Hello I have a slight problem. I have a dish receiver connected to my HDTV. The quality should be better sO I found out that av cables have better quality than the coaxial that I am currently using. I have tried to unplug the coaxial from the tv and receiver and plug the av cables into the tv 1 spot on the receiver and the video 1 on the tv with no picture. Is there a way to configure the tv/receiver so that it detects the av cables plugged in in stead of the coaxial? Thanks