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Heat sink
All heat sink spare part kits include replacement thermal material.
Description Spare part number
Heat sink for use in computers with UMA graphics 646283-001
Heat sink for use in computers with discrete graphics 646284-001
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 47).
5. Remove the following components:
a. Bottom door (see
Bottom door on page 49).
b. Hard drive (see
Hard drive on page 52)
c. Optical drive (see
Optical drive on page 50)
d. WLAN module (see
WLAN/Bluetooth combo card on page 58)
e. WWAN module (see
WWAN module on page 56)
f. Fan (see
Fan on page 93)
g. Heat sink (see
Heat sink on page 95)
h. Keyboard (see
Keyboard on page 63)
i. Top cover (see
Top cover on page 65)
j. System board (see
System board on page 85)
k. Fan (see
Fan on page 93)
Remove the heat sink:
1. Position the system board upright.
2. To remove the discrete heat sink, in the order indicated, loosen the six captive Phillips screws
(1) — (6) that secure the heat sink to the system board.
Component replacement procedures 95