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View Full Version : WTF, vcore mod on Asus P4C800 decreases vcore?

crotale
07-31-2005, 09:05 AM
ok guys, followed a guide for vcore mod on P4C800 and double chacked with a pic from macci, so the mod is done the right way AFAIK.
But as soon as I plug it in the vcore drops .04V and if I turn the VR it continue to decrease.

What is going on here?

http://www.nordiccrew.com/crotale/sonoma/vcorevdroop.jpg
heater918
07-31-2005, 12:41 PM
Set VR@28k before mod. Lot of bare wire on 1 lead. What is third wire in pic.
50k VR?
micdoc
07-31-2005, 01:16 PM
here is your answer (http://www.xtremesystems.org/forums/showthread.php?p=775271#post775271)
persivore
07-31-2005, 01:38 PM
I've done the same mod before, and it works fine. I did use a different solder point tho (see attachment), but it looks like the point that you used and the point that I used are connected, from your picture.

Are you sure that the VR is grounded properly?
crotale
07-31-2005, 09:54 PM
Set VR@28k before mod. Lot of bare wire on 1 lead. What is third wire in pic.
50k VR?
The two right leds are for vdroop, and the VR was set to 27k.
droop is fine, just 0.02 idle-load.

Problem is vcore, the one to the left, which is going to ground.
Ground is the FAN header's ground. I'll try another ground.
crotale
07-31-2005, 09:55 PM
I've done the same mod before, and it works fine. I did use a different solder point tho (see attachment), but it looks like the point that you used and the point that I used are connected, from your picture.

Are you sure that the VR is grounded properly?I'll double check if they're connected.

*EDIT* They are connected, will try another ground now...

*EDIT2* Found the problem. The "ground" in the FAN header located there is not ground, it is +5v!
heater918
08-01-2005, 12:51 PM
Glad you got it going. Working as advertised i presume :)
crotale
08-01-2005, 09:29 PM
Glad you got it going. Working as advertised i presume :)
Yes it does, but I just managed to play with it for a couple of minutes before my motherboard started to act extremely strange.
Been working flawless for more than 3 days but now I need to have it mounted to a metal plate to get it to post. I guess there are some grounding issues.

Besides that, what do you guys use to solder on these Asus boards? I can't get the solder on the board's components to melt.
Much easier on Abit.
CaTalyst.X
08-01-2005, 11:15 PM
I use .022 62/36/2 Silver Bearing Rosin core solder from radshack

-CaT