When you veiw HD, and it is not a HD program on a HD channel, you get what you get you can not shrink or enlarge it, cause it is a up convert. Bottom line is, thats the way it is. Maybe there is new equipment that can but I have not heard of it, In HD apsic ratio, is controled by HD receiver not T.V., How I do it is, if it's 4.3, I switch to composite input and select 16.9 or wide then all modes work , like, full, zoom , wide. Hope this helps