Dell Latitude 3390 2-in-1 Owner's Manual page 19

c LED board
3 To remove speakers:
a Remove the mylar tape that secures the speaker cable on the system board [1].
NOTE: Lift the latch and release the LED board cable from the laptop, before un-routing the speaker cable.
b Disconnect the speaker cable from the connector on the system board [2].
c Release the speaker cables from the routing clips on the system board [3].
d Lift the speakers away from the laptop.
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Removing and installing components 19