Hello and sorry you're having problems.
Unfortunately there's no way that anybody could take control of the TV remotely- it's not a computer, just a regular TV. What you need to do in order to receive Dish on this set from the "Joey" is change the Input the TV is set to, or if using a coaxial cable, then a Channel Scan must be run (depending on which way you have the Joey connected to the set- AV cables or a coaxial cable).
That being said, the original remote control
is no longer available as "New", but there are two used replacements at the link below:
Or, another alternative is to purchase a fully functional universal remote that allows all functions of the TV to be accessed, such as the one at the following link: