PNY GF4 Ti4200 Voltmod?

[gooFly]

Hi,

I got a PNY GF4 Ti4200 and was wondering if anyone knows a way to volt mod it?

The back side got 3 small chips:
1st.
P22SG
74ACT08
data sheet (http://www.fairchildsemi.com/ds/74/74ACT08.pdf)

2nd
TL431C
21M
A754
data sheet (http://www.semiconductors.philips.com/acrobat/datasheets/TL431CX.pdf)

3rd
51031
74AI


and the front looks like this (http://koti.mbnet.fi/kegetys/keeforse.jpg)

All help is very welcome.


-
gooFly

[DaGooch]

You should be able to find it from there.

http://www.xtremesystems.org/forums/showthread.php?s=&threadid=1466

[gooFly]

checked it, but my card don't have those chips that is why I started a new thread.

-
gooFly

[DaGooch]

Maybe DDTung can figure it out. Do you have a picture of the back of the card?

[gooFly]

Nope, sorry don't own a digicam. That pic of the front is taken by someone else. But I think that chips 1 and 2 are the ones, from what little I understod from the data sheets.


-
gooFly

[Hardass]

Here,s a thread where there is alot of discussion on the vmod of a Ti4200 maybe you can get some help from one of the people in the discussion. Link (http://www.xtremesystems.org/forums/showthread.php?threadid=1045&highlight=Ti4200)

[gooFly]

Hardass: I have checked that thread, but no info about this board there, so that is why I started a new one.

[DDTUNG]

The 51031 chip is worth looking at.

DDTUNG:cool:

[Bulldog]

If I am not mistaken PNY 's cards are made by MSI and have same board layout.......might be worth looking into

[gooFly]

DDTUNG: Thanks. Could this (http://www.onsemi.com/pub/Collateral/CS51031-D.PDF) be the data sheet for it? Any idea who makes that chip?

Bulldog: Know anyone that have modded their MSI or someone who could confirm that they are the same card?

-
gooFly

[DDTUNG]

That's the OnSemi chip that controls Vcore and Vmem on the Radeon 8500. Question is, what does it do on your Ti4200?

DDTUNG:cool:

[gooFly]

DDTUNG: How can I find out what it does on this card? Any idea what the 2 other chips might do, especially the fairchild chip 74ACT08?

-
gooFly

[tomatoman]

I have this same card and been looking on how to vmod it with no luck. Ill try tp post some pics up if it will help

[tomatoman]

Ok got some pics

This is the back at prety high resolution

http://zrethy.homestead.com/files/PNY4200/Back.JPG

Hope this is of some help if any more are needed I can get them.

P.S. I forgot to take out the sticker but teher is nothing special under it any ways.

EDIT cant seem to get images to work :(

EDIT2 I got the PDF for the 51031 (http://www.onsemi.com/pub/Collateral/CS51031-D.PDF) from another post i think it was goofly him self taht posted.

I went probing around the card with the voltmetter and got a couple of 1.6 and 3.3 or so mesurments. Any one know how to go anbout mesuering the chips and figuring out what does what??:confused:

[tomatoman]

No one wana help ?? Im beging here PLEASE!! :D

[xmastermindx]

ive got questions about this TI4200 modding too, ive got the same PNY card. I know they're manufactured by MSI too, but the board layout is slightly different. im hoping i can find help here, i tried emailing others but i havent come up with an answer yet.

This is a copy and paste of an email that i mailed Zack of maximumoc.com, asking for his help too. He directed me here to you guys, namely to ddtung (ive been told you're very knowledgable by some of the guys over at madonion's forums). The card that im referencing in my email is the MSI one Zack modded on his site, link is www.maximumoc.com (http://www.maximumoc.com/guides/4200voltmod.html)



I was looking at your GF4 Ti4200 modding guide, and I had a question about it. I've got a PNY card, 64MB, and in your guide, there is a chip on the back of the card, on the upper right, that is one of the voltage ontrollers. I don't know if it controls the Vgpu or Vram, as you didn't specify in the article. The thing is, my card doesn't have that chip. Right above the chip on your card, I can see the letters U814, and on my card, U814 is indeed there, but its just a plain, white box, no chip there. Then on your card, there is the other chip on the upper left side of the back of the card. That one is marked U813 on your card. My card does have that U813 chip, but it's not the same kind of chip from your card. Mine only has 8 pins, 4 on each side, while your card's chip has 14 with 7 on each side. The only spot on my card that has a chip similar to the two on yours is at U816, on the lower right
of the card. I wanted to know if you could help me with my problem, I'd really like to Vmod this card, and unless it turns out that it's not possible with this card, I will be purchasing what I need from you. Please, if you can, help. I have linked some pictures of my card for you to see. Thanks for anything you can do for me Zack.


ive also linked my same pictures for you guys. sorry for the shoddy quality of the pictures, i dont have a really good digicam yet.

Picture 5 (http://home.attbi.com/~ivan.olmo/pics/Picture_5.jpg)
Picture 6 (http://home.attbi.com/~ivan.olmo/pics/Picture_6.jpg)
Picture 7 (http://home.attbi.com/~ivan.olmo/pics/Picture_7.jpg)
Picture 8 (http://home.attbi.com/~ivan.olmo/pics/Picture_8.jpg)
Picture 9 (http://home.attbi.com/~ivan.olmo/pics/Picture_9.jpg)

thanks guys, for any and all help.

[xmastermindx]

BUMP

come on guys, please help :(

[N8]

Hopefully DDTUNG will stop in again soon to answer your questions :)

[DDTUNG]

Guys, its a bit difficult when I don't have the card.

If the 51031 chip does anything, you should connect a VR between pin 5 and ground. Measure the onboard resistance with power off between pin 5 and ground, and set the VR to 20 times that value for testing. Do be careful cause we are shooting in the dark.

Would also help me if you take all the markings from the chips
that you suspect are voltage regulators and post them up for me.

DDTUNG:cool:

[xmastermindx]

Ive borrowed some of you guys' pics of this card, cuz your pics are high res and mine are kinda crappy looking. anyway, ive marked any and every chip that might control voltage, and ive also marked the voltages of the capacitors on these cards. the following pictures show what ive done. i havent done resistances yet though, ill add those in a few minutes.

FRONT (http://home.attbi.com/~ivan.olmo/pics/front.jpg)
BACK (http://home.attbi.com/~ivan.olmo/pics/Back.jpg)

the voltage accuracy is within about 0.1-0.2V, as i have an analog multimeter, and reading it isnt as easy/accurate as a digital one.

btw, when i measure resistance, i measure between pin 5 and ground, like DDTUNG said...but what do i use for ground? ehh im a bit new with this stuff, so I'm learning what I don't know as I go...so yea, what do i use for ground?

EDIT: i believe ive figured what i can use for ground...i just attached my black lead to the video cards mounting bracket, the thing that you screw into your case...ya know ;) and with the red lead, i just went probing and came up with the same measurements, so there ya go, i got it on my own :D

i still need help with the rest though :confused:

[tomatoman]

SO all I should do is conect the VR in pin 5 and the ground..... Now where do I mesure if the voltage is going up or not ? And a better Idea can I actualy turn teh voltage down so i can find out if that the right one ?

[xmastermindx]

Originally posted by DDTUNG
Guys, its a bit difficult when I don't have the card.

If the 51031 chip does anything, you should connect a VR between pin 5 and ground. Measure the onboard resistance with power off between pin 5 and ground, and set the VR to 20 times that value for testing. Do be careful cause we are shooting in the dark.

Would also help me if you take all the markings from the chips
that you suspect are voltage regulators and post them up for me.

DDTUNG:cool:

what rating pot should i use for this? these (http://www.radioshack.com/category.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F010%5F003%5F000%5F000&Page=1) are the pots that Radio Shack carries, are any of these the right one? i figured out where to find any ground points on the card as i was reading through some of your other posts. anyway, my multimeter only has one range for measuring ohms, and its x1000. between pin 5 of 51031 and ground, i get a measurement of ~0.59-0.6, which, on the x1000 scale, figures out to about 600 ohms...right? i hope im right on this, but i think i'm probably reading it wrong. ill be getting a digital multimeter in about another week though, so if this isnt figured out by then, i'll have a more precise answer for you.

btw, this (http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F008%5F002%5F001%5F000&product%5Fid=22%2D218) is my multimeter, maybe one of you can take a look at the ohmeter part (the red scale on top) and let me know if im reading it right or wrong. it says "K OHMS" and then there is the number scale, starting with 0 at right and moving left up to infinity.

[DDTUNG]

I would test it with a 20k VR set to maximum, then turn down slowly to see if the 2.8V goes up.

DDTUNG:cool:

[xmastermindx]

Originally posted by DDTUNG
I would test it with a 20k VR set to maximum, then turn down slowly to see if the 2.8V goes up.

DDTUNG:cool:

ok, in the morning i will be picking a few pots up. now, you said it was to see if the 2.8V goes up...what exactly do you think that 2.8V is for? because i also recorded measurements of ~1.5V, ~3.5V, ~5V, and ~12.2V.

[DDTUNG]

Just a hunch that the chip control Vmem which is 2.8V. Of course you should check all the other voltages as well in case I am wrong.

DDTUNG:cool:

[xmastermindx]

ok thanks a lot DDTUNG, i will post here tomorrow with my findings.

[tomatoman]

I did teh mod went to check voltages im geting funky reading turns out batery on meter is Gone :(. So undid the mod till I get another 9 volt.

[xmastermindx]

whew....its been a while since my last time here...ok guys, I've got what I need, and I'm ready for the mod right now. One question though...the VR has 3 pins, I've connected the wire from ground to pin 2 of the VR, and the wire from 51031 to pin 3...is that ok? and if so, would pin 1 have any use? i'm new to using these VR's, so I'd like this information. Thanks.

[N8]

Pin 1 & 3 have the same function on the VR. One might make ya turn the VR opposite from the other(can't remember) but other than that, they're the same :)

[xmastermindx]

thanks [N8]. one more question. when i connect my multimeter to different pins of the VR, i get different Ohm readings. it still goes up and down when i turn the screw, though. If i connected pin 1 of VR to the probable voltage regulator, and pin 2 of the VR to ground, where can i measure the ohms of my VR? thanks.

[N8]

Weird that its doing that to ya. If you're going to use Pins 1 & 2 then ur resistance would be measured between those 2 pins....but with the VR unhooked from the card...if that makes sense. :)

[sysfailur]

Ahh just checking up on this thread, glad to see you're getting close to figuring it out ;)

[xmastermindx]

quick noob-style question ;)

when im measuring voltage of my card, i use DC, right?

thanks

[xmastermindx]

and another question. when i measure resistance between pins 1 and 2 of the VR, i seem to be getting correct readings. i turn it all the way to one direction, i get max resistance, turn it all the way to the left, get it to zero resistance. but then, once i connect it to ground and pin 5 of 51031 on my card, i get the regular resistance between ground and pin 5 on my card.

something like this:

VR turned all the way to right (or left, cant remember):
MAX RESISTANCE

VR turned all teh way to left (or right, cant remember):
ZERO RESISTANCE

resistance between ground and Pin 5 of 51031 on my card:
~600 OHMS if i read correctly

resistance of VR once i solder it to my card:
~600 OHMS again

im not exactly positive on what i should be doing/measuring, when and where. i need a little clarification.

[sysfailur]

Originally posted by xmastermindx
and another question. when i measure resistance between pins 1 and 2 of the VR, i seem to be getting correct readings. i turn it all the way to one direction, i get max resistance, turn it all the way to the left, get it to zero resistance. but then, once i connect it to ground and pin 5 of 51031 on my card, i get the regular resistance between ground and pin 5 on my card.

something like this:

VR turned all the way to right (or left, cant remember):
MAX RESISTANCE

VR turned all teh way to left (or right, cant remember):
ZERO RESISTANCE

resistance between ground and Pin 5 of 51031 on my card:
~600 OHMS if i read correctly

resistance of VR once i solder it to my card:
~600 OHMS again

im not exactly positive on what i should be doing/measuring, when and where. i need a little clarification.

Once you solder it to the board, you can't get the reading of the ohmage.

[sysfailur]

Originally posted by xmastermindx
quick noob-style question ;)

when im measuring voltage of my card, i use DC, right?

thanks

Yep.

[xmastermindx]

well guys, im pretty sure i just didnt do something wrong (but maybe i did), but either way, my card has been murdered :(

on boot up its just a white screen. im gonna pick up a new one tomorrow probably, so if anybody wants to do a little clarification on the original procedure that DDTUNG came up with, post it so i can be a lil more sure of what im going to try out again ;) thanks guys

[Aonia]

Any luck with the mod?

My $90.00 4200 is maxing out at 310/580 which is killing me. Im setting up my home brewed ti block this weekend, and it would really be sad to be stuck at stock voltage with such a good cooling setup.

[Wolf]

Anyone figure out the vmod for this card yet. Just picked one up for $90 and I want more out of it. Please post if you found out how to get this card vmodded. I've been looking everywhere and can't find jack on this card for vmodding.

[BrainStorm]

ANd there still doesn't seem to be jack. Did anyone ever figure out how close this card is to the MSI, and whether looking at the MSI v mod stuff would help?

[PoTHeAD]

i hope somone figures this out:D