I have a Mitsubishi Television Model CS-35707 year 1996. Recently I noticed that when I turn on the TV I get great sound and no picture just a black screen. But when you touch the programming buttons on the TV Or remote they work no problem and you can read the menu on the TV screen, but no picture. I don't know if picture is trying to come in because on the right corner of the television you see a small line of picture. Can someone please explain the problem?