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6. Follow the sequence 1 , 2 , 3 , 4 on the heat sink assembly to loose the four screws that secure the
heat sink assembly to the system board. Remove the screw 5 that secure the heat sink assembly
to the computer.
Note: Carefully loose the four screws from the system board to avoid any possible damage to the
system board. The four screws cannot be removed from the heat sink assembly.
Figure 27. Loosing the four screws that secure the heat sink assembly to the system board
7. Lift the failing heat sink assembly off the system board.
Notes:
a. You might have to gently twist the heat sink assembly to free it from the microprocessor.
b. Do not touch the thermal grease while handling the heat sink assembly.
8. To reinstall the heat sink assembly, position the new heat sink assembly on the system board so that the
four screws are aligned with the corresponding holes in the system board.
9. Follow the sequence 1 , 2 , 3 , 4 on the heat sink assembly to tighten the four screws to secure the
heat sink assembly to the system board, as shown in Figure 27 “Loosing the four screws that secure
the heat sink assembly to the system board” on page 91. Install the screw 5 to secure the heat sink
assembly to the computer.
10. Reinstall the system board shield. See “Removing and reinstalling the system board shield” on page 83.
11. Go to “Completing the parts replacement” on page 108.
Replacing the microprocessor
Attention: Do not open your computer or attempt any repair before reading and understanding the
“Important safety information” on page 1
Chapter 9. Replacing FRUs 91