Thanks for telling me what I'm doing is incorrect without offering help. I am fully aware this is not how you should be hooking up the TV. However, I have been told by LG there is no way to get a full screen image for SD channels without using zoom. Zoom is no good as it also makes the cable menu zoom and unusable. I have tried all combinations of output from the cable box with all of the TV aspect ratios and nothing gives full screen with HDMI. If you can offer another solution, I would gladly use that but at the moment AV is the only way to sensibly get rid of the sidebars. Not only are side bars annoying but they also cause image burn according to CNET. As I have no HD signals, that means ALL of my channels have sidebars. As for switching from SD to HD, my last Viewsonic was able to do this with one click of the remote.
Guys what gives with all pointless posts on this forum? If a person posts that they want to do something with their TV, that is their preference. They are looking for help, not comments on how incorrect or silly what they are doing is. If you do not have a suggestion as to how to help fix the issue, then don't post at all.