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Hello there. Thank you for sharing your experience with us. We understand your inquiry regarding the OLED65C5PUA 65″ Class C5 Series OLED evo AI 4K UHD Smart webOS TV (2025). You asked if this model features HDMI 2.1 ports. Yes, the OLED65C5PUA is equipped with four HDMI 2.1 inputs, allowing you to connect multiple high-bandwidth devices—such as next-gen gaming consoles, 4K/120Hz PCs, or ARC/eARC soundbars—while taking full advantage of gaming features like 4K at 120 Hz, ALLM, VRR, and G-Sync/FreeSync support. As a first troubleshooting step, if you’re experiencing issues with HDMI connectivity (for instance, no signal or intermittent video), please ensure you’re using a Premium High Speed or Ultra High Speed HDMI cable rated for 48 Gbps. Disconnect the HDMI cable, power off both TV and source device, reconnect the cable firmly into the HDMI 2.1 port (labeled “HDMI 1 (eARC/ARC)” or “HDMI 2/3/4 (4K@120Hz)”), then power both devices back on. Navigate to Settings → All Settings → General → Additional Settings → External Device Manager → Device Connection Manager, and make sure the HDMI ultra-high speed mode is enabled for 4K120 content. https://www.bestbuy.com/site/lg-65-class-c5-series-oled-evo-ai-4k-uhd-smart-webos-tv-2025/6621824.p?skuId=6621824 If your HDMI device still doesn’t appear correctly—such as missing 4K/120Hz resolution or no audio via eARC—please send us a private message on Social Media @LGUSSupport. Our team will be happy to guide you through additional troubleshooting or schedule a service check if necessary. We appreciate your patience and are committed to helping you get the best performance from your OLED65C5PUA. —Renzo
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