“In the online (web based) manual, only 2 of the 4 ports support 4K at 120hz - but it doesn't say which two. In the PDF version of the manual, it states port 3 and 4 should be used. In the specs on LG's site, it says eArc is port 3, but port 2 says eArc”
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HDMI 3 and HDMI 4 on the LG UHD 85 Series 86 inch Class 4K Smart UHD TV with AI ThinQ® (85.6'' Diag), Model # 86UN8570PUC are HDMI 2.1 ports and HDMI 3 supports HDMI eARC functionality. HDMI 1 and HDMI 2 are HDMI 2.0 ports...^IFV
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