I've used either an antenna or an amplified antenna for my Magnovox 19MD357B TV for the past 3 yrs and 10 months. All of a sudden, the TV won't pick up any channels. I've tried two different antennas that I know work, but the TV won't pick up any channels when I run the auto program function for antenna. What is wrong with my little TV? I LOVE this tv--great to have it in the kitchen.