Facing TV Problems? Ask a TV Technician.
First, reboot the Cable/SAT box by disconnecting it from power for 10 seconds and plugging it back in. Upon rebooting, if the screen aspect is still incorrect, then look for the following buttons on the Cable/SAT remote:
AspectZoomHD ZoomRatio(#) symbol under the 9 key
Find any buttons with those labels and use them to attempt to correct the picture size. Let me know what happens.
If you need further assistance let me know. Before you go, PLEASE DO click at least a 3 STAR RATING, at the top of your screen. That is how I am credited for my efforts by the site. You can follow up any time as needed at no additional cost.