Chosen Solution

I have an old Zenith TV which I purchased in 1990. The problem is there is white lines on top of the picture. How do I change the picture size on this old TV?

usually with older tvs their wasn’t a picture size adjustment. if you have a cable box then you can try and change the video settings on your cable box. more than likely that is set to widescreen when it needs to be set to 4:3 . good luck :)