Why Xbox Series S 120Hz Stops Working
If your Xbox Series S 120Hz not working issue appeared after a settings change, system update, or TV swap, the cause is usually a compatibility mismatch rather than a console fault.
The problem often comes down to resolution limits, HDMI bandwidth, display mode support, or a game that does not actually output 120Hz.
The Xbox Series S can deliver 120 frames per second, but only when the console, TV or monitor, HDMI cable, and game all support the mode at the same time.
One weak link is enough to force 60Hz or make 120Hz disappear from the menu.
Check Whether Your Display Actually Supports 120Hz
The first thing to verify is the display itself.
Many TVs advertise “4K gaming” or “game mode,” but that does not always mean they support 120Hz at the resolution you are using.
- Look for native 120Hz support in the TV or monitor specifications.
- Confirm the HDMI port supports 120Hz input, not just one specific port.
- Check whether 120Hz works only at 1080p or 1440p, not 4K.
- Review the manufacturer’s gaming feature list for terms like HDMI 2.1, VRR, ALLM, or 120Hz.
Some displays support 120Hz only when game mode is enabled.
Others disable advanced refresh rates when features such as motion smoothing, sharpness enhancement, or certain picture presets are active.
Set the Xbox Series S to the Right Resolution and Refresh Rate
The Xbox Series S output settings determine whether 120Hz is available.
If the console is set to a resolution or color mode your display cannot handle at that refresh rate, the 120Hz option may disappear or fail to apply.
- Open Settings on the Xbox.
- Go to General and then TV & display options.
- Set Refresh rate to 120Hz.
- If the option is unavailable, lower the resolution to 1080p or 1440p.
- Test the display again after changing the setting.
On the Xbox Series S, 120Hz is commonly easier to use at 1080p or 1440p than at 4K.
That is normal for the console and often resolves the issue immediately.
Use the Correct HDMI Cable and Port
A poor cable or the wrong HDMI port can block 120Hz even if everything else is compatible.
The Series S ships with a high-speed HDMI cable that is suitable for the console, so using the included cable is a good baseline test.
- Use the original Xbox HDMI cable if possible.
- Replace any older HDMI 1.4 or damaged cable.
- Connect the console directly to the TV or monitor.
- Try a different HDMI port on the display, especially one marked for gaming or 120Hz.
AV receivers, soundbars with passthrough, and HDMI switchers can also interfere with the signal.
For troubleshooting, remove those devices and connect the Xbox directly to the screen.
Why Does 4K Sometimes Disable 120Hz?
Many users run into Xbox Series S 120Hz not working because 4K output and 120Hz are not both supported by their display or cable combination.
Some TVs can do 4K at 60Hz or 1080p at 120Hz, but not 4K at 120Hz.
To test this, switch the Xbox to 1080p and enable 120Hz.
If that works, the issue is not the console; it is the display’s resolution and refresh-rate limit.
You can then decide whether to prioritize resolution or refresh rate based on the game and screen size.
Check the Game’s Own Performance Settings
Not every game can run at 120fps.
Some titles require a specific performance mode, while others only support 120Hz in multiplayer or on certain graphics presets.
- Look for in-game options such as Performance Mode or 120 FPS Mode.
- Check whether the title needs a restart after changing graphics settings.
- Verify that the game is updated to the latest version.
- Confirm that the game actually lists 120fps support from the developer or publisher.
Games such as shooters and racing titles are more likely to support 120Hz than cinematic single-player games.
If the Xbox dashboard is set correctly but a specific game still feels limited to 60Hz, the game itself may be the reason.
Turn On Game Mode and Disable Conflicting TV Features
TV processing features can interfere with a high-refresh signal.
Game Mode often reduces input lag and helps the display accept 120Hz properly.
On your TV or monitor, try enabling:
- Game Mode
- HDMI Enhanced Format or similar input enhancement
- 120Hz Input or High Bandwidth mode
Also consider turning off features that may cause conflicts:
- Motion smoothing
- Dynamic contrast
- Noise reduction
- Picture interpolation
Different brands use different names, including Samsung, LG, Sony, TCL, Hisense, and Vizio.
If the display menu looks confusing, check the model-specific manual for the exact port settings.
How to Verify 120Hz Is Actually Active
Sometimes the Xbox settings show 120Hz, but the display is still operating at 60Hz.
Verification helps confirm whether the signal is truly active.
- On Xbox, open TV & display options and check the current refresh rate.
- Use the Xbox video fidelity and overscan test if available.
- On a monitor, look for the on-screen display showing 120Hz.
- Test with a 120fps-capable game and watch for smoother motion and lower input latency.
If your display has an information screen, it may show the current signal format, such as 1920×1080 at 120Hz or 2560×1440 at 120Hz.
That is the most reliable way to confirm the setup.
Common Fixes for Xbox Series S 120Hz Not Working
If you want a fast checklist, these are the most effective fixes to try in order.
- Restart the Xbox and the TV or monitor.
- Use the included Xbox HDMI cable.
- Connect directly to the display, bypassing receivers and switchers.
- Set the console to 1080p or 1440p.
- Enable 120Hz in Xbox display settings.
- Turn on Game Mode on the TV or monitor.
- Try a different HDMI port.
- Update the game, console system software, and TV firmware.
If the issue started after a power outage or update, a full power cycle can help.
Shut down both devices, unplug them for about one minute, then reconnect and test again.
When the Problem Is the TV, Not the Console
If every Xbox setting looks correct and 120Hz still does not work, the display may be the limitation.
This is especially common on older 4K televisions that support 120Hz only under narrow conditions or not at all.
Signs that the TV is the bottleneck include:
- 120Hz works on one input but not another
- 120Hz works only at 1080p, not 4K
- The TV menu does not show enhanced HDMI options
- Other gaming features like VRR are also missing
In that case, the Xbox Series S is likely functioning correctly, and the display’s specifications are what need to be adjusted or upgraded.
Useful Settings to Remember
These Xbox and display settings most often control whether 120Hz works:
- Resolution: 1080p or 1440p are the best test points
- Refresh rate: set to 120Hz in Xbox settings
- Color depth: unsupported modes can reduce compatibility
- TV input mode: enhanced, game, or high-bandwidth mode
- Game settings: performance mode or 120fps mode
When Xbox Series S 120Hz not working is the issue, the solution is usually a compatibility chain check: console, cable, port, display mode, and game support.
Working through those in order usually reveals the exact break in the setup without guesswork.