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fans shorted GPU may be dead - Page 3

post #21 of 26
Thread Starter 
first looking at it it looked like it went into the 12v line on the fan because the casing from the 5v line had melted to it but it actually shorted on the -12v line so what-could that have done to the gpu

image after cleaning up wires to see were it shorted


that the fan that shorted out the other fan had just started to melt the casing on the 5v line
post #22 of 26
That looks like what happened, I'm not sure what affect shorting the 5v to the 12v ground would have - just that it prolly wouldn't be good for the GPU or PSU . I'd still be worried that the PSU didn't detect it and shut down though, I know from experience mine does if I short something.
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post #23 of 26
Thread Starter 
Quote:
Originally Posted by Darren9 View Post
That looks like what happened, I'm not sure what affect shorting the 5v to the 12v ground would have - just that it prolly wouldn't be good for the GPU or PSU . I'd still be worried that the PSU didn't detect it and shut down though, I know from experience mine does if I short something.
the system was shutting down when it happened when i saw the smoke i hit the switch on the back of the psu i think i reacted quicker than the psu could since i was sat next to my rig with the side off ready to install the cold cathodes any way time for me to go to bed going to check back tomorrow
post #24 of 26
Thread Starter 
ok the ebay seller responded and is asking the product manager about the problem

i dont care that the fans shorted im more annoyed that i no-longer have a usable graphics card i guess i now have a very expensive rare paper weight

RIP AIT Radeon HD3870x2 1GB (sapphire) KIA on 09-06-2011
post #25 of 26
you put +17v into a 12v input on the GPU and the rest of your system... its a wonder any of it works at all.. You most likely fried your PSU instantly ..and then just damaged the remainder of the hardware by trying to reboot again and again... force-feeding it +17v into its +12v inputs..

*happened to me when I fried a PSU benching.. PSU shorted +12 and -12 together ..fed the mobo +24v, along with the CPU and GPU... = done.
post #26 of 26
Thread Starter 
Quote:
Originally Posted by CL3P20 View Post
you put +17v into a 12v input on the GPU and the rest of your system... its a wonder any of it works at all.. You most likely fried your PSU instantly ..and then just damaged the remainder of the hardware by trying to reboot again and again... force-feeding it +17v into its +12v inputs..

*happened to me when I fried a PSU benching.. PSU shorted +12 and -12 together ..fed the mobo +24v, along with the CPU and GPU... = done.
i didn't keep trying to reboot the system was shutting down when it happened i hit the power switch the second i saw what was happening i was sat next to the system with the side off when it happened

i took the gpu straight out of the case cus i thought it was that to inspect it and found the cables on the 2 extra fans charred it it must have been shorted for no more than 5 seconds just dont know what caused the 5v cable to melt in the first place

looking at the cables the only other thing that group was a sata dvd drive and that is at the beginning of the run the fans were almost at the end with nothing using the 5v line

just looking for a new gpu now and sell the hd 3870x2 as some one may be able to get it working
Edited by craigs911 - 6/9/11 at 8:43am
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