Modern smartphones such as Redmi 9T, are equipped with powerful multimedia capabilities that allow you to stream content to a large screen wirelessly. This is especially convenient for watching movies, photos, or presentations with family or colleagues. Wireless connection via WiFi provides sufficient bandwidth to transmit high-resolution images.
The process of synchronizing your device with your TV may vary depending on your Smart TV model and operating system version. MIUIUsers have access to both built-in system functions and third-party apps that expand the basic functionality. Proper configuration of both devices ensures stable video streaming without lag.
In this article, we'll cover all current connection methods, potential technical nuances, and troubleshooting common errors. You'll learn how to activate broadcast mode and which network settings are critical for a successful connection.
Network requirements and device compatibility
For successful implementation of wireless image transmission, it is necessary that both devices are in the same information space. This means that Redmi 9T and Smart TV must be connected to the same WiFi networksUsing the router's guest mode or separating the 2.4 GHz and 5 GHz frequencies into different SSIDs may result in devices simply not being able to see each other.
Data transmission technology is often based on a standard Miracast or protocol Google CastMost modern TVs support these features natively, but in some cases, you may need to activate the signal reception mode in the TV menu. Make sure your TV's software is updated to the latest version.
⚠️ Note: If your router uses the AP Isolation feature, devices will not be able to communicate even on the same network.
Wireless connection speed directly impacts image quality. For 4K video streaming, it's recommended to use the Wi-Fi band. 5 GHz, which provides higher data transfer rates than 2.4 GHz. However, the 5 GHz signal has a shorter range and is less effective at penetrating walls.
Using the built-in "Cast" feature in MIUI
shell MIUI, installed on Redmi 9T, has a built-in tool for wireless connection to external displays. This function, often called "Broadcast" or "Wireless Display," doesn't require any additional software. It works by searching for available receivers on the local network.
To start the process, pull down the notification shade and find the "Cast" icon. If it's not on the main quick access screen, tap the edit button (usually a pencil or three dots) and drag the icon to the active area. Once activated, a search for available devices will begin.
☑️ Check before connection
Once your TV appears in the list, click on its name. A connection confirmation request may appear on the TV screen, which you'll need to accept with the remote control. After that, the image on your smartphone's screen will appear. duplicated on TV in real time.
It's important to note that when using this method, the phone may heat up faster than usual, as the processor and WiFi module are working in overdrive. You may also experience a slight delay between actions on the phone and the display, which is normal for wireless technologies.
Why does the sound disappear?
Sometimes, when connecting via Miracast, the audio may remain on your phone. Check the audio settings in the casting menu or use the audio output switch button in the notification shade.
Broadcast via the Google Home app
If the built-in tools don't work or the TV supports the ecosystem Chromecast, the best solution would be to use the official app Google HomeThis method provides a more stable connection and allows you to control content rather than simply mirroring the screen.
Download and install the app from the store Play MarketLaunch it and sign in to your Google account. The program will automatically scan the network and find compatible devices, such as TVs with Android TV or Chromecast built-in.
| Parameter | Built-in broadcast | Google Home | Third-party applications |
|---|---|---|---|
| Stability | Average | High | Depends on the developer |
| Picture quality | Up to 1080p | Up to 4K HDR | Up to 1080p |
| Delay | Eat | Minimum | High |
| Battery consumption | High | Average | High |
Select your TV from the list of devices and click "Cast screen." The system will warn you that all actions on your phone will be visible on the TV. Confirm the action, and mirroring will begin.
Using Mi Drop and Mi Remote technology
Equipment owners Xiaomi And Redmi can use proprietary utilities, which are often already pre-installed on the device. Application Mi Remote allows you to use your phone as a remote control, and also has the function of transferring media files to your TV if it supports the protocol DLNA.
To transfer a photo or video, open your gallery, select a file, and click the "Send" button or the TV icon. Select your TV from the list of available devices. This method is convenient because it doesn't require mirroring the entire smartphone interface; it only streams the selected content.
Function MIUI+ or similar ecosystem services allow for deeper integration, but require a compatible Xiaomi laptop or TV set-top box. This method may not be available for regular Smart TVs from other brands.
⚠️ Note: App interfaces may differ depending on the MIUI version (Global, China, Russia). Button layout may vary.
Using native apps often provides the best playback start speed, as they are optimized specifically for the smartphone's hardware. However, compatibility with older TVs may be limited.
Third-party streaming apps
When standard methods fail, third-party applications come to the rescue. One of the most popular solutions is the program Cast to TV or Web Video CasterThey allow you to stream video from your browser or local files to virtually any TV.
These apps work by creating their own server on the phone or directly sending a data stream to the TV's address. The user selects a video file in the app, which analyzes the network and offers a list of available devices, including DLNA And Chromecast receivers.
The advantage of such programs is their support for a wide range of video formats and codecs that may not be supported by standard system tools. They also often offer the ability to control playback from another device on the network.
It's worth keeping in mind that free versions of these apps often contain ads, which can interrupt your browsing experience. For continuous use, we recommend purchasing premium versions or using proven open-source alternatives.
Solution and troubleshooting
Despite the simplicity of the technology, users often encounter connection issues. The most common is that the phone doesn't detect the TV. First, check whether the TV is set to receive a signal (Screen Mirroring, Miracast, or similar).
If your devices see the network, but the connection keeps dropping or the image is choppy, try rebooting your router. Sometimes a router buffer overflow can cause packet loss during video streaming.
Why is the image on the TV not full screen?
This is due to the aspect ratio. The Redmi 9T's screen has a non-standard 16:9 aspect ratio. In the streaming settings or on the TV itself (under the "Screen Format" or "Aspect Ratio" menu), select "Fit to Screen" or "16:9" to stretch the image, or accept the black bars on the sides to maintain the aspect ratio.
Is it possible to play games on TV via WiFi?
Technically, it's possible, but input lag will make playing fast-paced shooters or racing games extremely uncomfortable in wireless mode. For gaming, it's better to use a cabled HDMI connection if your phone supports video output, or put up with lag in turn-based strategy games.
Does my internet connection affect streaming speed?
No, not if you're streaming local files. However, if you're watching online videos (YouTube, Netflix), the traffic goes over the internet. In this case, a slow internet speed will cause the video to buffer, regardless of the quality of the WiFi connection between your phone and TV.
In some cases, your antivirus or router firewall may block ports needed for device detection. Try temporarily disabling filtering or creating an unrestricted guest network to test.
⚠️ Note: Wireless module specifications and software may be updated by the manufacturer. If the menus described differ, please refer to the official documentation for your MIUI version.
Following all the recommendations will allow you to enjoy the content with Redmi 9T on a big screen with minimal effort. Wireless streaming technology continues to evolve, becoming increasingly reliable and convenient for the end user.