Ron,
This may help or not. The camera that was intermittent that I worked on was a Weldex. It would go on and off every few minutes. The design was such that the video cable that left the camera went to external RCA connections at the back of the coach which I cleaned and that did not solve the problem. I moved on to the camera internals and found that the method of coupling the video cable to the camera board was much like a computer dual pin slide on small black rectangular plastic coupler that has holes in it, that you push down over two small pins that pass through it. Very common connection type on PC motherboards for small connectors. These connections are not really video quality connections but are common today in electronics. The intermittent restored with movement of the connectors on these pins.
I cleaned the pins with a red scotch brite scuffing pad, used a little CorrosionX on them, and then slightly bent the pins with a pair of tweezers to allow for more friction when the rectangular plastic wire connector was pushed back down over the pins.
This camera had been sent to a factory repair center and they could not find anything wrong with it. My guess is that it was working when they got it. The repair has lasted. The connectors lose tension over the years and oxidation builds up. This may not be your problem, but these connectors have been used for both power and video to the camera boards evidently, at least on this brand, and they are problematic with time. Hope this helps you or someone else.
Later Ed
