Power-Button Board; Removing The Power-Button Board - Dell Latitude 5521 Service Manual

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 three (M2x3) screws to secure the system board to the palm-rest assembly and keyboard assembly.
3. Connect the fingerprint reader to the connector on the system board.
4. Connect the sensor cable to the connector on the system board and adhere the Mylar tape over it.
5. Align and place the USB Type-C bracket on the system board.
6. Replace the three (M2x5) screws that secure the USB Type-C bracket to the system board.
7. Route the display and eDP/display cable through the routing guide on the system board.
8. Connect the eDP/display cable to the connector on the system board.
9. Connect the display cable to the connector on the system board.
10. Adhere the tape that secures the display cable to the system board.
11. Align the screw holes on the eDP/display cable bracket with the screw holes on the system board.
12. Replace the two (M2x3) screws that secure the eDP/display cable bracket to the system board.
13. Connect the touchscreen cable from the connector on the system board (for models shipped with a touchscreen).
14. Connect IR camera cable from the connector on the system board (for models shipped with an IR camera).
15. Route the coin-cell battery cable under the system board and connect the coin-cell battery cable to the connector on the
system board.
16. Connect the touch pad cable to the system board and close the latch to secure the cable to the system board.
17. Connect the USH board cable to the system board and close the latch to secure the cable to the system board.
Next steps
1. Install the assembly inner
2. Install the heat sink -
3. Install the battery.
4. Install the WWAN card.
5. Install the WLAN card.
6. Install the 2280 solid-state drive
7. Install the memory module.
8. Install the base cover.
9. Install the microSD card.
10. Install the SIM card.
11. Exit Service Mode.
12. Follow the procedure in

Power-button board

Removing the power-button board

Prerequisites
1. Follow the procedure in
2. Enter service mode.
3. Remove the SIM card.
4. Remove the microSD
5. Remove the base cover.
6. Remove the 2280 solid-state drive
7. Remove the WLAN card.
8. Remove the WWAN card.
frame.
UMA or discrete based on the system configuration.
or 2230 solid-state
After working inside your
Before working inside your
card.
or 2230 solid-state
drive.
computer.
computer.
drive.
Removing and installing components 59