Modern smartphones, such as Xiaomi Redmi 9 Prohave powerful screens and processors capable of playing high-definition content. However, the diagonal of even the largest display is often inferior to a full-fledged home theater. The ability to broadcast images from your phone to the big screen opens up new horizons for watching movies, games and photo albums. This function becomes especially popular when you are visiting or in a hotel where there is no access to a personal computer.
There are several proven ways to implement this task, ranging from completely wireless solutions to a classic wired connection. The choice of a specific method depends on the capabilities of your TV, the availability of adapters and the quality of the Internet connection. In this article, we will analyze each option in detail so that you can enjoy your favorite movies with maximum comfort.
Wireless broadcasting via the built-in Mi Cast function
The simplest and most accessible method for device owners Xiaomi is using the built-in Miracast protocol, which is in the shell MIUI is called Mi Cast. This method does not require the purchase of additional equipment if your TV supports wireless image transmission technology. First of all, make sure that both devices - the smartphone and the TV - are connected to the same Wi-Fi network. This is a critical condition for stable operation.
To activate the function, open the control panel by swiping from top to bottom and find the icon Broadcast or Mi Cast. Once pressed, the system will begin searching for available displays on the local network. If the TV is not detected automatically, you may need to enable the signal reception mode in the settings of the TV itself, which is sometimes hidden in the "Network" or "Connections" sections.
- 📺 Make sure that Miracast or Anyview Cast support is enabled on the TV.
- 📶 Check that the smartphone and TV are in the same subnet of the Wi-Fi router.
- 🔋 Charge your phone to at least 30%, as broadcasting quickly uses up the battery.
- ⚙️ Turn off the power saving mode on Redmi 9 Pro for better performance.
⚠️ Attention: When broadcasting wirelessly There may be a slight delay (lag) between the action on the phone screen and what is displayed on the TV. This is normal for Miracast technology, but can interfere with dynamic games.
After successful pairing, your screen Xiaomi Redmi 9 Pro will be completely mirrored on the TV. You can minimize the broadcast application and use other phone functions, the image will remain on the big screen. To stop the process, just open the menu again Broadcast and press the shutdown button or simply block the smartphone.
Using Chromecast technology and streaming applications
If your TV has a built-in module Google Chromecast or is connected to it corresponding set-top box, the content transfer process becomes even more convenient. Unlike full screen mirroring, this technology allows you to transmit only the video stream, freeing up the smartphone's resources. Many popular services, such as YouTube, Netflix and ivi, have a built-in casts button for sending video to the TV.
This method also requires a single Wi-Fi network to work. Open the movie app on your phone, find the wave screen icon (usually in the top corner of the player) and select your TV from the list. The video stream will start playing directly on the TV, and the phone can be used as a control panel: pause, rewind or adjust the volume.
| Method | Delay | Quality | Battery consumption |
|---|---|---|---|
| Mi Cast (Miracast) | Medium | High | High |
| Chromecast | Min | Maximum | Low |
| HDMI cable | None | Maximum | Charging in progress |
It is important to note that some applications may block the broadcast of protected content through regular mirroring due to DRM licensing restrictions. In such cases, using a native button Cast inside the application is the only working solution. The Chromecast protocol provides a more stable picture without jerking, which is typical for direct screen mirroring.
If the cast button is not active, try restarting the router and applications on your phone. Sometimes the network cache interferes with device detection.
Wired connection via USB-C to HDMI adapter
For users for whom picture quality and the absence of any delays are critical, a wired connection is the ideal option. Xiaomi Redmi 9 Pro equipped with a port USB Type-C, which in this model supports video output. You will need a special adapter USB-C to HDMI, which can be purchased at any electronics store.
The connection is as simple as possible: insert the narrow end of the adapter into the phone's charging connector, and into the other end insert a standard HDMI cable coming from the TV. The TV will automatically detect the new signal source. If this does not happen, use the remote control and select the appropriate input (for example, HDMI 1 or HDMI 2) in the signal sources menu.
☑️ Check before purchasing an adapter
One of the main advantages of this method is the ability to simultaneously charge the device if your adapter has an additional port USB-C Power Delivery. This allows you to watch long movies or TV series marathons without fear of draining the battery. The picture is transmitted in its original resolution without compression, which guarantees maximum image clarity.
⚠️ Attention: Not all cheap adapters support video output. Make sure that the product description indicates support for the standard MHL or Alt Mode DP, otherwise the adapter will only work for data transfer or charging.
Setting the screen resolution and refresh rate
When When connecting Redmi 9 Pro to a TV, sometimes a situation arises when the image does not occupy the entire screen or looks stretched. This is due to the mismatch between the aspect ratio of the smartphone and the TV matrix. In the developer settings or in the broadcast menu, you can try changing the output parameters.
Go to the section Settings -> About phone and click on the item MIUI versionseveral times to activate developer mode. Then, in the advanced settings, find the item responsible for the minimum width or display emulation. However, be careful: incorrect settings can make the interface unreadable.
How to reset the screen settings?
If the image disappeared or became incorrect, simply unplug the cable or turn off the broadcast function. The phone screen settings will return to factory settings automatically after the connection with the external display is broken.
Most modern TVs have an automatic scaling function that adjusts the picture to its boundaries. If you see black bars around the edges, check the picture settings on your TV remote and select Fit to Screen or 16:9 mode. The smartphone Xiaomi by default tries to maintain the proportions so as not to distort the content.
Solving problems with the lack of sound during broadcasting
A frequent problem when connecting the phone to a TV is the lack of sound when the video is played normally. This may occur because the audio stream is still routed to the smartphone speaker. In such cases, you need to manually switch the audio output device.
While playing a video, click on the audio settings icon or use the volume bar. Select your TV or adapter from the list of available output devices. In the system Android this is often adjusted through the Bluetooth menu, even if the connection is made via Wi-Fi or cable, since audio protocols can work separately.
- 🔊 Check if the phone is set to silent mode.
- 🔌 For a wired connection, reconnect the cable HDMI.
- ⚙️ In the TV settings, make sure that external audio output (optical) is not selected.
- 🔄 Restart the application you are using to watch.
If the sound is wheezing or interrupted when connecting wirelessly, this indicates a weak Wi-Fi signal. Try moving closer to the router or turning off other devices that consume a lot of traffic. The stability of the audio channel directly depends on the bandwidth of the wireless network at the moment.
Sound problems are most often solved by switching the output device in the Bluetooth settings or restarting the source application.
Comparison of methods and final recommendations
Selecting a connection method Xiaomi Redmi 9 Pro to the TV depends on your specific tasks. It is ideal for quickly showing photos to friends or presentations, since it does not require extra wires. To watch movies in high quality for a long time, it is better to use Mi Cast, since it does not require extra wires. To watch movies in high quality for a long time, it is better to use Chromecast or a wired adapter to avoid heating up the phone and draining the battery.
A wired connection remains the “gold standard” for gamers, as it provides zero input lag. However, it limits the user's mobility to the length of the cable. Wireless methods give you freedom to move around the room, but require a high-quality network and may be sensitive to interference from neighboring routers. Menu interfaces and item names may vary slightly depending on the firmware version and TV model. Always check the latest instructions from your equipment manufacturers.
⚠️ Attention: Menu interfaces and item names may vary slightly depending on the firmware version MIUI and TV models. Always check your equipment manufacturer's instructions for the latest instructions.
Remember that broadcasting heavy video content in 4K resolution can put a strain on your smartphone's processor. Monitor the device temperature during long sessions. If the phone starts to get very hot, take a break or switch to a less resource-intensive connection method.
Why doesn’t the TV see the phone when searching for Mi Cast?
Most often, the problem lies in the fact that the devices are connected to different Wi-Fi frequencies (2.4 GHz and 5 GHz) or different guest access subnets. Also check if your router's firewall is blocking local device discovery (Multicast).
Is it possible to charge the Redmi 9 Pro when using an HDMI adapter?
Yes, but only if you use a quality USB-C to HDMI adapter with an additional Power Delivery (PD) port. Regular cheap adapters without a charging port will only transmit video, using up the phone's battery power.
Does Redmi 9 Pro support audio output via HDMI?
Yes, the USB Type-C port in this model supports digital audio transmission along with video. The sound will be reproduced through the TV speakers or the speaker system connected to it without the need for additional cables.
How to improve picture quality during wireless broadcasting?
Make sure that the router supports the 5 GHz standard and is in direct line of sight from the phone. Turn off unnecessary image processing effects on your TV (noise reduction, smoothing), which can add delay and artifacts.