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4. Lift the right side of the system board up at an angle (2), and then lift the system board up and to
the right to remove it (3).
Reverse this procedure to install the system board.
Heat sink
NOTE: The fan and heat sink are combined into one assembly. All fan/heat sink spare part kits
contain replacement thermal material.
Description Spare part number
Heat sink for use in computers with discrete graphics 683860-001
Heat sink for use in computers with UMA graphics 683861-001
Before removing the heat sink, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn
the computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet,
and then unplugging the AC adapter from the computer.
4. Remove the battery (see
Battery on page 31).
5. Remove the following components:
a. Bottom door (see
Bottom door on page 33).
b. Hard drive (see
Hard drive on page 37)
c. Optical drive (see
Optical drive on page 35)
d. WLAN module (see
WLAN/Bluetooth combo card on page 43)
Component replacement procedures 63