A:Answer The LG - 55" Class - LED - UK6090PUA Series - 2160p - Smart - 4K UHD TV with HDR, Model # 55UK6090PUA has a 60Hz Refresh Rate and TruMotion 120 which LG's name for motion interpolation, which is a feature that increases the frame rate of the video, and has the effect of making movements look smoother, clearer and more lifelike than what you typically see from movies and TV especially when watching fast moving video or sports. All the HDMI ports on the LG UK6090PUA 4K HDR Smart LED UHD TV - 49" Class (48.5" Diag), Model # 49UK6090PUA are HDMI 2.0 ports and they are all HDCP 2.2 compliant. All the equipment in your video signal path must also be HDCP 2.2 compliant otherwise the video signal will not pass through to the TV. If the HDMI Out on your receiver is not HDCP 2.2 compliant, the video signal will not pass through to the TV if you are attempting to watch 4K content. Your previous TVs may have been HDCP compliant but not HDCP 2.2 compliant which is why they worked with your receiver. ^CP
