How to set up the second screen on Xiaomi Redmi Note 9: all ways + errors and solutions

Owners of the Xiaomi Redmi Note 9 often face the need to duplicate or expand the screen of the smartphone to an external monitor, TV or projector. This is true for presentations, watching movies on the big screen, streaming games or multitasking. However, the standard settings of MIUI are not always obvious, and some features may be hidden or limited to the firmware version.

In this article, we’ll look at all the working ways to connect the second screen to the Redmi Note 9, from embedded tools (Miracast, USB-C) to third-party applications. We’ll focus on common bugs (such as not having a Wireless Display option on the menu) and how to get around them. If you tried to connect but failed, here’s a solution.

1. Compatibility Check: What You Need for the Second Screen

Before setting up screen duplication, make sure your device and hardware meet the requirements.The Xiaomi Redmi Note 9 supports image output via:

• 📶 Miracast wireless protocol (built into the MIUI, It may not be available on some versions of the).
• 🔌 USB-C → HDMI (Adapter with DisplayPort Alt Mode support).
• 📱 Third-party applications (e.g. ApowerMirror or TeamViewer QuickSupport for remote access).

Critical moments:

• 🔋 Charging while in use: wirelessly transferring the screen severely drains the battery.Plug the smartphone to the network.
• 📶 Wi-Fi speed: Miracast requires a 5GHz network connection (2.4GHz will have lags).
• 🖥️ External Display Resolution: Redmi Note 9 Maintains maximum full support HD (1920×1080) upon 30 Hz.

⚠️ Note: Redmi Note 9 with firmware MIUI 12.5 and later, the wireless display option can be hidden. To return it, you need to roll back. MIUI 12.0.3.0 or use ADB-teams (more on this below).

Method 2: Wireless screen via Miracast (built-in function)

The easiest method is to use Miracast’s built-in support in MIUI. However, there are pitfalls: the option may not be available on the menu due to regional restrictions or firmware updates.

Instructions for activation:

1. Open Settings → Connection and Sharing → Wireless display.
2. If there is no item, try the alternative path: Settings → Additional → Special features → Wireless display.
3. Turn on device search and select your TV/monitor from the list.
4. Confirm the connection on both devices.

Connect both devices to the same Wi-Fi network (5GHz)

Turn off VPNs and firewalls

Update the TV/monitor firmware

Charge your smartphone to 50% or higher-->

If the wireless display option is not available:

• 🔧 Use it. ADB-The command for forced inclusion: adb shell settings put global wireless_display_on 1 After completing, restart the phone.
• 📱 Install QuickShortcutMaker from Google Play and find the hidden activity of com.android.settings.DisplaySettings.

⚠️ Note: Some Samsung TVs and LG The Redmi Note 9 can only connect in Mirroring mode, not screen expansion. USB-C-adapter.

3. Method 2: Connect via USB-C → HDMI (without lags)

For stable, low latency connectivity, use a USB-C to HDMI adapter with DisplayPort Alt Mode support, which works even on custom firmware and is independent of the MIUI version.

Step-by-step:

1. Buy a certified adapter (we recommend models on the Realtek RTD2173 or Parade PS175) chip.
2. Connect the adapter to the port USB-C smartphone HDMI-cable to the monitor/television.
3. Settings menu → Display. → Select the display mode: 🔄 Duplicate (the same image on both screens), 📱🖥️ Expand (second screen as desktop).

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If the image doesn’t appear, try flipping the adapter in the USB-C port – some models require a specific orientation of the connection.

Possible problems and solutions:

Method 3: Third-party applications (ApowerMirror, TeamViewer)

If the built-in methods don't work, use third-party utilities, which are suitable for remote control or duplicating the screen on a PC/Mac.

The best apps for Redmi Note 9:

• 🖥️ ApowerMirror — duplication on PC/TV with the ability to control the mouse.
• 🌍 TeamViewer QuickSupport is a remote access without root.
• 🎮 Scrcpy (for PC) - displaying the screen of the smartphone on the computer with minimal latency. ADB.

Instructions for ApowerMirror:

1. Download the application to your smartphone and PC from the official website.
2. Connect both devices to the same Wi-Fi network.
3. Launch the app on PC, scan it. QR-smartphone-screen.
4. Allow screen access in the Redmi Note 9 settings (Settings → Applications → Special Access → Screen recording).

⚠️ Note: Apps like ApowerMirror can record your screen in the background even when you're not streaming the image. Turn off screen recording permission after use (Settings) → Annexes → Permits).

5: Error Solving: Why the Second Screen Is Not Working

If the connection fails, check these points:

• 🔌 Cable/Adapter: Try another one USB-C → HDMI Adapter (cheap Chinese models often don't support Alt Mode).
• 📶 Wi-Fi: Switch to 5GHz network – 2.4GHz is not suitable for Miracast.
• 🔄 Firmware: On MIUI 13+ may require a rollback until MIUI 12.5 for Miracast to work.
• 🔒 Firewall: Turn it off VPN Antiviruses (for example, Avast blocks the broadcast of the screen).

Typical errors and fixes:

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If neither method works, check if HDCP (Content Protection) is disabled in your TV settings. On some Sony Bravia and Samsung QLED models, this blocks output from mobile devices.

6. Second screen optimization: resolution, FPS, sound

After successful connection, adjust the settings for comfortable work:

• 🎛️ Permission: Ideally — 1920×1080 (Full HD). If the image is blurry, check the zoom settings on TV.
• 🎮 Frame rate: Through USB-C 60 Hz, Wi-Fi maximum 30 Hz.
• 🔊 Sound: To output through HDMI activate the settings → Sound. → Exit through HDMI. If you don’t have an option, use Bluetooth headphones.
• 🔋 Power consumption: In wireless transmission, the battery runs down in 1-2 hours. 18W+.

For games or videos, we recommend:

• 📱 Disable Windows animation (Settings) → The phone. → Version. MIUI → 5 times tap to turn on Developer Mode → Developer settings → Scale of animation: Off.).
• 🎯 In games, for example, PUBG Mobile or Call of Duty Select Graphical Settings Balanced or HD, not HDR/Ultra is gonna lower the lags.

7.Alternative options: Chromecast, DLNA, MHL

If standard methods don’t work, consider these alternatives:

• 📺 Google Chromecast: Connect your device to your TV and stream the screen through Google Home. minus: delay ~500 ms.
• 📂 DLNA (BubbleUPnP: Suitable for viewing photos/video, but not for screen duplication.
• 🔌 MHL-Adapter: An outdated standard, but works on some TVs. Requires a separate power source for the adapter.

Comparison of alternatives:

FAQ: Frequent questions about the second screen on the Redmi Note 9