GPU short circuit. EXPERTS PLEASE HELP!!

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mironso
Ok, sorry for misunderstanding.
On first picture, you can see power pins and row of capacitors 820u - 2v5. All this part is power circuitry for your card. You need to find markings on these chips, google it to see what they are. On data sheet you'll find pin out. Basically it's in, out and gnd. With multimeter you will test it for short circuit.
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mironso

mironso

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Apr 13, 2013
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This is power connectors, I assume. You need to see to what cord is connected. If it's connected to black, then is normal to be short circuit to the ground, b'cause black color is for gnd. You need to test your graphic in another rig to see if works there. Is there a warranty any kind for your card? If you disassemble you card then warranty is gone.
 
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karan28

karan28

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Jul 22, 2013
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It is out of warranty. I went to the service centre but they dont do repairs.
So I have to try it myself.
And about your assumption, There is no problem with power connectors from the PSU. But there is with the connectors in the card. All of them are shorted to the ground.
And there's no use of testing the card in other pc because as soon as i plug the power connector to the card (TESTEd with 2 PSU's), the system doesnt run. Fans just move for a sec and then stop to prevent the short.
So its the card for sure.
 
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mironso

mironso

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In last thread, you circled just two pins. Now you saying that all pins are shorted to gnd. Put pisture from another side of card. Try checking your capacitors, resistors. Find voltage regulators, may be they are dead.
 
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karan28

karan28

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No . I said except the circled pins, all others are shorted.
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I know what components are resistors, capacitors, but not regulators. And how do i test them ?
I have multimeter and soldering iron. I know how to solder bigger components.
In the 4th pic. I tried to clean the area where i have circled in red. I was kind of rusty. But I dont know what exactly was the material on top of that. But i dont think it caused the problem because it was already on it when i had bought the card from someone.
 
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mironso

mironso

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Ok, sorry for misunderstanding.
On first picture, you can see power pins and row of capacitors 820u - 2v5. All this part is power circuitry for your card. You need to find markings on these chips, google it to see what they are. On data sheet you'll find pin out. Basically it's in, out and gnd. With multimeter you will test it for short circuit.
 
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Solution
karan28

karan28

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So I kind of fixed it.
There was a bad MOSFET which caused the short. Mironso helped me in testing it. I removed it and the short was gone.
I had that replaced but unfortunately while disassembling, I damaged a capacitor. Which I wasn't able to get because I dont have something to test for the capacitance.
So, I guess because of that capacitor, The fan control circuit is not working. Due to which The Fan does not move but GPU works.
I removed the 2 out of 4 wires from the fan connector. The yellow(12V) and black (GND) wires are connected and fan is running at full speed now.
I have tested it for 2 hours while playing different games. It works well.
I replaced the thermal paste, the temperature stays at 65 deg C under load.
Thanks again mironso for your time and helpful knowledge.
:)
I hope this helps someone.
 
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Joggymac

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Apr 28, 2014
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Hi, how did you go about finding and replacing the MOSFET, I too have the problem you encountered with the 6 pin power connector, but I am very unclear how I would find the MOSFET on my GTX 660.





 
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Luumi

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Aug 6, 2014
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Can some of you tell how did you find that bad mosfet? I have the same issue with my 780 ti matrix. While watching a video on youtube the system shutdown and now it wont power on with that card installed, works with other cards.
 
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Luumi

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My 780 ti matrix will prevent system to power on if the right 8 pin power connector is plugged. Any experts here that could advice how to possbily troubleshoot and find a short component? I can't see physical damage on card, I've cleaned it pc works well with other cards like 7970 and other 780 ti. This happened for no reason while I was watching a video on youtube and system just shutdown and it will no more run.

The pcb is very complex, that is why it's very hard to troubleshoot components.
 
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Luumi

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Hey could someone explain something to me a bit. In this picture: http://i.imgur.com/gHaKrBu.jpg
The circled brown components ( I don't know if they are caps) beep accross them and give like 1-2 ohm value, same what I get from the right connector's 12v pins to ground and gpu hotwire hole. Need to remember that the right connector is preventing the system from turning on.

The ones on the left so under the left connector that look identical do not beep and give like 500 and 600 ohm values. Could this be something?
 
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Guts28

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Oct 31, 2015
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did you manage to fix it? i'm currently having the same problem.. I was using my pc when randomly it shut down, after testing the video card OUTSIDE the case with another power supply, the PSU shut down automatically after I put the 6 pin connecter in (from the 2 connecters only 1 does this) I have an old GTX 560ti hawk.
 
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jhonbaflo

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Nov 28, 2014
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hello, did you solve ypur problem? i having a very similar problem eith a r9 290
 
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