I need a code to program my dynex tv. We have RCN and dynex is not in the book.

If the code to program the TV to your cable remote is not in the book provided, you can sometimes look online with the type of remote you're using to find the codes you're looking for. If you cannot find the code that way, sometimes customer service may have either up-to-date code information, including codes that were not provided when your remote book was printed, or even information on how to have your remote control search for a code to use. If that doesn't work, the model of TV that you have may not have codes for that specific remote. If that's the case, your cable provider should be more than willing to give you a newer remote that would work with your TV, provided that they have a newer one to give you.