In order to remove the front panel assembly, the ribbon cable needs to slide out between the case and the LCD. You'll need to move the LCD to make some room.

Be very careful when moving the LCD, and do not attempt to remove it from the iPad—its cable will remain connected while it is rotated over.

Lift the LCD from its long edge farthest from the digitizer cable and gently flip it toward the rear case—like closing a book.

While holding the LCD up, gently slide the front panel away from the iPad. Be careful not to snag the digitizer cable on the rear case or LCD.

Set the LCD back into the body for safekeeping.