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Hi, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, bear with us; re-confirm and post back with the complete model number of the TV.
Additionally, is the TV directly connected to an antenna or cable feed? ...or is there a cable box?
Sorry, but it would appear that there is a cable box based on "...small black 2in by 3in box..." What is the model number of this box please?
Additionally, please describe how the cable box is connected to the TV using what kind of connection(s).
Thank you for allowing me time to check over these models and compose my reply.
The DMS-2002U is a remote control.
What is the model number of the cable box please?
If the cable box is connected to the TV using coaxial cables, then the TV must be set to Ch 3 (or 4 depending on the settings of the cable box). The scanning would have to be done at the cable box and not at the TV.
Are you able to set the TV to Ch 3 ?
Sorry but why would a computer be involved in channel selection or even the volume buttons? "...channel buttons on computer are crossing with the volume buttons..."
The TV would have to be set to Antenna (even if no antenna), TV as its INPUT and then be made to be fixed set to Ch 3 (if indeed there is a cable box and its built-in RF modulator is using Ch 3).
Yes please; when able.
Additionally, unplug the cable box for a period of time to simulate a soft reset.
Sorry but I was under the impression that this is a working pair and the auto scan issue was just recent.
...not "...unplugged for a couple months ..."
Allow me to opt out and re-open the question in the hope that another member of the site can provide an alternate approach to your concern.
Still, good luck with the Dynex.
Done; refund request forwarded.