When you replace the system board, be sure to remove the following components from the defective system
board and install them on the replacement system board:
● WWAN module (see WWAN module on page 44).
● WLAN module (see WLAN module on page 46).
● Solid-state drive (see Solid-state drive on page 48).
● Heat sink (see Heat sink on page 61).
● RTC battery (see RTC battery on page 64).
Remove the system board:
1. Carefully disconnect the WWAN module antenna cables (1) from the WWAN module.
NOTE: Computer models have one to four WWAN module antenna cables. The antenna cables have tags
that identify them with a number that corresponds to a terminal on the WWAN module. Connect the
antenna cable to the corresponding WWAN module terminal.
2. Disconnect the webcam cable (2) from the system board.
3. Release the ZIF connector (3) to which the connector board cable is connected, and then disconnect the
connector board cable from the system board.
4. Release the WWAN module antenna cables from the retention clips (4) that are built into the computer.
5. Disconnect the display panel cable (5) from the system board.
6. Carefully disconnect the WLAN module antenna cables (6) from the WLAN module.
NOTE: Computer models have either one or two WLAN module antenna cables. On models with two
antennas, the #1 white WLAN module antenna cable connects to the WLAN module #1 Main terminal. The
#2 black WLAN module antenna cable connects to the WLAN module #1 Aux terminal.
7. Release the display panel cable and the WLAN module antenna cables from the retention clips (7) that are
built into the computer.
8. Disconnect the following cables from the system board:
● Speaker cables (8)
● Keyboard ZIF cable (9)
● Card reader ZIF cable (10)
● Touchpad ZIF cable (11)
● Backlight ZIF cable (12)
● NFC module ZIF cable (13)
● RTC battery cable (14)
● Fingerprint reader ZIF cable (15)
System board
59
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