Does the red led under the TV-on/off button flash each time you press the volume button? In my case the contacts of the rcu have become worse after some month of use and I have to press strongly to get a reaction. Only if the red led is flashing the ir led is flashing, too. You can test the function of the ir led by observing this led on a camera display, too. The picture sensor of cameras is capable of seeing the ir light and you see it on the life display.