In case you have found that your TV or set-top box (STB) remote does not work there seems to be a easy way to figure out if indeed the remote has issue or TV/STB has issue or battery has a issue. This i learned from my cable repair person.
First you need a camera mobile and put into camera mode. Show the infrared LED portion towards the camera lens. Focus your camera so as to see LED distinctly. Then press any remote key. Then in camera you will see light emanating from the LED if it is working. Try different keys to ensure it is not some key issue. Change the battery and see if it is a battery issue. Even after battery change it is not working it is time to change your remote.
First you need a camera mobile and put into camera mode. Show the infrared LED portion towards the camera lens. Focus your camera so as to see LED distinctly. Then press any remote key. Then in camera you will see light emanating from the LED if it is working. Try different keys to ensure it is not some key issue. Change the battery and see if it is a battery issue. Even after battery change it is not working it is time to change your remote.