Hi I have a UE49KS7500. Recently the universal remote has compeltely stopped working - I've tried changing the battery and resetting the TV. The smart remote still works but only button not working is the power off button so I have to turn the TV off using the little button under the TV set itself. 

Any ideas? I don't understand why on the smart remote for example only the power off button is not working.

for both remotes the red led lights come on when you press a button so there is power there. 

thanks

Alastair