A friend of mine just purchased a Denon X4500h and wants to use his cable remote to turn on\/off the TV and AVR. He has a Comcast remote and a new Samsung Qled. We did the onscreen set up which fails to turn them on but it does turn off the AVR and TV but within a few seconds, the TV turns back on. TV and AVR are connected thru eARC, cable box is connected to AVR. Any recommendations regarding set up would be appreciated. I hoping it's something simple in one of the setup menus in the Denon or TV.