I think you should be able to teach this....we have touch light Sadie turns on and off and really the trick shouldn't be that different. A few questions first.
Do you clicker train?

Have you ever taught her to "touch" or to
"target"?

I would first get her interested in the tv. Take her by it and encourage her to "touch" Anytime she puts a paw on the tv, click and treat. Slowly up the requirement getting her to hit the right button. Lots of encouragement, treats and patience and you should get it. Once she has it you can change the command to get the tv or turn off the tv or whatever. Good luck!!