Hi, I'm reviewing a CCTV system, with 4pres-video-balum utp cable and 120 AC independent power outlet, working in perfect condition as far as installation is concerned, but I have 2 cameras from the above mentioned that stayed in night mode that is to say it looks only black and white (gray) to be more specific, check voltage 12vdc, regulator and video valum and even try another camera and everything perfect, it's a problem with the camera What could be failing in the internal circuit of the camera? Could it be a relay? Is the photocell the only LED that has this model? or intergraded? Do I need advice to face this fault? beforehand thanks greetings from Venezuela Jesus Vera