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The Roku will have a setting to set the aspect ratio/format have you tried that?
No that is the resolution its actually the format or it may be termed aspect ratio ?
To set the roku to 16:9
What Roku is it?
ok just give me a min
Sorry I am having trouble accessing the data I will get back to you asap
OK when you are ready please send e the complete model number of the Tv found on the back of the set, you have sent the media receiver model
OK the zoom button or aspect ratio/format on the TV remote what happens when you adjust that?its clear the aspect ratio is incorrect here that is why the picture is overscanned
Let me know please