Latitude 7455 Owner's Manual

PDF

Removing the system board

CAUTION:The information in this removal section is intended for authorized service technicians only.

Prerequisites

  1. Follow the procedure in Before working inside your computer.
  2. Remove the base cover.
  3. Remove the SSD.
  4. Remove the WWAN card (for computers that are shipped with WWAN support).
  5. Remove the fan with WLAN-only support or fan with WWAN support, whichever is applicable.
  6. Remove the heat sink.
  7. Remove the display assembly with WLAN-only support or display assembly with WWAN support, whichever is applicable.

About this task

The following image indicates the system-board connectors.
NOTE:The USB Type-C bracket is bundled with the system board. DO NOT remove the USB Type-C bracket from the system board.
Figure 1. System-board connectors
Image: System-board connectors
  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. Wireless card (WLAN)
  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.
Figure 2. Removing the system board
Image: Removing the system board
Figure 3. Removing the system board
Image: Removing the system board

Steps

  1. Remove the screw (M2x2.5) that secures the WLAN thermal shield to the palm-rest and keyboard assembly.
  2. Slide the WLAN thermal shield to the left and lift the shield off the palm-rest and keyboard assembly.
  3. Disconnect the WLAN antenna cables from the connectors (B and W) on the WLAN module.
  4. Disconnect the I/O board cable from the connector (JIO1) on the system board.
  5. For computers that are shipped with WWAN support, open the latch and disconnect the WWAN I/O-board FPC cable (JWWAN1) from the connector (WWAN) on the system board.
  6. Disconnect the right speaker-cable from the connector (JSPK2) on the system board.
  7. Open the latch and disconnect the touchpad cable from the connector (JTP1) on the system board.
  8. Open the latch and disconnect the keyboard cable from the connector (JKB1) on the system board.
  9. Open the latch and disconnect the keyboard backlight-cable from the connector (JKBBL1) on the system board.
  10. Disconnect the left speaker-cable from the connector (JSPK1) on the system board.
  11. Peel off the coin-cell battery from the WWAN I/O board FPC cable (for computers that are shipped with WWAN support).
    NOTE:Keep the coin-cell battery connected to the system board.
  12. Remove the two screws (M1.6x1.8) that secure the system board to the palm-rest and keyboard assembly.
  13. Lift the system board off the palm-rest and keyboard assembly.
    NOTE:The USB Type-C bracket is bundled with the system board. DO NOT remove the USB Type-C bracket from the system board.
    Figure 4. USB Type-C bracket
    Image: USB Type-C bracket
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