My picture shows in an original unaltered format. I have tried changing the picture mode using the remote and changing from 480 up to 1080p on my directv box. How do I make the picture appear normal, like my other hd tvs

Look for the format button on your remote. It will show options like letterbox, original, stretch, etc... Change the format to one which best suits your needs.

Have you tried going to menu then to video options, screen size should be in that menu, also have got a zoom funtion on the remote, if so try using that. Do you have the owners manual, if not I will try to find a copy in PDF file format, just let me know.

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.
You should have its original remote control to enter the service mode. No universal remote control will go.

U have the tv original remote wright?Yes?U must have the tv original remote to do any adjustments to the tv for a screen sizes pictures.Look at the tv original remote carefully for any buttons on the tv remote like Aspect Ratio,Zooming - +,Picture,Picture size,Display,LCD Mode,VIEW MODE.Pushes one of these buttons a couples times to choses the correct pictures sizes for ur tv screen or what u wanted to be.

U using the tv original remote wright?Yes.Check ur tv remote control for a button like View Mode,Aspect Ratio,Picture Zoom,P.Size.Pushes one of these buttons to ajust the tv picture screen sizes.

Hi welcome to Fixya,
Presently there are 16 formats (sizes) transmitted and you may need to hit a button to show a full screen sometimes on some channels. The format , aspect or size buttons are on both the TV remote and any cable / dish remote you have . set the TV to full or 16x9 if using a cable / dish box, then set the box to the stretch mode and the picture should be full, there may also be a zoom setting that will fill the picture but may cut off the edges.
Respond with more details or try the suggested settings
Thanks
Roety

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

Look in the settings in the u-verse setup if it's HD box.

Model L40HD33DYX15 we have sound, but no picture. ?

If you have the original remote you will find underneath the little door at the bottom of the remote a format button.If you do not have the original remote you can go to prefrences in the menu and change the format settings.

try the format button on the remote to see if it changes the picture size.
wg