Some sets have a "full reset" function, you might want to try that.
There are discs that can help calibrate the picture, too, if you really need that.
Reduced screen size could possibly be an aspect ratio issue.
If the set is usable as a computer screen as well, there may be additional settings that are messed up...a reset should fix that.
What make/model is the set, if you can tell?
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2009.5 2720SL
2006 Toyota Sienna
2018 Audi Q7
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