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I've been through every setting I can think of on both the Sony A80J and my 4660RW Ultra, made sure I'm connected to a 120K input on the TV with a very high quality HDMI+Ethernet cable, etc. but the Roku display auto-detect only shows 4K HDR at 30fps. I force it to 60fps and the TV display if perfect but the Roku will not play Dolby Vision, presumably and from the Roku support site, because the services all send it in 60fps. Any suggestions on a setting I may have missed?
