Latitude 5540 Owner's Manual

Removing the system board

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

Follow the procedure in Before working inside your computer.
Remove the SIM card.
Remove the base cover.
Remove the 4G WWAN card or 5G WWAN card, as applicable.
Remove the WLAN card.
Remove the memory modules.
Remove the M.2 2230 or M.2 2280 solid-state drive from Slot 1, as applicable.
Remove the M.2 2230 solid-state drive from Slot 2, if applicable.
Remove the heat sink (discrete GPU) or heat sink (integrated GPU), as applicable.
Remove the battery.
Remove the assembly-inner frame.

The following images indicate the system board connectors.

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

Remove the two screws (M2x3) that secure the display-cable bracket to the palm-rest assembly..
Lift the display-cable bracket off the palm-rest assembly.
Remove the three screws (M2x4) that secure the Type-C bracket to the palm-rest assembly..
Lift the Type-C bracket off the palm-rest assembly.
Lift up the black flap near the antenna cables and uncover the sensor board-cable.
Disconnect the sensor board-cable from the connector on the system board.
Disconnect the display cable from the connector on the system board.
Remove the display cable from the routing guides on the system board.
Disconnect the fan cable from the connector on the system board.
Open the latch and disconnect the touchpad cable from the connector on the system board.
Open the latch and disconnect the USH cable from the USH module.
Disconnect the coin-cell battery cable from the connector on the system board.
Remove the three screws (M2x3) that secure the system board to the palm-rest assembly.
Lift the system board off the palm-rest assembly.