I had this problem too, and it seemed that as the camera gets old, the piece that keeps the lenses open starts to get loosen. I managed to fix it by putting a folded piece of paper between the lenses and the internal frame where the orange wires are plugged, making the needed pressure to keep the lenses open. To reach the lenses you can follow this guide Anything can be put there to make the trick. To know the exact place, put the battery and turn the camera on, you'll see that the mechanisms move a small plastic piece on the side next to the wires, this is the piece that needs to be pressed. See it marked with a red circle in this picture:
