer Kabuto 
Audio
Monsoon MM-700 
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CPUMotherboardGraphicsRAM
Phenom II x6 1090T BE Sabertooth 990FX Radeon HD 5770 1GB Corsair Veangence Blue 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 1TB  Lite ON 16x DVD-R/RW ThermalRight Silver Arrow Windows 7 Professional 64 bit 
MonitorKeyboardPowerCase
Syncmaster 921BW 19" & Syncmaster 965 19" and S... Apple aluminum wired keyboard Corsair TX650 Silverstone TJ05 with window and thermal contro... 
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logitech mx air None Monsoon MM-700 
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post #3 of 5
10/5/12 at 9:15am
just replace it
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post #4 of 5
10/5/12 at 1:19pm
Thread Starter 
Quote:
Originally Posted by DSP1 View Post

That is a faulty overload safety. All modern PSUs have an overload safety to protect the PSU and other hardware from damage in the event of a short. Though a faulty overload safety will trip even under normal load. The reason it works when you break the connection is that it resets the safety. I have seen many a PSU suffer from this. There is a slight chance that you may be able to fix it but it is rather unlikely. Try opening it up and blowing the dust out, if you are lucky it is just a conductive piece of dust in it that is throwing the safety. If that doesn't work the safety is often on a small vertical break-out board connected to the main PCB you might be able to fix it.

That sounds very likely. You say that I might be able to fix the safety, other than blowing on it. Can you elaborate?
PhANTOM
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KeyboardPowerCaseMouse
Steelseries G6v2 Silverstone Strider Plus 850W CM HAF-X Roccat Kone[+] 
Audio
SB X-Fi Titanium HD 
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PhANTOM
(15 items)
  		  
CPUMotherboardGraphicsRAM
Core i7 2600k Gigabyte Z68X-UD3P Gainward GTX 570 Phantom SLi Kingston HyperX Blu 8 GB 1600MHz 
Hard DriveHard DriveOSMonitor
Samsung 840 500 GB SSD Samsung Spinpoint F3 1TB Windows 7 Ultimate 64bit Dell U2311h 
KeyboardPowerCaseMouse
Steelseries G6v2 Silverstone Strider Plus 850W CM HAF-X Roccat Kone[+] 
Audio
SB X-Fi Titanium HD 
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post #5 of 5
10/5/12 at 1:41pm
Return it, some protection is getting triggered for no apparent reason.... it's a defective unit.
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