If you are using an AV composite input, connect the video cable (yellow) to the Green jack of component input 1 on the TV, which is the Video "Y" you noted.
Are you also connecting audio to that input as well?
Also change your input to AV rather than Component 1.
Does that help?
I recently purchased a pioneer receiver for UN40C6300 TV. Unfortunately, I need to connect a single cable from the video out of my receiver to the TV in order to set up the receiver. Its' pretty straight forward. I connect the cable to the Video Y outlet and select source of Component. But it doesn't work. I tired to connect my cable box the same way and that doesn't work either. I am figuring there must be some trick here that I have not been able to see.
Does anybody have any ideas?
I have been using the HDMI connectors and so I haven't needed this function till now.