Remote control will not work. the Remote is sending the signal, but the TV is not reading. Maybe

Question

the Remote is sending the signal, but the TV is not reading. Maybe the Sensor went bad

I have the same problem with my 27" Toshiba TV. Model # 27A43. Remote won't work, even with new batteries. I purchased a universal remote and that won't work the TV either. TV works fine manually but I cannot get it to the DVD or VCR mode without the remote. I have ordered a remote receiver from Fox Intl. Is this easy to replace? What is the procedure?