NOTE:Before disconnecting the cables from the system board, note the location of the connectors so that you can reconnect the cables correctly after you replace the system board.
NOTE:The Service Tag of your computer is stored in the system board. Enter the Service Tag in the BIOS setup program after you replace the system board.
NOTE:Replacing the system board removes any changes that you have made to the BIOS using the BIOS setup program. Make the appropriate changes again after you replace the system board.
NOTE:After your computer is reassembled and turned on, it prompts for the Real Time Clock (RTC) reset. When the RTC reset cycle occurs, the computer restarts several times and then an error message is displayed- "Time of day not set". Enter the BIOS when this error appears and set the date and time on your computer to resume normal functionality.
NOTE:The system board can be removed or installed together with the heat sink attached. This simplifies the procedure and avoids breaking the thermal bond between the system board and the heat sink.
The following image indicates the connectors on your system board.
Figure 1. System-board connectors
Fingerprint reader-board cable
Antenna cables
Keyboard control-board cable
The following images indicate the location of the system board and provide a visual representation of the removal procedure.
Steps
Loosen the three captive screws that secure the camera and display-assembly cable bracket in place.
Lift the camera and display-assembly cable bracket off the system board.
Remove the two screws (M1.6x3) that secure the display-assembly cable holder to the palm-rest and keyboard assembly.
Disconnect the touch screen cable and camera cable.
Remove the screw (M1.6x3) that secures the wireless-card bracket to the system board.
Using a plastic scribe, disconnect the antenna cables from the wireless card. Unthread them from the clips on the system board.
Open the latch, and disconnect the fingerprint reader-board cable from the system board.
Disconnect the speaker cable from the system board.
Remove the screw (M2x4) that secures the right USB Type-C bracket to the palm-rest and keyboard assembly.
Lift the right USB Type-C bracket from the palm-rest and keyboard assembly.
Remove the two screws (M2x4) that secure the left USB Type-C bracket to the palm-rest and keyboard assembly.
Lift the left USB Type-C bracket from the palm-rest and keyboard assembly.
NOTE:Transfer the two USB Type-C brackets to the new replacement system board.
Open the latch, and disconnect the keyboard-control board cable from the system board.
Remove the single screw (M2x3) and the two screws (M2x4) that secure the system board to the palm-rest and keyboard assembly.
NOTE:The thermal plate is a part of the system board, DO NOT separate it from the system board.
Lift the system board off the palm-rest and keyboard assembly.
NOTE:When handling the system board, hold the system board firmly at the top and bottom. DO NOT hold the system board at the thin areas on the sides at the left and right.
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