how to check a tv remote whether it is working or not

1> Gather up all the remote controls that you think are not working and a digital camera.

2> Turn the digital camera on, all you need to do is look at is the digital screen while performing the process.

3> No need for turning off all the lights (but may be helpful in seeing the IR signal).

4> Point the remote towards the lens of the camera as you would when pointing the remote towards the TV.

5> Press and hold any button on the remote while viewing the screen on the camera. 

6> While holding the button on the remote and viewing the digital camera screen if you see a blueish light, that means the infrared signal is working properly, there is a problem with the direct connection (if its a universal remote, try setting it up, if its not, you're probably not pointing it correctly).