Electronics Repair Questions? Ask an Electronics Technician
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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:
(#) symbol under the 9 key
Find any buttons with those labels and use them to attempt to correct the picture size. If you are unable to find those buttons, or they don't help, then the settings are hidden deeper in the Cable Box and I will need the BRAND and MODEL of the cable box.
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Use the Panasonic remote and go into MENU--->Picture---->screen settings--->OK. Try each of the selections one at a time (Overscan/H.Size/Zoom, etc.) and see if one of them allows the picture to fill your screen. These instructions are also outlined on page 53 of the manual at the link below: