Do you get a picture on any channel? Clear/fuzzy/or just snowy screen and static? On all channels?
Are you analog or digital (NTSC or ATSC) and is your tuner internal to the TV or an add on like mine.
Here's a link (no idea if it will help your situation) with some info on TV connections and adding an ATSC
tuner to an analog setup. There may be something in it that "rings a bell" for you.
Good luck and keep us posted, there's lots of experience on here for all kinds of problems,