Using a Phillips #00 precision screwdriver, remove the seven 4mm screws (5 on the bottom of the device and 1 on each of the two sides) holding the back panel to the camera.
On the NX300M model, there is an additional screw under the text AMOLED behind display which should be removed before detaching the back panel of the camera.
Place a plastic opening tool into the gap between the back panel and camera body, from both the top and the bottom of camera. Carefully pry open the camera and separate the back panel.
Using a Phillips #00 precision screwdriver, remove the 3mm screw holding the top panel of the camera in place. Also, remove the screws under hot shoe metal clip, otherwise you can break a piece of sensor frame leading to costly repair.
Thanks, this was useful. Camera was switching modes randomly. I didn't replace the PCB however, just opened and sprayed a lot of silicon oil into the dial.