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4–50 Maintenance and Service Guide
Removal and replacement procedures
Fan/heat sink assembly
✎
The fan/heat sink assembly spare part kit includes replacement thermal material.
✎
To properly ventilate the computer, allow at least a 7.6-cm (3-inch) clearance on the left side of the computer.
The computer uses an electric fan for ventilation. The fan is controlled by a temperature sensor and is designed
to turn on automatically when high temperature conditions exist. These conditions are affected by high external
temperatures, system power consumption, power management/battery conservation configurations, battery fast
charging, and software requirements. Exhaust air is displaced through the ventilation grill located on the left side
of the computer.
Before removing the fan/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 6).
5. Remove the following components:
a. Hard drive (see “Hard drive” on page 8)
b. Memory module (see “Memory module” on page 10)
c. WLAN module (see “WLAN module” on page 11)
d. WWAN module (see “WWAN module” on page 15)
e. SIM slot board (see “SIM slot board” on page 16)
f. RTC battery (see “RTC battery” on page 18)
g. Optical drive (see “Optical drive” on page 19)
h. Keyboard (see “Keyboard” on page 21)
i. Switch cover (see “Switch cover” on page 25)
j. Speaker assembly (see “Speaker assembly” on page 27)
k. Display assembly (see “Display assembly” on page 28).
l. Top cover (see “Top cover” on page 37).
m. System board (see “System board” on page 47).
Description Spare part number
For use only with computer models equipped with graphics subsystems with
discrete memory
531814-001
For use only with computer models equipped with graphics subsystems with
UMA memory
531813-001