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This section provides instructions on how to replace the heat sink assembly.
CAUTION:
The heat sink and fan assembly might be very hot. Turn off the computer and wait three to ve
minutes to let the computer cool before removing the computer cover.
To replace the heat sink assembly, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Place a soft, clean towel or cloth on the desk or other at surface. Hold the sides of your computer and
gently lay it down so that the screen is against the surface and the cover is facing up.
3. Remove the computer cover. See “Removing the computer cover” on page 71.
4. Remove the VESA mount bracket. See “Removing and reinstalling the VESA mount bracket” on page 71.
5. Locate the heat sink assembly on the system board. See “Locating major FRUs and CRUs” on page 63.
6. Remove the system board shield. See “Removing and reinstalling the system board shield” on page 76.
7. Remove the screw 5 , and then 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.
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.
Figure20. Loosing the screws that secure the heat sink assembly to the system board
Chapter 9. Replacing FRUs 79