HP ProBook 450 G2 Maintenance And Service Manual page 105

b. Lift the heat sink from the system board (2).
NOTE: For discrete models, thoroughly clean thermal material from the surfaces of the system
board components (1)(3) and the heat sink (2)(4) each time you remove the heat sink. All heat sink
and processor spare part kits include thermal material.
UMA models:
a. To remove the UMA heat sink assembly, in the order indicated on the heat sink, loosen the 4
captive Phillips screws (1) that secure the heat sink to the system board.
Component replacement procedures 93