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[RESOLVED] Dead GPU? [revived]

post #1 of 6
Thread Starter 
Finished volt mod last night. May have destroyed card.

Attached 1k VR to card and set to ~900 ohms (stock resistance was measured to be 13ohms).

Turn on PC, seems fine, "Starting Windows".... .... .... .... brrarrraarghghgararhghghghghgrghghhhh... flip power switch on PSU...

Removed modded card, replaced GT220 in same pcie slot, everything starts as normal, so definitely the card (duh).


First time I tried to solder a wire to a pad connected to the FB I accidentally ripped off the pad, popped the GPU in without doing anything else and everything checked out fine.

Change game plan, solder to a small capacitor next to removed pad that also looked to be connected to FB. Got same resistance from cap-to-ground as with FB-to-ground when setting DMM to 2k OHM and also continuity test.

Ground is marked below. Also remember not getting any voltage readings off of that and a couple other legs pre-mod when GPU in PC. Also, part of the wire soldered to cap is uncovered in the picture below but only b/c i slid it back some to get a better look underneath afterwards, it was otherwise covered up to the bead of solder.
IMG_0017.jpg

After hours of struggle, managed to get a strong joint soldering wire to the cap, measured from other end of wire to ground just to be sure (same stock resistance...assumed I didn't accidentally solder together any components that would be a no-no). Also visually inspected with magnifier to look for any possible unwanted connections.

Soldered wire to outer leg of VR. Soldered middle leg of VR to what I believed to be a ground, I had cut the connection by the time I took picture in order to test with DMM in-line.

Visual aid: http://s1276.photobucket.com/albums/y478/regularguy_oc/?albumview=slideshow

EDIT: didn't get a chance to measure vGPU post mod so not sure if I majorly f'd up somehow. Also,

stock vGPU: 1.19v (measured off of http://cdn.overclock.net/d/d4/500x1000px-LL-d4248173_vgpu_measure400.png)
stock resistance: 13ohm

VR: 900+ ohms (out of 1k max)

When pc is turned on...
Little LED on back of card (where DVI ports are) lights up green.
Fans turn on (sounds like 100%) after a second.

MILLION DOLLAR QUESTION:
Does anyone have suggestions on how to FIX/DIAGNOSE what's wrong? Is the card completely fried?


Also, maybe not important but there's a lot of low viscosity super glue, flux, and bits of q-tip cotton from trying to clean the flux off with alcohol on the board.
Edited by regularguy - 10/10/12 at 11:54am
post #2 of 6
If card won't work, I try to reverse the volt overclock by disconnecting the wires and removing any soldering
 
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post #3 of 6
Thread Starter 
I'm pretty sure (bad memory) I already tried simply disconnecting VR from ground and it didn't help. I'll give a shot to completely removing it though.

What do I do if it still doesn't work? I'm sure there's also something else I'd need to do since the very first time the pc booted up fine and I got all the way to the "Starting Windows" screen but subsequent boots didn't have any video.

EDIT: I remember something similar happening when I tried oc'ing mobo through BIOS for the first time, wouldn't POST, so I googled and found about resetting GPU BIOS by removing CMOS. Would that fix my problem? (After I remove the vmod of course).

Also, was there any steps I should have taken prior to applying a physical voltmod (like editing GPU BIOS or something)?
Edited by regularguy - 10/9/12 at 7:02pm
post #4 of 6
Quote:
Originally Posted by regularguy View Post

I'm pretty sure (bad memory) I already tried simply disconnecting VR from ground and it didn't help. I'll give a shot to completely removing it though.
What do I do if it still doesn't work? I'm sure there's also something else I'd need to do since the very first time the pc booted up fine and I got all the way to the "Starting Windows" screen but subsequent boots didn't have any video.

If the soldering isnt the best its possible you bridged a connection you shoulding have, so just removing ground wont help there
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post #5 of 6
Resetting Bios won't help if the card is damaged. A bad oc in bios(cpu/ram) is undone by resetting the cmos and that is what you did to recover the stock bios settings. You don't oc the video card in bios. Best bet, if nothing is fried on the video card, is to completely reverse the hard overclock.
 
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post #6 of 6
Thread Starter 
Successfully unsoldered the VR from cap. Tried to test FB to ground to make sure it's back at 13 ohms but my DMM seems to be on the fritz (only 3 days and it goes bad). Will update as soon as I can exchange it and test. Not going to risk powering on again until I've done so.

UPDATE:


Tested resistance and came out to 13 ohms as it should, popped in and GPU ran fine! Measured vGPU off of C666, 1.2v so desoldering was completely successful.

Now I just need to redo it correctly...
Edited by regularguy - 10/10/12 at 11:53am
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Overclock.net › Forums › Volt Mods › General Volt Mods › Graphics Cards Volt Mods › [RESOLVED] Dead GPU? [revived]