Latitude 7455 Owner's Manual

Installing the system board

About this task

The following image indicates the system-board connectors.

NOTE:The Type-C bracket is bundled with the system board. DO NOT remove the USB Type-C bracket from the system board.

NOTE:The replacement system board is shipped with the coin-cell battery attached.

1. Fan cable connector (JFAN1)
2. Camera-cable connector (MIPI)
3. Display-cable connector (EDP)
4. Solid state drive slot (SSD)
5. Left speaker-cable connector (JSPK1)
6. Battery-cable connector (JBATT1)
7. Keyboard-backlight cable connector (JKBBL1)
8. Keyboard-cable connector (JKB1)
9. Touchpad-cable connector (JTP1)
10. Right speaker-cable connector (JSPK2)
11. I/O-board cable connector (JIO1)
12. WLAN module
13. Coin-cell cable connector (JRTC1)
    NOTE:The replacement system board is shipped with the coin-cell battery attached.
14. I/O board FPC-cable connector (JWWAN1)

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

1. Align the screw holes of the system board with the screw holes on the palm-rest and keyboard assembly.
2. Replace the two screws (M2x2.5) that secure the USB Type-C bracket to the palm-rest and keyboard assembly.
3. Adhere the coin-cell battery to the WWAN I/O board FPC cable (for computers that are shipped with WWAN support).
4. Connect the left speaker-cable to the connector (JSPK1) on the system board and close the latch to secure the cable.
5. Connect the keyboard backlight-cable to the connector (JKBBL1) on the system board and close the latch to secure the cable.
6. Connect the keyboard cable to the connector (JKB1) on the system board and close the latch to secure the cable.
7. Connect the touchpad cable to the connector (JTP1) on the system board and close the latch to secure the cable.
8. Connect the right speaker-cable to the connector (JSPK2) on the system board.
9. Connect the I/O board FPC cable (MB) from the connector (JWWAN1) on the system board and close the latch to secure the cable.
10. Connect the WLAN antenna cables to the connectors on the WLAN module.

    The following table provides the antenna-cable color scheme for the WLAN module on your computer.

    Table 1. Antenna-cable color schemeThe following table provides the antenna-cable color scheme for the WLAN module on your computer.

    Connectors on the wireless card	Antenna-cable color	Silkscreen marking
    Main	White	W	▲ (solid triangle)
    Auxiliary	Black	B	△ (outlined triangle)

11. Place the WLAN-thermal shield on the WLAN-antenna module and slide the shield to the right.
12. Align the screw hole on the WLAN-thermal shield with the screw hole on the palm-rest and keyboard assembly.
13. Replace the screw (M2x2.5) that secures the WLAN-thermal shield to the palm-rest and keyboard assembly.