Remove the seven screws (circled in red) securing the CPU heatsink to the palmrest, and then lift off the heatsink.

Note: The heatsink has built-in thermal pads that are placed on the CPU and chipset, so you will not need to use thermal paste.

Use a flathead screwdriver and turn the CPU retaining screw 180° counterclockwise to loosen the CPU from its socket.

Gently lift the CPU from the socket.