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This is a function of your set-top box (STB), and has nothing to do with the TV. I know several FiOS users with the same trouble, and it's annoying but there isn't anything you can do to "fix" it. What is really strange is that the screen size can change even on the same channel, depending on the particular program being broadcast. It has to do with the aspect ratio of the programming from the provider.
The most likely cause of this is that you have accidentally changed the screen aspect ratio. There should be a button on the Panasonic remote marked "ASPECT". With the TV switched on, try pressing the "ASPECT" button repeatedly until the picture either returns to the correct size or you are unsuccessful and cycle back to the original picture size.
You will probably find that you are currently on one of the "ZOOM" settings. The correct setting should either be "AUTO" or "16:9".
If this does not solve your problem, please post back for further assistance. If you are using another receiving device, e.g. a Sky / FreeSat or Freeview box, it is also possible that you need to change the ratio setting of the receiving equipment. Please let me know the details of any additional receiving equipment you are using if/when replying.
Most of the telivision transmissions are comes at an aspect ratio of 4:3. Wide aspect ratio is 16:9. If you try to see a picture with aspect ratio 4:3 to wide 16:9, it will look like stretched. it is not the fault of the tv. Most DVD recording have the aspect ratio of 16:9 [Wide]. This aspect ratio will be displayed correctly when your tv is also set to wide mode. If you select normal mode at this condition, the picture will be displayed elongated. Ok Your Tv has no probelm.
Normal aspect ratio is 4:3, and the wide aspect ratio is 16:9. If you play a game meant for 4:3 and you change the TVs aspect ratio to 16:9; part of the picture will be cut off. It is not the fault of the TV.
The issue your having is aspect ratio. Some programs and commercials are broadcasting in a higher resolution so some fill the screen and some have black bars top and bottom. I suggest searching "aspect ratio for video". It would take me all night to type it out. But you need to know how the different resolutions change the size of your image. Also in the TV's menu you should see an aspect ratio option. Try the different settings to see if you can find the best.
This is a quote of what Sanyo told me: "The aspect ratio can only be changed
when the unit is in the video mode." So I tried switching modes with the input button and it worked but went to like a letter box/wide screen type of picture, which doesn't help me. We have dishnetwork and on the Panasonic plasma we can adjust the ratio with their remote so I have two options there but not with my Sanyo unfortunately. Hope this helps