Dell Latitude 7390 2-in-1 Owner's Manual page 28

5 To release the cables:
a Flip the coin cell battery to reveal the speaker cable [1].
b Disconnect the speaker cable from the system board [2].
c Disconnect the power board cable from the system board [3].
6 Peel the tapes that secure antenna cables and remove the cables from the routing clips.
28 Removing and installing components