So my TV (32" Magnavox standard tv) is behaving strangely. It turns on but the color is very dim and the picture and sound will shut off within about 20 seconds. If I keep changing channels the picture will stay on. I have never had problems with this tv before. It sits next to the heater in my room so is it possible for it to have overheated? I don't smell any burning plastic. Please Help! Thanks!