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Heat sink
All heat sink spare part kits include replacement thermal material.
Description Spare part number
For use in 4540s models:
Heat sink for use in models with UMA graphics 683489-001
Heat sink for use in models with discrete graphics 683490-001
For use in 4440s/4441s models:
Heat sink for use in models with discrete graphics 683655-001
Heat sink for use in models with UMA graphics 683656-001
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 42).
5. Remove the following components:
a. Bottom door (see
Bottom door on page 44).
b. Keyboard (see
Keyboard on page 56)
c. Heat shield (see
Heat shield on page 59)
d. Fan (see
Fan on page 61)
Remove the heat sink:
1. Position the computer upside-down.
2. To remove the discrete heat sink, in the order indicated, loosen the six captive Phillips screws
(1) that secure the heat sink to the system board.
Component replacement procedures 63