HP ProBook 4545s HP ProBook 4545s Notebook PC - Maintenance and Service Guide - Page 59

Heat sink, Remove the discrete heat sink

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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 discrete graphics Heat sink for use in computers with UMA graphics Spare part number 654310-001 654311-001 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 Battery on page 34). 5. Remove the following components: a. Bottom door (see Bottom door on page 35). b. Metal heat shield (see Metal heat shield on page 48). c. Fan (see Fan on page 50). Remove the discrete heat sink: 1. Position the computer upside down with battery bay away from you. 2. To remove the discrete heat sink, loosen the six captive Phillips screws (1) in the order indicated on the components, that secure the heat sink to the system board. Component replacement procedures 51

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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
Spare part number
Heat sink for use in computers with discrete graphics
654310-001
Heat sink for use in computers with UMA graphics
654311-001
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
Battery
on page
34
).
5.
Remove the following components:
a.
Bottom door (see
Bottom door
on page
35
).
b.
Metal heat shield (see
Metal heat shield
on page
48
).
c.
Fan (see
Fan
on page
50
).
Remove the discrete heat sink:
1.
Position the computer upside down with battery bay away from you.
2.
To remove the discrete heat sink, loosen the six captive Phillips screws
(1)
in the order indicated
on the components, that secure the heat sink to the system board.
Component replacement procedures
51