The picture is too big for the screen. how can i make the picture match my screen size?

the aspect ratio is the picture size control
when you select aspect ratio you have to move with the arrows to get the size that fits the panel the best - go ok then exit to save the setting
if that doesn't work the the tv will need attention in a repair shop

its setting the screen format . take the factory remote and by using the cursor left or right you can scan the size changes

You do not worry at all, because the set is under warranty.

Launch a complaint and sit peas fully.

Go to the picture setup of your settings menu.
Somewhere in there are options for selecting picture size.
The options will be similar to: Normal, Wide, Zoom, Stretch
You have probably selected Zoom, try Normal.

Change the aspect ration in the picture menu for a different apperture.
Hope that helps.

try checking the menu setting on your Dish Network, there may be a television format in that menu set up, if it is only when a dvd player is playing, then check the format on that, so on so forth... that is one place to start, check if it is local (TV) or if it is from attached component ( Dish dvr/ dvd etc). also refer to your owner's manual.. if all else fails, call customer service @ insignia

Is this coming in signal is Free air or cables.
If it Free air u can't not adjust sub channels in most stations for screen sizes.

you need to adjust your aspect ratio, look for a button on the remote labled pic size, aspect, or wide mode. That will fixya

type in PT-47WX51 manual in your search bar and there is an online manual from fixya. It will take you through setting up your tv.

You should have a button or setting on the remote that says "picture size" or "aspect". One of those is set too "zoom" mode which will cut off the bottom and top of the frames. You want it to be in 16:9,Normal or Full mode (or whatever your set call it) to get the correct aspect. Or if you have a HD satellite rcvr. you might of placed it in the zoom mode as well.