Modern TVs like Xiaomi Mi TV 4S with a diagonal of 55 inches, equipped with advanced display technologies, among which a special place is occupied by the HDR (High Dynamic Range: This technology extends dynamic range, allowing the screen to display a deeper black and brighter light areas simultaneously, making the picture as close to reality as possible. 4K-When using a display, users often experience the image appear faded or gray if the function is not activated correctly.
The problem is often not with the TV itself, but with the settings of the external signal source or cable used. In order for your Mi TV 4S to reach its potential, you need to perform a number of specific actions in the system menu. It is important to understand that automatic mode switching does not always work perfectly, requiring manual intervention to ensure stable operation of the extended dynamic range.
In this article, we will discuss in detail the algorithm of actions that will allow you to enjoy quality content. HDMI-cables and features of the work of various formats HDR, supported by your model.
Verification of support for formats and requirements
Before you go to menu settings, you need to make sure your signal source is actually broadcasting. HDR-content. Xiaomi Mi TV TV 4S 55 supports standards HDR10 and HLG, But it's not streaming services or media players that default to sending a signal in that format. SDR-signal, the TV will not be able to activate the high brightness mode.
A critical element of the chain is the cable. HDMI. For transmission 4K-Video with high frame rate and extended dynamic range requires a standard cable HDMI Using older 1.4 cables will be a bottleneck limiting channel bandwidth.
- 🎬 Make sure that subscription to a streaming service (Netflix, YouTube Premium) allows you to play in the video. 4K HDR.
- 🔌 Check the cable markings. HDMI — It should be marked with "High Speed" or "Ultra High Speed".
- 📺 Make sure the content is marked with an icon HDR Dolby Vision in the application interface.
Often users forget that the TV's built-in apps may work differently than the external consoles.A PatchWall or YouTube player on Android TV can automatically detect screen capabilities, whereas an external console or PC requires manual configuration.
Activation of the extended HDMI format in settings
The most important step without which the inclusion HDR Xiaomi Mi TV 4S It is not possible to switch the operating mode HDMI-By default, the TV is in standard compatibility mode, which limits color depth and brightness to ensure that you work with older devices.
To do this, go to the main menu and select Settings. Follow the Settings → Logins (or Ports) path, and you will see a list of all available HDMI connectors. Select the port your device is connected to (e.g. HDMI 1 or HDMI 2).
In the menu, find the format option. HDMI (HDMI Format. It's set to Standard by default. You need to change it to Enhanced Format. Once you've confirmed the selection, the screen can blink or go out for a second, which is the normal response of the system to changing the parameters of the video stream.
⚠️ Warning: If the image is lost or rippled after switching to Advanced Format, your cable or signal source does not support the required bandwidth. Return the setting to Standard and replace the cable HDMI.
Once the extended format is activated, the TV will be able to receive a signal with a chromaticity of 10 bits and increased brightness, without this step, all other settings will be ineffective, as the input signal will be cut to the basic SDR parameters.
☑️ Activation checklist HDMI
Set up image parameters for HDR
Once the signal is technically capable, the parameters of the matrix must be adapted. The Xiaomi Mi TV 4S has several preset image modes, but the best option for HDR is Standard or Bright, depending on the room’s illumination. The Mode “Cinema” often artificially understates the brightness, which contradicts the essence of HDR technology.
Go to Settings → Image. If the TV has correctly identified the signal, an “HDR” notification may appear in the corner of the screen. If this does not happen, try manually selecting the image mode. In some versions of the MIUI TV firmware, a separate HDR+ switch or similar post-processing algorithm is available, which dynamically improves contrast.
Pay attention to the Local Dimming option if available in your version of the software, setting this option to the High or Maximum position allows the matrix to more accurately control the backlight in dark scenes, which is critical for displaying depth in black.
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For a viewing. HDR-At night, it is recommended to turn off aggressive noise cancellation, as it can create artifacts on sky gradients or shadows.
You don't have to rely on automatic settings. The light sensor can misinterpret the conditions in the room. To get the best picture, you'd better manually set the backlight brightness to the maximum value, and leave the range in 2.2 or BT.1886 mode.
Comparison of display modes
Understanding the difference between the screen modes will help you choose the optimal balance between power consumption and picture quality. Below is a table showing the differences between the standard mode and the extended one available on Xiaomi Mi TV 4S.
| Parameter | Standard mode (SDR) | Extended mode (HDR) |
|---|---|---|
| Color depth. | 8 bits (16.7 million colors) | 10 bits (1.07 billion colors) |
| Maximum brightness | Limited by standard | Increased (up to 1000 nits and above) |
| Color coverage | Rec. 709 | Rec. 2020 / DCI-P3 |
| Contrast | Dynamic (framework) |
As you can see from the table, the transition to extended mode gives a fundamental improvement in the number of shades displayed, this is especially noticeable on gradients, where in normal mode there can be a "ladder" effect (banding), and in the case of a "grid" effect. HDR-transitions remain smooth.
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The main advantage of the extended mode is not just brightness, but the ability of the screen to display very bright and very dark details simultaneously in one frame without losing information.
Working with external devices and consoles
If you connect a game console like the PlayStation 5 or Xbox Series X to your TV, setting up the TV itself is only half the battle.The console also needs to be configured to output the HDR signal. Often times, the TV is ready and the console continues to run in SDR mode.
On game consoles, you need to go to the screen and video output settings, and you should find the HDR option and select Automatic or Always On mode. Also make sure that the color depth is set to RGB or YUV444 if the cable supports this bandwidth.
For PC users, the situation is similar: in the control panel of the video driver (NVIDIA Control Panel or AMD Adrenalin: set the color depth to 10 bits (if available) and dynamic range to Full. YUV420 Can limit support HDR partly.
⚠️ Note: When connecting a PC through HDMI Make sure that in Windows 10/11 in the section "Display settings" the switch "Use" is activated HDR". Without this step, the desktop will look pale.
Some older consoles or media players may not automatically detect the type of display, which may require manually specifying the type of device connected in the console menu (selecting "4K HDR TV" instead of "1080p TV").
What if HDR is not included on the console?
Problems and diagnosis
Despite the right settings, users may find themselves in a situation where the image remains dim. One common reason is that the image is used in a very different way. HDMI-extension, switch, or receiver that does not support a full protocol HDCP Any intermediate element of the chain shall be certified to HDR.
It’s also worth checking the version of Android TV on your TV. Manufacturers often release updates to fix video processing bugs. Go to Settings → About TV → System Update and check for new versions of the software.
- 🔄 Reset the image settings to factory values if the colors look unnatural after turning on HDR.
- 🔆 Make sure the power saving mode is turned off, as it forcibly reduces the brightness of the backlight.
- 🎮 When playing games, check if a particular game project supports technology. HDR (Not all games have this option).
If none of these methods worked, try resetting the TV completely. Sometimes a software glitch in the image processing module can block the activation of advanced features.