I was recently given a Toshiba 56HM195 by family friends. It worked just fine for them when connected to an HD cable box, but when connected to a standard cable box, picture quality gets scrambled. The box Im using just has an coaxial input from the wall to the box, and an output from the box to the tv. There is no component output or HDMI output from the box. I'm wondering if there is any fix to this problem. Thank you!