Dell Latitude 3390 2-in-1 Owner's Manual page 13

c Release the volume control board cable from the routing clips .
d Remove the screw that secures the power and volume control board to the laptop [3].
e Lift the power and volume control board away from the laptop [4].
Installing the power and volume control board
1 Place the power and volume control board on the laptop chassis.
NOTE: Place the power and volume control board into the two plastic placeholders which secures the board to the system
chassis.
2 Tighten the screw to secure the power and volume control board to the laptop.
3 Route the cables through the cable routing clips.
4 Connect the power and volume control board to the connector on the system board.
5 Affix the adhesive tape to secure it.
6 Install the:
a coin cell battery
b battery
c base cover
7 Follow the procedure in After working inside your computer.
Removing and installing components 13