Screen refresh rates (measured in hertz, Hz) are a key parameter that affects picture smoothness, viewing comfort, and even eye health. On Xiaomi devices — whether Mi TV, Redmi Smart TV or Mi Desktop Monitor — this option can be changed manually, but the interface does not always offer all the options available. In some cases, the required settings are hidden in the engineering menu or blocked by firmware.
In this article, you will find step-by-step instructions for all current Xiaomi models, including how to unlock hidden modes (for example, 120 Hz on supported devices). We will also discuss why some Hertz may be absent from the menu, how to check the real screen frequency and what to do if after changing the image begins to “break” or sound disappears.
Why you might need to change hertz to Xiaomi
The screen refresh rate not only affects the visual experience, but also the technical aspects of the device, and here are the main reasons why users want to change Hz to Xiaomi:
- 🎮 Game consoles: PS5, Xbox Series X or PC requires 120 Hz to make full use of opportunities (for example, 4K@120Hz on Mi TV Q2).
- 👓 Eye fatigue: When watching movies or working behind a monitor for a long time, 60 Hz can cause less stress than 120 Hz.
- 📺 Broadcast standard compatibility: in some countries (e.g. Europe) broadcasting is at 50 Hz, and if the frequency does not match, artifacts can occur.
- 🔧 Technical limitations: on budget models (e.g. Redmi Smart) TV A Series) 120 Hz may be locked by firmware but unlocked via an engineering menu.
It is important to understand that not all Xiaomi devices support high frequencies. For example, Mi Desktop Monitor 27 monitors are limited to 75 Hz for hardware reasons, and Mi TV P1 series officially support 120 Hz only on HDMI 2.1 ports. Before changing the settings, check the characteristics of your model on the official website or in the documentation.
How to check the current screen frequency on Xiaomi
Before you change your settings, make sure you know the current frequency of your device, and on Xiaomi TVs and monitors, you can do this in a number of ways:
- Settings menu: Go to Settings → Display and Sound → Resolution and frequency. This will show the current value (e.g. 3840×2160, 60Hz).
- Test videos: YouTube has videos to check the frequency (e.g. 120Hz Test) If the picture is smooth, your screen supports that frequency.
- Using the engineering menu (for advanced users): On the remote, press sequentially Menu → Settings → All Settings → General → Device Preferences → About → Build, then quickly press 5 times on OK. In the menu that opens, find Display Info.
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If you see a ripped picture when watching a 120Hz test video, your TV is running at a lower frequency, even if the menu says 120Hz. HDMI-cable.
On Xiaomi monitors (such as Mi Surface Display) the current frequency is displayed in the OSD-menu (Menu button on the case) or through software on a connected PC (in Windows Screen Settings or macOS Display Settings).
Change hertz through the standard settings menu
The safest way to change the frequency is to use the built-in settings, the instructions are relevant for most Xiaomi TVs (Mi TV 4/5 series, Redmi Smart TV X, etc.) and monitors:
☑️ Preparation for frequency change
- Open Settings (cog on the home screen or the Settings button on the remote).
- Go to Display and Sound → Resolution and frequency (on some models, the path may differ: Picture → Additional → Update frequency).
- Choose the available frequency from the list. The options are usually 50 Hz, 60 Hz, 120 Hz (if supported).
- Confirm the change. The screen can go out for a second -- that's okay.
If the frequency is not on the list, it can mean:
- 🔌 Limitation HDMI-Port: 120 Hz needs a port HDMI 2.1. and the corresponding cable.
- 📺 Firmware Limitation: on some models (e.g. Redmi Smart) TV A55) 120Hz is hidden but available via engineering menu.
- 🖥️ Signal source restriction: If a PC is connected, check the graphics card settings (e.g., in the NVIDIA Control Panel or AMD Radeon Settings).
What if the sound is lost after the change of hertz?
Unlocking Hidden Frequency Through Engineering Menu
On some Xiaomi models (e.g. Mi TV Q1 or Redmi Smart TV X55), 120Hz can be hidden in the standard menu but is available through engineering settings.Caution: improper actions in the engineering menu can cause the TV to crash!
Instructions for unlocking:
- Turn on the TV and press the remote sequentially: Menu → Settings → All Settings → General → Device Preferences → About → Build Then quickly press OK 5 times in a row.
- Go to Display or Panel (the name may be different).
- Find the frequency-related options: Refresh Rate, HDMI 2.1 Mode or Overclock Panel. Enable the option 120Hz Enable (if any).
- Save the settings and restart the TV, and then the standard menu should have a 120Hz option.
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If after changing the settings in the engineering menu, the TV stopped turning on, reset to the factory settings: press the Power button on the remote and the Menu button on the TV body at the same time for 10 seconds.
On Xiaomi monitors (such as Mi Curved Gaming Monitor), the engineering menu opens by holding the Menu button on the case for 10 seconds. → Display → Refresh Rate.
Change of hertz for external devices (PC, consoles, consoles)
If you connect an external device to Xiaomi (such as a PlayStation 5, Xbox or PC), adjusting the frequency may require additional actions.
For gaming consoles (PS5, Xbox Series X|S)
- 🎮 PlayStation 5: Go to Settings → Screen and video → Video output → Update frequency. Select Automatically or manually select 120 Hz (if the TV supports).
- 🖤 Xbox Series X|S: Open the Settings → General. → TV and display settings → Video modes. Turn on 120 Hz and VRR (if maintained).
For PC (Windows 10/11)
- Connect the monitor/TV to the video card via HDMI 2.1 or DisplayPort (the latter is preferred for high frequencies).
- Press Win + I, select System → Display → Additional display options.
- In the Adapter Properties section, select the maximum available frequency (e.g. 3840×2160, 120Hz).
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If Windows does not have a 120Hz option, update your graphics card drivers (via Device Manager or a manufacturer utility, such as NVIDIA GeForce Experience).
On Mac, the frequency changes to System Settings → Monitors. However, Xiaomi devices may not support 120Hz over HDMI on Apple computers due to protocol limitations.
Problems after the change of hertz and their solution
Changing the frequency of the update can lead to problems.
| Problem. | Possible cause | Decision |
|---|---|---|
| The screen flashes or "breaks" | Incompatibility HDMI-cable | Use a certified HDMI 2.1 cable and a high-frequency port. |
| The sound is gone. | Limiting HDMI bandwidth at 120 Hz | Connect the sound via a separate output (e.g., Optical or Bluetooth). |
| The TV does not save the settings. | Reset during restart due to firmware error | Update your TV to the latest version. |
| The image has become dim | Automatic correction of lighting at high frequency | Manually increase the brightness in the settings of the Picture → Lighting. |
⚠️ Warning: If the TV stops responding to the remote after the frequency change, don't panic. Wait 10-15 minutes, sometimes the device automatically resets when there's no signal. If the screen stays black, perform a hardware reset: Turn off the TV from the network, press the power button on the case for 30 seconds, then turn it on again.
Xiaomi models with support for 120 Hz: the full list
Not all Xiaomi devices support high refresh rates, and here is a current list of models with confirmed support for 120 Hz (as of 2026):
- 📺 TVs: Mi TV Q2 75" (4K@120Hz on HDMI 2.1) Mi TV Q1 75" (Requires unlocking in the engineering menu - Redmi Smart TV X95 (120 Hz for game mode only) Mi TV P1 55"/65" (120 Hz HDMI 2.1 port)
- 🖥️ The Mi Curved Gaming Monitor 34" (3440×1440@144Hz) Mi Surface Display 27" (2560×1440@75Hz, without 120 Hz) Mi Gaming Monitor 24.5" (1920×1080@144Hz)
For models Released before 2021 (e.g. Mi TV 4S or Redmi Smart TV X50), 120Hz is not supported at the hardware level.
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Before buying a Xiaomi TV or monitor for gaming purposes, check not only for 120Hz support, but also for HDMI 2.1 ports. For example, on the Mi TV Q2, only 2 of 4 ports support 4K@120Hz.