Please Help, soldering questions

[Laptop_wizard]

I am going to solder a 2.2k ohm resistorto my P3 cpu, what risk do i kneed take, and how do i solder it on? is it possible to easyly damage my CPU.
Thanks

[egibbs]

Why?

You need to know what you are doing - it doesn't sound like you do.

Yes.

[Laptop_wizard]

Hey egibbs Thanks for your reply, and the reason why is I have to do this to disable speedstep, I have a 600MHz CPU but only reads 500MHz
Because my motherboard dosen't allow it to step up.
Any advice would be great, what do I have to do.
thanks

[egibbs]

You will need a low wattage iron (25 watts or less) with a grounded tip. The tip should be as small and thin as possible.

You need to do it with power off, of course, (including removing the CMOS batt) with the board on an ESD safe grounded work surface (buy an ESD mat and ground it).

Wear a wrist strap.

Get a junk board and practice, practice, practice.

I'm not even sure if the pin layout on your processor allows you to get at the pin you need, but I assume you have already determined it is possible. If you have a ball-grid array or some other high density pin layout forget it.

[Laptop_wizard]

Hey, and thanks, the hole is already there, I will be soldering onto a MMC2 modual, Will a 30 watt be ok, or can i just do the soldering before the iron fully heats up, go to WWW.XABK.CO.UK goto mods and there you will see what I am trying to do. what kind of solder do i Kneed?
thanks for your help.

[egibbs]

As I said, get a junk board and practice - a lot.

Or you could just jump in and try it with no experience on your MB, in which case you will soon have a junk board to practice on.

Standard 60/40 solder should be ok.

Get a low wattage iron. The higher the heat the less margin for error, and you'll be making errors.

Ed Gibbs

[jdhurst]

Follow Ed's advice. I repaired the front-end of a Tektronix Active FET probe once. The parts were tiny and the work was fiddly (and successful - I can still use the probe). But tiny as the parts were, they were still much large than the pins on a laptop CPU. I wouldn't try it, and I have a lot of practice at soldering. ... JD Hurst