AN7 vdd-mod?

[tictac]

Originally posted by Dekal
It seemed it can't be used for AN7, tictac.
How can i increase voltage of the right fet in the picture without damaging mainboard?

here i show u how... solder 10K pot shown in this picture... but make sure to cut th trace 1st before u try this 1... Set the pot to maximum resistance... and lower the resistance to get higher vdd

[rufsen]

Have anyone tried it out yet? Would damn like to know if so! Wanna go higher than 1.75 cause I can only do 220 @ 1.75 and 215@1.70 so I really think that the VDD is tha problem for me.

[magma]

Has to be absolutely cut there? Why?

[magma]

double post *

[A-38]

There must be another way, cutting the traces on my motherboard is not an option.

In stead of cutting the trace by the 'G' it should be better to remove the 0k resistor to the upper left of the 'G' since it's directly connected to the lower right leg (output 3.48v) on the LM358.

Or maybe we could unsolder and bend up the left pin on the mosfet to the right and solder the 10k pot on to it, then it shouldn't be nesseseary to cut the traces.

I'm NOT in to electronics this is purely n00b thinking, but does it sound like somthing that would work???

[tictac]

there is other way if u dont want to cut any trace on ur board

we can by pass the vdd voltage from vdd mosfet

just solder a wire from the source to output leg......

u can use pot to adjust the desire voltage...

GL....

[A-38]

Not sure what you mean, would you post a picture that shows it all?

[tictac]

Originally posted by A-38
Not sure what you mean, would you post a picture that shows it all?

here like this....

[A-38]

Ah that seems fairly easy, I think I'm gonna' try it out when I get me a 10k pot.

[tictac]

if u dont use resistance just a wire connecting 2 points there... u will get about 2.4V something like that for vdd

so choose
good pot to lower that voltage..... to your desire voltage

[A-38]

I think I'll try a fixed resistor first, how many ohm's do I need to get about 1.85-1.9v VDD?

[tictac]

u need to test that.. i didnt know exact ohm for that voltage...

[A-38]

Ok then.
Well thx a lot for your help!!!

[A-38]

I measured the voltage on the 'back' side of that mosfet and it seems that there issn't any voltage there.
So as far as I can figure out this mod wount work!

[tictac]

r u sure... :-/

[A-38]

Thats strange I was unable to measure any voltage there yesterday but today it says 2.57v.

Well are you sure this mod wount burn anything? cuz then I'm gonna try again.

[A-38]

Well tryed out the mod and it didn't work no matter how low the resistance on the pot meter was the VDD voltage stayed at 1.73v

[Dekal]

Aren't there any changes @ right mosfet (right pin) if you solder the pot? I think there have to be higher voltage on mosfet. What about the LM358? Doesn't 2 voltages (1.71) @ right pins of LM358 differ with pot?
Maybe we can't change VDD with that method...

[tictac]

the source is @ 2.57V..... maybe yor pot is not lower enough...

coz 2.57V should overwrite vdd voltage easily if the pot resistance is low enough... try smaller pot...

[A-38]

I used a 10k pot and got down to about 1.5kohm and then thought things wouldn't work.
I'll try again sometime during this week!

[magma]

FU** ---> Kills my 255 Fsb Board ;(

[tictac]

Originally posted by magma
FU** ---> Kills my 255 Fsb Board ;(

why do kill her

[magma]

with that cut trace isn`t good.
my new does not go however better, although it is newer.

[tictac]

then connect it back... the board will live again

[AdvModDev]

Originally posted by Hell-Fire
Well, I have not worked on an AN7....but I will see what I can dig up on it.

Any progress? I'll be getting one of these boards next week...more VDD is the only mod that's really required. There's certainly enough Vcore (2.3V) and Vdimm (3.2V). But the VDD is only 1.75V, WTF?

O/T

I found the VDIMM mod for this board:



http://www.vr-zone.com/?i=759&s=1

Hell-Fire, can you confirm this? The guy says to remove resistor R316 and replace with a 1K VR set to 0 and increase for more voltage. Does the resistor have to be removed? Why not just solder the VR directly to the resistor? Also, does this board need the VTT mod like the NF7? Can someone post a pic w/ all the voltage measuring points for this board?