Dell XPS 12 (9Q33, Mid 2013) - Manual (Page 30)

Replacing the Heat Sink
WARNING: Before working inside your computer, read the safety information
that shipped with your computer and follow the steps in "Before Working Inside
Your Computer" on page 7. After working inside your computer, follow the
instructions in "After Working Inside Your Computer" on page 9.
For more safety best practices, see the Regulatory Compliance home page at
dell.com/regulatory_compliance.
Procedure
NOTE: The original thermal grease can be reused, if the original system board
and heat sink are reinstalled together. If either the system board or the heat sink
is replaced, use the thermal pad provided in the kit to make sure that thermal
conductivity is achieved.
1 Align the screws on the heat sink with the screw holes on the system board.
2 In sequential order (indicated on the heat sink), tighten the captive screws that
secure the heat sink to the system board.
Postrequisites
1 Replace the battery. See "Replacing the Battery" on page 14.
2 Replace the base cover. See "Replacing the Base Cover" on page 12.
30 | Replacing the Heat Sink