Modern smartphones such as Redmi 9ATVs have powerful screens, but the diagonal size is often insufficient for comfortable viewing of high-definition video content. Streaming YouTube videos to a large TV screen via a wireless network allows you to transform your living room into a home theater. This is especially important when the built-in Smart TV is slow or doesn't support the latest app version.
The connection process is based on technology Wi-Fi Direct and streaming protocols such as Chromecast built-in or MiracastThe owner of a budget Xiaomi smartphone can easily set up synchronization if both devices are on the same local network. It's important to understand that connection stability directly depends on the router's signal quality and software version.
In this article, we'll take a detailed look at all available display methods, from built-in MIUI features to third-party solutions. You'll learn how to avoid lag, audio desync, and other common issues that arise when wirelessly connecting devices from different manufacturers.
Technical requirements and equipment preparation
Before you begin setup, you need to make sure your infrastructure is ready to handle heavy video streaming. Smartphone Redmi 9A The TV is equipped with an 802.11 b/g/n Wi-Fi module operating in the 2.4 GHz band, which imposes certain limitations on data transfer speed in noisy environments. The TV must also support Wi-Fi reception or have a connected Smart TV set-top box.
A critical requirement is that both devices are on the same subnet. This means the phone and TV must be connected to the same router. If you have a dual-band router, make sure the devices aren't on different frequencies (2.4 GHz and 5 GHz) with client isolation enabled, although this is automatic on most home networks.
⚠️ Attention: If your router broadcasts a network with the same name (SSID) on both frequencies, but devices cannot see each other, try temporarily separating the networks or forcing your phone to connect to the 5 GHz frequency if your router model allows you to manage device priority.
It's also worth checking for system updates on both devices. Redmi 9A Keeping your MIUI firmware up-to-date is important for proper operation of system detection services. On your TV, you need to update the YouTube app to the latest version available in the app store for your specific model.
Setting up the default broadcast feature in the YouTube app
The easiest and most reliable way to display an image is to use the built-in casting feature within the YouTube app itself. This method doesn't require any additional software and uses native Google Cast protocols, which are well supported by the MIUI Android user interface.
Launch the YouTube app on your Redmi 9A and open the video you want to watch. In the upper right corner of the interface, you'll see a rectangle icon with waves in the corner—this is the broadcast button. When you click it, the system will begin searching for available devices on your local network.
If the search is successful, you'll see a list of compatible TVs or set-top boxes. Select the desired device from the list. A connection confirmation prompt may appear on the TV screen, which you'll need to accept with your remote control. The video will then start playing on the big screen, and your phone can be used as a remote control.
☑️ Pre-launch check
It's worth noting that this method streams directly from YouTube servers to the TV, saving your smartphone's battery and reducing the load on your Wi-Fi network. In this case, the phone simply acts as a remote control.
Using the Cast feature in MIUI
If the built-in YouTube feature doesn't work or your TV doesn't support Google Cast, you can use the system's screen mirroring feature. In the MIUI shell installed on Redmi 9A, this tool is called "Broadcast" or "Cast".
To activate, pull down the notification shade and find the "Cast" icon. If it's not on the main screen, tap the edit menu button (usually a pencil or three dots) and drag the icon to the active area. Once activated, it will search for available displays.
Unlike in-app casting, this method broadcasts the entire smartphone screen. This means any notifications, incoming calls, or messages will be visible on the TV. Furthermore, the video stream is encoded by the phone and transmitted to the TV, which can lead to increased latency and battery consumption.
What should I do if the broadcast is interrupted?
If the connection keeps dropping, try rebooting your router. The Redmi 9A processor may also be overheating while encoding video. Remove the phone's case for better cooling or reduce screen brightness.
Some TVs require Miracast to be enabled in their settings. It's usually located in the "Network" or "Connections" section and may be called "Screen Mirroring," "Screen Mirroring," or "Intel's WiDi."
Alternative methods via third-party applications
When built-in tools fail, specialized apps from the Google Play Market come to the rescue. They often offer more flexible codec and buffering settings, which is useful for older TVs or unstable Wi-Fi.
One of the popular solutions is the application Web Video CasterIt allows you to open video files or streams from websites and stream them to your TV, bypassing standard browser restrictions. Installing the application on Redmi 9A It takes a couple of minutes and the interface is intuitive.
- 📱 Web Video Caster: Ideal for streaming videos from websites that don't have official TV support.
- 📺 TV Cast for Samsung/LG: Specialized utilities for TVs of specific brands, which often work more reliably than universal analogs.
- 🔄 AllCast: A powerful tool for transferring local files and streaming content, supports multiple protocols.
When using third-party software, it's important to pay attention to the permissions the app requests. To function properly, they require access to the local network and, in some cases, a microphone for voice search.
Solutions to common problems and errors
Despite the simplicity of the technology, users often encounter a situation where the phone doesn't detect the TV. The first cause is always a difference in network connections. Make sure your phone's mobile data is disabled during the search if it tries to switch to it automatically.
The second common issue is an outdated Wi-Fi security protocol. If the router is configured to operate only in WPA3 mode, and the TV's older software only supports WPA2, the connection may fail. Set the router's settings to mixed mode.
⚠️ Attention: Antivirus programs or firewalls installed on your smartphone or router may block ports needed for device detection (UDP 1900). Try temporarily disabling your protection to check.
It's also worth checking the date and time on both devices. System time out-of-sync for more than a few minutes can cause authorization errors in Google services, preventing connection.
Comparison of connection methods
To help you choose the optimal connection method, we've prepared a comparison table. It will help you understand which method is best for your specific situation and TV model.
| Parameter | YouTube Cast | Miracast (Broadcast) | Third-party applications |
|---|---|---|---|
| Picture quality | Up to 4K (depending on TV) | Up to 1080p (often compressed) | Depends on the application |
| Redmi 9A battery life | Short | High | Average |
| Multitasking capability | There is (background) | No (the screen is duplicated) | Partially |
| Stability | High | Average | Depends on the software |
As the table shows, the native casting method is the most preferred for watching YouTube. It provides the best quality and minimizes the load on the smartphone. Other methods should be used as backups.
Optimizing your Wi-Fi network for stable streaming
The quality of your wireless connection plays a crucial role in your viewing experience. Redmi 9A, operating in the 2.4 GHz range, it is critical that there is no interference from neighboring routers and household appliances such as microwave ovens.
It's recommended to configure a static IP address for the TV in the router to avoid address conflicts. You can also try changing the Wi-Fi channel to a less congested one using dedicated network analyzer apps for Android.
If the signal is weak, use a Wi-Fi repeater or set up a mesh system to provide uniform coverage throughout the apartment. This is especially important if the router is located far from the TV.
Frequently Asked Questions (FAQ)
Why isn't my TV showing up in the list of available devices on my Redmi 9A?
Most likely, the devices are on different networks or client isolation is enabled on the router. Also, check if your antivirus software is blocking local detection.
Is it possible to stream video if the phone battery is dead?
When using the Cast feature within YouTube, your phone uses almost no power decoding video, but the Wi-Fi module remains active. It's recommended to charge your phone while watching.
Does broadcasting affect internet speed for other devices?
Yes, streaming high-definition video (HD/4K) consumes a significant portion of your bandwidth. If your internet is slow, other users may experience delays.
Does the broadcast work without internet access?
Internet access is required to start streaming and authorization. However, if the content is already cached or played from a local server (DLNA), streaming via Wi-Fi is possible without an external network, but this requires complex setup.