We don't know exactly how to go about removing the CPU and heat sink from each other.
This depends on the CPU and the heat sink. The heat sink is fastened to the socket on the motherboard on two sides. It will be fastened to a tab on each side. In all likelyhood, the heat sink will have some sort of handle on it. AMD processors these days have a little lever that must be moved from the far right position up to the center. This loosens the heat sink and you can reach down to unhook first the side with the lever from the socket and then the back side. Intel processors seem to have a flat metal piece that must be pushed down to relieve tension on the clamp. As you do so, you have to get down by the socket on the motherboard and push the metal clamp away from the socket. This takes some doing, as it's quite tight. Once you have released the one side, the second side is loose and can be unfastened.
The heat sink can now be pulled up (use a slight twisting motion if possible to break the seal between the heat sink and the CPU. If the computer is several years old, the seal will be hard to break.
Turn off the Satellite laptop and flip it over so you can see the bottom. Push the battery latch towards the outside of the laptop and remove the battery.
Locate the heat sink panel, which will be next to, or including, the two fans that you can see. Unscrew the two to three screws that are holding that panel down, and remove them.
A few models of Satellite laptops use Torx sized-8 screws instead of Phillips.
Unplug the cables running from the two fans to the control board.
You can see the cables coming up from under the fans.
Then unscrew the two to three screws on the fans, and pull up to remove the fan unit from the laptop.
If your Satellite heat sink panel does not uncover the fans as well as the heat sink, ignore this step.
Remove the four screws that surround the heat sink.
Then move the heat sink back and forth to disconnect it from the CPU.
If your laptop shuts down by itself without any reason, check the heat sink first.
Overheating is a very common problem among Toshiba laptops.
Lift up on the heat sink to remove it from the unit.
If the CPU got caught on the heat sink and comes off as well, grasp it by the edges and peel it off the heat sink.
Turn the screw on the side of the CPU socket to unlock it, then place the CPU back in its socket and lock it again.
Blow compressed air into the heat sink and the fans until the dust is removed.
Then blow the air onto the control board to remove loose dust from there as well.
Place some Isopropyl alcohol onto your cloth, or a small brush, and clean the processor and the control board area around the processor.
You will also want to wipe up the thermal grease that is on these components. Make a note of the area where you removed the thermal paste.
Reapply a layer of thermal grease in the areas where you removed it.
The lid of the thermal grease container will have an applicator.
Just spread the grease over the components.
http://www.hardwaresecrets.com/article/Thermal-Compound-Roundup-February-2012/1490
Replace the heat sink, then the fans and finally the heat sink panel cover.
hope this helps
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