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Psu melted plastic

post #1 of 11
Thread Starter 
Well my pc just powerd off like 20 mins ago and i pulled the psu wire from the board and the 2nd yellow wire from bottom should be a +12 plastic wasl melted. I orignaly tested my stuff with a smaller psu and it worked. Then i put my seasonic connector in a extender and pluged it in the motherboard and its powering my pc. But i hardly feel safe letting this run like this for very long i thought a seasonic 850 had plenty of power for a overclocked i7 and 5970+5870.

Should the +12 wires yellow ones be hot to the touch ?
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post #2 of 11
Sounds like you managed to draw too much through the board. The wires aren't rated for that much current draw? Its like when you plug too much stuff into a wall socket, a fuse will blow. But theres no fuse, so its started heating up the wires. I'm not sure what to do now tbh, Take out the 5870 for now. (Edit, that could be a pain because its on water....)
    
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post #3 of 11
Are you talking about the EPS12V connector? 8-pin motherboard connector?
post #4 of 11
Thread Starter 
well board can only supply 75watts per card rest should be thru the pcie connectors. And those dont get hot at all but the yellow wires on the atx connector are heating up pretty good.
Quote:
Originally Posted by Phaedrus2129;13045632 
Are you talking about the EPS12V connector? 8-pin motherboard connector?


no the atx connector the 2nd to bottom yellow wire plastic literaly melted almost all away then it powerd off and wouldnt come on befor. If i load up my gpu cards it feels like that thing is gonna melt to nothing it gets so hot fast.

#10 is one the plastic melted on and those are pretty dang hot.
g1XHX.jpg
Edited by Bal3Wolf - 4/7/11 at 11:29pm
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post #5 of 11
I see. That's probably the pin providing power to the PCIe slots, and the cards are probably exceeding the PCIe's specified draw. That combined with other load from aux chipsets, and it's exceeding the safe current carrying capacity of 18AWG wire, and the pin used as well too. Good thing you shut it off when you did or you might have had a fire on your hands.

Not a fault of the PSU's electronics, more the engineers not anticipating the need to use 16AWG for that pin. Though the motherboard engineers should also be chastised for letting the board draw that much from one pin.
post #6 of 11
Thread Starter 
it shut off on its own so i guess im lucky it didnt dammage anything i guess im in for a new psu would this psu be safe to use or use on a pc that uses alot less power ?

Crazy thing at the time it powerd off i was only running 4.0ghz on 1.24 vcore 1.30 qpi with both my 5970@ 920 1.178 and my 5870@1000 1.20 i waset really doing insane clocks but today i have been pushing alot of volts testing stuff on the cpu.
Edited by Bal3Wolf - 4/7/11 at 11:35pm
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post #7 of 11
In terms of absolute power draw you're fine. If it was a motherboard with an auxiliary power connection (usually a molex or PCIe that plugs into the motherboard) then you'd be just fine. As is, a 5870x2 setup should work.
post #8 of 11
Thread Starter 
so its safe to keep using this psu even after it melted the plastic ? i noticed now when i put my gpus under load i get a wierd sound but not when cpu is under load.
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post #9 of 11
Chances are the PSU is faulty with a bad component that connects to that wire or the system has a short somewhere and is pulling more than needed. Need to start with replacing PSU and testing. Remove components as needed to find the cause.
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post #10 of 11
Thread Starter 
I just remmberd while i was doing some work on my backup pc and moving hardrive out not a day befor i had that plastic melt i had added a 120mm fan and a 60mm fan blowing on my video card. The 60mm draws 0.68amps and the 120mm no clue i rewired it to connect to the motherboard header each fan was on a header up close to the atx. I can even recall remmber hearing the small fan speed change not really thinking anything i guess maybe those 2 coulda caused the overload on that +12 line somehow.
Edited by Bal3Wolf - 4/9/11 at 9:46pm
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