Toshiba CX36F67 36" TV "rectangles ratio" Questions

black rectangle on bottom half of screen I have a Zenith SEQ stereo television, Model # SMS2518RK, Serial # 481-34251-043, manufactured in June of 1994. Suddenly, a black rectangle appears on the ...

I have a CF36F67 tv that has a black rectangle covering about 2/3rds of the bottom half of the screen. Going to a menu will get rid of it until I let the menu time out and then it comes back. I've ...