Quaser

Question

My Friend gave me a 45" quaser tv about 3 months ago. Everything was working fine till i came home to watch tv in bed and i noticed the Screen was 1/2 its size just the bottom of the screen. I shut the tv and in the morning turned it back on and noticed the screen size has diminished more there is only a strip of about 3-4 inches in the center of the tv that is viewable. I am not sure exactly how old the tv is? Can you help?