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 battery (see Battery on page 34).
5. Remove the optical drive (see Optical drive on page 35).
6. Remove the bottom cover (see Bottom cover on page 38).
To remove the heat sink assembly:
1. Position the system board upside down.
2. If you have a model with discrete graphics and a non-Skylake processor, in the order indicated, remove
the four Phillips PM2.0×3.0 screws (1) – (4) and the two Phillips PM2.5×4.0 screws (5) – (6) that secure
the heat sink to the system board.
3. Remove the heat sink (7) from the system board.
4. If you have a model with discrete graphics and a Skylake processor, in the order indicated, remove the
seven Phillips PM2.0×3.0 screws (1) that secure the heat sink to the system board.
50 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts
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