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 65)

●WLAN module (see WLAN module on page 76)

●WWAN module (see WWAN module on page 70)

●Modem module (see Modem module on page 97)

●Processor (see Processor on page 104)

Remove the system board:

1.Position the computer right-side up with the front toward you.

2.Disconnect the following cables from the system board:

●(1) Bluetooth module cable

●(2) USB connector module cable

●(3) RJ-45 cable

●(4) SIM board cable

●(5) Power cable

3.Lift the rear edge of the system board (1) until it rests at an angle.

Component replacement procedures 107