Is the screw on connector mounted on the PCB or is there a jumper?
Most cameras I've worked with have a short, 5" or so, jumper with a press on RF connector on the PCB.
A few have the SMA directly on the BCB and the center connector can come unsoldered or the trace to it break. The break can be so microscopic it might be impossible to see, ohm out with a meter on low ohms, I'd use the diode measurement function.
Good luck. These things can drive a man to distraction.
?
?
