Inspiron 7490 Service Manual

Installing the system board

About this task

The following image indicates the connectors on your system board.

1. Display cable
2. Touchscreen cable (available only in touchscreen computers)
3. Coin-cell battery cable
4. Keyboard-backlit cable
5. Keyboard cable
6. Fingerprint-reader cable
7. Battery cable
8. Touchpad cable
9. I/O-board cable

The following image indicates the location of system board and provides a visual representation of the installation procedure.

1. Connect the I/O-board data cable to the connector on the system board.
   NOTE When replacing the system board, technician must remember to connect the I/O-board cable to the I/O connector that is located under the system board; Failing to do so, will result in additional repair time of replacing the system board again. Turn the system board over to access the I/O connector that is located under the system board
2. Slide the ports on the system board into the slots on the palm-rest assembly and align the screw holes on the system board with the screw holes on the keyboard assembly.
3. Connect the keyboard-backlit cable to the system board and close the latch to secure the cable.
4. Connect the keyboard cable to the system board and close the latch to secure the cable.
5. Connect the touchpad cable to the system board and close the latch to secure the cable.
6. Connect the fingerprint-reader cable to the system board and close the latch to secure the cable.
7. Connect the I/O-board cable to the system board and close the latch to secure the cable.
8. Adhere the tape that secures the I/O-board cable to the system board.
9. Connect the coin-cell battery cable to the system board.
10. Connect the P-sensor cable from the system board.
    NOTE Applicable on computers shipped with WWAN card.
11. Replace the screw (M2x3) that secures the system board to the palm-rest assembly.
12. Replace the screw (M2x3) that secures the solid-state drive extension bracket to the system board and palm-rest assembly.
13. Slide the display cable on to the connector on the system board.
14. Slide the touchscreen cable on to the connector on the system board.
    NOTE Applicable only on computers with touchscreen configuration.
15. Replace the three screws (M2x3.5) that secure the display-cable bracket to the system board.
16. Replace the screw (M2x3.5) that secures the USB Type-C port bracket to the system board.
17. Route the WLAN antenna cables along the routing guides and adhere the tapes that secure the WLAN antenna cables to the system board.
18. Connect the WLAN antenna cables to the WLAN card.
19. Align and place the WLAN card bracket on the WLAN card.
20. Replace the screw (M1.6x2.5) to secure the WLAN card bracket to the WLAN card.