Xiaomi Redmi 9 screen broadcast: a complete guide to wireless and wired image transmission

Xiaomi Redmi 9 is one of the most popular budget smartphones that supports screen broadcasting to external devices, which allows you to mirror the display of the phone to a TV, monitor or even a laptop, turning a mobile device into a full-fledged media center, but not all users know how to set up the broadcast correctly, which protocols to use and how to fix typical errors.

In this article, we will discuss in detail all available methods of broadcasting with Redmi 9: from wireless technologies (Miracast, Google Cast, Wi-Fi Direct) to wired solutions through the Internet. USB-C or HDMI-Adapters. Particular attention will be paid to the configuration of the connection with the Xiaomi Mi TVs. TV, Samsung, LG and other brands, and consider why broadcasts may be interrupted or not launched.

If you want to watch movies from your phone on a big screen, show presentations or play mobile games comfortably, this guide will help you avoid common problems and choose the best method of connection.

What is a screen broadcast and why you need it

Screen translation (or mirroring) is a technology that allows real-time transmission of images from a smartphone display to another device, in the case of Xiaomi Redmi 9, this is implemented through:

• 📶 Wireless protocols: Miracast, Google Cast (Chromecast), Wi-Fi Direct, DLNA.
• 🔌 Wire adapters: USB-C → HDMI, USB-C → VGA (Requires support for DisplayPort Alt Mode).
• 🖥️ Specialized applications: TeamViewer, ApowerMirror, LetsView (for PC).

Main use cases:

• 🎬 Video viewing: Broadcasting movies from YouTube, KinoPoisk or local files to the big screen.
• 🎮 Games: connecting the gamepad to the phone and displaying the picture TV play-in.
• 📊 Presentations: Showing slides or documents on a projector without having to copy files.
• 📱 Remote help: show the screen to a specialist to diagnose smartphone problems.

It is important to understand that broadcasting is different from simply streaming (e.g., via YouTube Cast) and that mirroring on an external device displays the entire contents of the phone’s screen, including notifications, menus, and even passwords (if you type them during a session).

Technical requirements for broadcasting with Redmi 9

Before setting up the broadcast, make sure your Xiaomi Redmi 9 and the receiving device meet the minimum requirements:

⚠️ Attention: Redmi 9 with firmware MIUI 12.5+ Miracast may not be supported on-board due to manufacturer restrictions, and use third-party apps like ApowerMirror or Screen Mirroring.

To check Miracast support on your TV:

1. Open the settings. TV.
2. Go to the Network section → Miracast → Wireless projection.
3. If you have an option, the device is compatible.

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If your TV doesn’t support Miracast, there’s a port HDMI, Buy a Chromecast adapter or Mi TV Stick – they will add support for Google Cast for 2-3 thousand rubles.

Method 1: Wireless broadcasting via Miracast

Miracast is a wireless video streaming standard without an internet connection, built into most modern TVs and runs directly between Redmi 9 and the Redmi 9. TV. The main advantage is low latency (important for gaming) and no dependence on the router.

Instructions for connection:

1. On the TV, activate Miracast mode (in the Sources menu) → Wireless projection).
2. On Redmi 9, open Settings → Connections and sharing → Broadcast (or Wireless Display).
3. Turn on the Wireless Display slider and wait for the device to be found.
4. Select your TV from the list. Confirm the connection on both devices.

If the option is not available, broadcast:

• 🔄 Reboot the phone.
• 📱 Update the firmware to the latest version MIUI.
• 🛠️ Install Miracast Screen Sharing from Google Play.

⚠️ Warning: When broadcasting via Miracast, Redmi 9 can warm up more than usual.°C, interrupt the session and let the device cool down.

Method 2: Streaming via Google Cast (Chromecast)

Google Cast is an alternative to Miracast developed by Google. It works through the Google Home app and supports not only screen mirroring, but also the streaming of content from apps (YouTube, Netflix, Spotify).

How to set up:

1. Install the Google Home app from the Play Market on Redmi 9.
2. Connect a Chromecast or TV with built-in Cast support to the same Wi-Fi network as the phone.
3. Open Google Home, click + → Set up your device → New device.
4. Follow the instructions for adding Chromecast.
5. To mirror the screen: Open the notification bar on Redmi 9. Find the Broadcast (or Cast) button. Select your Chromecast from the list.

The advantages of Google Cast over Miracast:

• ✅ It works via the Internet (you can broadcast from phone to phone). TV elsewhere).
• ✅ Supports streaming without mirroring (saves battery life).
• ✅ Compatible with most streaming services.

⚠️ Note: When mirroring through Google Cast, some apps (such as Netflix or Disney)+) They may block the broadcast due to the protection of the content (DRM). In this case, use Miracast or HDMI-adapter.

Method 3: Translation of the wired USB-C → HDMI

If wireless methods are unstable or require minimal latency (for example, for games), use a wired connection via an adapter. Xiaomi Redmi 9 supports DisplayPort Alt Mode, which allows you to display the image to the external screen through the port. USB-C.

What you need:

• 🔌 adapter USB-C to HDMI (For example, Baseus HDMI Adapter or original from Xiaomi).
• 📺 Cable HDMI (It usually comes with an adapter).
• 🔋 Power supply for the phone (broadcast drains the battery faster).

Step-by-step:

1. Connect the adapter to the USB-C port on Redmi 9.
2. Connect the adapter to the TV with an HDMI cable.
3. On the TV, select the HDMI signal source.
4. The phone will be notified of the connected display. Press Allow.
5. In screen settings (Settings) → Display. → Display mode) select permission (recommended) 1920×1080 steady-work).

Limitations of wired connection:

• ❌ Not all adapters are compatible with Redmi 9 (DisplayPort Alt Mode support is required).
• ❌ Maximum resolution - Full HD (1080p) (4K unsupported).
• ❌ Charging your phone via an adapter may not work (use a separate power cable).

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Wired connection through HDMI Provides minimal latency (about 20-30 ms), which is critical for gaming and watching dynamic video.

Common Problems and Their Solutions

Even with the right setup, the stream from Redmi 9 can be unstable. Let’s look at the typical errors and how to fix them:

⚠️ Note: If you are broadcasting via Miracast on the screen TV Artifacts appear (strips, flickering), try to turn off Adaptive Brightness in the Redmi 9 display settings.

To diagnose connection problems:

1. Check if your TV supports you. Miracast/Google Cast (instructions are in the user manual).
2. Make sure the phone turns off the plane mode and Wi-Fi is turned on.
3. Try connecting to another device (like a Windows laptop). 10/11, Miracast-supporting).

Broadcasting to laptop or PC

If you need to display the Redmi 9 screen on a laptop or desktop PC, use one of the following methods:

1. Through Miracast (Windows) 10/11):

• On PC: Open the Options → System system → Projection on this computer and select Available everywhere.
• On the phone: turn on the broadcast through Settings → Wireless display and select your PC.

Through mirror annexes:

• 🖥️ ApowerMirror – supports PC management and screen recording.
• 🖥️ LetsView – a free solution with minimal delay.
• 🖥️ TeamViewer QuickSupport – Remote Assistance.

3. Through USB-debugging (for developers):

If you need a stream without delay (for example, for streaming), use ADB:

adb tcpip 5555


adb connect [IP- phone address]:5555




scrcpy

This will require:

• Enable Developer Mode on Redmi 9 (7 times click on Build Number in Settings).
• Activate USB-debugging.
• Install scrcpy on PC.

⚠️ Note: When broadcasting through USB-If you debug the phone, you'll see a screen recording notification on the screen.

FAQ: Frequent questions about the broadcast with Redmi 9