Modern smartphones like the Xiaomi Redmi 9 have powerful screens and processors that allow you to play high-resolution content. However, a diagonal of 6.53 inches may not be enough to comfortably view movies, photos or presentations, and it is in such situations that you need to display the image on the big screen of the TV.
The process of syncing devices has become much easier with the introduction of wireless technology. You do not need complex cables or adapters if both gadgets support Wi-Fi Direct or Miracast standards. In this article, we will discuss in detail all the available ways of connecting so that you can enjoy content on a full screen without unnecessary fuss.
It is worth noting that the quality of data transfer is directly dependent on the stability of your home network. Before setting up, make sure that the router is running correctly, and both devices are in the zone of confident reception of the signal, this will avoid dissynchronization of sound and image during use.
Technical requirements and equipment preparation
Before you start active pairing actions, you need to make sure that the equipment is compatible. Xiaomi Redmi 9 is equipped with a Wi-Fi module standard 802.11 a/b/g/n/ac, which provides sufficient bandwidth for streaming video to HD and even 4K. However, the smartphone itself is only a signal source.
The second key element is your TV. Modern smart models. TV They have Miracast receivers built in or support for Google Chromecast technology, but if you have an older model, you will need to use additional adapters, such as: HDMI-Android whistles TV. Without receiving the signal over Wi-Fi Direct wireless transmission will be impossible.
Most methods require that both devices be on the same local network, which means that the phone and TV must be connected to the same router, and that using the mobile Internet on a smartphone with a TV connected to the cable will prevent the devices from seeing each other.
- 📱 Xiaomi Redmi 9 with a battery charge of at least 20%.
- 📺 TV with Smart Support TV or external receiver.
- 📡 Stable Wi-Fi connection 2.4 GHz or 5 GHz.
- 🔌 Up-to-date version of the firmware MIUI for the correct operation of system services.
⚠️ Note: If your router is giving away two networks with the same name (2.4 GHz and 5 GHz), make sure both devices are connected to one of them, as some older TVs don’t see the device in different frequency bands.
Use of the built-in Translation function in MIUI
The MIUI shell on Redmi 9 has native wireless image output support, which is based on the Miracast protocol and doesn't require any additional software to activate it, lower the notification curtain down and find the Translation icon. If it's not on the home screen, click on the edit pencil and add a widget from the hidden list.
Once the feature is enabled, the system will automatically search for available devices within range. On the TV screen, you may also need to run the Screen Mirroring, Wireless Display or similar app, depending on your TV brand.
As soon as your TV name appears on the list, tap it. The TV screen may pop up with a request for confirmation of connection, which you need to accept by the remote, then the image from the phone is completely copied to the big screen, you can switch between applications, and the picture will be broadcast in real time.
It is important to understand that when using this method, the smartphone screen will burn constantly, which can lead to accelerated battery discharge, and it is also worth considering that the resolution of the broadcast image adapts to the capabilities of the TV, not the phone.
Broadcasting via Google Home and Chromecast
If the built-in MIUI feature doesn't find the TV or is unstable, the best solution is to use the Google ecosystem. Virtually all modern TVs have Chromecast support, or it is implemented through the console. To get started, you will need the Google Home app, which can be downloaded from the Play Market.
Once you install the app, open it and make sure you are logged in to your Google account. The program will automatically scan the network and find available devices. If your TV appears in the list, click on it. From the control menu that opens, select Translate screen or Cast my screen.
This method often provides a more stable connection and better optimization for video content from YouTube, Netflix and other services. Unlike Miracast, it uses stream coding, which reduces the strain on the phone's processor when watching online video.
What to do if the “Translate” button is not active?
- 🌐 Open the Google Home app on Redmi 9.
- 📺 Select your TV from the list of devices.
- ▶️ Click on “Translate screen” to mirror the interface.
- 🛑 To stop, click the “Stop broadcast” button in the app.
⚠️ Note: When streaming through Google Home, image quality can change dynamically depending on internet speed, as some of the data can be buffered through Google’s cloud servers.
Third-party applications for complex cases
Sometimes standard means are powerless, especially if the TV is not a smart model, but has a smart TV. USB-port and network connection, or if protocols are blocked by router settings, and in these cases, specialized intermediary applications come to the rescue. TV Cast or Web Video Caster.
The principle of their operation is that the application runs a local server on the phone and transmits a link to a media file or video stream directly to the browser or receiver of the TV, which allows you to stream video from browsers where the built-in Cast button is missing. You just copy the link to the video to the application, and it sends a command to the TV.
Another option is to use remote desktop applications like TeamViewer or AnyDesk if you want to show the phone interface, but this method is not suitable for watching videos due to low frame rates and delays. For multimedia, it is better to use specialized players, such as VLC for Android, which has a built-in Rendering feature.
💡
To transfer heavy video files from your phone to your TV without compression, use the Neighborhood Devices feature in the MIUI file manager if your TV supports DLNA/SMB.
When choosing third-party software, pay attention to the presence of advertising, as free versions are often oversaturated with banners. Paid versions usually offer more stable connect and support for high-resolution codecs.
Wired connection via USB-C to HDMI
For users who are critically important to the stability of the connection and the absence of any delays (for example, when playing games or showing presentations), there is a wired method. However, there is an important technical nuance that concerns the Xiaomi Redmi 9 model. This smartphone is equipped with a USB Type-C 2.0 port, which, unfortunately, does not support the transmission of video directly through the adapter.
This means that the simple USB-C HDMI adapters running on DisplayPort Alt Mode technology will not work with the Redmi 9. The screen will remain black, because the power and data controller in the phone can not convert the signal to HDMI without the help of the processor. Many users make the mistake of buying cheap adapters without checking the specifications.
The only way to get a wired image with Redmi 9 is to use special adapters that connect through the debugging port and require the installation of drivers, or use image compression technologies, but they are extremely rare and expensive, so for owners of this model, wireless is the only true and working solution.
| Connection method | Delay (Latency) | Quality. | Battery consumption |
|---|---|---|---|
| Miracast (Translation) | Low. | High. | High-pitched |
| Google Chromecast | Medium | Adaptive. | Medium. |
| DLNA (Media Only) | Absent. | Original | Low. |
| Wireless (not supported) | No. | No. | No. |
So, you don't have to spend money on cables for Redmi 9 in the hope of wired image output, but you'd better invest in a good router that supports 802.11ac, which will dramatically improve wireless quality.
Solving common problems and errors
Even when set up correctly, there can be situations where devices can’t see each other or the connection is constantly interrupted, most often the problem lies in the MIUI energy saving settings. The system can aggressively “kill” background processes, considering the broadcast service as an unnecessary waste of resources.
To fix this, go to Settings → Battery and Performance. Find Translation or Wireless Display in your application list and set Unlimited mode, which will prevent the system from turning off the Wi-Fi module to transfer data while the screen is sleeping or other applications are running.
Another common cause is a crowded Wi-Fi channel. If neighbors have powerful routers on the same channel, there may be interference, try restarting the router so that it automatically selects a less loaded channel, or manually switch the frequency in the router settings.
☑️ Diagnostics of connection
If nothing helps, try to temporarily disconnect. VPN-services or antiviruses on a smartphone, as they can block local network interaction, considering it suspicious activity.
Optimizing the quality of image and sound
To achieve the best visual experience, it is important to adjust the output settings correctly. Resolution settings are sometimes available on the Translation menu on Redmi 9. If you see a picture twitching, try reducing the quality from 1080p to 720p. This will reduce the load on the Wi-Fi channel and make the picture smoother.
Sound deserves special attention. When broadcasting the screen, audio is also transmitted to the TV. If the sound wheezes or lags behind the video, check the Bluetooth settings. Sometimes the phone tries to transmit the sound to the connected wireless headphones, ignoring the TV, or vice versa. In the Settings menu → Sound and vibration → Output, you can force the target device to be selected.
💡
The broadcast stability is 90% dependent on the quality of the Wi-Fi signal, not the power of the smartphone, so place the router closer to the viewing area.
And it's also worth mentioning vertical and horizontal. Automatically rotating the screen on Redmi 9 works well, but on TV, the image can be displayed with black stripes on the sides in portrait mode. That's fine, because the TV format is designed for landscape video.
⚠️ Warning: Do not try to play dynamic shooters via wireless streaming.Input lag can be anywhere from 100 to 300 ms, making the game uncomfortable and can cause motion sickness.