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Latitude 5520 Service Manual

PDF

Removing the system board

Prerequisites

  1. Follow the procedure in Before working inside your computer.
  2. Remove the SIM card.
  3. Remove the microSD card.
  4. Remove the base cover.
  5. Remove the solid-state drive.
    NOTE: To remove the thermal pad on mylar which is available only in systems with Intel Pyramid Glacier SSD configuration follow the below steps.
    SSD
    1. Remove the single screw (M2x4) that secures the M.2 2280 solid-state drive to the system board.
    2. Slide and remove the M.2 2280 solid-state drive from the solid-state drive slot on the system board.
    3. Peel and remove the thermal pad mylar sticker.
  6. Remove the memory module.
  7. Remove the WLAN card.
  8. Remove the WWAN card.
  9. Remove the heat sink.
  10. Remove the battery.
  11. Remove the system fan.
  12. Remove the assembly inner frame.

About this task

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

system board

system board

Steps

NOTE: The system board can be removed and installed along with the thermal module attached, to preserve the thermal bond between the system board and heat-sink. In order to do so, technicians must remove the two M2x5 screws securing the system fan to the palm-rest assembly.

  1. Disconnect the fingerprint cable from the connector on the system board.
  2. Peel the adhesive tape and disconnect the sensor-board cable from the connector on the system board.
  3. Remove the three screws (M2x4) that secure the USB Type-C bracket to the system board.
  4. Remove the two screws (M2x3) that secure the eDP cable bracket to the system board.
  5. Lift the eDP cable bracket away from the system.
  6. Peel the tape that secures the display cable to the system board.
  7. Using the pull tab, disconnect the display cable from the connector on the system board.
  8. Disconnect the eDP cable from the connector on the system board and unroute it from the routing guide.
  9. Open the latch and disconnect the USH board cable from the system board.
  10. Open the latch and disconnect the LED board cable from the system board.
  11. Open the latch and disconnect the clickpad cable from the system board.
  12. Pry the coin-cell battery off the palm-rest assembly and remove it from the routing guides on the palm-rest assembly.
  13. Remove the three screws (M2x3) that secure the system board to the palm-rest assembly and keyboard assembly.
  14. Lift the system board off the palm-rest assembly and keyboard assembly.
  15. Flip the system board and disconnect the coin-cell battery cable from the connector on the system board.

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