Modern smartphones such as Xiaomi Redmi 9, have become powerful multimedia centers capable of playing high-definition content. However, the small screen of a mobile device is often insufficient for comfortable viewing of movies, photos, or presentations with the family. Wireless connection technology via Wi-Fi solves this problem by allowing you to transmit images without unnecessary wires.
Synchronization process Android-devices and TVs may seem complicated only at first glance. In fact, the operating system MIUIThe Redmi 9 has built-in screen mirroring tools that don't require third-party software. In this article, we'll cover all available methods, from native features to third-party apps, so you can choose the best option for your TV model.
The main advantage of a wireless connection is freedom of movement. You can use your phone for calls or texting while the video is streamed to a large screen, or simply control playback from the comfort of your couch. The only important thing is to ensure a stable connection and proper configuration of both devices on the same local network.
Preparing equipment and a Wi-Fi network
Before you begin setup, you need to make sure both devices are ready to communicate. Proper local network configuration is the foundation for a successful connection. Xiaomi Redmi 9 and the TV must be connected to the same routerIf you have a dual-band router that supports both 2.4 GHz and 5 GHz frequencies, it's best to have both devices operate in the same band, although modern routers often automatically route traffic correctly.
Check your smartphone's operating system version. For stable streaming functionality, it's recommended to use the latest version. MIUIUpdates often contain security fixes and improve compatibility with various Smart TV models. Go to Settings and check for updates to rule out software conflicts.
⚠️ Attention: If your router is configured for AP Isolation, your phone won't see your TV. This feature is often enabled on guest Wi-Fi networks. Make sure you're connected to your main home network, not the guest network.
It's also worth paying attention to battery life. Wireless video streaming consumes a significant amount of power. For long viewing sessions, it is recommended to connect the Redmi 9 to a charger.to avoid sudden disconnections mid-movie. Signal stability also depends on the distance from the router: too far away can cause audio and video to become out of sync.
Some older TV models may not support modern Wi-Fi encryption standards. If you're using a very old router, try changing the security type in your router settings to mixed mode (WPA/WPA2), although this may reduce overall network security. For most modern users, the default settings from your ISP are sufficient.
Using the built-in Mi Cast function
The easiest and fastest way to connect Xiaomi Redmi 9 to TV - use system function Mi Cast (in some firmware versions it is called "Broadcast" or "Wireless Monitor"). This method is based on the protocol Miracast, which is supported by most modern Smart TVs without the need to install additional applications on the TV.
To activate the feature, pull down the notification shade and find the "Cast" icon. If it's not on the main screen, tap the panel editing button (usually three dots or a pencil icon) and drag the icon to the active area. After tapping, the phone will begin searching for available devices on the network. This process can take 5 to 15 seconds.
When your TV's name appears in the list, tap it. A confirmation prompt may appear on the TV screen—use your remote to confirm. After this, your smartphone's screen will be mirrored on the TV. In this mode, your phone acts as a second screen, and everything you do on it is displayed on a large panel.
- 📺 Open the Control Center and select "Cast".
- 🔍 Wait until the system finds your TV in the list.
- ✅ Click on the device name to start synchronization.
It's important to note that when using Mi Cast, your phone's screen must be on. If you lock your phone or the screen goes dark, the streaming will stop. This distinguishes this method from "smart" video streaming, where the phone acts only as a remote control and the TV downloads content directly from the internet.
Streaming via Google Home (Chromecast built-in)
If your TV is based on Android TV or has built-in support for the technology Google Cast (Chromecast), the best solution is to use the official app Google HomeThis method ensures more stable content transmission and allows you to use your phone as a remote control without draining its battery to decode the video stream.
To get started, make sure you have the app installed on your Redmi 9 Google HomeIt's often pre-installed, but if not, you can download it for free from the store. Google PlayOpen the app and sign in to your Google account. The system will automatically scan the network and find available Chromecast devices or Cast-enabled TVs.
Unlike Mi Cast, you can stream specific content from apps. For example, after playing a YouTube video or a movie in an online cinema, tap the cast icon (the rectangle with waves) in the corner of the player. Select your TV, and the video will open on it, leaving you free to use your phone for other tasks or even turn off the screen.
⚠️ Attention: Apps must be authorized under the same Google account on both your phone and TV (if a subscription is required) to ensure content streams and plays correctly without licensing errors.
The advantage of this method is that it supports 4K and HDR if your TV and internet plan allow it. Xiaomi Redmi 9 It effectively functions as a controller, sending only control commands rather than a heavy video stream. This reduces the load on the Wi-Fi channel and minimizes lag.
☑️ Google Home Pre-Launch Check
Connecting to Samsung, LG, and Sony TVs
Owners of TVs from different manufacturers may encounter nuances, as each brand uses its own technologies. Samsung (Tizen system) and LG (WebOS system) Standard Miracast may be unstable or require enabling the feature in the TV's settings. This option is often called "Screen Share" on LG TVs or "Smart View" on Samsung TVs.
For Sony For other Android TVs, the situation is simpler—they're often visible in the standard Redmi 9 casting menu. However, if the automatic search doesn't yield results, it's worth using proprietary apps. For example, there's an app for LG. LG TV Plus, and for Samsung - SmartThingsThese programs not only allow you to mirror your screen, but also control your TV and transfer photos and music.
Let's look at the differences in protocol support between different brands:
| Brand TV | Basic protocol | Recommended app | Peculiarities |
|---|---|---|---|
| Samsung | AirPlay 2 / Miracast | SmartThings | TV confirmation required |
| LG | Miracast | LG TV Plus | Screen Share function in the menu |
| Sony | Chromecast / Miracast | Video & TV SideView | High stability |
| Xiaomi / Mi TV | Mi Cast / Miracast | Not required | Perfect compatibility |
If you are using a TV without Smart TV, but with an HDMI port, you can purchase a special adapter (such as a Chromecast or Miracast dongle) that connects to the HDMI input and creates an access point for your Xiaomi Redmi 9This will turn any old HDMI TV into a smart device.
What if the TV is not on the list?
Make sure the appropriate signal receiving app (such as Miracast or Screen Share) is open on your TV. On some LG and Samsung models, you may need to manually initiate connection standby mode in the Source menu.
Alternative streaming apps
When standard methods don't work or require advanced functionality, third-party apps come to the rescue. One of the most popular and reliable solutions is the app Web Video Caster or Cast to TVThese programs can extract video streams from browsers and applications that don't officially support Chromecast and send them to your TV.
These apps work simply: you open a video site in the app's built-in browser, select a streaming format (DLNA, Chromecast, AirPlay), and start playback. The app analyzes the stream and redirects the link to your TV. This is the ideal way to watch videos from various online cinemas that block standard screen casting.
- 📲 Web Video Caster: A powerful tool for broadcasting from the browser.
- 🖥️ AllCast: Allows you to transfer photos, music and videos from your gallery.
- 🎮 LocalCast: Supports subtitles and various audio codecs.
It's worth keeping in mind that free versions of such apps may contain ads. Permanent, unlimited use often requires purchasing a premium version. However, one-time activations of the free version's functionality Xiaomi Redmi 9 quite enough.
Another option is to use a media center Kodi, if it's installed on a TV or set-top box. In this case, the phone can act as a remote control or file source via the SMB/UPnP protocol, allowing files to be opened directly from the smartphone's memory on the TV over the network.
Troubleshooting and FAQ
Even with proper setup, technical difficulties can still arise. Users often experience audio and video out of sync. This usually indicates a congested Wi-Fi channel or low internet speed. In this case, try closing background apps on your phone that may be consuming data or restarting your router.
If the image is choppy or has low resolution, check your display settings. On the Redmi 9, there are often quality settings in the "Broadcast" section. Also, make sure you're not too far from the router. Walls and ceilings can significantly weaken the signal, especially at 5 GHz, which, while faster, penetrates obstacles less effectively.
⚠️ Attention: MIUI interfaces and TV settings are subject to update. Button locations and menu item names may vary depending on the firmware version. If you don't find the feature described, try searching through your phone's settings.
In some cases, antivirus software or a firewall on your router may be blocking the connection between devices. Try temporarily disabling protection or adding devices to your trusted list. Also, make sure the date and time on your phone and TV are synchronized, as this affects the security certificates.
Why doesn't my phone see my TV in the list of available devices?
Most often, the problem lies in the devices being connected to different networks (for example, one to a guest network, the other to the main network) or to different frequency bands, which are isolated by the router. Also, check that "Invisible Mode" isn't enabled in your TV's streaming settings. Sometimes, rebooting both devices and the router helps.
Is it possible to display a screen if there is no internet, only a local network?
Yes, Miracast and DLNA technologies don't require internet access; the router simply needs to create a local network to which both devices are connected. Some routers even allow you to create such a network without connecting to a provider. However, streaming content from online services (YouTube, Netflix) does require internet access.
Does phone connection affect internet speed?
When using the smart casting method (Google Cast), where the phone serves as a remote control, the network load is minimal. However, when using screen mirroring (Mi Cast), where the phone encodes and transmits the video stream in real time, data consumption and Wi-Fi load increase significantly, which can slow down other devices on the network.
Will there be a delay in sound when connected via Wi-Fi?
A small amount of latency is normal for wireless technologies. It's rarely noticeable when watching movies, as buffering smooths out jerkiness. However, when gaming or using the TV as a monitor, latency can be noticeable (from 100 ms to several seconds). For gaming, it's best to use a wired connection or low-latency game modes, if supported.
How do I turn off the broadcast?
To end the connection, simply open the "Cast" menu on your Redmi 9 and tap "Disconnect" or select "Stop." You can also simply lock your phone's screen (if using Mi Cast) or tap "Stop" in the app you were casting with. Switching the source on your TV remote will also disconnect.