Dell Precision 5520 Owner's Manual page 15

f memory module
g system board
3 Perform the following steps to disconnect the keyboard and backlight connectors from the computer.
a Lift up the connector lock [1] and the disconnect the cables from the connectors [2].
b Peel back the screw shields [3].
4 Un-route the LVDS cable [1] and then remove the 31 M1.6 x 1.5 screws that secure the keyboard to the computer [2].
5 Lift and remove the keyboard from the computer.
Removing and installing components 15