Modern smartphones such as Xiaomi Redmi 9, have powerful screens and processors that allow for high-quality content playback. However, to comfortably view movies or photos on a large screen, it is often necessary to display the image from the phone on the TV. Wireless connection via Wi-Fi is the most convenient and aesthetic solution, eliminating unnecessary cables and adapters.
Technologies Mi Home and operating system Android Android devices offer several built-in tools for this purpose. Users have access to both native screen casting features and third-party apps that support DLNA and Chromecast protocols. In this article, we'll cover all the current methods for turning your smartphone into a media remote control.
Before you begin setup, it is important to ensure that both devices - and Redmi 9, and the Smart TV are on the same local network. This is a fundamental requirement for the stable operation of most wireless data transfer protocols. If the router broadcasts signals on both 2.4 GHz and 5 GHz frequencies, make sure both devices are connected to the same frequency to avoid device detection issues.
Preparing the network and devices for synchronization
A successful connection directly depends on the signal quality and correct router settings. Wi-Fi router The device must be functioning normally, and the DHCP server must correctly assign IP addresses to all connected devices. If you're using a guest network or have corporate access restrictions, devices may not be able to see each other, so use your main home network.
On the phone Redmi 9 You need to activate the wireless module and check the operating system version. Older versions MIUI may contain bugs that prevent stable video streaming. It is recommended to update your smartphone's firmware via the settings menu to eliminate software errors.
- 📶 Make sure your TV and phone are connected to the same router and not to different access points.
- 🔄 Restart your router if your connection is unstable or keeps dropping.
- 🔐 Disable AP Isolation in your router settings if it is enabled.
Walls, mirrors, and household appliances can cause interference, especially at the 5 GHz frequency. To stream 4K video, it's recommended to be in the same room as the router or use a wired Ethernet connection from the TV, if possible.
⚠️ Note: If your router is distributing two networks with the same name (Smart Connect), try temporarily separating them into different SSIDs for 2.4 GHz and 5 GHz to force both devices to connect to the same frequency.
Using the built-in "Cast" feature in MIUI
The fastest way to display the screen Redmi 9 to a TV - use the system's "Cast" function. This method is based on the protocol Miracast, which allows for real-time screen image transmission with minimal latency. This technology requires no additional software installation on the TV if it supports the Wi-Fi Display standard.
To activate the feature, pull down the notification shade and find the "Cast" icon. If it's not on the main screen, tap the Edit Panels button and drag the icon to the active area. Once enabled, it will search for available devices within range.
Settings → Connection and Sharing → BroadcastYour TV's name should appear in the list of found devices. When you select the TV, a connection confirmation request may appear on your smartphone screen, which you'll need to confirm with the remote control. After that, the image will appear on the screen. Redmi 9 will be fully duplicated on the big screen.
- 📺 The function duplicates everything that happens on the smartphone screen, including notifications.
- ⚡ The signal delay is minimal, which allows you to use the phone as a gaming console.
- 🔋 Active use of the screen and Wi-Fi significantly increases battery consumption.
It's worth noting that your phone may become warmer when using this method. This is a normal reaction from the processor when encoding the video stream. If you plan on watching for long periods, it's best to charge the device or use a cooling pad.
Streaming via the Google Home app (Chromecast)
If your TV has a built-in module Chromecast or works on the basis Android TV, the optimal solution would be to use the Google ecosystem. Application Google Home is the official smart home control tool and allows you to stream content from most popular apps.
Unlike Miracast, this doesn't mirror the entire screen, but rather transmits a link to the content. The TV automatically downloads the video from the internet, reducing the load on the processor. Redmi 9 and allows you to use your smartphone for other tasks while watching.
To get started, download the app Google Home from the Play Market and sign in to your account. The app will automatically detect your TV on the network. By clicking on the device icon, you'll see the "Cast Screen" or "Cast Media" button.
| Parameter | Miracast (Broadcast) | Chromecast (Google Home) |
|---|---|---|
| Signal source | Smartphone (Redmi 9) | Internet (direct TV) |
| Battery consumption | High | Short |
| Picture quality | Depends on Wi-Fi signal | Stable (up to 4K HDR) |
| Background mode | Impossible (screen active) | Possible |
This method is especially convenient for streaming services like YouTube or Netflix. You can start a video on your phone, tap the Cast button within the app, and select your TV. The video will continue playing on your TV even if you minimize the app or lock it. Redmi 9.
☑️ Check before launching Chromecast
Stream media via DLNA and Mi Video
For playing local files, such as movies stored in memory or photos, the technology is ideal DLNAIn smartphones Xiaomi The standard player is responsible for this Mi Video or application Mi RemoteThis method is ideal when there is no internet access, but there is a local network.
Open the video file in the player Mi Video on yours Redmi 9In the playback interface, look for an icon with a screen or a rectangle with an arrow (usually in the upper right corner). Clicking it will display a list of available DLNA renderers, including your TV.
Once you select a device, the video file will begin buffering and playing on your TV. The advantage of this method is that the TV decodes the video automatically if its hardware capabilities allow it. This relieves the load on the phone and ensures smooth playback of large files.
⚠️ Important: The video file format must be supported by your TV. If the TV cannot decode the audio codec (such as DTS or AC3), there may be no sound even if the picture is playing.
If the standard player does not see the TV, you can use third-party applications, such as BubbleUPnP or LocalCastThey have more flexible settings and are often better at finding devices in complex networks. In the settings of these apps, you can manually add the TV's IP address if the automatic search doesn't work.
What to do if DLNA is not working?
Make sure the DLNA feature (sometimes called Media Renderer or PlayOn) is enabled on your TV. Also, check your router's firewall—it shouldn't block ports 1900 (UDP) and 8000-9000 (TCP), which are used for media discovery and transmission.
Solution and troubleshooting
Despite the ease of setup, users may encounter situations where Redmi 9 The TV doesn't show up, or the connection keeps dropping. Most often, the problem lies in the system's power saving settings. MIUI, which aggressively closes background processes to save battery life.
Go to battery settings and find the app you're using for streaming (e.g., YouTube or Mi Video). In the "Power Saving" menu, select "No Restrictions." This will prevent the system from killing the data transfer process when the phone's screen goes dark or you switch to other tasks.
- 🛑 Clear the cache of connection-related apps via the "Applications" menu.
- 🔄 Reset your phone's network settings if the problem is system-related.
- 📡 Move closer to the router to avoid data packet loss.
It's also worth checking the date and time on both devices. Clock missync can cause content protection protocol (HDCP) authorization errors, causing the screen to be black but the audio to continue playing. Set automatic time synchronization via the network.
Alternative methods and third-party applications
If the standard tools do not meet your requirements, the store Google Play offers many alternatives. Apps like Web Video Caster Casters allow you to stream video from websites that don't have a built-in Cast button. They work like a browser, intercepting the video stream and sending it to your TV.
For advanced users who own TVs based on Android TVWi-Fi debugging (ADB) is available. It allows you to install apps directly from your phone to your TV or control the system more deeply than the standard remote allows. However, this method requires enabling developer mode.
There are also specialized applications from Xiaomi, such as Xiaomi TV (formerly Mi Remote), which turns your smartphone into a fully-functional remote control with a touchpad and text input. This is especially convenient for searching for movies in online cinemas, as entering text with a remote control is time-consuming and cumbersome.
Using third-party software gives you more control over the process, but may require purchasing a premium version to remove ads or unlock features like high-definition screen mirroring. Always check reviews before installing unknown apps.
⚠️ Please note: App and TV interfaces are subject to update. Button locations and menu item names may differ from those described in the instructions. Consult the manufacturer's current manuals if you cannot find the option you need.
Why doesn't the TV detect the Redmi 9 phone?
Most often, the devices are on different networks (for example, one on 2.4 GHz, the other on 5 GHz, and the router isolates them). DLNA/Miracast may also be disabled in the TV settings. Check if the router is configured to restrict data exchange between clients (Client Isolation).
Can I play games on TV with Redmi 9?
Yes, using the "Broadcast" mode (Miracast). However, input lag can range from 100 to 300 ms, which is critical for fast-paced shooters, but perfectly acceptable for turn-based strategy or card games. For a comfortable gaming experience, it's recommended to use 5 GHz Wi-Fi.
Does broadcasting affect video quality?
When using Chromecast, the original quality remains, as the TV automatically downloads the stream. When mirroring (Miracast), the image is compressed by the phone's codec, which can lead to compression artifacts, especially in dark scenes if the Wi-Fi signal is unstable.
Is internet required for DLNA to work?
No, a local Wi-Fi network is sufficient for DLNA to work. The router doesn't need to be connected to the global network, but it must create a local network through which the phone and TV can exchange data.
How to reduce audio latency during broadcasting?
It's difficult to completely eliminate latency, as it's caused by encoding and decoding time. You can try lowering the video quality in the streaming settings or using a wired connection (HDMI via a Type-C adapter) if your Redmi 9 supports video output via USB (although this model usually does not support video output via USB-C, so only Wi-Fi optimization remains).