vdeanes

I've got a molynx CCTV system installed and the 'sync' light keeps flashing on the controller. I'm assuming this is the reason the joystick and camera monitor system isn't working now? I bought a second hand controller and new monitor /joystick controller but the 'sync' light is still flashing and I still can't interchange between cameras. Can anyone advise on what is wrong or what I can do please to sort this problem?