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Popin caps gtx 275 - Page 7

post #61 of 98
Thread Starter 
Ok this ocp is driving me crazy. I can't hardly go over 1.33 load with the screen going grey/yellow/black. Once it changes it reverts to a non load 3d voltage. Is this the ocp? I accidentally unsoldered the resistor for the ocp thinking I had a bad connection. I just soldered my pot/resistor Directly to the spot of the resistor and still the same ****. I can get to 750/1774 at 1.33-1.35 load and it will last for a few seconds to a min. Anything more only last for seconds. Seems fine at stock clocks. B4 in my last post it apparently was not OCD after my restart.

When the screen goes solid I can hear the game continue to run.

Any ideas? I have tried everywhere from56k to 160k on the ocp
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post #62 of 98
I would suggest like 10k final resistance for the OCP mod..you did say ~26k was stock correct?
post #63 of 98
Thread Starter 
Once I measured it properly it came out to 196k. Pizza man said his final resistance was 100k I think. I have tried a wide range 56k-160k.

I'm now curious about that solder point/trace I ripped off. Do you have a ref 275 currently so you could check something to put my mind at ez?
Edited by SlowPWNY - 2/7/11 at 7:20pm
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post #64 of 98
its not the only mod required.. and most likely not even the true OCP/r ..but more liek an offset or comp pin instead. I bet that pad tones to pin14 or 17

see cowies comment on this mod at the bottom of the page here

I have attached a pic for you to reference..please see if you can measure for me the pads and resistors in the area marked red. This will be IMON/IREF where we can disable OCP.

Attachment 194545

Attachment 194546


Edited by CL3P20 - 2/7/11 at 9:46pm
post #65 of 98
Yea, he modded RT pin.

One thing I did notice was the VRMs ran much hotter after the OCP mod.
    
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post #66 of 98
ILIMFS may be the mod shown by cowie..its closer to that area, and would have a direct affect on GPUv as well as its tied to COMP directly.

I think it would be best to pencil down the resistor connected to either IREF or IMON to fool the circuit into seeing less current, rather than use the ILIMFS that seems to boost GPUv.. I dont have this GPU though, can someone confirm this? would be much better to work a GPUv separate from OCP..
post #67 of 98
The vGPU mod point in the pic by cowie is missing on his board. I wasn't sure what it was either and didn't use it when I modded my 260 with this PCB.

I'll pull it out and see if I can trace these paths on my card. To bad it's dead or I'd try it.
    
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post #68 of 98
Thread Starter 
Uea that mod point is gone. I was wondering if it had any importance. It almost looks like it may have been on a trace that tied those resistors together?????

The resistors in that circle the bottom left one is the one pizzaman listed to mod, I believe it was 196k. I accidently unsoldered it and just decided to put my pot in it's place since I was lowering the resistance anyway.

I will meshed the rest of them when I get a chance. I should be able to do it tonight but I have to finish taking apart the motor in mah hotrod tonight :/.

What is the proper way to mesure the resistance of a resistor when it's on a board?

One more thing. Someone said inthis thread that when ocp kicks in my voltage will read close to 0, mine reads at a idle voltage of 3d clocks. So if it's set at 1.33 and loads at 1.36 when the screen goes solid it will go back to 1.33
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post #69 of 98
If it's not dropping to o.oov, then it's prbly just unstable.
    
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post #70 of 98
Thread Starter 
well im not running it any further than b4 i put all these caps on it. what could be causing it to become unstable???? heat shouldint be a issue. its not making it out of the low 40's.

i wish somone could just mesure the resistance by the first mod point ti know if a trace connected the ends of those 4 resistors. the 2 on either side ohm out to nearly 0, but accros the the the missing point the resistance goes up.
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