NEIL_Auburn

I have a COMPOSITE signal from a VCR that passes through a DENON AVR to my LG OLED at the composite connector (red, white, yellow) on the TV. I think it had displayed video in past use. But now it does not. TV home shows AV1 connected. Screen goes BLACK (hint?) Then if yellow video plug disconnected, MSG from OS shows "NO SIGNAL CHECK INPUTS." I think TV thinks a signal is applied when the video cable is plugged in but somehow doesn't display the program!!! I have confirmed good video signal on cable direct from devices and from DENON with a portable TV!! So, what might be setup up wrong or failed in my OLED TV setup??? Any help will be appreciated. Neil