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What if I just switch out the 512 with the 612 will I be able to get HD content or do I need to switch out the dish to receive HD? My old TV was a 1st gen Plasma so it was not capable of HD, and the problem with my new TV is that the picture was a smaller square on the screen then when I told it...

I currently have a Dish 512 receiver that is located outside my room so I have a UHF remote to control it. I purchased a new TV and it does not have the Svideo connection only HDMI and the AV input, when I connect to the AV input it looks terrible, everyone is telling me that I need to connect...