NOTE: To properly ventilate the computer, allow at least a 7.6-cm (3-in) 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.

Heat sink

NOTE: All heat sink spare part kits include replacement thermal material.

Description

Spare part number

 

 

Heat sink for use in computers with UMA graphics

642766-001

 

 

Heat sink for use in computers with discrete graphics

642767-001

 

 

Before removing the heat sink, 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 63).

5.Remove the bottom door (see Bottom door on page 70).

6.Remove the fan (see Fan on page 90).

Remove the heat sink:

1.Position the computer upside-down with the front toward you.

2.In the order indicated on the heat sink, loosen the captive Phillips screws (1) that secure the heat sink to the system board. The discrete heat sink has six screws, while the UMA heat sink has four screws. Both heat sinks are illustrated below.

3.Lift the right side of the heat sink up at an angle (2).

Component replacement procedures 91

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HP 8460p LJ541UT 14.0 LJ541UT#ABA, PB 6460B LQ177AW#ABA, QS020US, QX760US manual Heat sink, Description Spare part number