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Latitude 5521 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 memory module.
  6. Remove the 2280 solid-state drive or 2230 solid-state drive.
  7. Remove the WLAN card.
  8. Remove the WWAN card.
  9. Remove the battery.
  10. Remove the heat sink - UMA or discrete based on the system configuration.
  11. Remove the assembly inner frame.

About this task

The following image indicates the connectors on your system board.

Figure 1. System board connectors
system board connectors
  1. Fingerprint reader connector
  2. WLAN connector
  3. IR camera connector
  4. eDP/display cable connector
  5. System fan connector
  6. Clickpad cable connector
  7. Memory modules
  8. Solid-state drive slot 1
  9. Battery cable connector
  10. LED board cable connector
  11. Solid-state drive slot 2
  12. USH board connector
  13. WWAN connector
  14. Hard drive cable cable connector
  15. Speaker cable connector

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

Removing the system boardRemoving the system board

Steps

NOTE: The system board can be removed and installed with the heat sink attached in order to simplify the procedure and preserve the heat sink 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.
NOTE: For the models shipped with a fingerprint reader, disconnect the fingerprint reader cable from the connector on the system board before removing the system board from the palm-rest assembly and keyboard assembly.

  1. Disconnect the fingerprint reader cable from the connector on the system board.
  2. Peel the Mylar tape and disconnect the sensor cable.
  3. Remove the three (M2x4) screws that secure the USB Type-C bracket to the system board.
  4. Lift off the USB Type-C bracket off the system board.
  5. Remove the two (M2x3) screws that secure the eDP/display cable bracket to the system board.
  6. Lift the eDP/display cable bracket away from the system.
  7. Peel the tape that secures the display cable to the system board.
  8. Using the pull tab, disconnect the display cable from the connector on the system board.
  9. Disconnect IR camera cable from the connector on the system board (for models shipped with an IR camera).
  10. Disconnect the touchscreen cable from the connector on the system board (for models shipped with a touchscreen).
  11. Open the latch and disconnect the USH board cable from the connector on the system board.
  12. Open the latch and disconnect the clickpad cable from the connector on the system board.
  13. Open the latch and disconnect the LED board cable from the connector on the system board.
  14. Disconnect the coin-cell battery cable from the connecter on the system board.
    NOTE: When you disconnect the coin-cell battery cable from the connecter on the system board, the CMOS setting is cleared.
  15. Remove the three (M2x3) screws that secure the system board to the palm-rest assembly and keyboard assembly.
  16. Lift the system board off the palm-rest assembly and keyboard assembly.

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