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Latitude 5420 Service Manual

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Installing the system board

Prerequisites

If you are replacing a component, remove the existing component before performing the installation procedure.

About this task

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

System board

System board

Steps

NOTE:The system board can be removed and installed with the thermal module attached in order to simplify the procedure and preserve the thermal bond between the system board and heat-sink. In order to do so, technicians must also remove the two (M2x5) screws the secure the system fan to the system board.

  1. Slide the system board to make the USB Type-C connector to toe-in to the hinge saddle and align the screw holes on the system board with the screw holes on the palm-rest assembly and keyboard assembly.
  2. Replace the four screws (M2x3) to secure the system board to the palm-rest assembly and keyboard assembly.
  3. Align and place the USB Type-C bracket on the system board.
  4. Replace the three screws (M2x5) that secure the USB Type-C bracket to the system board.
  5. Connect the USH board cable to the system board and close the latch to secure the cable to the system board.
  6. Connect the touch pad cable to the system board and close the latch to secure the cable to the system board.
  7. Route the coin-cell battery cable under the system board and connect the coin-cell battery cable to the connector on the system board.
  8. Route the display and eDP/display cable through the routing guide on the system board.
  9. Connect the eDP/display cable to the connector on the system board.
  10. Connect the display cable to the connector on the system board.
  11. Adhere the tape that secures the display cable to the system board.
  12. Align the screw holes on the eDP/display cable bracket with the screw holes on the system board.
  13. Replace the two screws (M2x3) that secure the eDP/display cable bracket to the system board.

Next steps

  1. Install the assembly inner frame.
  2. Install the battery.
  3. Install the solid-state drive.
  4. Install the heat sink.
  5. Install the memory module.
  6. Install the WWAN card.
  7. Install the WLAN card.
  8. Install the base cover.
  9. Install the microSD card.
  10. Install the SIM card.
  11. Follow the procedure in After working inside your computer.

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