GA-EP45-DS3R Vdroop Mod

[shauntx]

Okay I have a GREAT chip however I have a MOBO that has one of the worst vdroops known to man! GA-EP45-DS3R can someone please tell me if there is a pencil mod or some type of mod to fix the vdroop from hell? PLEASE HELP ME....:shocked:

http://i257.photobucket.com/albums/hh219/shauntx/MOBO.jpg

[ceemic]

Measure resistance between pin 16 and 17: http://www.intersil.com/data/fn/FN6482.pdf
Also do a macro closer to that IC. Try to look, where the pins head to and use DMM to confirm.

Don't use flash-light and aim a good result like this: http://ceemic.pri.ee/hardware/tpower/tpower20.JPG :)

[shauntx]

So looking below at Largons picture I'm going to have to solder a line from pins 16 & 17? I'm sorry if these are dumb questions its my first mod and and the vdroop is just horrible! Please correct me if I'm wrong.


I made a quick mock-up of Hicookie's written guide.
Pins 16 & 17 are marked with red dots but since the pic isn't detailed enough I can't pin point the best soldering points. The legs of ISL6336 might not be too easy to solder on, you'll have to follow the trace that leaves from each pin and find a usable soldering point. Or, you can post a detailed macro pic of the area so I can find & mark actual soldering points.
84414

Thanks.

[shauntx]

Okay I found a picture that shows pins 16 and 17 please tell me if I'm correct in soldering the two with 1 connecting line. Please look below

http://i257.photobucket.com/albums/hh219/shauntx/EP45-DS3R_vDroop.jpg


Below I drew a red line of basically that I think you meant by connecting the two pins (soldering).

http://i257.photobucket.com/albums/hh219/shauntx/untitled.jpg

[ceemic]

No You don't solder them together but You have to use a variable resistor between them. You have to look and measure where the lines heading to (te pins are too small to solder directly). You can use DMM (set it to lowest resistance). Place one stick to pin16 (be careful NOT TO SMASH IT!) and the other DMM stick to the nearest components. You have to get 0,00ohm reading so You know the line heads there. Do the same with pin17.
Probably they head somewhere:
http://ceemic.pri.ee/hardware/EP45-DS3R_vDroop_1.jpg
Now measure resistance between these to points. Also measure resistance directly between pin16 and 17. These values must be almost the same (the lines add a little more resistance, so the value in direct to pins are little bit smaller).
Note that You have to uninstall all components from Your mobo, before You measure.
If You have the reading, You can give it here also. The VR You have to use, must be 10 to 20 times the value You get.
For example: if You get 5000ohm (5kohm) You can use 50k or 100k VR.

[shauntx]

so if I find where both pins lead to (if they lead to each other) I can do a pencil mod correct? I'm sorry if this seems like stupid question.

[ceemic]

Basically yes. In theory the end up in one resistor which controls Vdroop. For example in my Biostar its like that: http://ceemic.pri.ee/hardware/tpower/tpower20_mod.JPG
It can "pencil moded" or hardmoded (what I have done) :)

[ewitte]

I see three red dots on the picture besides the chip, where is the pencil mod done? Lol I really need to do something bad.