What would you say about possible reason for this failure

[Pepi]

Recently I tried to unlock a 750MHz Duron in order to use it with higher FSB and lower multiplier. I short-cutted the L1 bridges and tried to run the system. Suprisingly It did not boot. Checked the bridges - were OK. Tried 5-10 more times and gave away. After I removed the lead (I used lead pencil) the system did not post again - I had already had givven up after an hour when the system booted up. (this would have been the last try ) Does anybody know what could have happened?

 

[cookieman]

Are you sure you haven't shorted the bridges between them somehow ?
To remove the lead use rubber, a lot...

Any signs of smoke, or other stuff on the core ? (hope not)

Cheers,

 

[Pepi]

looked it all over - no signs of links between the pins - nothing bad looking

 

[Pepi]

looked it all over - no signs of links between the pins - nothing bad looking
removed the lead by a fine cloth and some spirit (still don't know if it is not bad for the CPU)

 

[MrThompson]

Most solvents won't damage the CPU although they can interfere with the thermal compound. Simply penciling the L1 bridges and then removing the lead will not damage the CPU. Are you certain removing and installing the HSF did not damage your core? Also, the first sign of overheating is a brown goop (the stuff that smells) around the base of the CPU die on the ceramic plate. You may need a magnifying glass to see it.

 

[Boonesmi]

im not sure i understand your original post

it almost sounds like you cut the L1 bridges?

link
just in case the link above gives pretty good directions on how to unlock a cpu

 

[Pepi]

It works absolutely fine now, but on 750MHz. The short-cut -> (just linked them)

The question was - what could have happened so I could not make it run on 133x6 for example?

 

[cookieman]

Only rising the FSB or the multiplier is not enough to have a successfull OC.
You must increase the core voltage aswell. At 6x133 it may need only a small voltage increase (max 0.1)
Also I can not see what your motherboard type is. Are you sure it supports 133 FSB? KT7 do not only the KT7A series and above supports 133.

Cheers,

 

[Pepi]

The system did not even POST.(I was not even able to boot at default
FSB and multiplier in order to change after that)

The MB is KT133A - it is all right (exuse me for not mentioning it).

 

[cookieman]

Hi!

Well,

1. Unplug the system, clear the BIOS with the jumper. Wait a little. Put that jumper
back.
2. Plug in, power. It should post at default speed.
3. Enter bios, Up the voltage at 1.75 or even 1.8.
4. Put the multiplier at 6.5 FSB 133
*****************************************************************************
But be sure to put the memory only at CLOCK and not CLOCK+PCI !!!!
It would be too much for PC133 SDRAM to run at CLOCK+PCICLOCK -> 133+33!!!.
(read you mb manual how to change this: bios or jumpers)
*****************************************************************************
4. Save, quit bios, reboot.

It should work like this...
If it's working then you can try 7x133 or more (but it can require as much as 1.85V core
voltage). Watch your temps.

Cheers,

 

[Pepi]

I tried the CMOS clearing, but it didn't boot, so I couldn't go to the other
steps listed. Thanks for your posts - It's a shame my case was not such a one so these
steps to be applicable.

 

[cookieman]

I have no other ideas right now.
anybody?

Cheers,