I Made Voltage Mod On KT7E But....

[Cyrex]

I made voltage mod on KT7E but nothing happens when i put on the power it doesn't boot up! I was scared to death i thought i screwed my board with the soldering (too hot or something arggg). So i double checked if the wire was conected properly but all was good connected! cleared cmos with pin put power on but still nothing after that i cut the wire and my system runned again! Phoeie aaaah! So what did i do wrong and anyone had the same problem? I think i used a too small wire and did not have enough resistance!
I used a 3mm wire, maybe if i put a bigger wire between those two leftover wires it works!?

Cyrex...

 

[AXIATOR]

Hi,
a bigger wire wont help but a bigger resistor or a potentiometer soldered in line with the resistor.
Maybe you nedd a better powersupply i.e. 300W with 12V/12A .

Greets from Germany
Olaf Lampe

 

[Cyrex]

I have 300w 230v 4A power supply must be good enough or not?

Cyrex... From Holland!

 

[Colin]

I am going to guess you used a resistor. This is the most common reason for a board not booting. I wish the irresponsible hardware Sites would quit publishing this fixed resistor drivel. Not all boards require the same resistance. Use a trimmer. Below are my standard KT7 series volt mod instructions.

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 each wire and ground. 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 voltage peaks. This should be about 2.1 volts. Then dial up the Pin 10 trimmer until your screen blanks and back it off a tad. Your PC will probably reboot when the screen blanks. 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. 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.

[img="[URL]http://albums.photopoint.com/j/View?u=1551335&a=11768501&p=42534658[/URL]"]

 

[Hoot]

Did you do both the Phase 1 and 2 mods? If you only enable the programmable regulator to put out more voltage and do not increase the Over Voltage Protection threshold, then when you get somewhere between 2.05 and 2.1V you will trip the OVP circuit. You have to unplug the AC power cord for about 20 seconds for it to reset. Hopefully, you used a variable resistor instead of a fixed resistor. Just turn the resistance up to maximum and you should be able to boot. The problem will not go away until you perform the Phase 2 mod.

Hoot

 

[Colin]

The resistor values used in the voltage mod articles may yield 2.14 volts in some of the current KT7 series boards. As Hoot pointed out, without the stage two mod, the boards won't boot. I have yet to see a board that could not reach 2.1 volts with the stage 1 mod. With the current crop of Birds overclocking at lower voltages, this may be all you need. All of the Birds I have tested have a sweet spot of 2.06 volts except for the latest dog 1333 AXIA. It's getting replaced next weekend.