I recently had an electrical incident when hooking up my laptop via HDMI to my older Panasonic Plasma TV. I don't know exactly what happened but I heard a pop and my USB-C to HDMI dongle and HDMI-3 on the Plasma were both fried. Since then I can no longer get a picture from the 975 to the Plasma. Source devices connected directly to the TV work as did the ARC output from the Plasma to the 975. After a lot of effort, I ended up getting a TE HDS-42AVR from Outlaw (which is also an HDMI conditioner per TE). It solved my problems. Of course your results may vary.