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I need help with my first capmod and somethinng else...

post #1 of 5
Thread Starter 
Hello..I wanted to learn how to volt and i finally got to by buing a 7600gt sadly a passive card so i think to mount to mount my gtx 470 block to it.
But my problem is that its my first volt mod and i want to ask 2 things.
So first of all i found my fb and gnd pins measured the resistance and ordered 10 variable resistors but i want to know how to find a 0 resistance resistor so i can directly solder to that not to the tiny pins of the pwm.I read that you have to find 0 resistance between both gnd and fb pins but i seem not to find any...And if i find some with 0 when i touch it my multimeter spikes then gets down to zero which is strange.So the next thing is the cap mod.I think of replacing the original 420 and 820 uf cap with 1000 low esr that i ordered but i want to know where can i find other points to solder caps on?I just poke around points and see where the voltage is bad?And what ground do i use? on the card or on the pc case.And last but not least how can i find vgpu, vmem and ground spots on the card...And is there a point in changing the coils of the card?This particular one hasn't even got a pcie power plug.Alot of questions im sorry but i guess im not smart enough to understand the tutorials and this is a really good skill that i want to learn as an enthusiast wink.gif.
post #2 of 5
Post some pics of the front and back of your card that will help.


When looking for ground for your feedback mods you can use any ground point on the card. Just go with whatever is easiest.


You don't need 0 ohm resistors for anything if your mm goes down to zero slowly that's because the mm puts a little charge in some of the caps and as it discharges it slowly goes down to zero.


When doing cap mods just piggyback the caps on to ones that are already there. Try and find nice can caps that has solder points on the back of the card to start once you are comfortable with the soldering add some cans to the ceramic caps right where the core is on the back of the card. I would not bother replacing caps since you can just add to the ones that are there.


If I were you I would start with feedback mod and then max out the card paying close attention to vdroop under load. That's where caps will help the most.
    
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CPUMotherboardGraphicsRAM
1100T ga-990fx-ud3 gtx 4602win corsair dominator 
Hard DriveOptical DriveOSMonitor
OLD none windows 7 x64 Ultimate 3d projector with 98in screen MOFO 
KeyboardPowerCaseMouse
DUMB ocz 1000w pretty ugly logitech wireless 
Mouse PadOtherOther
carpet gtx285 classified for physix Nvidia 3d vison  
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post #3 of 5
Thread Starter 
Hi thanks alot for your reply...So what happenes is kinda funny... i tried to dissasemble the card only to find 2 stripped screws which i tried everything on but they didnt unscrew so i dremelled them off only to reveal that after 30 minutes of dremelling( for some reason they were WELDED to the plank) that the screwas were held on by an adhesive pad... biggrin.gif im screwed huh?So after that i tried to boot the card with no cooling and my pc shut off after less than 5 secs.I was amazed it worked after all those vibrations.So i decided to touch the gpu with my finger and all you need to know is i "SLIGHTLY" burned my finger. biggrin.gif But then i realised that "Aint anybody got time for that" So i freehanded a gtx 470 cooler(held it on by hand) on the card while it booted and thank god it works pfff magic.All this took 3 hours and the card has slightly bent caps is covered in thermal paste but IT WORKS tongue.gif.well thats the boring part

The important part..
PICTURES http://imageshack.us/g/195/imgp0167w.jpg/
I am trying to find ground spots on the card i know the gnd pin and fb pin on my controller...
I know that the pci-e bracket and the copper on the screw spots are gnd but i dont really want to solder to those but i lack the knowledge to find the others.

I mean i want to find a resistor that is connected to the fb and gnd pin of the pwm beacuse it would be wasier to solder on.
Ok i will add more caps.I am just waiting for my stuff to arrive.
Here are the pics.I guess the ceramic resistors are the bigger ones on the back of the gpu but theyre alot and i have no idea how to measure if they'r voltage is good.Now i have to ghetto some cooling for the card.
Edited by stefanovasj - 2/11/13 at 11:47am
post #4 of 5
Thread Starter 
Hello again smile.gif.
Today my caps and pots arrived so i got to soldering.I got the thinnest wires i could get(not thin enough) fand cut some of the copper and started soldering...And well after 5 hours of soldering i couldnt make them stick...The probelm i guess is that my iron doesent get hot enough on the tip but 1mm above it were it's too wide.So after alot breathing in alot of plastic melting 1 of my nails and burning my fingers twice with the iron i was near rage quit but my iron was faster then me!It stopped working...I ordered a new iron and im waiting for it to arrive tongue.gif.Until then i need to give the card a real good cleaning beacuse it has alot of solder on it.And i will regain my mental stability because i lost ALOT of it when doing this mod.and i still have to make the card some cooling.I tried hooking up a thermalright 120 extreme i believe it is but it didn't work.So im back to the fermi cooler
Any posts and tips are welcomed as you can see i do need help.. biggrin.gif
post #5 of 5
Never boot a card without a cooler!

A lot of modders use the old IDE ribbon cables to connect VRs.

As for finding an alternate place to mod FB, you are looking for a 0Ohm connection between FB and another spot. As for ground, any ground. You can find ground on one of the legs of every cap, so they are all over the board. I use the VGA bracket as my master ground while I probe the board to find other ground spot. Note: caps always have a marker on them to show which leg is meant to be ground.

For this controller, the legs are huge, looks like there is a spot next to it that is connected. Test for continuity with your DMM to make sure. Personally, I would just mod to the IC, as that leg it bigger than the spot on the resistor next to it.
LEAD Technologies Inc. V1.01

As for the caps, just pigging back the back of the existing caps legs on the other side of the board. Just make sure to get the ground legs right. Notice the choke's legs are next to it. DO NOT put a cap on that thing, not unless you want to see a cap explode, which is kinda cool. Everyone should do it once. tongue.gif

LEAD Technologies Inc. V1.01


Good thing to start off with an old cheap card. You will likely break it, but that's ok. It will be a fun learning experience.
    
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