Xiaomi Redmi Note 9 Pro is a popular laptop with a performance hardware and HDMI 1.4 port, but connecting to a TV is often questionable. Unlike smartphones, where there is enough wireless technology, laptops require consideration of screen resolutions, protocol versions and even features of the MIUI for PC operating system. In this article, we will analyze all the current methods of connection, from classic cable to wireless standards, and also solve typical problems like the lack of sound or image flickering.
It’s important to understand that the choice of method depends not only on the TV model (such as Samsung QLED or LG OLED), but also on its year of release. Older TVs without HDMI-ARC may not support audio transmission via cable, and budget models sometimes lack the Wi-Fi Direct module. We tested all variants on the Redmi Note 9 Pro with Windows 11 and MIUI 14 — the results in the comparison table below.
Connecting via HDMI: the most reliable way
HDMI cable provides stable video transmission in resolution up to 4K@30Hz (for Redmi Note 9 Pro maximum supported resolution is 1920×1080@60Hz), this method does not require network configuration and works even on TVs 10 years ago, the main thing is to use a high-quality cable with HDMI 1.4 (or higher).
Instructions:
- 🔌 Connect one end of the cable to the port HDMI on a laptop (located on the left side panel).
- 📺 The second end is free. HDMI-TV entrance (usually signed as HDMI1/ARC or HDMI2).
- 🖥️ On your laptop, press Win. + P and select Duplicate mode or Second screen only.
- 🔄 On the TV remote, select the source of the signal (Source or Input button).
Correction of the cable (try another one)|Update of graphics card drivers (Intel) UHD Graphics)|Screen resolution settings in Windows (not higher than) 1080p)|Disconnection of energy saving mode for HDMI-port-->
Redmi Note 9 Pro does not support HDMI 2.0, so when you connect to 4K-The image will automatically be downgraded to Full. HD. Attempt to forcefully expose 4K Windows settings will result in no signal.
⚠️ Warning: If there is no sound after connecting, check the Control Panel → The sound that the playback device selected NVIDIA High Definition Audio (for discrete graphics) or Realtek HD Audio (for built-in) On some TVs, sound is transmitted only through the HDMI-ARC — Look for the appropriate label on the port.
2. Wireless connection via Miracast (Wi-Fi Direct)
Miracast technology allows you to broadcast a laptop screen to a TV without wires, but with two conditions: the TV must support Wi-Fi Direct (or Screen Mirroring), and the laptop - to run Windows 10/11. Redmi Note 9 Pro is equipped with a Wi-Fi 5 module, which is enough for stable video transmission in resolution up to 1080p.
How to connect:
- On the TV, activate Screen Mirroring mode (in the Network → Wi-Fi Direct or Screen → Wireless projection menu).
- On your laptop, open Settings → System → Project on this computer and select Available everywhere.
- Press Win + K, find the name of your TV (like LG WebOS TV) and connect.
- Confirm the connection on both devices (entry may be required) PIN-code).
The advantages of Miracast:
- 🎮 Support for sound (unlike some alternatives like Chromecast).
- 🔄 Low latency (about 50 ms) – suitable for watching movies.
- 🚫 No router required – connecting directly between devices.
⚠️ Warning: On Samsung TVs older than 2018, Miracast may not work as well due to outdated firmware.Update TV software via the Support menu → Updating the software.
What if Miracast can't find the TV?
3.Using adapters: Type-C → HDMI
If your Redmi Note 9 Pro takes up a € HDMI port (for example, due to a breakdown), you can use a USB-C → HDMI adapter. Importantly, not all adapters are equally useful. Properly working requires a model that supports DisplayPort Alt Mode (for example, Baseus HDMI Adapter or the original from Xiaomi). Cheap Chinese adapters often give out artifacts or limit the resolution to 720p.
Step-by-step:
- 🔌 Connect the adapter to the port USB-C laptop.
- 📺 Connect the adapter to the TV through HDMI-cable.
- 🖥️ In Windows, go to Settings. → System system → Display and set up the second screen.
| Adapter type | Max, permission. | Sound support | Price (average) |
|---|---|---|---|
| USB-C → HDMI (passive) | 1080p@60Hz | ✅ Yes. | 800–1500 ₽ |
| USB-C → HDMI (active, with a chip) | 4K@30Hz | ✅ Yes. | 2000–3500 ₽ |
| USB-C → VGA | 1080p@60Hz | ❌ No. | 600–1200 ₽ |
| Dock Station (with multiple ports) | 4K@60Hz | ✅ Yes. | 4000–8000 ₽ |
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If the adapter doesn't work, try connecting it to another USB-C port on your laptop. On the Redmi Note 9 Pro, only the left port supports DisplayPort Alt Mode (marked by the display icon).
4. Connection via DLNA/UPnP (for media files)
If you don't want to duplicate the screen, but just stream movies or music, DLNA will do. It works over a home Wi-Fi network and is supported by most modern TVs (Sony Bravia, LG Smart TV, Xiaomi Mi TV), and you will need special software on a laptop, for example, Plex or Kodi.
Setting:
- Install a server program on your laptop (for example, Plex Media Server).
- Add folders with media files to the program library.
- On your TV, open the DLNA app (or Media Player) and select your laptop from the device list.
DLNA limitations:
- 🎬 Does not broadcast the laptop screen – only individual files.
- 🔊 Sound is transmitted, but there may be a delay in synchronization.
- 📶 Requires stable Wi-Fi (minimum 5GHz for Full) HD).
5. Alternative ways: Chromecast and AirPlay
If your TV supports Google Chromecast (built-in or via the console), you can stream the screen through the Google Chrome browser.
- Connect Chromecast to HDMI-Port TV and set it up via Google Home.
- In Chrome browser on laptop click ⋮ → broadcast.
- Select your Chromecast and Translate tab mode.
For owners of Apple equipment (for example, Apple TV) available AirPlay protocol, but on the Redmi Note 9 Pro it works only through third-party programs like 5KPlayer or ApowerMirror. the delay with such a connection can reach 200-300 ms, which is critical for games.
6. Solving common problems
Even with the right connection, errors can occur, and here are the most common ways to fix them:
| Problem. | Possible cause | Decision |
|---|---|---|
| No TV image. | Incorrectly selected signal source | On the TV remote, click Source and select the correct one. HDMI-entrance. |
| Flickering or artifacts | Damaged cable or high resolution | Try another cable or lower the resolution to 1280×720. |
| No sound through HDMI. | Incorrect reproduction device | In Windows: PCM by sound icon → Open sound parameters → Choose. HDMI-audio. |
| Miracast shuts down in 5 minutes | Energy-saving settings | Turn off the display sleep in the power supply parameters. |
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If you have an image after connecting to HDMI, but it is blurred, check the zoom settings in Windows. Go to Settings → System → Display and set a 100% scale for the second screen.
7. Optimizing Connection Performance
When streaming videos or games via a TV connection, the Redmi Note 9 Pro can slow down.
- 🎮 For games: Turn off vertical synchronization in graphics settings and set Performance in power options.
- 🎬 For movies: use a player MPC-HC or VLC hardware-accelerated (DXVA).
- 🔌 Connect your laptop to the socket – when working from a battery, Windows limits performance.