HP ProBook 440 G3 Notebook PC - Maintenance and Service Guide

Heat sink assembly
All heat sink assembly spare part kits include replacement thermal material.
Description Spare part number
Heat sink for use in models with discrete graphics 826404-001
Heat sink for use in models with UMA graphics 829012-001
Before removing the heat sink assembly, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is o 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 rst 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 33).
5. Remove the following components:
a. Service door (see Service door on page 34).
b. Hard drive (see Hard drive on page 35)
c. WLAN module (see WLAN/Bluetooth combo card on page 39)
d. Keyboard (see Keyboard on page 42)
e. Top cover (see Top cover on page 47)
f. System board (see System board on page 60)
Remove the heat sink assembly:
1. Position the system board upside-down.
2. Models are available with either UMA or discrete graphics. The heat sink on discrete models includes 2
additional screws. Refer to the following steps that match your model:
Discrete models:
a. To remove the discrete heat sink assembly, in the order indicated on the heat sink, loosen the 6
captive Phillips screws (1)–(6) that secure the heat sink to the system board.
66 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts