voltage mod troubles (kinda)

[Menardsguy]

I just did avoltage mod, but i can't get it to boot up with the resisters in... It works fine when I take them out,
but when I put them in it doesn't boot. I was wondering what resisters I should use. Right now I only tried two 10K. The guide doesn't really say what the different resisters will do on the voltage regulator. I'm going to go back to radio shack and get some more, probably a 5.6k and try that on the voltage regulator. I think that is my problem. If the 5.6k doesn't work, I'll go to 4.6k then to 3.3k. 3.3k is as low as I will go though since it allows voltages to go as high as 2.7 volts. I assume that 5.6 will work though. I only want to go as high as 2.33 volts or close to that.

here's the voltage mod i used
http://www.extremeoverclocking.com/...tage_Mod_1.html

[Colin]

Fixed resistors for a volt mod are not a good idea. While well intentioned, the authors of arcticles that recommend them don't have enough experience with multiple boards to know they are a problem. Because the tolerances of the parts on a motherboard vary, a varible resistor (pot or trimmer) is a much better solution. This way you can tune the resistance your particular board needs to complete the mod successfully.

The value for the Pin 7 resistance on your board varies from 20k to 30k. Use the method below and you don't even need to know the value.

Here are my instructions for boards that use the Intersil HIP6301.

KT7 series, KK266, etc:

Solder wires to Pin 7 and Pin 10 of the IC that controls the voltage to the CPU. Put a 47k trimmer (49 cents at Radio Shack part # 271-283) between Pin 10 and ground. Put a 100k trimmer (271-284) between Pin 7 and ground. You can add a 1k trimmer (271-280) in series with the 47k trimmer if you would like to make it easier to fine tune the voltage. Use a spade lug or loop under a motherboard mounting screw for your ground connection. For convenience I suggest you mount the trimmers on a piece of breadboard and secure it to your motherboard tray with Velcro.

Pin 7 controls the voltage, Pin 10 controls maximum voltage threshold. Turn the trimmers to full resistance boot your PC and start VIA Hardware Monitor. Set the polling interval to 2 seconds and slowly dial up the Pin 7 trimmer until the screen blanks. Your PC will probably reboot when the screen blanks. Note the voltage and back it off a tad while the computer reboots. Then dial up the Pin 10 trimmer until your screen blanks and back it off a tad. Go back into VIA Hardware Monitor and dial the Pin 7 trimmer up to 2.3 volts. You may be able to go higher but I don’t recommend it.

Caution this will stress your cooling. Be careful or your CPU could end up a crispy critter. I also suggest buying a third hand device from Radio Shack to hold a pre-tinned wire to the IC leg while you solder. The magnifying glass on the third had will come in handy too. Get in and out fast so you don’t toast the IC. Lay off the caffeine and if you are of age, have a beer a half hour before soldering to steady your hands.

Be sure to tie your wires down to the board. A dollop of five minute epoxy works well for this. After doing several boards, I finally screwed one up. The mod went fine but I snagged the wire to Pin 10 on the end of my workbench and ripped the IC pin right off the board.

[SickBoy]

You're not using enough resistance. You're probably over the voltage threshold. That's why you're not booting with a resistor in but it's ok without one.

[TheStapleGunKid]

hey guys,
I just performed the volt mod last night, but now the machine powers up...but won't POST. I was just wondering if there could be somthing i'm missing. I hope i didn't destroy the mobo as i was extremely careful in my soldering. If the IC does detect an overvoltage situation...would that cause the machine not to POST. And then what must you do to reset the IC.

Any help would be really appreciated

[SickBoy]

Originally posted by TheStapleGunKid
hey guys,
I just performed the volt mod last night, but now the machine powers up...but won't POST. I was just wondering if there could be somthing i'm missing. I hope i didn't destroy the mobo as i was extremely careful in my soldering. If the IC does detect an overvoltage situation...would that cause the machine not to POST. And then what must you do to reset the IC.

Any help would be really appreciated

We need more info here. What board do you have, what values of pots did you use, what pins did you solder on to , etc....

[TheStapleGunKid]

I have a KT7 RAID.
The guide i followed is the one that is posted in the first message of this thread. I followed it exactly, except i soldered to the solder pad by R131(furthest away from AGP slot). I performed the overVoltage safeGuard mod as well (solder to pin 10 VSEN of IC).
All i keep gettin upon power up... is the computer comes on.. but the monitor never comes out of hibernation. I've tried 47Kohm on the pin10 one, and 15KOhm on the voltage side.

thanks

[Menardsguy]

I've had mine working for a while now... I used a 10k ohm on the voltage rugulator and a 4.7k ohm on the soldier pad... I have a pic and some more infor here-

http://forums.overclockers.ws/vb/showthread.php?s=&threadid=57020