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Put new batteries in and try again. Sometimes the IR sender may also not be working properly due to a loose connection.
I would also suggest to open the remote and clean the contacts using alcohol. Rub the contacts on the key pad and remote gently.
Hope this works.
Remote problem could arise from either tv or remote. First check your universal remote on some other tv and if it is okay your tv's infrared sensor has stopped working. You can get it from the local component shops, take the existing sensor with you. This problem could be from the micro processor in rare cases. Best of luck.
I had the same problem with my remote...over time it slowly stopped working. (sorry for poor terminology) I noticed that one of the battery terminals was corroded and that the metal connecting the battery to the board was completely gone. I simply swapped this out with one from another remote and now its working fine. Seems the only issue is that the battery was not connected.
Yes, I have been seeing a lot of those Toshiba IR receivers bad lately. Replacing it with a new one should take care of your remote problems. If you have never replaced small parts on PC boards then have a qualified tech handle it for you.