System board

Reverse this procedure to install the microphone.

Description	Spare part number

System board (includes replacement thermal material)	453992-001

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.

4. Remove the battery (see Battery on page 37).

5. Remove the following components:

a. Hard drive (see Hard drive on page 41)

b. Optical drive (see Optical drive on page 48)

c. Keyboard (see Keyboard on page 50)

d. Switch cover (see Switch cover on page 52)

e. Display assembly (see Display assembly on page 54)

f. Top cover (see Top cover on page 59)

g. Bluetooth module (see Bluetooth module on page 65)

When replacing the system board, be sure that the following components are removed from the defective system board and installed on the replacement system board:

●Memory module (see Memory module on page 43)

●WLAN module (see WLAN module on page 45)

●ExpressCard assembly (see ExpressCard assembly on page 71)

●Modem module (see Modem module on page 73)

●Fan (see Fan on page 75)

●Heat sink (see Heat sink on page 77)

●Processor (see Processor on page 79)

Remove the system board:

1. Remove the three Phillips PM2.5×6.0 screws (1) that secure the system board to the base enclosure.

Component replacement procedures 69

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