How to Use a TV as a Second Monitor via Wi-Fi: 5 Proven Methods

Turning your TV into a wireless second monitor solves several problems at once: it saves desk space, eliminates cable clutter, and allows you to comfortably work with a larger screen. However, Wi-Fi connection has its own nuances, from image lag to resolution limitations. In this article, we'll examine all the current methods—from built-in features of modern TVs to specialized adapters—and explain how to minimize lag and achieve stable signal transmission.

The main misconception: many users think that to do this, they just need to turn it on Miracast or AirPlay on both devices. In practice, however, everything depends on the TV model, the computer's operating system, and even the router. For example, TVs Samsung 2018–2023 support Wi-Fi Direct, but only with devices on Windows 10/11, and for MacBook Additional software will be required. We've tested all methods on real devices and compiled checklists for each case.

If you want to do more than just duplicate your screen, but expand your workspace (for example, for multitasking or streaming), it's important to understand: A wireless Wi-Fi connection will always lose out to a wired HDMI connection in terms of latency—the average lag is 30–100 ms, which is critical for gaming or video editing.However, for office tasks, watching movies, or presentations, this method is ideal.

1. Checking compatibility: what you need to connect

Before attempting to connect your TV and computer, make sure your equipment meets the minimum requirements. Key criteria:

• 📺 TV: must support at least one of the protocols - Miracast (for Windows/Android), AirPlay (for Apple) or Google Cast (for Chromecast). Most models LG (With webOS), Samsung (With Tizen), Sony (With Android TV) And Xiaomi This is possible for models produced after 2016. You can check this in the menu. Settings → Network → Wi-Fi Direct or Screen → Wireless Projection.
• 💻 Computer/laptop:
  • For Windows 10/11: built-in support Miracast (checked by the command dxdiag → tab Save All Information → search for a string Miracast: Available).
  • For MacOS: version not lower Monterey 12.0 (For AirPlay).
  • For Linux: manual configuration will be required via gnome-network-displays or similar.
• 📶 Router: should work in the range 5 GHz (for minimal lags) and maintain the standard 802.11ac or newer. Connection speed - not less than 300 Mbps.

If your TV was released before 2015 or does not support the listed protocols, do not despair: you can use external adapters like Google Chromecast, Amazon Fire TV Stick or Mi TV StickThey will cost 2–5 thousand rubles, but will add support for modern standards.

⚠️ Warning: On TVs Samsung series J (2015–2016) function Miracast It may be unstable due to outdated firmware. Before connecting, update the firmware via the menu. Support → Software Update → Over the Network.

2. Method 1: Connecting via Miracast (Windows → TV)

Miracast — the most universal protocol for wireless screen sharing, built into Windows 10/11 and most modern TVs. It doesn't require the internet, as the devices connect directly via Wi-Fi DirectHowever, the method has limitations:

• ⚠️ Maximum resolution — 1920×1080 at 30 Hz (on some TVs it is possible 4K@30Hz, but with artifacts).
• ⚠️ Delay (input lag) — 50–100 ms, which is noticeable when playing games or drawing.
• ⚠️ There is no sound support in some configurations (solved by setting in Sound parameters).

Step-by-step instructions:

1. On TV:
   • Open the menu Settings → Network → Wi-Fi Direct (on Samsung) or Screen → Wireless Projection (on LG).
   • Activate connection standby mode. On some models, you need to select Miracast or Screen Mirroring.

On a computer with Windows:

• Click Win + K (or Win + P → Connect to a wireless display).
• From the list of available devices, select the name of your TV.
• Confirm the connection on TV (you may be asked to enter a PIN code).

If your TV does not appear in the list, check:

• 🔄 Restart both devices.
• 📶 Make sure your TV is turned on Wi-Fi Direct, not regular Wi-Fi.
• 🔧 Update your graphics card drivers on your PC (via device Manager or the manufacturer's website).

Wi-Fi Direct enabled on TV |

PC graphics card drivers updated|

TV and PC on the same network (if using a router)|

VPN and firewalls are disabled|

Screen resolution checked (not higher than 1080p for stability)-->

⚠️ Attention: On laptops with hybrid graphics (Intel + NVIDIA/AMD) Miracast may not work correctly. In this case, force switching to the discrete graphics card in NVIDIA/AMD Control Panel.

3. Method 2: Using AirPlay (Mac → TV)

For device owners Apple (MacBook, iMac, iPad) the optimal option is a protocol AirPlayIt is supported by TVs. LG (With webOS 4.0+), Samsung (2018 models and newer) Sony (With Android TV) And Vizio. Advantages:

• 🎵 Sound support without additional settings.
• 🖥️ Possibility to expand the screen (mode Extended Desktop).
• 🔄 Minimal delay - 20–40 ms (better than Miracast).

How to connect:

1. On TV:
   • Activate AirPlay on the menu Settings → General → AirPlay and HomeKit (on LG) or Settings → Apple AirPlay (on Samsung).
   • Specify a name for the device (e.g. Bedroom TV) and enable the option Code required for safety.

On Mac:

• Open System Preferences → Monitors.
• Click on the button Connecting to AirPlay and select your TV.
• Select mode: Duplicate (same image) or Expand (second screen).

If the image is lagging:

• 📶 Switch your router to a different channel 5 GHz with width 80 MHz.
• 🔌 Connect MacBook Power supply - Wi-Fi performance may be limited when running on battery power.
• 🎯 Reduce the resolution on your TV to 1920×1080 (in settings AirPlay).

4. Method 3: Google Cast and Chromecast (universal option)

Protocol Google Cast (and devices Chromecast) is one of the most reliable ways to connect a TV as a second monitor, especially if you have Android-device or ChromeOS. Advantages:

• 🌐 Works via the Internet (does not require Wi-Fi Direct).
• 🎮 Supports games with minimal lag (if used Chromecast Ultra or Google TV).
• 🔧 Flexible quality settings (you can sacrifice resolution for smoothness).

Instructions for Windows/Mac/Linux:

1. Connect Chromecast to the TV through HDMI and configure it through the app Google Home on a smartphone.
2. Make sure your computer and Chromecast connected to the same Wi-Fi network.
3. In the browser Chrome:
   • Open the menu (⋮) → Broadcast.
   • Select Broadcast tab or Broadcast your screen.
   • Please indicate yours Chromecast in the list of devices.

For stable operation:

• 🛠️ In the settings Chromecast (Google Home → device → Settings → Video) select Auto or 720p to reduce lags.
• 🔗 If you use Windows, install the official software Google Cast for Education for advanced features.

What should I do if Chromecast can't find the network?

If your Chromecast won't connect to Wi-Fi, try:

1. Reboot your router and device.

2. Disable MAC address filtering in your router settings.

3. Set the Wi-Fi channel manually (e.g. 6 or 11 for 2.4 GHz).

4. If you're using dual-band Wi-Fi, connect your Chromecast to the 5GHz network (in your Google Home settings).

5. Method 4: Specialized programs (SpaceDesk, Duet Display)

If built-in tools don't work or you need advanced features (such as touch control from a tablet), you can use third-party apps. We tested three of the most reliable solutions:

1. SpaceDesk (free for basic features):
   • Works over a local network or via the Internet.
   • Supports up to 4K@30Hz with a delay 10–30 ms.
   • There are versions for Windows, Android And iOS.

How to set up:

1. Install SpaceDesk Driver on PC and SpaceDesk Viewer on TV (via Google Play on Android TV or App Store on Apple TV).
2. Connect both devices to the same network.
3. Run on PC SpaceDesk Server, on TV - find the server in the list and connect.
4. Duet Display (paid, ~10$):
   • Optimized for iPad And Android-tablets, but it also works with Android TV.
   • Supports Apple Pencil And Wacom-styluses.
   • Delay - 5–15 ms (better than Miracast).

Warnings:

• ⚠️ SpaceDesk may conflict with antivirus software (add an exception for spacedeskService.exe).
• ⚠️ On TVs Samsung Tizen for installation SpaceDesk you will need to enable developer mode (Settings → General → About TV → Software → Enable Developer Mode).

6. Method 5: Wireless HDMI (for minimal lag)

If you need maximum stability without lag (for example, for gaming or professional work), consider wireless HDMI transmittersThey operate on a frequency 60 GHz (standard WirelessHD) and provide delay <10 ms — almost like wired HDMI. Popular models:

• 📡 IOGEAR Wireless HDMI Kit (to 4K@60Hz, range 10 m).
• 📡 Nyrius Aries Pro (support 1080p@120Hz, ideal for gamers).
• 📡 J-Tech Digital Wireless HDMI (budget option, up to 1080p@60Hz).

How to connect:

1. Connect the transmitter to HDMI port computer, receiver - to the TV.
2. Plug both devices into the power supply (some models require power through USB).
3. On your TV, select the appropriate HDMI input.

Cons:

• 💰 Cost - from 5 to 20 thousand rubles.
• 📶 Sensitivity to obstacles (walls, furniture).
• 🔋 Consumes more energy than Wi-Fi solutions.

⚠️ Warning: Wireless HDMI transmitters often conflict with routers operating on channels 149–165 (5 GHz). Before purchasing, check the router settings and change the channel if necessary. 36–48.

7. Troubleshooting: lags, connection breaks, no sound

Even with proper setup, common issues can still arise. Let's look at the most common ones and how to solve them:

Problem	Possible cause	Solution
The screen is lagging	Weak Wi-Fi signal, network congestion	Switch to 5 GHz. Disconnect other devices from the network. Reduce the resolution to 1280×720.
No sound	Incorrect audio output settings	On Windows: Settings → System → Sound → Select output device. On Mac: System Preferences → Sound → Output.
The TV doesn't find the PC	Driver conflict or firewall	Update your video card drivers. Temporarily disable your antivirus. Check if it is enabled Miracast V gpedit.msc (For Windows Pro).

If nothing helps:

• 🔄 Reset the network settings on your TV (Settings → General → Network Reset).
• 📱 Use your smartphone as an intermediary: connect it to your TV via Miracast, and to the PC - through TeamViewer or SpaceDesk.
• 🔧 Check if the router is in the "Secure Mode" mode. AP Isolation (it blocks interaction between devices on the network).

8. Alternative Options: When Wi-Fi Isn't Enough

If your wireless connection is unstable or you need maximum performance, consider alternatives:

• 🔌 Wired HDMI connection:
  • Zero lag, support 4K@120Hz And HDR.
  • For laptops without HDMI ports, use adapters. USB-C → HDMI (For example, Anker 565).
• 📡 Powerline adapters:
  • Transmission of a signal via electrical wiring (speed up to 1 Gbps).
  • Suitable if the router is far from the TV.
• 🌐 Cloud solutions:
  • Services like Rainway or Parsec allow you to stream your screen over the internet.
  • Suitable for remote work, but requires speed from 50 Mbps.

When choosing between a wired and wireless connection, focus on your goals:

• 🎮 Games → only HDMI or wireless HDMI transmitter.
• 🎬 Movies/TV series → Chromecast or AirPlay.
• 💼 Office work → Miracast or SpaceDesk.

FAQ: Frequently Asked Questions

Can I use my TV as a second monitor to play games over Wi-Fi?

Technically yes, but with some caveats: delay (input lag) when connecting via Miracast or AirPlay makes up 50–100 ms, which is critical for shooters or racing games. For a comfortable gaming experience, it's best to use:

• Wireless HDMI transmitter (delay <10 ms).
• Wired connection via HDMI.
• Streaming via Steam Link (if the game is supported).

For casual games (strategies, quests) Chromecast or SpaceDesk will do.

Why does the TV turn off after a few minutes of connection?

This is a typical problem. Miracast on Windows, related to energy saving settings. Solutions:

1. Open Control Panel → Power Options → Change plan settings → Change advanced power settings.
2. Find the parameter Wireless Network Adapter Settings → Power Saving Mode and install Maximum performance.
3. Disable screen timeout on your TV (Settings → Display → Sleep Timer).

If the problem persists, update the Wi-Fi adapter drivers on your PC.

How do I connect my TV to my PC if it doesn't have Wi-Fi?

There are several ways:

• 📶 Use external Wi-Fi adapter for TV (for example, TP-Link TL-WN725N, connects via USB). Suitable for Android TV or LG webOS.
• 🔌 Connect Ethernet adapter (if the TV supports wired internet) and use Google Cast or SpaceDesk.
• 📱 Use smartphone as a bridge:
  1. Connect your phone to TV via HDMI (through MHL adapter or USB-C → HDMI).
  2. Install on your PC and phone SpaceDesk or TeamViewer.

For older TVs (before 2015) the only reliable option is wired connection via HDMI or purchase Chromecast/Fire TV Stick.

Is it possible to use a TV as a second monitor for Linux?

Yes, but with limitations. Depending on the distribution and protocol:

• Miracast:
  • Install gnome-network-displays (For GNOME):

  sudo apt install gnome-network-displays

  • Run the utility and select the TV from the list.
• Google Cast:
  • Use a browser Chrome or application mkchromecast:

  sudo apt install mkchromecast

  • SpaceDesk