IMPORTANT: This article applies only to specific products and/or operating systems. Check Applicable Products and Categories for details.
You will need to set the HDMI® Signal format to Enhanced format in order for your source device to recognize the 4K 120Hz capability of the TV.
- Select Settings → Watching TV → External inputs → HDMI signal format
- Select the HDMI input the device is connected to (either HDMI 3 or HDMI 4), and then change the setting to Enhanced format.