I set up my new LG OLED48CXPUB TV last night. Pretty gorgeous picture. Today tried using the HDMi ARC feature to the Onkyo TX-NR609 to which it is attached, but alas no sound. Did the Hardware setup as the manual called for... pretty straight forward, even trying to repeat the setup to be sure it was correct (RIHD off, exit setup, enter setup> hardware setup> HDMI setup> and turn RIHD on). The Onkyo searches and turns up the model number of the BluRay player (which was turned off and connected to the BD/DVD HDMI input), but not the LG TV, which is connected to the TV HDMI output (and should work with ARC). I've tried powering everything off and back on after the setup (as the manual mentions this might be needed. HDMI ARC is the selected sound output on the LG. Tried in both Amazon Prime and Apple TV, still no sound to the receiver (TV/CD obviously selected as the input selector on the Onkyo... still no sound). The ARC feature works with my Sony 950G and the Onkyo TX-RZ630 (a newer AVR, obviously). It would be great to fix this. The ARC feature is important for us. Any help?