Maintenance and Service Guide

Heat sink assembly
NOTE: The heat sink assembly spare part kit includes replacement thermal materials.
Description Spare part number
Heat sink assembly, discrete, (includes replacement thermal materials) L23192-001
Heat sink assembly, UMA (includes replacement thermal materials) L23191-001
Heat sink assembly, for fanless systems (includes replacement thermal materials) L23190-001
Before removing the heat sink assembly, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is o 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 rst unplugging the power cord from the AC outlet and then
unplugging the AC adapter from the computer.
4. Remove the rubber feet (see Computer feet on page 31).
5. Remove the bottom cover (see Bottom cover on page 33).
6. Remove the battery (see Battery on page 35).
To remove the heat sink assembly:
1. If you have a model with discrete graphics:
a. In the order indicated on the heat sink, remove the six Phillips M2.0×4.0 screws (1) that secure the
heat sink to the system board.
52 Chapter 5 Removal and replacement procedures for Authorized Service Provider parts