Heat Sink - HP ProBook 4435s Maintenance And Service Manual

Reverse this procedure to install the fan.
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

All heat sink spare part kits include replacement thermal material.
Description
Heat sink for use in computers with UMA graphics
Heat sink for use in computers with discrete graphics
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
5. Remove the bottom door (see
6. Remove the fan (see
Remove the heat sink:
1. Position the computer upside-down with the front toward you.
2. To remove the discrete heat sink, in the order indicated, loosen the six captive Phillips screws
(1) — (6) that secure the heat sink to the system board.
Battery on page 40).
Bottom door on page
Fan on page 56).
41).
Component replacement procedures
Spare part number
654491-001
654492-001
57