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You'll need to set the TV HDMI® Signal format to Enhanced format for your source device to recognize the 4K 120Hz capability of the TV.
- Select Settings → Watching TV → External inputs → HDMI signal format.
- Select the input that the device is connected to (either HDMI 3 or HDMI 4), and then change the setting to Enhanced format. Note: Do not choose Enhanced format (Dolby Vision).