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Heat sink
Description Spare part number
Heat sink for use with computer models with a graphics subsystem with discrete graphics 727480-001
Heat sink for use with computer models with a graphics subsystem with UMA graphics 728132-001
NOTE: To properly ventilate the computer, allow at least 7.6 cm (3 in) of 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, 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 service cover (see
Service cover on page 37).
5. Remove the battery (see
Battery on page 39),
6. Remove the fan (see
Fan on page 55).
7. Remove the card reader board (see
Card reader board on page 54).
8. Remove the system board (see
System board on page 57).
Remove the heat sink:
1. Remove the 4 broadhead Phillips PM2.5×2.5 screws securing the heat sink (1) to the system
board.
CAUTION: These screws must be removed in the sequence that is marked on the heat sink so
that the correct pressure is applied to the processor and other components.
62 Chapter 4 Removal and replacement procedures