Power off the controller
Remove the batteries or battery pack
Peel off any side grips or stickers if present
Remove the screws from the back shell
Use a plastic pry tool to separate the front and back shells
Lift off the back shell carefully
Disconnect the battery connector if attached
Remove the face buttons and D-pad
Remove the thumbsticks
Remove the bumper and trigger assemblies
Unscrew and remove the internal board
Disconnect any ribbon cables or connectors
Remove the vibration motors if needed
Keep all screws and parts organized
Reassemble in reverse order