Use a TV that supports 120 Hz refresh rate
Connect a device that can output 120 FPS or 120 Hz
Use HDMI 2.1 ports on both the TV and the device
Use a certified Ultra High Speed HDMI cable
Enable 120 Hz or Game Mode in the TV settings
Set the console or PC display output to 120 Hz
Turn on 120 FPS mode in the game if available
Use the correct HDMI input on the TV
Disable motion smoothing and other post-processing features
Update the TV firmware
Update the console or PC graphics drivers
Lower the resolution if needed to maintain 120 FPS
Make sure the game and device support 120 FPS output