I don't mean to sound condescending but on Sharp remotes the button you are looking for is usually labeled "TV/Video."
As long as you have a cable input, you can get DirecTV. Flat screens and Hi Def televisions are just owner preference. My kids have standard 13" televisions and they have DirecTV in their rooms. Hope this helps.
I do. i am the owner of M&W electronics. I specilize in on site repair of projection televisions. I am located in Phillipsburg, NJ (about 45 min away from you) I am open 6 days a week (closed sunday) give me a call at 484 542 6428