HP EliteBook 840 G4 Notebook PC HP EliteBook 848 G4 Notebook PC Maintenance and Service Guide

Heat sink/fan assembly
NOTE: The heat sink/fan assembly spare part kit includes replacement thermal material.
Description Spare part number
Heat sink/thermal module 821163-001
Before removing the heat sink/fan assembly, follow these steps:
1. Turn o 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 the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
4. Remove the bottom cover (see Bottom cover on page 32).
5. Remove the battery (see Battery on page 36).
6. Remove the keyboard (see Keyboard on page 47).
7. Remove the internal base plate (see Internal base plate on page 50).
Remove the heat sink/fan assembly:
▲
Loosen the six captive screws on the fan and heat sink following the sequence stamped on the fan and
heat sink (1), disconnect the fan cable from the system board (2), and then remove the heat sink/fan
assembly from the system board (3).
CAUTION: Take extreme care when removing the heat sink and fan assembly. The heatpipe is very
fragile and can be easily damaged and bent during removal.
Component replacement procedures 53