HP ProBook 4446s HP ProBook 4445s Notebook PC HP ProBook 4446s Notebook PC - M - Page 72

Heat sink

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Reverse this procedure to install the system board and the battery connector. 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 Spare part number 683784-001 683783-001 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 following components: a. Battery (see Battery on page 33) b. Bottom door (see Bottom door on page 34). c. Hard drive (see Hard drive on page 38) d. Optical drive (see Optical drive on page 35) e. Memory (see Memory modules on page 40) f. WLAN module (see WLAN/Bluetooth combo card on page 42) g. Keyboard (see Keyboard on page 44) h. Metal heat shield (see Metal heat shield on page 46) i. Fan (see Fan on page 47) j. Top cover (see Top cover on page 48) k. System board (see System board on page 61) Remove the discrete heat sink: 1. Position the system board face up with the front toward you. 2. To remove the discrete heat sink, in the order indicated on the heat sink, loosen the six captive Phillips screws (1) that secure the heat sink to the system board. 64 Chapter 4 Removal and replacement procedures

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Reverse this procedure to install the system board and the battery connector.
Heat sink
All heat sink spare part kits include replacement thermal material.
Description
Spare part number
Heat sink for use in computers with UMA graphics
683784-001
Heat sink for use in computers with discrete graphics
683783-001
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 following components:
a.
Battery (see
Battery
on page
33
)
b.
Bottom door (see
Bottom door
on page
34
).
c.
Hard drive (see
Hard drive
on page
38
)
d.
Optical drive (see
Optical drive
on page
35
)
e.
Memory (see
Memory modules
on page
40
)
f.
WLAN module (see
WLAN/Bluetooth combo card
on page
42
)
g.
Keyboard (see
Keyboard
on page
44
)
h.
Metal heat shield (see
Metal heat shield
on page
46
)
i.
Fan (see
Fan
on page
47
)
j.
Top cover (see
Top cover
on page
48
)
k.
System board (see
System board
on page
61
)
Remove the discrete heat sink:
1.
Position the system board face up with the front toward you.
2.
To remove the discrete heat sink, in the order indicated on the heat sink, loosen the six captive
Phillips screws
(1)
that secure the heat sink to the system board.
64
Chapter 4
Removal and replacement procedures