I have a Hisense TV (65U8G) and a Yamaha AV Receiver (RX-V675) and I'm unable to enable the ARC the function. In the TV's menu, the choice is grayed out. \nI have the HDMI cable connected between the sole ARC port (HDMI 3) on the TV and the sole HDMI out port on the Receiver. I have the "HDMI Control"function enabled in the receivers menu. \n\nAt present, I have been using an optical cable between the former TV (no ARC) using AV4 which is the default. I understood the older ARC does not need any 'enhanced' cable to work. Is that correct? Yamaha's audio settings have always been confusing to me especially when it's a separate (non HDMI).\n\nAny ideas or questions if my explanation isn't clear enough??