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be quiet Dark power pro 6 pc wont boot problem

post #1 of 4
Thread Starter 
Hey!

I got my friends old Be Quiet because he said it did not work in his new computer but in the old it did.

Well i decided to test the psu but as i tought, it didnt work. The pc starts but wont boot up. Normally i hear a beep when starting pc up, now i didnt hear anything.

I have some electronics knowledge so i measured the voltage from the pins after shorting the green wire to ground. The voltages were within ranges.
I also measured the atx connector and the extra power for the cpu while plugged into motherboard and computer turned on. Still the voltages were normal.

I stripped everything else of the motherboard except cpu and the two connectors from the psu in case of faulty hardware but still no luck. Also at this point i tried also my old psu and the pc worked fine.

The product has lost it warranty because of prevoriously broken seals at the psu case.

Any tips what next?
post #2 of 4
Welcome to OCN smile.gif

When you short the green wire with the black wire, does the PSU actually start? (I'm guessing yes since you were able to measure voltages).

If the voltages are within spec, it could be physical damage. Inspect the 24-pin & 4/8-pin connectors and check for signs of breakage, missing pins, loose connections...etc.
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TheSadFlute
(16 items)
 
DyingHeart
(17 items)
 
 
CPUMotherboardGraphicsRAM
i7-6700K TUF Sabertooth MSI 1080 Ti 16GB 2400MHz C15 
Hard DriveHard DriveHard DriveCooling
Corsair 480GB LE 3TB WD Green Sammy 500GB 850 EVO H100i 
OSMonitorKeyboardPower
Windows 7 Pro  BenQ XR3501 Logitech G710+ EVGA G2 750W 
CaseMouseAudioAudio
Cooler Master Stryker Logitech G602 Asus Strix Nakamichi 5.1 
CPUMotherboardGraphicsRAM
Phenom II X4 965BE  Sapphire 790X Zotac GTX650  4GB Corsair 1066 DDR2 (1GBx4) 
Hard DriveHard DriveCoolingCooling
G.Skill Phoenix Pro 120GB WD 2TB Green Stock 3x120mm UQ fans 
OSMonitorKeyboardPower
W7 Pro SP1 x64 LG 21' 1680x1050 Genius  Corsair CX600 
CaseMouseMouse PadAudio
Gigabyte  E-Blue Mazer XFX WarPad On-board 
Audio
Logitech G35 
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post #3 of 4
Thread Starter 
Yes the pins were all okay on the PSU and the MOBO. I can provide pictures later. Btw the grey wire "power_good" should the 5v be on all the time or should it peak at 5v at pc startup.
because it peaked at 4.5v and vent down to 0.1v when booting pc up
post #4 of 4
Thread Starter 
I have found the problem why is the "Power_Good" signal missing.
The red wire is 5.6v and should be 5v. I didnt know the tolareance was low as 5% on these.doh.gif

Now the question is what is causing this? Is there a known component that goes bad and causes the voltages to rise?
What should i check first?
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