Thanks! A very good explanation!veryoldschool said:This has stripped everything off of the video, so your TV is doing what it has to.
You do want to change to 16:9.
What the difference is has to do with the other format options.
Currently with 4:3, you have the option for HD in letterbox, which you don't need, but don't have the option for pillarbox for SD, which you might want.
Changing to 16:9, gives you the option for SD format changes and nothing for HD, which you don't need, as your TV is 16:9