You will finds a ribbon cable connecting the motherboard to the control interface circuit board.

Using a spudger or plastic opening tool, lift flap on the ribbon cable ZIF connector.

Using a plastic pry tool or fine tip plastic tool to open the clamp.

Using the tool, try lifting the clamp up on either location, noted by the blue arrow.

The ribbon should pop out, if not you should be able to slide it out from the clamp.