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Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, bear with us; re-confirm and post back with the complete model number of the TV as procedures and code would be strictly dependent on the correct model number.
Appreciate the additional information.
Is the remote in use the original? And are you able to select A/V (Video) input mode?
Since "...the tv/av button works...", then a possible workaround would be to connect the satellite receiver as an A/V source.
What is the model number of the satellite receiver please?
This appears to be another issue.
Please describe how the DISH VIP 722K DVR is connected to the DU1301A using what kind of cable(s).
It would seem that the issue is not the VChip or code. The TV is kicking in auto-protect mode based on the picture and descriptions provided. Have you tried placing the TV not on top of the satellite receiver?
If the above is not corrective, then the question would be re-opened as I would be opting out.
Please expect an email if another has posted an alternate approach to your concern.