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PSU cables shorting out against video card

post #1 of 4
Thread Starter 
I've been having issues with random shutdowns ever since I built my mITX system. It's been really hard to diagnose because it's so random. Sometimes it'll happen just browsing the web, sometimes during the middle of a game with the GPU and CPU at full load. Never a consistent time between boot and a random shutdown. After doing some testing, I was starting to believe it was just a bad PSU and was getting ready to RMA it, but I decided to wiggle some of the PSU cables while the computer was on to see if there was a loose connection anywhere. As soon as I moved the CPU power cable, the computer shut down. Started it back up and tried again, but this time I watched more closely as to what the cable was hitting as I moved it. As soon as it bumped against the graphics card, the machine instantly powered off. I tried again with the 24-pin mobo cable and found the same issue. The cables aren't damaged and have the plastic coating on them, but apparently that isn't enough when they are right up against some of the metal circuitry on the back of the graphics card.

Since this is a mITX system, the space is very tight. There were only a few mm of space between the CPU cable and the back of the graphics card. I assume that as the computer heated and cooled, it was moving just slightly and bumping against the graphics card, causing a shutdown. The 24-pin cable has slightly more space, and since it's thicker, it probably stays in place better and shouldn't be an issue. I was able to tie the CPU cable to part of the case to help pull it away from the video card, but I still dislike having such a small amount of space between it and the card. Has anyone else had an issue like this with SFF builds? Is there any sort of insulator I could put between the card and the PSU cables to keep them from touching? Or would getting a backplate like this one for my video card be the best way to go?

Edit: Added some pictures of the cables, black and yellow is CPU, multicolored is 24-pin.



Edited by TarballX - 5/11/13 at 7:32pm
post #2 of 4
Paper, cardboard, plastic, wood.....

dunx

P.S. Or add some spiral wrap...
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by 2002dunx View Post

Paper, cardboard, plastic, wood.....

dunx

P.S. Or add some spiral wrap...

My concern with those would be them catching on fire, since it's right up against the back of the graphics card, which can get very hot.
Spiral wrap looks like it may work, though..
post #4 of 4
if your pcb is reaching upwords of 90c i would worry too... but there is no way. electrical tape may work but to be honest i highly highly doubt anything is shorting out. if it were your video card would not survive long. sounds more like a loose connection to me. possibly an instability.

a short would require bare wires.
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