As far as I am concerned you cannot change a laptop's cpu since it is an on board chipset. The only thing you can do is to change the whole motherboard platform which is a bit of craziness to do
Hope this helps!
Weird, My laptop originally came with an AMD Athlon Ql-62 and then I upgraded to an AMD Turion Ultra X2 ZM-85. I was aware of some people, that got the AMD Turion II's (S1G3 CPU) to work on older S1G2 motherboards.