Heat sink assembly
All heat sink assembly spare part kits include replacement thermal material.
Description Spare part number
Heat sink assembly:
For use in models with discrete graphics and all processors except for the Intel i7-4558U 768050-001
For use in models with discrete graphics and an Intel i7-4558U processor 768049-001
Before removing the heat sink assembly, 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 35).
5. Remove the following components:
a. Service doors (see
Service door on page 36).
b. Hard drive (see
Hard drive on page 38)
c. Optical drive (see
Optical drive on page 42)
d. WLAN module (see
WLAN/Bluetooth combo card on page 44)
e. Keyboard (see
Keyboard on page 46)
f. Top cover (see
Top cover on page 49)
g. System board (see
System board on page 67)
Remove the heat sink assembly:
1. Position the system board upside-down.
2. Models are available with discrete graphics.
Discrete models:
a. To remove the heat sink assembly, in the order indicated on the heat sink, loosen the 6 captive
Phillips screws (1) that secure the heat sink to the system board.
Component replacement procedures 73
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