Dell Inspiron 5557 Service Manual page 38

4 Lift the latches and disconnect the keyboard and keyboard-backlight
cables from the system board.
NOTE: The keyboard-backlight cable is present only if the laptop is
shipped with a backlit keyboard.
1 keyboard cable
3 keyboard-backlight cable
5 Lift the keyboard, along with the cables, off the palm-rest assembly.
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2 latch