Modern technology has completely changed the way we view multimedia content, making cumbersome HDMI cables a thing of the past. Now, all you need to show a presentation to colleagues or share a family album on the big screen is a stable wireless connection. This is not only convenient, but also allows you to instantly switch between signal sources without getting tangled up in cables under your desk.
There are several proven synchronization methods, each of which has its own characteristics depending on the operating system of your PC and models Smart TVWe'll explore native Windows and macOS features, using the DLNA protocol for media files, and third-party gaming and streaming software.
The main advantage of wireless data transfer is freedom of movement. You can control playback from the couch while your laptop is on the desk, or play a movie from your browser and move it to the 65-inch panel. The key is to understand the difference between desktop mirroring and file streaming to choose the best option for your needs.
Preparing equipment and checking the network
The foundation for successful synchronization is a properly organized local network. It is absolutely necessary that both the computer and TV are connected to the same router. If your router Supports dual-band mode, it is critical to use the 5 GHz network, as it provides sufficient bandwidth to transmit 4K video without artifacts and buffering.
Check your computer's firewall settings. Windows security or antivirus software often blocks incoming connections, treating the TV as an intruder on the network. You'll need to change the network profile from "Public" to "Private" to allow device discovery.
- 🔌 Make sure both devices are on the same subnet (this usually happens automatically when connecting to the same router).
- 📶 For high-resolution video transmission, it is preferable to use the Wi-Fi 5 (AC) or Wi-Fi 6 (AX) standard.
- 🔄 Update your TV's firmware via the menu
Settings → Support → Software Updateto activate new protocols.
⚠️ Note: If you're using a guest Wi-Fi network or corporate internet with AP Isolation, devices won't be able to see each other. In such cases, creating an access point on your smartphone can be a temporary solution, but the speed will be limited by the mobile network.
Broadcasting via built-in Windows functions (Miracast)
Windows 10 and 11 operating systems feature a powerful built-in screen projection tool based on Miracast technology. This method allows you to completely mirror the image from your monitor to your TV, turning it into a second display. To get started, press the source selection button (often labeled as Input (or the square with an arrow icon) and select the "Screen Mirroring", "Cast" or "Screen Mirroring" option.
On your computer, press the key combination Win + K. The "Connection" panel will appear on the right, where the system will begin searching for available displays. Once yours is found, Smart TV Click on its name. A connection confirmation request may appear on the TV screen, which you'll need to confirm with the remote.
This method is ideal for office work, web browsing, or sharing photos in real time. However, keep in mind that Miracast creates a direct Wi-Fi Direct connection, which may temporarily reduce internet speed on the connected PC if the router doesn't distribute streams properly.
- 💻 Click
Win + Pto select the operating mode: “Repeat” (screen copy) or “Extend” (TV as a second desktop). - 🎨 In the display settings (
Settings → System → Display) you can change the resolution and orientation of the second screen. - 🔊 Sound is also transmitted to the TV; you can switch the audio output via the speaker icon in the tray.
What to do if Windows doesn't see the TV?
Make sure the wireless projection app is running on your TV. On some Samsung models, it's called "Guide" or "Wireless Display," while on LG models, it's built into webOS. Also, try restarting the "WLAN AutoConfig" service in Windows using the services.msc command.
Using DLNA technology for media files
Unlike screen mirroring, the DLNA (Digital Living Network Alliance) protocol is designed exclusively for streaming media content: video files, music, and photos. It's a more energy-efficient way to watch movies, as the TV decodes the stream itself, eliminating the computer's processor load. To use this method, the "Media Streaming" feature must be enabled on your PC.
Find the desired video file on your hard drive, right-click it, and select "Cast to Device." Select your TV from the list. Playback will begin almost instantly, and controls (pause, rewind, and volume) will be available through the standard PC player interface or the TV remote.
For more advanced management of your movie library, it is recommended to use specialized software, for example, DLNA Server or built-in media player Windows Media PlayerThey allow you to structure content by covers and descriptions, creating a user-friendly interface on your TV screen.
| Parameter | Miracast (Broadcast) | DLNA (Streaming) |
|---|---|---|
| PC load | High (encodes video) | Low (only transmits stream) |
| Control | From a computer | From a TV or PC remote control |
| Supported files | Everything on the screen | Video, photo, audio |
| Background work | The window cannot be minimized | You can work in other programs |
⚠️ Please note: The DLNA protocol does not support streaming DRM-protected content from some paid online movie theaters (Netflix, Disney+ in a browser). For these services, it is better to use the built-in apps on the TV itself.
Broadcasting for macOS users (AirPlay 2)
Apple device owners are fortunate to have an integrated ecosystem. AirPlay 2 technology allows you to stream content from a MacBook or iMac to TVs that support this standard. Many modern models from Samsung, Sony, LG, and Vizio already have a built-in AirPlay module, eliminating the need for an Apple TV set-top box.
To start casting, open Control Center in the menu bar (the icon with two switches) and click "Screen Mirroring." Select your TV from the list. If prompted, enter the code displayed on the TV screen on your computer. The image will appear instantly with minimal delay.
The system not only allows you to mirror your screen but also use your TV as a separate monitor in Extended Mode. AirPlay also supports separate audio streaming, allowing you to use your TV as a high-quality wireless speaker for playing music from iTunes or other players.
- 🍏 Make sure your Mac is running the latest version of macOS for stable AirPlay 2 operation.
- 🔒 When you connect for the first time, you may be asked to confirm the trusted device on your Mac screen.
- 🎞️ To stop mirroring, tap the AirPlay icon again and select "Turn off screen mirroring."
Third-party apps and browser streaming
When native methods fail or require advanced functionality, third-party solutions come to the rescue. Google Chrome has a built-in Cast feature that allows you to cast a tab or the entire desktop to Chromecast-enabled TVs (either built-in or via a set-top box). Click the three dots in the upper-right corner of the browser, select "Cast," and select the source.
For owners of TVs that don't support Miracast or AirPlay, there are aggregator apps. For example, the app LetsView or AirServer (installed on a PC, emulating a receiver) allow for communication between disparate devices. These programs often have their own codecs that improve image quality.
Gamers can use Remote Play (for PlayStation) or Xbox Console Companion to stream a game from the console to a PC and then mirror the browser window to a TV, although this will add additional input lag. While this isn't a significant issue for static tasks, it can be disruptive in shooters.
⚠️ Please note: App and browser interfaces are updated regularly. The location of the "Stream" buttons or quality settings may differ from those described. If you can't find this feature, use the search in the app settings.
☑️ Checking your broadcast readiness
Troubleshooting and quality optimization
Even with an ideal setup, compression artifacts, audio desync, or intermittent connection drops may occur. Most often, the problem lies in radio channel congestion. If you're using the 2.4 GHz band, neighboring routers and microwave ovens can cause significant interference.
Try lowering the transmitted image resolution in Windows projection settings. Sometimes, reducing the quality from 4K to 1080p significantly improves image smoothness and eliminates stuttering. It's also worth updating the Wi-Fi adapter drivers on your computer by downloading them from the manufacturer's official website rather than relying on Windows' automatic installation.
If the sound lags behind the video, in the Windows sound settings (Control Panel → Sound → Playback Device Properties) Find the "Advanced" tab and try changing the default format or disabling audio enhancements. This often solves the desync issue.
- 📡 Switch your router to a free channel in the 5 GHz range through the administrator settings.
- 💾 Clear the cache of your browser and Smart TV apps if streaming through them is unstable.
- 🔄 Restarting your router, computer, and TV is a classic but effective method for clearing network errors.
Why is the broadcast delayed (lag)?
Latency is caused by the time it takes to encode the video stream on the PC, transmit it over the air, and decode it on the TV. Wireless technologies physically cannot provide zero latency. For games, this can be 100-300 ms, which is noticeable. For movies and photos, this is unimportant.
Is it possible to transmit an image if there is no router?
Yes, many TVs support Wi-Fi Direct. This connects your computer directly to the TV's wireless module, creating a local network without internet access. The speed will be lower, and your PC's internet connection will be lost, but you will still be able to stream the image.
Is 5.1 or Dolby Atmos audio being broadcast?
When using Miracast and AirPlay, multichannel audio is usually transmitted if the TV and source device support these formats. However, when casting via the Chrome browser, the sound is often limited to stereo (2.0). For full surround sound, it's best to use HDMI or built-in apps on the TV.