How can you tell if you tv supports 720p. I have an x box and I have it set to to 720p. And the game plays. However I have a pretty cheap hdtv its a samsung I bought at bestbuy about 1 and a half years ago. It model number is something like hc551w5 or something close to that. The front of the tv only says 480p/1080i. And if it dosent what does that mean.