3. Remove the three Phillips PM2.5×7.0 screws (2) that secure the board to the computer, and
then slide the board away from the side and lift it out of the computer (3).
Reverse this procedure to install the function board.
System board
NOTE: All system board spare part kits include thermal pads.
Description Spare part number
System board for use in models with WWAN 658143-001
System board for use in models without WWAN 665718-001
Before removing the system board, 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.
Component replacement procedures 83
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