Modern technology allows you to completely eliminate wires when viewing multimedia content. Transferring files, photos, or the entire desktop screen from your computer to your TV has become a standard feature of most smart TVs. This eliminates the need to find HDMI cables, connect flash drives, or use complex adapters. Simply connect both devices to the same local network, and you're ready to share data.
There are several main protocols for implementing this task, each with its own characteristics. The choice of a specific method depends on your computer's operating system, Smart TV platform, and the type of content being streamed. You can use standard Windows tools, third-party applications, or built-in browser features. Understanding the difference between streaming and screen mirroring will help you avoid lag and audio desync.
In this article, we'll cover all current connection methods in detail, from the simplest built-in tools to setting up media servers. We'll explore the nuances of working with different operating systems and troubleshoot common errors that occur during initial setup. Proper network configuration will ensure maximum data transfer speed and high image quality.
Basic technologies of wireless data transmission
Before you begin setting up, you need to understand the technologies behind the data transfer process. The main standard for multimedia networks is DLNA (Digital Living Network Alliance). This technology allows devices to see each other on a local network and share content. The TV acts as a renderer, and the computer acts as a server, providing access to files.
Protocols are used to duplicate images in real time Miracast And Wi-Fi DirectThey create a direct connection between devices, allowing for low-latency video streaming. This is ideal for presentations or video viewing, where synchronizing actions on the PC and TV is essential. However, these technologies may not be fast enough for gaming due to video stream compression.
Apple owners use their ecosystem standard - AirPlayIt provides high-quality transmission and low latency, but requires appropriate support on the TV or an Apple TV set-top box. Some manufacturers, such as Samsung and LG, integrate AirPlay 2 support directly into their Smart TVs.
⚠️ Attention: The DLNA protocol doesn't support streaming protected content (DRM) from some streaming services. If you try to stream Netflix or iTunes to your TV via DLNA, you'll see a black screen instead of video. For streaming, use the built-in apps on your TV.
It is also worth mentioning Google's proprietary solutions. Technology Chromecast built-in Allows you to stream the contents of a Chrome browser tab or the entire screen directly to your TV. This is a universal method that works on virtually any platform with the Chrome browser installed.
Preparing equipment and network
The quality of wireless transmission directly depends on the state of your local network. For stable operation without lag or buffering, it's critical that both the computer and TV are connected to the same router. If one device is on a guest network and the other on the main network, they won't see each other.
The ideal option is to connect both devices to a 5 GHz network. This band provides higher throughput, which is necessary for transmitting 4K or HDR video. The standard 2.4 GHz band is often congested by neighboring routers and household appliances, causing interference.
Check that your computer's network adapter drivers are up-to-date. Outdated software may not work correctly with new encryption standards or device discovery protocols. Also, make sure the router's "Remote Access" feature is enabled. UPnP (Universal Plug and Play), which is required for automatic detection of media servers.
☑️ Network readiness check
Broadcasting via built-in Windows functions (Miracast)
Windows 10 and 11 operating systems feature a powerful built-in tool for connecting to wireless displays. This feature is based on the Miracast standard and requires no additional software. It allows you to completely mirror your desktop or extend it onto your TV screen.
To get started, make sure your TV's wireless signal reception feature is enabled. Depending on the brand, this may be called something different: Screen Share on LG, Smart View on Samsung, or simply "Wireless Monitor" in the signal source menu. Once enabled, the TV will enter connection standby mode.
On your computer, press the key combination Win + KThe "Connection" panel will appear on the right side of the screen. The system will begin searching for available devices. Once you see your TV's name in the list, click it. A connection confirmation prompt may appear on the TV screen, which you'll need to accept using your remote.
Once the connection is successful, you can control the projection modes. Click Win + Pto select the operating mode: duplicate, extend, or just the second screen. In extend mode, the TV becomes an extension of your desktop, convenient for watching videos in a browser window while working on documents on the monitor.
What to do if Windows doesn't see the TV?
If the search yields no results, check the Connected Devices Platform Service in Windows. It should be running and set to Automatic. Also, try temporarily disabling any antivirus or third-party firewall software that may be blocking device detection on the local network.
Using DLNA to play files
If your goal is to watch a movie or presentation from photos, rather than mirror the entire screen, DLNA is the best choice. This method is less demanding on processor resources and provides more stable picture quality, as the TV decodes the video stream itself. The computer, in this case, merely serves as a data storage device.
In Windows, this feature is implemented through "Media Streaming." To enable it, open "Settings" -> "Network & Internet" -> "Status." Find the "Media Streaming Settings" link or search for "Streaming Settings."
In the window that opens, click "Enable media streaming." You'll see a list of devices on your network. Find your TV and make sure "Allowed" is checked next to it. You can also configure libraries to stream only specific video or music folders.
To play a file, simply right-click it, select "Cast to device," and select your TV. The video will start automatically. Alternatively, open the file in a player (such as VLC or Windows Media Player), right-click the video, and select "Play on device."
| Parameter | Miracast (Projection) | DLNA (Streaming) | Chromecast (Tab) |
|---|---|---|---|
| Transmission type | Real-time screen mirroring | Transferring a file for playback | Broadcasting browser content |
| Download to PC | High (video encoding) | Low (data transfer only) | Medium/High |
| Control | From a computer | From a TV or PC remote control | From a computer |
| Quality | Depends on Wi-Fi signal | Original file quality | Depends on the internet speed |
Broadcasting via Google Chrome browser
The Google Chrome browser is a versatile tool for those who don't want to fiddle with Windows system settings. The built-in Chromecast feature lets you cast the contents of a tab, the entire desktop, or a local file to any Chromecast-enabled TV or Android TV.
To get started, open the Chrome browser on your computer. Click the three dots in the upper-right corner of the menu and select "Cast." If you don't see this option, make sure you have the latest version of the browser installed.
In the window that appears, you'll see a list of available devices. Before starting broadcasting, click the "Sources" button. Here you can choose what you want to show: a browser tab, the entire monitor screen, or a specific file from your computer. Selecting "Full Screen" allows you to broadcast any application running on your PC.
After selecting the source, click on your TV's name. The image will appear on the big screen. To stop casting, open the "Cast" menu again and click "Stop," or use the button on your TV if your remote supports Chromecast.
Connection Features for macOS and Apple TV
Mac users are in the Apple ecosystem, where technology dominates. AirPlayIf you have an Apple TV or Smart TV with built-in AirPlay 2 support (recent Samsung, LG, Sony, and Vizio models), the process is extremely simplified.
Click the "Control Center" icon in the menu bar (the two intersecting lines) and select "Screen Mirroring." Select your TV from the list. To prevent accidental connections, a four-digit code may appear on the TV screen. Enter this code on your Mac.
macOS also supports standard protocols. You can use the "Sharing" feature in System Preferences to share folders with DLNA players on your TV, although native AirPlay support is generally preferred due to better optimization and HDR support.
⚠️ Attention: When using AirPlay, make sure "AP Isolation" is not enabled on your router. This feature prevents devices within the same Wi-Fi network from communicating with each other, making it impossible for your computer to detect your TV.
Solving typical problems and errors
Despite the simplicity of technology, users often encounter connection issues. The most common one is the computer not detecting the TV. In 90% of cases, this can be resolved by checking whether the TV is on the same network. Make sure you're not connected to guest Wi-Fi on one device and the main Wi-Fi on another.
Another common issue is poor performance, choppy video, or out-of-sync audio. This indicates a weak Wi-Fi signal. Try moving the router closer to the TV or computer, or switching to the 5 GHz band. Channel congestion could also be the issue.
If all else fails, try rebooting your router. Network equipment often accumulates errors in its routing table or DHCP leases, preventing proper device discovery. Simply powering off the router for 10 seconds often solves the problem.
In rare cases, your antivirus software could be to blame. Third-party antivirus firewalls (Kaspersky, ESET, Avast) may block incoming connections for device detection services. Try temporarily disabling network protection or adding an exception for the "Network" service (private network).
Why isn't my TV showing up in the list of available devices?
The problem is most likely with your Windows network profile. Go to "Network & Internet Settings" -> "Properties" for your connection. Make sure the network profile is set to "Private" and not "Public." When set to a public profile, Windows hides your computer from other devices for security reasons.
Is it possible to transmit sound separately to external speakers while a video is playing on TV?
Yes, this is possible. When using Miracast, audio is usually sent to the TV by default. However, in Windows Sound settings (right-click the speaker -> Sounds), you can change the default playback device back to your speakers or headphones while the image remains on the TV. Some applications (such as VLC) allow you to select the audio output device independently of the video output device.
Does screen sharing affect internet speed?
When using Miracast or DLNA for local files, the internet is completely bypassed; traffic is limited to your home network. However, if you stream online videos (YouTube, Netflix) using Chrome's "Cast Tab" feature, your computer downloads the video from the internet and redirects it to your TV, which doubles your data usage and can reduce speeds for other devices.