My sanyo hdtv plasma won't show the whole picture but it worked fine yesterday

Hi my name is Roety,
I can help you with your issue ,
　
　
There are a few buttons to adjust the picture size on different make TVs and even on the Cable/Satellite remotes .
1.Format
2.Aspect
3.Size
4.Zoom
5.Wide
6.#
First look on the TV remote, set it to Full ,Fill or Just or 16 x 9 (whichever your model uses) Samsung uses the P size button ,
Then on the cable/dish Box remote stretch (not zoom) is usually best.
On the box remote set the output resolution to 1080i only
And use 16x9 when if offers a choice.
Cable remotes use the # key as a zoom/size button.
Due to the fact there are 16 size/Formats available (3 or 4 being transmitted now). you may have to hit the zoom/stretch button on some HD channels.
But with these settings the picture will mostly stay full and help you avoid image burn from the edges being not on the edge.
Stretch will fill the screen and allow you to read the bottom.
Make sure you are on the correct input, sometimes TVs are connected on multiple inputs
(not necessary, only the HD input is needed)
　
If I have helped you with your issue
If you have more questions you can still respond
I will reply asap
Thanks

I’m happy to help further over the phone at https://www.6ya.com/expert/eric_ab7c09ec01841771