I have successfully done a little circuit board repair soldering when necessary. I am trying to remove and replace the female plug on a laptop motherboard. However, the solder on that part seems to be some kind of different compound and will not melt. It looks gray, like normal solder, but it's duller. I know how to use the copper braided stuff to remove solder and everything, but this stuff, even with the iron heald against it for some time, just will not liquefy.
HELP!!
HELP!!