I have a Sony Trinitron TV and bought a universal remote but it wont work?

Someone gave me a Sony Trinitron TV but lost the remote. I have a cablevision box but wanted to buy a remote for the actual TV. I went to Radio Shack and bought a universal remote. I followed all the instructions and the back up instructions but nothing is working. Im wondering if its because a universal remote is... show more Someone gave me a Sony Trinitron TV but lost the remote. I have a cablevision box but wanted to buy a remote for the actual TV. I went to Radio Shack and bought a universal remote. I followed all the instructions and the back up instructions but nothing is working. Im wondering if its because a universal remote is not compatable with it or if something else is wrong please help
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