Fan and heat sink assembly
Description Spare part number
Fan and heat sink assembly (includes replacement thermal material) 598452-001
Fan and heat sink assembly, for use with dual-core models (includes replacement thermal material) 627790–001
NOTE: To properly ventilate the device, allow at least a 7.6-cm (3-inch) clearance on the left side of
the device. The device 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 device.
Before removing the fan and heat sink assembly:
1. Shut down the device. If you are unsure whether the device is off or in Hibernation, turn the
device on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the device.
3. Disconnect the power from the device by first disconnecting the power cord from the AC outlet
and then disconnecting the AC adapter from the device.
4. Remove the battery (see
Battery on page 38).
5. If your device has WWAN capability, remove the SIM (see
SIM on page 39).
6. Remove the following components:
a. Keyboard (see
Keyboard on page 43)
b. Hard drive (see
Mass storage devices on page 50)
c. Top cover (see
Top cover on page 56)
d. WLAN module (see
WLAN module on page 53)
e. Display assembly (see
Display assembly on page 65)
f. System board (see
System board on page 74)
Remove the fan and heat sink assembly:
1. Turn the system board upside down.
76 Chapter 4 Removal and replacement procedures
