Iv'e recently acquired a Samsung OLED UHD 4K T.V. which is hooked up to a Sky box and Sony surround sound system. The issue is that when I tune in to a radio station using the Sky box, I am unable to turn off the TV screen completely. as the icon of the radio station remains on screen permanently. If the TV is turned off (which I used to do successfully with my previous Panasonic TV), the radio station remains on line for only a short time ( sometimes for a few seconds, whilst occasionally for several minutes) before turning off.
How can I continue to listen to the radio without wasting electricity in having the TV screen on?