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The LG NanoCell 85 Series 2020 55 inch Class 4K Smart UHD NanoCell TV w/ AI ThinQ® (54.6'' Diag), Model # 55NANO85UNA does not have an HDMI ARC port, it has an HDMI eARC port (HDMI 3). HDMI eARC is not really backward compatible with HDMI ARC. If your TV is HDMI eARC enabled, but your AV amp or soundbar is only compatible with HDMI ARC, it's likely you'll get a sound - but the bandwidth restrictions of ARC will mean you won't be able to experience the high bitrate audio that eARC can provide. So no, it's not backwards-compatible...^IFV
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