Figure 56. Removing the I/O board
Steps
1. Unroute the WWAN antenna cables from the routing guides on the I/O daughter board and move it away from the I/O
board.
2. Remove the screw (M2x3) that secures the the fingerprint reader bracket in place and remove the fingerprint reader
bracket.
3. Peel the USH daughter board flexible flat cable from the I/O daughter board.
NOTE: This step applies to models shipped with a USH daughter board.
4. Disconnect the fingerprint reader flexible flat cable (for models shipped with a fingerprint reader), Darwin cable, fan cable,
touchpad flexible flat cable, and speakers cable from the I/O board.
5. Remove the six screws (M1.2x1.4) that secure the I/O daughter board in place.
6. Lift the I/O daughter board away from the computer.
NOTE:
While replacing the I/O daughter board, the WWAN card thermal pad mylar sticker at the top side of the I/O
daughter board must be replaced to the replacement I/O daughter board.
106 Removing and installing Field Replaceable Units (FRUs)
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