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vMOD ASUS 5450 - Page 2

post #11 of 26
dbl post
post #12 of 26
I have circled four resistors ... can you see which of them have continuity or 'tone' to ground? I believe the 'FB' pin we need is one of these resistors, based on the readings you took. The point to mod, will be connected to ground on 1x side of the resistor only..and likely have a initial value of 1-4 kOhms.

[ATTACH]221474[/ATTACH]
post #13 of 26
Thread Starter 
sir i have checked all 4 points u mention ...all 4 points give continutity from both sides to gnd ...please tell which one is feedback then..
post #14 of 26
Thread Starter 
sir on checking continuity its giving on all points frm both sides(continuity light glow but not bright on all points except that three points which tone out) but on checking tone out its given only on 3 points mention in picture below:-


1050052.jpg
Edited by jassi - 7/25/11 at 5:35am
post #15 of 26
Thread Starter 
also sir these tone out 3 points doesnt give any value @20k multimeter setting ..
post #16 of 26
Quote:
Originally Posted by jassi;14337659 
also sir these tone out 3 points doesnt give any value @20k multimeter setting ..

No value = 0 ohms.. or ground, this is good.

lets start with this resistor..and pencil the value down a small amount at a time [ie- from 4.8k to 4.3k ..] Its best to shut-down for the first few times you make changes with the pencil..and monitor the GPUv output as you boot up. DO NOT use 3D or even load your OS..keep it in BIOS only for testing.

You should see GPUv move as resistance decreases.. if you are not seeing changes, note the level of resistance you set & clean off the resistor to return it to stock value. One of the 3x points you indicated should indeed be linked to 'FB' pin on the IC.. *fingers crossed* ..we get it right the first time.

Pencil 'green' resistor and monitor GPUv output for changes.
[ATTACH]221537[/ATTACH]
post #17 of 26
Thread Starter 
Check out the pic and tell me if i am predicting right...

1050052.jpg
Edited by jassi - 12/2/13 at 10:59pm
post #18 of 26
so lowering resistance = lower voltage too huh..? Only had a few GPU's ever do that. Sounds like you may have found the FB pin.. but will need a soldered VR on there to increase resistance and gain GPUv.

{R*20} = Potentiometer size required for vmod
post #19 of 26
Thread Starter 
I shade the whole resistor and and value decrease ..sir can u please tell me that which end of resistor i have to soldered with VR as one side giving no value and other side giving 1.25 value ...have i soldered that end which is giving the 1.25 value ?
Edited by jassi - 12/2/13 at 11:00pm
post #20 of 26
Quote:
Originally Posted by jassi;14352995 
solder the end which is giving the 1.25 value

wink.gif *fixed

{1.25k*20} = ~25k .. so 20k VR [pot] should work fine ..since this is a 'reverse' FB though, you may need something like a 50k to increase resistance+GPUv enough to suit your needs. Just make sure you set the resistance back to the stock value, once you have a potentiometer soldered in. Then increase resistance with the GPU running and monitor voltage.
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