Modern technologies allow you to completely eliminate unnecessary wires, turning your living room into a true multimedia center. Screencasting Screen mirroring is a feature that allows you to access content on a larger display without the need for HDMI cables. This is especially convenient for viewing vacation photos, showing presentations, or playing games from a laptop on panels with a diagonal of 55 inches or larger.
The main advantage of a wireless connection is flexibility: you can control content from the comfort of your couch, without being tied to your desk. However, to enjoy high-quality video without lag, it's important to configure your network settings correctly. In this article, we'll take a detailed look at various data transfer protocols and help you troubleshoot common connection errors.
Wireless video transmission technologies
Before you begin setting up, you need to understand which protocol your equipment uses. There are several main standards, each with its own characteristics and limitations. Most often, users encounter technologies Miracast, DLNA And AirPlay.
Miracast — is a standard developed by the Wi-Fi Alliance that enables the direct transmission of high-definition video and audio between devices. It creates a direct connection without requiring a router, although it often uses one for the initial handshake. It is the most universal option for connecting Windows PCs and Smart TVs.
In turn, DLNA (Digital Living Network Alliance) works differently: it allows you to stream media files (video, music, photos) from your computer to your TV over a local network. Unlike Miracast, DLNA doesn't always allow you to stream your desktop in real time, but rather serves as a media library. AirPlay — Apple's proprietary technology that ensures stable operation in the macOS and iOS ecosystem.
- 🔹 Miracast is ideal for full screen cloning and working in "second monitor" mode.
- 🔹 DLNA - suitable for playing saved files without loading the system in real time.
- 🔹 AirPlay 2 – provides better audio and video synchronization for Apple devices.
⚠️ Note: Some older TV models may only support DLNA, which will not allow you to display the Windows desktop in real time, but only files from folders.
The difference between Wi-Fi Direct and regular Wi-Fi
Wi-Fi Direct allows devices to connect directly to each other, bypassing the router. This reduces latency during video transmission, but may temporarily interrupt the internet connection on a mobile device if it doesn't support dual-channel operation.
Preparing equipment and network
Successful streaming directly depends on the quality and configuration of your local network. The first and most important rule: the computer and TV must be on the same subnet. This means both devices must be connected to the same router.
Please pay attention to your Wi-Fi frequency range. For 4K or even Full HD video streaming, it is highly recommended to use the frequency range 5 GHzIt provides higher throughput and is less susceptible to interference from neighboring networks and household appliances such as microwave ovens.
Check if network discovery is enabled on your PC. In Windows, this is controlled by your network profile. If the profile is set to "Public," the system may block connection attempts from external devices for security reasons.
☑️ Check before connection
You should also make sure the wireless display feature is enabled on your TV. It may be called "Screen Share," "Wireless Display," "Cast," or "Projector" in the Smart TV menu. Without this feature enabled, your TV will be invisible to your computer.
Setting up broadcasting in the Windows operating system
In Windows 10 and Windows 11, display functionality is built right into the interface. You won't need to install any third-party software if both devices support the Miracast standard. To get started, open the Action Center or press a key combination. Win + K.
The system will begin searching for available wireless displays. If the TV is configured correctly and connected to the same network, its name will appear in the list. After selecting a device, a connection confirmation prompt may appear on the TV screen. Accept this prompt with the remote control.
Once the connection is established, you can select the operating mode. Click Win + Pto open the project menu. Options include "Computer screen only," "Repeat" (copy the screen), "Extend" (turn the TV into a second monitor), and "Second screen only."
| Opening hours | Description | Best use |
|---|---|---|
| Repeat | The image on the TV copies the PC screen | Presentations, photo viewing |
| Expand | TV becomes an extension of the desktop | Multitasking, working with windows |
| Second screen only | The PC screen goes blank, only the TV works | Watching movies, playing games |
If the system reports "Connection failed," try updating your wireless adapter and graphics card drivers. Often, the problem stems from outdated network card software that doesn't support newer WPA3 encryption protocols or Wi-Fi Direct standards.
Using AirPlay technology on macOS
For computer owners MacBook, iMac macOS laptops are especially fortunate thanks to AirPlay integration. If your TV supports AirPlay 2 (common on Samsung, LG, Sony, and Apple TV built-in modules), the process takes seconds.
In the upper right corner of the screen (in the menu bar), find the "Control Center" icon (two toggle lines) or the video output icon. Select your TV from the list of available devices. The image will instantly appear on the large panel.
In macOS Display settings, you can choose how exactly you want to use your second screen. You can mirror the image or use your TV as an independent workspace. To manage these settings, go to System Preferences → Displays.
It's important to note that AirPlay requires devices to be authorized for it to work. Your TV may require you to enter a code displayed on your Mac screen or confirm the connection. This is a security measure to prevent unauthorized access to your screen.
Alternative methods via browser and applications
If the operating system's native features don't work or your TV doesn't support Miracast/AirPlay, you can use the Google Chrome browser. This method is based on Chromecast technology and works on any device with this browser installed (Windows, macOS, Linux).
Open the Chrome browser, click the three dots in the upper-right corner, and select "Cast." In the window that opens, you can choose to cast an entire tab, the entire desktop, or a specific file. Your TV must support the Chromecast built-in protocol or have a Chromecast/Android TV set-top box connected.
Another option is to use DLNA servers. You can share a folder with movies in Windows and open it through the Media app on your TV. For more advanced management, there are media library programs such as Plex or Kodi, which install the client application on the TV and the server part on the PC.
- 🔹 Google Chrome Cast is a universal method for any OS via a browser.
- 🔹 Plex/Kodi — ideal for organizing your home library of movies and TV series.
- 🔹 TeamViewer/AnyDesk — allow you to control your PC remotely via TV, but have a high latency.
⚠️ Please note: When streaming through the Chrome browser, the load on your computer's processor may increase significantly, as software encoding of the video stream requires resources.
Solving delays and quality issues
One of the main problems with wireless video transmission is audio and video desynchronization or a noticeable mouse cursor lag. This is often caused by Wi-Fi congestion or a weak signal. If you experience jerky video, try moving closer to the router or removing any physical obstacles.
It's also worth checking the resolution of the output image. If you're trying to stream 4K content over a low-bandwidth connection, buffering is inevitable. Try lowering the resolution on your PC to 1080p in the display settings (System → Display → Resolution).
Antivirus software and firewalls sometimes block device-to-device connections. If the connection drops immediately after starting, try temporarily disabling the third-party firewall or adding the streaming app to the exceptions list.
To diagnose network speed, you can use specialized utilities or built-in speed tests on your Smart TV. If the local network speed drops below 20-30 Mbps, stable, high-quality streaming will be impossible.
Why is there only a picture but no sound?
Sound may not be transmitted if the default output device in your system is "Speakers" instead of "Wireless Display-enabled device." Click the volume icon in the Windows system tray, select the output device, and click the name of your TV.
My TV isn't visible in the list of devices. What should I do?
Make sure "AP Isolation" is disabled on your router. This prevents devices connected to your Wi-Fi from seeing each other, which is necessary for Miracast and DLNA to work.
Is it possible to play fast-paced shooters over Wi-Fi?
For genres like CS:GO or Call of Duty, a wireless connection is not recommended due to the inevitable input lag. Even a minimal lag of 50-100 ms can be critical. For such games, an HDMI cable is better.
Does broadcasting affect internet speed?
When using Miracast or AirPlay, traffic flows within the local network and doesn't consume internet bandwidth. However, if you're streaming online video (for example, YouTube from a PC to a TV), traffic is used twice: first for downloading on the PC, and then for streaming on the TV, which can reduce overall speed.