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Removal and replacement procedures
Maintenance and Service Guide 4–55
Heat sink assembly
Before removing the heat sink assembly:
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 disconnecting the power cord from the AC outlet and then
disconnecting the AC adapter from the computer.
4. Remove the battery (see “Battery” on page 4-7).
5. Remove the following components:
a. Hard Drive (see “Hard Drive” on page 4-8)
b. Memory module (see “Memory module” on page 4-10)
c. Mini Card compartment cover (see “RTC battery” on page 4-12)
d. WLAN module (see “WLAN module” on page 4-15)
e. Optical drive (see “Optical drive” on page 4-19)
f. Keyboard (see “Keyboard” on page 4-20)
g. Keyboard cover (see “Keyboard cover” on page 4-23)
h. Speaker assembly (see “Speaker assembly” on page 4-26)
i. Display assembly (see “Display assembly” on page 4-27)
j. Top cover (see “Top cover” on page 4-34)
k. System board (see “System board” on page 4-50)
Description Spare part number
System board (includes replacement thermal material)
UMA graphics subsystems 591957-001
Discrete graphics subsystems 591956-001