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post #101 of 1498
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Yikes! an analog MM. Oh noes.
    
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post #102 of 1498
Quote:
Originally Posted by PizzaMan View Post
Yikes! an analog MM. Oh noes.
oh T_T i just grabbed one from my dad's desk lemme see if i have a digital one

edit nope i dont =[
pics of the front



Edited by LIU_ZOMG - 1/5/10 at 5:22pm
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post #103 of 1498
Quote:
Originally Posted by LIU_ZOMG View Post
oh T_T i just grabbed one from my dad's desk lemme see if i have a digital one
Yes a digital would be best. And to answer your previous question positive goes on the FB and the negative goes to ground but it doesnt really matter when measuring resistance but for other things you need to have the polarity right especially when power is applied to the card.

I found a link to the data sheet but I couldnt get it to show up, maybe I need an older version of adobe to see it cuz it shows up for a second and then it dissapears . But from what Ive seen in other forums on the GPU mod I can possibly say that #13 is FB for the uP6201. Ill post the link to the data sheet in a minute but Im going to try and find one that I can open to be 100% positive on the FB
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post #104 of 1498
Quote:
Originally Posted by PizzaMan View Post
uP7701 data sheet updated to OP. Thx vDrop.


...looks like I need to alphabetize the IC list....do it laterz
Sorry for double posting but you are welcome PizzaMan

Ah I never could find the data sheet for the uP6201 but I knew I had done this IC before and here it is for the 2600Pro I had done a few months back hope the pic is okay. You need to measure the resistance between these two points #13 FB->#4 Ground.

Never mind I found the data sheet for the uP6201, Yay!

Edited by Voltage_Drop - 1/5/10 at 5:45pm
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post #105 of 1498
yup i did that- it reads exactly 1 on the ohm bar on x1k setting
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post #106 of 1498
Quote:
Originally Posted by LIU_ZOMG View Post
yup i did that- it reads exactly 1 on the ohm bar on x1k setting
Which IC is that for? Im lost my head hurts from doing all this research
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post #107 of 1498
Quote:
Originally Posted by Voltage_Drop View Post
Which IC is that for? Im lost my head hurts from doing all this research
=P uP6201 the one in the far left of the first picture i posted
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post #108 of 1498
Quote:
Originally Posted by LIU_ZOMG View Post
=P uP6201 the one in the far left of the first picture i posted
Okay if it is 1k exactly then you would use a 20k VR from FB->Ground which should put you at your stock voltage give or take a few mV. You would decrease the resistance to raise the voltage on the IC to maximize its gain.

Was this taken with the analog meter or were you able to find a DMM? An AMM will measure the resistance but are not as precise as a DMM. From the look of the other measurement on the other IC it looked like around 800ohms so a 20k VR would work for that as well, but I would definitely invest in a cheap DMM from Radio Shack or wherever if you do not have one before you start soldering on VR's.
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post #109 of 1498
Quote:
Originally Posted by Voltage_Drop View Post
Okay if it is 1k exactly then you would use a 20k VR from FB->Ground which should put you at your stock voltage give or take a few mV. You would decrease the resistance to raise the voltage on the IC to maximize its gain.

Was this taken with the analog meter or were you able to find a DMM? An AMM will measure the resistance but are not as precise as a DMM. From the look of the other measurement on the other IC it looked like around 800ohms so a 20k VR would work for that as well, but I would definitely invest in a cheap DMM from Radio Shack or wherever if you do not have one before you start soldering on VR's.
o okay i will buy one =]
hmm so once i get a digital mm and i solder a 20k vr on, will i be able to adjust the voltage? or will the voltage auto adjust to whatever my oc is.

I'm beginning to feel like bailing =[ the uP6201 is really really really small and the pins are even smaller ><
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post #110 of 1498
Quote:
Originally Posted by LIU_ZOMG View Post
o okay i will buy one =]
hmm so once i get a digital mm and i solder a 20k vr on, will i be able to adjust the voltage? or will the voltage auto adjust to whatever my oc is.

I'm beginning to feel like bailing =[ the uP6201 is really really really small and the pins are even smaller ><
Once we verify the resistance with a DMM then you will solder on the appropriate size resistor. And you dont have to solder directly to the uP6201 IC, we can find an alternate mod point located at one of the resistors around that IC which is a lot easier to solder on. I completely agree that the pins are very small and I have never soldered directly to an IC that small, only ones like your uP7701 have I soldered directly to. And you will have to adjust the voltage manually to compensate for the increase in frequency on the core. Dont give up yet, you will thank me later once you see the results and feel the sense of accomplishment from a functional mod along with the HW points

@PizzaMan, I found another IC which is for the 4870 and another data sheet link as well, I am on a roll tonight

Also found another datasheet link and the uP6201 sheet in a page or two back

http://datasheetz.com
Edited by Voltage_Drop - 1/5/10 at 6:48pm
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