Does your TV have a remote? Does that remote have an "Input" button? If you press it, does your TV display a list of choices?
If the answer to all 3 is yes, then one of the choices is currently selected to show the cable, and there's another choice for the A/V input. If you select that with the remote and select OK you won't be watching cable any more. At that point, the A/V inputs are being used by the TV.
True. In theory. But I can switch to A/V, HDMI I, II, and III, YPbPr, and PC. I don’t know what YPbPr is, and I think PC is Personal Computer. The others are, to me, self-explanatory. Nevertheless, no matter what I choose, the DVD player doesn’t work. Faulty DVD player? I just tossed two of them because I knew they had outlived their usefulness. I wore them out.