I own a Magnovox 9p5511c102 for about 10 years and about a month ago the picture started to fade, shrink, and become blurry. When the problem started, the picture would return to normal size and sharpness after 5 minutes of leaving the tv on. Now, a month later, the picture no longer returns to normal size. Is there something I can do to fix this problem? An adjustment maybe? The tv has never been repaired.