I have a Samsung SIR T151. On the back is a resolution select switch. I can select between 480i, 480p, 720p, 1080i. I have a Sony 57WV700 RP TV. It's capable of all of those resolutions. Where do I set the switch? Does it have anything to do with the resolution being broadcast by the TV station? When I switch between the different modes, nothing seems to happen.