HP EliteBook 850 G4 Maintenance And Service Manual page 68

2. Discrete graphics models: The thermal material must be thoroughly cleaned from the surfaces of the
heat sink and the system board components each time the heat sink is removed. Replacement thermal
material is included with the heat sink, processor, and system board spare part kits.
3. UMA graphics models: 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:
fragile and can be easily damaged and bent during removal.
56 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts
Take extreme care when removing the heat sink and fan assembly. The heatpipe is very