The circuit board processes all the information the phone uses. Removing the circuit board allows access to several underlying components.
Locate the small button on the top of the phone.
Depress the button.
With your other hand, pull the front cover away from the phone.
Remove all six 5.3 mm long T6 screws.
Remove the circuit board/faceplate sub-assembly from the back of the phone.
Using your fingers, pull the small plastic tab away from the circuit board/faceplate sub-assembly.
Rotate the faceplate away from the circuit board.
Gently remove the faceplate from the circuit board, taking care to not break the small plastic tab on the other side of the sub-assembly.