Modern smartphones such as Xiaomi Redmi 9While TVs have powerful screens, viewing high-definition content often requires a larger TV display. Fortunately, wireless data transmission technology allows you to stream content wirelessly, using only your home Wi-Fi network. This solution is ideal for watching movies, presentations, or photos on a larger screen.
The process of synchronizing a gadget and a TV may seem complicated only at first glance. In fact, the operating system MIUI It has built-in tools for quick connection. You don't need advanced technical knowledge to set up a broadcast in minutes.
In this article, we'll take a detailed look at all available connection methods, from standard system functions to specialized apps. You'll learn how to avoid image lag and maximize connection stability on your home network.
Preparing equipment and a Wi-Fi network
Before you start setting up your broadcast, you need to make sure that all devices are ready to work. Fundamental condition A successful connection requires the smartphone and TV to be on the same local network. If your router broadcasts signals on both 2.4 GHz and 5 GHz frequencies, make sure both devices are connected to the same frequency, although modern routers often combine them into a single network.
The quality of the transmitted signal directly affects the smoothness of the video. To transmit content in the resolution 1080p A stable connection is required. A weak signal can lead to audio and video desynchronization or artifacts.
⚠️ Note: If your router is installed far from the viewing area, streaming quality may be significantly reduced. In such cases, it is recommended to move the access point closer or use a Wi-Fi repeater.
Please also check the software version on your Redmi 9Manufacturers regularly release updates that fix data transfer protocol errors. Go to Settings → About phone → MIUI versionto check for new versions.
Using the built-in Cast function
The easiest way to display an image is to use the system's native function. In the shell MIUI This tool is called "Broadcast" or "Cast". It is based on protocols Miracast And DLNA, which are supported by most modern Smart TVs.
To start the process, pull down the notification shade and find the "Broadcast" icon. If it's not on the main panel, tap the pencil or edit button to add a widget. Once activated, the system will begin searching for available devices on the network.
When the list appears on the screen, select your TV. You may see a connection confirmation prompt on the TV screen—confirm it using the remote. After this, your smartphone screen will be fully mirrored on the larger display.
- 📱 Open the Control Panel and find the "Broadcast" icon.
- 📺 Select your TV from the list of available devices.
- ✅ Confirm the connection on the TV screen if required.
- 🎬 Launch a video or game on your smartphone to check.
It's important to note that when using this method, your phone's screen must be on. If you lock your device, the stream will be interrupted. This distinguishes mirroring mode from streaming through apps.
Broadcasting via video service apps
If you're watching videos from YouTube, Netflix, or other streaming platforms, using full screen mirroring isn't effective. In this case, it's better to use the built-in Cast feature within the app itself. This allows your smartphone to act as a remote control, while the video is streamed directly to your TV.
This approach significantly saves battery power. Redmi 9 and reduces processor load. Picture quality in this mode is often higher, as the TV decodes the video stream itself, using its own resources.
Find the streaming icon (the rectangle with waves) in the corner of the video player. Tap it and select the target device. Play, pause, and volume controls remain on your phone, but you can minimize the app or even lock the screen, and the video will continue playing.
Why might video lag during broadcasting?
Slowdowns are often caused by Wi-Fi congestion from other devices or insufficient internet speed. Try disabling downloads on other devices.
Some services may require authorization with the same account on both devices to function properly. Ensure the regional settings of both services match to avoid playback errors.
Third-party streaming apps
In situations where built-in tools don't work or the TV doesn't support standard protocols, third-party solutions come to the rescue. Apps like Google Home, Web Video Caster or LocalCast may solve the compatibility issue.
These programs are especially useful for older TVs that do not have Smart functions but are connected to set-top boxes. Android TV Box or ChromecastThey can stream not only video files, but also browser content.
| Application | Transmission type | Format support | Advertising in the free version |
|---|---|---|---|
| Google Home | Screencasting | Full screen | No |
| Web Video Caster | Streaming video | MP4, MKV, AVI | Eat |
| LocalCast | Media files | All popular | Eat |
| AirScreen | Receiver (for TV) | AirPlay, Miracast | No |
When installing third-party software, pay attention to the requested permissions. To function properly, the program requires access to the local network and media files. Without these permissions, the app will not be able to find the TV or play videos.
Setting up your TV and troubleshooting
If the connection fails, the problem may lie in the TV's settings. On many Samsung, LG, or Sony models, you need to manually activate the signal reception function. It may be called Screen Share, Miracast or be in the Connections menu.
It's also worth checking whether your router's firewall or your phone's antivirus software is blocking the connection between the devices. In rare cases, rebooting the router can help, as this clears the DHCP cache and renews IP addresses.
⚠️ Please note: TV menu interfaces may vary depending on the manufacturer. If you can't find the desired menu item, please refer to the instructions for your specific TV model.
Another common cause of problems is outdated TV firmware. Manufacturers regularly update their software, adding support for new encryption standards and codecs. Check the "Support" or "About TV" section in the device menu.
☑️ Connection diagnostics
Comparison of connection methods and image quality
The choice of broadcasting method depends on your goals. If you need to show a presentation or photo album, screen mirroring is suitable. For watching movies, it's better to use the built-in features of video services to avoid straining your smartphone.
Image quality over a wireless connection is always slightly lower than over a wired one due to data compression. However, on modern TVs with a screen size of 40 inches or larger, the difference is virtually imperceptible, especially when using a 5 GHz network.
Input lag over wireless connections makes this method unsuitable for fast-paced online gaming. For gaming, wired solutions or streaming via cloud services optimized for TV are better.
Frequently Asked Questions (FAQ)
Why doesn't the TV detect the Redmi 9 phone?
Most often, the devices are on different networks (for example, one on a guest network, the other on the main network). It's also possible that the TV isn't receiving a signal, or the software is out of date.
Is it possible to display a screen if there is no internet, only a router?
Yes, the internet is not required for Miracast and DLNA to work; it is enough for the router to create a local network to which both devices are connected.
Does the battery drain a lot when streaming?
When mirroring your screen, power consumption is significantly higher than usual due to the Wi-Fi module and processor being active. It's recommended to keep your phone charged.
Does Redmi 9 support audio streaming to external TV speakers?
Yes, when the connection is successful, the audio will automatically switch to your TV's audio system. If this doesn't happen, check the audio settings in the streaming menu.