Dell Inspiron 15 Owner's Manual page 34

NOTE: Keyboard-backlight cable is present only on a backlit-keyboard.
1 Place the keyboard on a flat and clean surface.
1 keyboard cable
3 keyboard
CAUTION: Do not apply excess pressure while folding the cables.
2 Lift the keyboard cable and gently fold the keyboard-backlight cable at
the fold line.
1 keyboard cable
3 fold line
34
2 keyboard-backlight cable
2 keyboard-backlight cable