See if your laptop has a service manual so you can dive in. Be sure you backup what you can't lose since some first repair folk sometimes wipe out.
My laptop touch pad works perfectly when I put it on my lap or if I put my hand at the back of it. But when I put it on a table the touch pad doesn't work properly. I have tried to put the lap top on a metal plate and it doesn't work as proper. What could be the problem?