How To Fix Ps 4 Controller Square Button. If the PS button on your controller isn't working, first make sure that the USB connector is properly inserts inside the USB port and in a good contact. While pushing the clip outward, slowly pull the rear case away from the front case until you feel them separate.
This was not due to sticky buttons needing cleaned.
You'll have to remove the top connection and pc board to get to the lower connection.
Took it back out and the square button wouldn't work. How to turn off and charge the controller. It's really easy for them to become disconnected, especially the bottom end of it.