d.Fan (see Fan on page 64)

e.Heat sink (see Heat sink on page 65)

f.Keyboard (see Keyboard on page 68)

g.Bottom cover (see Bottom cover from top cover on page 71)

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:

●SIM (see SIM on page 43)

●Memory module (see Memory modules on page 56)

●WLAN module (see WLAN module on page 60)

●WWAN module (see WWAN module on page 58)

●Modem module (see Modem module on page 63)

●Processor (see Processor on page 67)

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 (as necessary):

●(1): Antenna cables from the rubber clamp

●(2): Lid sensor board cable

●(3): Display cable

●(4): Webcam cable

●(5): Fingerprint reader cable

●(6): RTC battery cable

Component replacement procedures 91