How to Expand Your Screen on a Xiaomi TV: A Complete Guide to Scaling Up

Black bars on the sides of the screen, cropped titles or a blurred image on a Xiaomi TV are common problems that users face when connecting consoles, game consoles or watching movies in non-standard formats. 90% of the time, it is not the TV itself that is to blame, but the wrong display mode, aspect ratio or external device settings. This article will help you understand how to return full-screen mode without loss of quality, from basic settings to hidden functions of the engineering menu.

We have analyzed the instructions for the Mi models. TV 4S/4A/4X, Redmi Smart TV Xiaomi TV Q2/Q1E, and also took into account the nuances of working with different signal sources: HDMI, AV, built-in TV-We've focused on the problems of overscan and underscan, which are often confused. If you have any questions after reading, check the section. FAQ At the end of the article, where you can find common user errors.

1. Basic scale settings in the Xiaomi TV menu

Start by checking the standard display settings — it takes no more than a minute and solves the problem 70% of the time. Open the main menu of the TV with the Menu button on the remote (or Settings on models with PatchWall) and go to the section:

Settings → Display and Sound → Screen Resolution / Side ratio

Depending on the Xiaomi model, there may be the following options:

• 📺 Auto-TV sets the scale for the signal (recommended for most cases).
• 🎬 16:9 – Standard wide format for modern content.
• 📼 4:3 - for old movies or games (adds black stripes on the sides).
• 🔍 Zoom – zoom in with edge trimming (useful if the titles go beyond the screen).
• ⚙️ Others are manual horizontal/vertical scale adjustment (not available on all models).

If the problem persists after the aspect ratio change, check HDMI mode. Connected devices (consoles, game consoles) can force the scale to be set. For example, the PlayStation 5 or Xbox Series X often sends a signal in 21:9 format, which Xiaomi TV does not always correctly process.

2. Correction of edge trimming (Overscan) and black stripes (Underscan)

If you get out of the screen (titles or interfaces are cut) it's overscan. If you see black bars on the edges and the picture seems compressed, underscan. Both problems are solved through zoom settings, but the ways are different.

For Android TV models (Mi TV 4S, Q2, A2 and later):

1. Open Settings → Display and sound → Additional settings.
2. Select Screen Size (or HDMI Scaling for external devices).
3. Move the horizontal and vertical scale sliders until the image fits into the screen.
4. Save the settings and check the result on different signal sources.

For models with PatchWall (Redmi Smart TV, Mi TV 4A/4X):

There are no sliders, but there is a hidden option: press the Menu button on the remote for 5 seconds, then enter the code:

963258

After that, the Engineer Mode menu will appear.

Engineer Mode → Picture → Overscan Setting

Set 0 to turn off the trim or 100 to zoom in as much as possible. Be careful: changes to the engineering menu can reset other TV settings!

⚠️ Attention: On Xiaomi models TV Q1E and Q2 2023 manual scale setting blocked for resolution signals 4K@120Hz. This is a firmware restriction – it can only be circumvented through an external device (for example, by setting the output). 4K@60Hz prefixed).

3. Scaling up the scale for HDMI-devices (consoles, consoles, PCs)

If the problem only manifests itself when connected via HDMI, it could be the fault of both the TV and the external device.

If the problem persists after the changes to the external device, go back to the settings of the TV. TV 9.0+ There is a separate menu for each HDMI-port:

Settings → Devices and accessories → HDMI- Entry → [Select port] → Image format

You can force 16:9, 4:3 or Original (no processing). For game consoles, you should choose Game Mode, which will reduce the input delay and disable unnecessary zoom.

💡

If you connect your PC via HDMI, try using screen duplication mode instead of extension. In Windows, this is done via Win + P → Duplicate.

4.Scale problems when watching TV (antenna, cable TV)

Black stripes or stretched images when watching on-air or cable TV are usually associated with the broadcast format. Many channels are broadcast at 4:3 or 14:9, and the TV automatically stretches the picture to 16:9.

1. Open Settings → Channels → TV image settings.
2. Select the screen format and set the original (or 4:3 for old channels).
3. If the image is too small, turn on the Pan and Scan option – this will trim the edges but fill the entire screen.

Some Xiaomi models (e.g. Mi TV 4A 32) have a bug: when switching between DVB-T2 (antenna) and IPTV, the scale settings are reset.

Turn off automatic format determination | Set a fixed aspect ratio (16:9) | Update the channel list manually |Reset the tuner settings to the factory ones

-->

If the black lines only appear on individual channels, check their actual format via RTRS (for Russia), for example, Match TV or Carousel channels are often broadcast at 14:9, which causes distortions.

5. Update firmware and reset settings

If none of these things worked, it could be an outdated firmware or a configuration failure.

1. Go to Settings → About TV → System Update.
2. Click Check Updates and wait until the end (the TV will restart automatically).
3. After updating, check the scale - in new versions of the software, bugs with overscan are often fixed.

If the update didn’t help, reset your image settings (not to be confused with a full reset of your TV!):

Settings → Display and sound → Resetting image settings → Confirm

This will return factory brightness, contrast and scale, but will not affect installed applications or accounts. On PatchWall models, after reset, you may need to reconfigure the signal sources (HDMI, TV-tuner).

⚠️ Note: On Xiaomi TVs with firmware older than 2021 (e.g. Mi) TV 4S 55" 2019) after the update may disappear item Screen size in the menu. This is a bug that is corrected only by rolling back to the previous version of the software or manual firmware through the USB.

💡

Before resetting the settings, write down the current brightness / contrast parameters - after resetting, they will have to be adjusted again.

6. Hidden functions and engineering menu

If the standard methods don't work, we have the engineering menu, the deep-tuning tool for the TV, hidden from the general public. Careful: the wrong changes can cause the failures! We've put together some safe options related to scale:

• 🔧 HDMI Scaling – manual trimming adjustment for each port (values from 0 to 100).
• 📏 Aspect Ratio – Forced aspect ratio (including rare formats like 21:9).
• 🖥️ PC Mode – Optimization for a signal from the computer (disables image processing).
• 🔄 Reset Picture – reset all image parameters to factory.

To get into the engineering menu:

1. On the remote, press sequentially: Menu → Up. → Up. → Down. → Down. → Left. → Right. → Left. → Right (like the Contra code).
2. Use the universal code: 981 + Menu (hold 3 seconds).
3. From the menu, select Picture → Advanced and look for options related to Scaling or Overscan.

On Android models TV 10+ (for example, Xiaomi TV Q2 2023) Engineering menu blocked. Alternative is to use ADB-Connect the TV over Wi-Fi (turn on Debugging on the computer). USB In the developer settings) and execute:

adb shell settings put global overscan_custom 0


adb shell settings put global overscan_custom_enable 1

This will turn off the edge trimming at the system level.

7. Hardware restrictions and when to contact the service

If you have tried all the methods, but the problem remains, hardware malfunctions are possible:

• 🔌 Damaged. HDMI-port -- check the cable and port on the external device. Try another connector on the TV.
• 📺 Faulty matrix – if the image is distorted even in the TV menu (without external sources), this is a sign of a screen breakdown.
• 🔄 Failure of the main board is rare, but it happens that the video processing chip fails (usually after a voltage jump).

Before visiting the service center, do the following:

1. Take a picture of the problem on your phone’s camera (capture the TV menu and distorted image).
2. Check the TV on another signal source (e.g., plug in a Fire TV Stick or laptop).
3. Check with Xiaomi support if your problem is a warranty case.

⚠️ Note: On Xiaomi TVs with OLED-screens (series) OLED Vision) Continuous use of incorrect scale (e.g. stretching 4:3 to 16:9) can cause pixel burnout!

FAQ: Frequent questions about scale on Xiaomi TV