Why won't your GE universal remote change the channels on your Symphonic Television?

It's hard to say. Try programming it to another set and make sure the remote works. If it does, fasten your seatbelt. There are a few "hard-headed" manufacturers who make sets that have remotes with "oddball codes" and they cannot be replaced with the universal remotes. Some Symphonic sets are like this. Buy a remote from a company that will take it back if it won't program to your set. Ask them up front about returns. Radio Shack is one such company that will take the remote back if you cannot make it work with your unit and you return it with all the stuff it came with - including the receipt. Good luck.