MY 65" LG HDTV may be going bad. When I turn it on to Dish Network I get a light screen with lines running horizontal and vertical with no picture. I switch my AV receiver to my TiVo and the picture comes in but it is washed out, but clears up after a few seconds. I switch to Roku and the picture is washed out, but comes in clearly in a couple of seconds. Then, if I go back to Dish the picture is clear. Sometimes when the program changes sceens, the picture come in washed out and then clears up seconds later. Is my tv going bad? Sometimes it does it and sometimes it is perfectly clear when I turn the tv on. I have all the latest HDMI cables. It happens on all inputs, so it has to be the tv or the av receiver. The TV is about 4 years old.