The modern smartphone has long ceased to be just a means of communication, becoming a powerful multimedia center, which we carry everywhere. However, even in top models, the diagonal is limited by the physical frame of the case, and often there is an urgent need to bring the image to the big screen of the TV or monitor. For owners of budget and mid-budget devices such as the Xiaomi Redmi Note 9, this issue is especially relevant, since not everyone is aware of the hidden capabilities of their operating system. The wireless video stream is built into the MIUI shell, but its activation and stable operation depend on many factors, which we will consider in detail.
The broadcast technology, also known as Miracast or Translation, allows you to duplicate the contents of the display of a smartphone to any compatible device without the use of wires. This opens up opportunities to view family vacation photos on a big TV, run mobile games on a wide screen, or give presentations in the office.In the case of the Redmi Note 9, equipped with a MediaTek Helio processor. G85, The hardware capabilities allow you to transfer the video stream to HD-without significant delay, provided certain network conditions are met.
In this article, we’ll look at not only standard connectivity methods, but also alternative ways that can come in handy if the built-in features aren’t working properly. You’ll learn how to set up a local network for maximum data transfer speed, what apps to install from Google Play to expand functionality, and how to avoid common pairing errors. Understanding the principles of data protocols will help you use your Xiaomi smartphone at full capacity.
Preparing a smartphone and TV for the connection
Before trying to sync devices, make sure both gadgets are in the same network environment.It is critical that both the Redmi Note 9 and your TV (or TV set-top box) are connected to the same Wi-Fi network. If your router supports dual-band (2.4 GHz and 5 GHz), it is highly recommended to use the 5 GHz band for both devices, as it provides the higher bandwidth required for video streaming.
On the TV side, you also need to activate the signal reception mode. In modern Smart TVs from Samsung, LG, Sony or Philips, this feature is often built-in by default and can be called Screen Mirroring, Smart View, or simply Translation. You need to find the corresponding application in the TV app menu and run it so that the device goes into standby mode. Without this step, the phone simply “will not see” the target screen in the list of available devices.
Check also the power saving settings on your Xiaomi Redmi Note 9. Aggressive battery optimization can block background processes needed to maintain a stable connection. It is recommended to temporarily turn off the power saving mode or add the Translation app to the exclusion list.
☑️ Checking before connection
Built-in Translation function in MIUI
The MIUI shell installed on the Redmi Note 9 offers a native image output tool that doesn’t require additional software. To activate it, open the control panel (curtain) and find an icon called Translation. If the icon is hidden, click on a pencil or edit button in the corner of the curtain and drag the icon to the visible area. An alternative path lies through the settings menu: go to Settings → Connection and Sharing → Broadcast.
Once the feature is turned on, the phone will start searching for available devices within range of the network. The scanning process can take 5 to 15 seconds. Once your TV appears on the list, tap its name. A request for permission to connect may appear on the TV screen — it must be confirmed by the remote control. From that moment, the image from the phone will begin to be broadcast to the large screen.
It is worth noting that the quality of the image depends on the loading of the wireless channel. If you notice artifacts or audio delay, try to close the background applications on your smartphone that actively use the Internet. Also, the broadcast menu on some versions of MIUI has resolution and frame rate settings that can be lowered to improve the stability of the connection.
Using Google Chromecast technology
If your TV doesn’t support Miracast but has a built-in Chromecast or an Android TV set-top box attached to it, you can use an alternative method. Chromecast works differently: it doesn’t stream the entire screen of your smartphone, but specific content from apps (YouTube, Netflix, Spotify), which often gives better quality and less load on the Redmi Note 9 battery.
To use this technology, make sure your phone has Google Play services installed (which is the default on global Xiaomi versions). Open the app you want to watch, such as YouTube. Find the broadcast icon (rectangle with waves in the corner) at the top of the app interface. Click on it and select your TV from the list.
Unlike mirroring, here the phone acts as a remote control, so you can turn the app down, you can answer messages, you can turn off the screen of your smartphone, and the video on the TV will continue to play, and this is especially useful when you need to answer a call urgently without interrupting the movie for the whole family.
⚠️ Note: When using Chromecast, only the content of a particular app is broadcast. If you try to display a desktop or game that does not support Cast, the image on the TV may not appear or will be black.
Broadcasting through third-party applications
In situations where Xiaomi’s regular funds are not coping or the TV belongs to the old generation, specialized applications from Google Play come to the rescue. TV Cast. These programs can send video files and streaming videos directly to the TV browser or through the TV browser. DLNA-protocol.
Another powerful tool is the ApowerMirror or LetsView app, which not only broadcasts an image, but also controls your phone from a computer or TV (with appropriate support on the TV side (APK-file) directly to the TV, if it runs on Android TV.
Third-party solutions have the advantage of being flexible: they often have built-in codecs, support more video formats, and can play audio even when the system stream is silent, but be prepared for free advertising and possible performance loss due to the resource intensity of third-party software.
Why can third-party apps work better?
Wired connection via USB-C to HDMI
For owners of Xiaomi Redmi Note 9, it is important to know one technical nuance: the USB Type-C connector in this model complies with the USB 2.0 standard and does not support video output through the port (MHL or SlimPort technologies), which means that simply connecting a USB-C cable to HDMI will not work – the screen will remain black.
But there is a workaround using adapters that use DisplayLink technology, which requires a driver to be installed on the phone and uses the smartphone's processor to encode the image into a USB-based video stream, which allows you to get a stable picture even without Wi-Fi, but requires you to buy a specific and often expensive adapter.
If you need a wired connection for low latency games, consider buying an adapter with a DisplayLink chip. Otherwise, wireless methods for the Redmi Note 9 are a more rational and economical choice.
| Method | Delay (Latency) | Quality. | Difficulty |
|---|---|---|---|
| Miracast (Integrated) | Medium | High. | Low. |
| Google Chromecast | Low (for video) | Maximum. | Low. |
| Third-party annexes | Tall. | Average. | Medium |
| DisplayLink (Cable) | Low. | High. | Tall. |
Solving problems and troubleshooting
Even if you follow all the instructions, users can face problems: the phone does not see the TV, the image twitches or there is no sound. Most often the reason lies in the router settings. AP» (AP Isolation, which prevents devices within the network from communicating with each other.
Another common problem is desynchronizing audio and video. This is treated by rebooting both devices and the router. Also check if the phone is not in Do Not Disturb mode, which in some MIUI configurations can block audio streaming when broadcasting. If nothing helps, try resetting the network settings on the phone through the Settings menu → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth.
If you use a stream for gaming, pay attention to the heating of the case. Long-term transmission of high-resolution video stream puts a strain on the processor and the Wi-Fi module of the Redmi Note 9. Remove the protective case for better cooling and close the unnecessary applications.
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To reduce latency when playing, try prioritizing your smartphone traffic (QoS) in your router settings if your hardware supports this capability.
⚠️ Note: If you connect through Miracast, the image appears, but immediately goes out, check the screen resolution. Try temporarily changing the resolution in the phone settings to the standard one. 1280x720 pre-broadcast.
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The stability of the broadcast depends on the quality of the Wi-Fi signal and the absence of interference in the air, not only on the power of the smartphone.