Proscan PS60690 60" Rear Projection Television "run tvs digital cable box" Questions

...digital box. The other TVs are fine. I called the server they said there was no problem. What should we do? does it work ok on other inputs? such as dvd or games , etc? If so, your tuner could have ...

...tvs except the big screen.No sound or clear picture.Almost acts like the tv is set to wrong channel.There is no switching on the back of the tv and this problem just arose after watching dvd.Changed ...