Maybe it will be useful for someone. I have just replaced (actually removed) the thermal pads on the 9600M GT GPU in my Xi 3650. Here is how I did it:
I. Removing the heatsink
1. Unscrew the five screws at the bottom of the laptop that holds the largest piece of plastic. Under it you will find the heatsink for the CPU, and the two GPUs.
2. Place the amilo in a way that the copper part of the heatsink is on the left, and the RAM is at the top.
3. Unscrew the four silver screws on the CPU.
4. There are two more silver screws attached to the heatsink, one to the left of the CPU and one at the bottom-right.
5. Unscrew the two black screws that hold the vent.
6. Unplug the vent (be careful not to break the cables) .
7. Remove the vent.
8. Remove the heatsink by gently wiggling it a little while pulling it to the right. The only thing that keeps it there is the sticky thermal pads and thermal paste on the CPU.
9. Wipe your sweat
You have succesfully removed the heatsink.
II. Replacing the thermal pads
1. The CPU has old thermal paste on it, wipe it clean. Wipe the remainder from the heatsink too.
2. Remove the thermal pad off the nVidia GPU (it is the bottom one). Use something sharp to avoid braking the pad, just in case you need it again (e.g. warranty reasons)
3. Remove the blue thermal pad off the memory chips next to the nVidia GPU. Be careful, you will need it!
4. The blue thermal pad (that you just removed from the memory) is too thick. Cut one slice from it, just the same size as one of the memory chips. Then with a knife carefully cut it in two in a way that at the end you have two memory-sized pads with half the width. This requires a bit of dexterity, but it is doable.
5. Put the created half-as-thin pads back to the two memory chips.
6. Put thermal paste to the GPU, not too much, about half the size of the head of a match. I used Spire 420, but I guess it is not the paste that matters but the fact that you remove the pad from between the GPU and the heatsink.
7. Put thermal paste to the CPU.
8. Put back everything in reverse order.
9. Don't forget to replug the vent!!
This mod has resulted in about 15 C decrease in the temperature of the nVidia GPU!! Now I cannot go over 83C even with the GPU overclocked from 500MHz to 650MHz. My idle temperature is 55C.
I hope you find this mod usedul. I certainly do