Modern smartphones such as Xiaomi Redmi 9T, have powerful screens and processors, but sometimes the 6.53-inch diagonal is not enough to view content. Wireless connection Connecting your big-screen TV to a TV is the perfect way to transform your gadget into a multimedia center for the whole family. No longer do you have to huddle around a small display to show friends vacation photos or play a mobile game.
Wireless data transmission technologies allow for high-definition image streaming without the need for unnecessary wires. Owners of devices based on Android have several proven tools for implementing this task, built right into the shell MIUIWe'll cover all available methods, from the standard "Broadcast" feature to using third-party apps and protocols. DLNA.
It is important to understand that the quality of the connection directly depends on the stability of your home network. Wi-FiBefore starting setup, make sure the router is working properly and both devices are within a strong signal range. In this article, we'll detail the synchronization process, troubleshoot potential errors, and answer frequently asked questions.
Equipment preparation and compatibility testing
The first step is to ensure physical connectivity. To ensure successful operation, you will need a TV that supports the technology. Smart TVThese could be models from Samsung, LG, Sony, or even Android TV boxes. If you have a regular TV but a set-top box is connected to it (for example, MI Box or Chromecast), the method will also work.
A critical condition is that both devices are located on the same local network. Router It must transmit a signal on a frequency supported by both devices. Problems often arise when the phone is connected to a 5 GHz network, but the TV only sees 2.4 GHz, although modern routers often combine these networks into one.
⚠️ Important: If your router broadcasts two different networks with the same name (e.g., Home and Home_5G), make sure both the Redmi 9T and TV are connected to the same network. Different subnets can block device detection.
Check the operating system version on your smartphone. Redmi 9T runs under control Android with shell MIUI, where streaming features are built in by default. However, if the software hasn't been updated recently, security protocol conflicts may arise.
Miracast Method: Built-in Casting Function
The most common way to mirror your screen on devices Xiaomi is called "Broadcast" (or Cast). This method is based on the protocol Miracast, which allows you to transmit video and audio directly to a compatible receiver. No additional cables or complex IP address settings are required.
To get started, unlock your Redmi 9T and pull down the notification shade. Find the "Broadcast" icon (sometimes it's hidden in the second menu, swipe right). If you don't see the icon, go to Settings → Connection and Sharing → BroadcastThe system will automatically begin searching for available devices within the network range.
You also need to activate the receiving mode on your TV. This may be called "Screen Mirroring," "Cast," "Miracast," or "Smart View" in the Smart TV menu. Once the TV is visible, its name will appear in the list on your smartphone screen.
☑️ Check before connection
After selecting your TV from the list, a connection confirmation may appear on your smartphone screen. Use your TV remote control to press "Allow" or "Accept." Your phone's image will immediately appear on the big screen.
Using Google Home and Chromecast
If your TV has built-in support Chromecast or if the corresponding set-top box is connected to it, the best choice would be to use the ecosystem GoogleThis method often provides a more stable connection and better picture quality than Miracast, especially when streaming video from the internet.
To work you will need an application Google Home, which can be downloaded from Play MarketAfter installation, open the app and find your device in the list of available devices. Make sure your account is Google on the phone matches what is used on the TV (if authorization is required).
In the app interface, tap your TV icon and then select the "Cast my screen" button. The system will warn you that the audio and video will be transmitted to the external device. Confirm the action, and the screen will Redmi 9T will be projected on TV.
| Parameter | Miracast | Chromecast (Google Home) | DLNA |
|---|---|---|---|
| Transmission type | Screen mirroring | Dubbing or streaming | Media files only |
| Latency | Medium/High | Low (when streaming) | Absent |
| Battery consumption | High | Average | Short |
| Internet | Not required (locally) | Desirable | Not required |
The advantage of the method Chromecast The advantage is that the phone can be used for other tasks while video is streaming to the TV (in supported apps). This protocol also adapts better to changes in network quality, reducing resolution on the fly to avoid tearing.
Broadcasting via YouTube and other apps
Often, users don't need to mirror the entire screen, but only want to show a specific video or movie. In this case, it's most effective to use the built-in casting feature in the apps themselves, such as YouTube, Netflix or VK VideoThis takes the load off the phone's processor.
Open the app YouTube on Redmi 9T and start the desired video. At the top of the video player, look for the rectangle icon with waves (broadcast). Click it and select your TV from the list. The video will begin playing on your TV, controlled from your phone.
This method uses the protocol DLNA or proprietary algorithms Google, transmitting a link to the video stream directly to the TV. In this case, the phone only acts as a remote control. The image quality will be the highest supported by your internet plan and router.
⚠️ Note: To stream via apps (YouTube, Netflix), your TV and phone must be logged into the same Google account or be on the same network, but direct internet access via a router is required.
If the casting icon doesn't appear, check for app updates. Sometimes older versions of apps can't correctly detect new TV models. Also, make sure the appropriate app (such as YouTube on TV) is running on your TV.
Why does the video lag when broadcasting?
Lag or buffering is often caused by Wi-Fi congestion. If your router is simultaneously sharing internet with multiple devices downloading files, the bandwidth may not be sufficient for streaming 4K video. Try disconnecting other devices or reducing the video quality in your player settings.
Solving common connection problems
Despite the simplicity of the technology, users Redmi 9T You may encounter difficulties. The most common issue is that the TV isn't listed as an available device. In 90% of cases, this is due to router settings that isolate devices from each other (AP Isolation). Go to your router settings and disable this feature.
Another reason could be an outdated Wi-Fi module driver or a software glitch in the shell. MIUITry restarting both devices: unplug the TV for 10 seconds and restart your smartphone. This clears the network service cache.
If the image is transmitted but there is no sound, check the audio output settings. On some TVs, the audio defaults to the phone. Press the volume button on the phone and select the external device (speaker icon).
- 📡 Weak signal: Move closer to the router; walls and furniture may block the signal.
- 🔄 Version conflict: Update the Google Play Services app through the Play Market.
- 🔋 Energy saving: Disable battery saving mode on Redmi 9T, it may limit Wi-Fi performance.
In rare cases, the problem lies with your antivirus software or firewall installed on your router. Try temporarily disabling traffic filtering. Also, make sure the date and time on your phone and TV are automatically synced, as desyncing can block secure connections.
Alternative methods and third-party applications
If standard methods don't work, third-party solutions come to the rescue Google PlayApplications like Web Video Caster or TV Cast can detect almost any Smart TV, even if it does not support standard protocols XiaomiThey install their server on the phone and stream content through the TV browser.
For advanced users, a connection method is available via ADB (Android Debug Bridge), but it requires enabling USB debugging and installing the server component on the TV. This allows you to control the TV from your phone with minimal latency, which is useful for gaming.
It's also worth mentioning the use of a USB-C to HDMI cable if your Redmi 9T supports video output (although in this model, USB video output is often limited or absent, requiring wireless methods or special adapters with DisplayLink support). In the case of the Redmi 9T, it's better to rely on Wi-Fi Direct.
⚠️ Note: Menu interfaces and item names in MIUI may differ depending on the firmware version (Global, EU, Russia). If you don't find the "Cast" option, search for "Cast" or "Cast" in the settings.
Using third-party apps may result in ads or reduced image quality, but they are a great backup option. Always check the permissions an app requests to avoid unnecessary access to personal data.
Frequently Asked Questions (FAQ)
Does connecting to a TV affect internet speed?
Yes, streaming video, especially in high definition (1080p or 4K), consumes a significant portion of your Wi-Fi bandwidth. If your Wi-Fi connection is limited, internet speeds on other devices may decrease.
Is it possible to turn off the phone screen while broadcasting?
When using Miracast (screen mirroring), the phone's screen must be lit, otherwise the stream will be interrupted. When streaming via YouTube or Google Home, the screen can be turned off, and the video will continue to play on the TV.
Why is the picture not full screen (black bars)?
This is due to the different aspect ratios of phone and TV screens. TVs typically have a 16:9 aspect ratio, while phones are more elongated. You can try changing the scaling mode (Zoom or Wide Fit) in your TV settings.
Is it safe to connect to public Wi-Fi to stream?
No, public networks (cafes, airports) often have client isolation enabled, making it impossible to detect the TV. Furthermore, data transmission on open networks is less secure.