Palit 8400GS vmods Help - High res Pics Included

hammad · 18. Juni 2009

HI
This is my first post in this forum ,
can You giyz Plz help to to vmod , vmem and vgpu to my Plait 8400 GS
it is a Good overclok able card here are the screenshots
i am Doing first time the Voltage mods so plz a little bit explain will be much appreciated ( i am familiar with soldering )

http://img265.imageshack.us/i/asdfasdf.gif/
All Images in Zip
http://www.mediafire.com/?sharekey=eb38f657bacff0085a3d773badf21430ff95f9ee05766e18c95965eaa7bc68bc

You can Answer in Your language I will Use Google Translate

computertod · 18. Juni 2009

Hi, please upload the Pictures in the Forum :daumen:

for VMods, you ask at best mAlkAv
my English is not very good
computertod

hammad · 18. Juni 2009

Updated

mAlkAv · 18. Juni 2009

Hi, I already answered on your thread at OCX, but here is the answer anyway:

"Key of many graphic card Vmods is an IC(internal circuit) which regulates the Vmem and/or Vgpu. For modding it you need to find the right one as well as the datasheet. This gives you detailed information about the IC and tells you which of the pin is the Feedback(FB) Pin. This one needs to be connected to any ground with a variable resistor(VR) bewtween both points. This makes overvolting possible by lowering the resistance.

I hope this is comprehensible for the beginning.

Please can you figure out the writings on the IC's I marked on the following pics?"

OCXtreme.org Forums

OCXtreme.org Forums

hammad · 18. Juni 2009

ok i will update in this thread with IC numbers with in next few minutes

hammad · 18. Juni 2009

I AM WRITING THE NUMBERS AT IS

1
Pm25LV512
AE0749
M04178C

2
AT88SC
0808C
U 0742

3
apw7065
mjb4c b

One more thing i want to add is , the direction of ic 1 and ic 2 id opposite

Mean The , if i need to read the text from IC No. 2 , than according to picture i need to turn the vga

, than i can read it

mAlkAv · 18. Juni 2009

Hi, APW7065 seems to drive the Vgpu. The other 2 IC's are not of interest for vmodding.

If you have a digital multimeter please measure the resistance between pin 3 and 6. (you have to count from the lower left leg contraclockwise)

Perhaps you can mark the APW on your pic than I could draw it down. For now I don't know which of the 3 8-legged IC's has got which partnumber

hammad · 18. Juni 2009

Hi

i dont have the digital meter but , but i have an analog meter . at the moment .

should i check the Recistence or voltage ? (the meter have abilty to check the ohams and dc volatges )

hammad · 19. Juni 2009

more clear pictures

mAlkAv · 19. Juni 2009

I need to know the resistance between Pin3(or any other ground) and Pin6(=feedback pin).

hammad · 19. Juni 2009

well i don't exactly know how to see the recistence with an analouge meter , but

according to my measurements i think it is 20

is it should be the round this amount ?

hammad · 19. Juni 2009

btw

i am checking these legs

mAlkAv · 19. Juni 2009

Well I dont know which way the partnumber is around, but you can prove this if the resistance between pin6 and any other ground is the same and if the resistance between pin3 and any other ground is 0.

The value depends on the measurement range. Perhaps you can tell me if its 200, 2000, 20k, 200k or 20M Ohm?

greetings

hammad · 19. Juni 2009

i am stuck at the dam analogue meter

trying to find out how this works , will update in next few minutes

hammad · 19. Juni 2009

ok ,

finaly the resistance is 50K

tell me whats next

mAlkAv · 19. Juni 2009

I just realized that you probably measured the resistance at the wrong pin.
If the partnumber is the way around you marked on your pic it should be like this:
http://extreme.pcgameshardware.de/a...vmods-help-high-res-pics-included-apw7065.jpg

Next step is to get a fitting VR or trying a pencil mod. But first you need some voltage measure points.
I will do this tomorrow.

hammad · 19. Juni 2009

ok , Thanks for your support , i will also try to arrange a digital multi meter tomorrow for exact resistance ,

yes i used the same legs as you mentioned in the image , (i also tested the way you just told me few posts behind , about checking the ground and than cheking the fb to any gorund and it works )

by the way , what approx value you think i should get on those points ?

mAlkAv · 19. Juni 2009

The value will be probably between 300 and 800 Ohms.
Just for info, you always need to build the card off your case/mainboard, else you get much higher values.

hammad · 19. Juni 2009

ok , Today i went to the local market and bought a digital Meter ,

and setting the range to 2000 i am getting the value 680

and when i set the range to 20k then i am getting 0.68

so finaly what i understood is it is 680 ohams

so plz tell me whats next

Thanks

yes my Vga out of case/mainbord .

mAlkAv · 19. Juni 2009

680ohms sounds good to me. You need to get a variable resistor now and some wires if you want to solder.
The VR needs to be a 20k one, and should look like this f.e.: http://media.conrad.de/m/4000_4999/4200/4240/4246/424609_BB_00_FB.EPS.jpg

Palit 8400GS vmods Help - High res Pics Included

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