Often times, there are two sets of settings for picture size.
One resides in the television itself.
The other resides in the cable/sat/DVR box.
You might consider turning your television to 16.9 settings, and then changing the input on the cable box. Some boxes allow you to easily find the menu system to change the picture size, others can be difficult and require a call to the cable/sat service provider to walk you through.
Keep me posted.
Input initially HDMI and picture was fine. But we were unable to record programs on our Samsung DVD-VR320 (DVD-VCR Combo), so techician changed input to AV1/DVD and now we can record DVD's and Tapes. However each channel picture is a different size now, and we cannot see top or lower parts of picture. We are using Time Warner Cable Box and Remote, and Samsung DVD Remote for recordings. Is there any way we can restore picture size to normal (The way it was with HDMI ?)