Latitude 5440 Owner's Manual

Removing the system board

About this task

The following images indicate the system board connectors.

1. Fingerprint-reader cable connector
2. Display cable connector
3. WWAN card slot
4. Camera/IR cable connector
5. Solid-state drive slot
6. Wireless card slot
7. Memory modules
8. Touchpad cable connector
9. USH cable connector

The following images indicate the location of the system board and provide a visual representation of the removal procedure.

1. Remove the screw (M2x3) that secures the WWAN card support frame to the palm-rest assembly.
2. Lift the WWAN card support frame off the palm-rest assembly.
3. Remove the screw (M2x3) that secures the fingerprint reader bracket to the palm-rest assembly.
4. Lift the fingerprint reader bracket off the palm-rest assembly.
5. Remove the two screws (M2x3) that secures the display cable bracket to the palm-rest assembly.
6. Lift the display cable bracket off the palm-rest assembly.
7. Open the latch and disconnect the USH cable from the USH module.
8. Open the latch and disconnect the touchpad cable from the touchpad module.
9. Remove the three screws (M2x5) that secure the USB Type-C bracket to the palm-rest assembly.
10. Remove the three screws (M2x4) that secure the system board to the palm-rest assembly.
    NOTE:Ensure that the SIM card tray is removed before lifting the system board.
11. Lift the left side of the system board at an angle and slide it out off the palm-rest assembly.
    NOTE: For computers shipped with a 4G WWAN card, the WWAN card support frame MUST be transferred to the replacement system board.

    NOTE:For models shipped with a 5G WWAN card, the WWAN card thermal pad MUST be transferred to the replacement system board.

    NOTE: The system board includes a USB Type-C bracket which must NOT be removed.

    NOTE:

    For models shipped with a U15 system board, the system board includes two power shielding covers which must NOT be removed.