When I connect the 1080p input of my camera, the image fluctuates, first it shows it well and after a few seconds “no signal” appears and after a moment the image appears again on the screen. Besides when a signal is seen, the image has a delay and behaves like a poor quality webcam.
Sorry to hear you are running into a problem here! To troubleshoot I would recommend testing the HDMI output of a different device, for example the HDMI output of a laptop would be a great test here.
Does the DC source have anything to do with it? apart from connecting and constantly dropping the signal, the image is seen all the time in slow motion