How to connect the second screen to Xiaomi Redmi 9C: all ways with pros and cons

Xiaomi Redmi 9C is a budget smartphone with limited hardware, but even on it you can organize the display of images on the second screen, the main thing is to choose the right method depending on your tasks: streaming video to the TV, dubbing the screen for presentations or expanding the workspace for multitasking.

In this article, we’ll break down all the ways you can connect your second screen to the Redmi 9C, including wireless (Miracast, Google Cast), wired adapters (USB-C → HDMI), and third-party software solutions. We’ll focus on the limitations of the Helio G35 budget chipset and the nuances of MIUI customization that are often overlooked in standard instructions.

Spoiler: Redmi 9C cannot be fully developed desktop (like PC) due to lack of support for DeX or peers, but screen duplication or media streaming is feasible – read on to how to do this without loss of quality.

1. Checking the technical capabilities of the Redmi 9C

Before you try to connect the second screen, it is important to understand what your smartphone can and can not. Xiaomi Redmi 9C is equipped with a chipset MediaTek Helio G35 and runs MIUI (based on Android 10/11).

• 🚫 No hardware support for DisplayPort Alt Mode USB-C → It is impossible to connect directly to the monitor HDMI non-adapter.
• 🔄 Miracast is running on a delay ~100–200 ms (critical for gaming, but acceptable for video).
• 📱 Maximum resolution in wireless broadcasting — 1920×1080 (Full HD), But in practice, it is often limited. 1280×720 optimizing MIUI.
• 🔌 Port port USB-C supports USB 2.0 (speed up to 480 Mbps), which affects the quality of wired broadcasting.

For comparison, Xiaomi’s flagship models (such as the Redmi K50 Pro) support DisplayPort 1.4 via USB-C and can display images in 4K@60Hz. The Redmi 9C will have to be content with more modest features.

⚠️ Attention: If your Redmi is 9C purchased in China or for the Chinese market, Miracast support may be disabled in firmware. → The phone. → Version. MIUI. If necessary, re-flash to the global version (MIUI Global).

Method 2: Wireless Miracast broadcast (embedded function)

The easiest way to duplicate the Redmi 9C screen on a TV or monitor is to use Miracast technology. It is built into MIUI and does not require the installation of additional applications. The main condition is that your TV or monitor must support Miracast (most modern TVs on Android TV, Samsung, LG with WebOS 3.0+ are suitable).

Instructions for connection:

1. Open Settings on your phone and go to Connections and Sharing → Wireless Display.
2. Activate the Wireless Display slider (in some versions of MIUI, the item is called Screen Translation).
3. On the TV, turn on Miracast reception mode (usually in the Source → Screen Mirroring or Wi-Fi Direct menu).
4. From the list of available devices on your phone, select your TV. Confirm the connection on both devices.

Once successfully connected, the screen of the smartphone will be duplicated on the TV.

• 🎮 For games, a delay of 100–200 ms will make control almost impossible.
• 📺 For video (YouTube, Netflix) the delay is less noticeable, but artifacts are possible with a weak Wi-Fi signal.
• 🔋 Battery consumption increases by 20-30% due to active Wi-Fi broadcasting.

Make sure your TV and phone are connected to the same Wi-Fi network.|Check that the TV is on Screen Mirroring|Close background apps on your phone for stable broadcasting|Connect your phone to charge (broadcasting severely drains the battery)-->

⚠️ Attention: If the image on the TV slows down, try to reduce the resolution of the broadcast. To do this, click on the Wireless Display menu three dots (⋮) and select the Permission. → 720p. This will reduce the load on the processor.

Method 2: Wired connection via USB-C adapter → HDMI

If you need minimal latency (for example, to watch movies without lags), consider a wired connection. Redmi 9C does not support direct video transfer over USB-C, but you can use an external adapter with a chip converter (for example, USB-C to HDMI Adapter with MHL).

Important: conventional passive adapters (without the extra chip) won't work! You need an active electronics adapter that converts the signal. Examples of compatible models:

• 🔌 Baseus USB-C to HDMI Adapter (with a chip) LT8711)
• 🔌 UGREEN USB C to HDMI 1080P (supportive MHL)
• 🔌 Anker 310 USB-C to HDMI (budget-smartphone)

Instructions for connection:

1. Connect the adapter to the USB-C port of the phone.
2. Connect the adapter to your TV or monitor via an HDMI cable.
3. The phone will be notified of the connection of the external display.
4. From the Settings → Display → Display Mode, select Duplicate Screen or Expand Screen (the second option may not work on the Redmi 9C).

Quality expected:

• 🎬 Permission: up to 1920×1080@30Hz (60 Hz is not supported due to restrictions USB 2.0).
• 🕹️ Delay: ~30-50 ms (acceptable for video, but not for competitive games).
• 🔊 Sound: transmitted with video (unlike Miracast, where the sound is sometimes separated).

⚠️ Note: When using an adapter, the phone will discharge quickly, as USB-C The port transmits video and charges simultaneously, and we recommend connecting the phone to charge before the adapter is connected to avoid a voltage drop.

Method 3: Screen broadcasting applications (Miracast alternative)

If the built-in Miracast function is unstable, you can use third-party applications. They often offer additional features, such as broadcasting only sound or recording a screen.-3 Proven solutions for Redmi 9C:

For example, let’s take a look at the ApowerMirror setting:

1. Install the app on your phone and on your PC/TV (if you’re streaming on TV, use the Android TV version).
2. Connect both devices to the same Wi-Fi network.
3. Run ApowerMirror on your phone and select Mirror → Connect to the device.
4. On PC/TV, confirm the connection.
5. In the application settings, select Quality → 1080P and Bitrate → High.

Tip: If the image slows down, reduce bitrate or resolution, and close the background applications (especially instant messengers and games) to free up the CPU resources.

Wireless broadcasting (Miracast)|Wire adapter USB-C → HDMI|Third-party applications (ApowerMirror, etc.)|I haven't tried it yet.-->

5. Solving problems with connecting the second screen

Even with the right setup, you can get errors, and let's look at the typical problems and their solutions.

• 🔴 Phone can't find TV on Miracast: Reboot both devices. Make sure the TV supports Miracast (check model instructions). VPN On the phone, it can block the local connection.
• 🟡 Image lags or tears: Switch to 5 GHz Wi-Fi (if the router supports). Reduce the broadcast resolution to 720p. Close all apps except the one you are streaming (e.g. YouTube).
• 🔴 adapter USB-C → HDMI It doesn't work: Check that the adapter is active chip (passive won't work). Connect the phone to charge before the adapter is connected. Try another cable. HDMI (Sometimes the problem is in the cable, not the adapter).
• 🟡 No audio when broadcasting: In the broadcast settings (Wireless Display), turn on the option to Transmit Sound. If you use an adapter, check that the cable HDMI Supports sound (try another port on the port) TV).

If nothing works, try resetting the network settings on your phone: Settings → System → Settings Reset → Resetting your Wi-Fi, mobile network and Bluetooth settings. This often solves Miracast issues.

💡

If you connect the Redmi 9C to the monitor via an adapter and the image is "compressed" at the edges, check the zoom settings on the monitor. From the TV/monitor menu, select Just Scan or 1:1 Pixel Mapping mode to remove the cropping.

6. Alternatives: When a second screen is not needed

If your goal is to just bring content to the big screen, maybe a second screen isn't necessary.

• 📺 Smart TV supportive YouTube/Netflix: Run video directly on your TV through its apps. Most services sync your browsing history to your phone.
• 🎮 Game consoles (Xbox, PlayStation): If you need a large screen for games, plug in the console – the delay will be minimal.
• 💻 Connecting your phone as a webcam: With the DroidCam app, you can stream an image from a Redmi camera 9C PC-based streaming or video calling.
• 🔊 Bluetooth speakers: If the goal is to improve sound, connect your phone to external acoustics via Bluetooth or via the phone. AUX-cable.

For example, it’s easier to watch movies using Google Cast (built into YouTube, Netflix, Disney+) and just click the Cast button in the app and select the TV, and the content will be streamed directly, without duplicating the screen, which will save battery power and reduce latency.

💡

If you only need to duplicate the screen for a presentation or a photo, Miracast is the best choice. For video, you should use the built-in stream from applications (Google Cast), and for games, you should use a wired adapter with an active chip.

7. Frequent Questions (FAQ)