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Modern technology makes it easy to eliminate unnecessary cables and stream content from a laptop or desktop PC to a large TV screen. It's the perfect way to watch movies, share photos, or even play games in a more comfortable environment. A wireless Wi-Fi connection provides sufficient bandwidth for streaming high-definition video, including 4K, if the equipment supports the relevant standards.
There are several main protocols and technologies used for this purpose. The specific method you choose depends on your computer's operating system, TV brand, and the presence of additional devices, such as media players. Understanding the differences between Miracast, DLNA and Chromecast will help you choose the best option for your situation.
In this article, we'll cover step-by-step instructions for various use cases. You'll learn how to set up screen projection, how to stream only video files, and how to troubleshoot common connection issues. The key is to ensure all devices are on the same local network, which is a basic requirement for most methods.
Wireless image transmission technologies
Before you begin setting up, it's important to understand the terminology, as manufacturers often use different names for the same functions. The basic standard for screen mirroring is MiracastThis technology allows for the transmission of video and audio signals in real time, creating an exact copy of what is happening on the computer monitor.
The second popular method is DLNAUnlike Miracast, it doesn't mirror the entire screen, but allows you to stream individual media files (videos, photos, music) to compatible devices. The TV acts as a renderer, and the computer acts as a server. This is convenient when you just want to watch a movie without being distracted by system notifications.
The third option is to use proprietary ecosystems such as Google Chromecast or Apple AirPlayThese technologies often provide more stable operation and better optimization, but may require additional software to be installed on the PC. For example, AirPlay on Windows requires a third-party app or built-in support in new Smart TV models.
⚠️ Please note: Wi-Fi network bandwidth directly impacts image quality. To stream 4K content, we recommend using a router that supports 802.11ac (Wi-Fi 5) or newer, operating in the 5 GHz band.
Also worth mentioning is the protocol Wi-Fi DirectIt allows devices to connect directly, bypassing the router. This can be useful if your router doesn't support multicast traffic or is overloaded with other devices. However, connection speeds in this mode may be lower than when using a full-fledged network infrastructure.
Preparing equipment and network
Successful setup is impossible without properly preparing the infrastructure. The first and most important requirement is that the computer and TV are on the same subnet. This means they must be connected to the same router. If you have a dual-band router, make sure both devices are connected to the same frequency (either 2.4 GHz or 5 GHz), although modern routers often combine them into a single network.
Check for software updates on both devices. Manufacturers Smart TV Patches are regularly released to improve the stability of wireless modules. It's also worth updating your computer's Wi-Fi adapter drivers, as older versions may not work correctly with new encryption standards or media transfer protocols.
- 📡 Make sure that AP Isolation is not enabled on your router, which prevents devices from seeing each other on the network.
- 🔌 Make sure your TV is connected to Wi-Fi and not via a LAN cable if you want to use Wi-Fi Direct (although this isn't always critical for Miracast).
- 🛡️ Temporarily disable your firewall or antivirus software on your PC if they are blocking detection of devices on your local network.
Pay special attention to power saving settings. The computer should not go into sleep mode while streaming, otherwise the connection will be lost. In Windows, this can be configured through the Power Panel, where you should select the "High Performance" plan or disable the hard drive and wireless adapter.
☑️ Check before connection
Broadcasting via built-in Windows tools (Miracast)
Windows 10 and 11 operating systems have a built-in "Projection" feature, which is based on the Miracast standard. This is the easiest way to transmit an image without installing third-party software. The technology works on the Wi-Fi Direct principle, so even if the router is turned off (but the device adapters support Direct), a connection can be established, although the initial handshake often requires a network connection.
To get started, press the key combination Win + K on the keyboard. The "Connection" panel will open on the right. The system will begin searching for available wireless displays. If your TV supports Miracast and is in connection standby mode, it will appear in the list. On some models Samsung or LG You must first launch the "Screen Share" or "Smart View" application on the TV itself.
After selecting a device, a confirmation message may appear on the TV screen. Use the remote to confirm the connection. The Windows desktop will then appear on the big screen. You can change the operating mode by opening the control panel again. Win + K and selecting "Change projection mode." Options include: PC screen only, duplicate, extend, or second screen only.
| Parameter | Description | Recommendation |
|---|---|---|
| Latency | Image transmission response time | Critical for games, normal for videos |
| Permission | Maximum supported quality | Depends on the power of the Wi-Fi module |
| Audio | Transmitting audio along with video | Automatically switches to TV |
If the connection is successful, the audio should also switch to the TV. If the video plays but there is no sound, check the playback settings in Windows by clicking the speaker icon in the system tray and selecting the appropriate output device.
What to do if Windows doesn't find the TV?
Make sure Miracast (also known as Screen Mirroring, Smart View, Beam, etc.) is enabled on your TV. Check that the Wi-Fi Direct driver is installed on your PC. Sometimes restarting the Windows Connection Manager service via services.msc helps.
Using Google Chrome for Chromecast and DLNA
Browser Google Chrome is a universal tool for those whose TVs don't have built-in Miracast support or whose performance is unstable. The browser supports Chromecast technology, allowing you to cast a tab or the entire desktop to any Cast-enabled device, including Android TVs and set-top boxes.
To get started, open your browser and click the three dots in the upper-right corner, then select "Save & Share" → "Cast..." In the window that opens, you'll see a list of available devices. By default, Chrome will offer to cast the current tab, but you can select "Full Screen" or "File" from the "Sources" drop-down menu.
This method is convenient because it's operating system-independent—it works equally well on Windows, macOS, and Linux. Furthermore, Chrome can stream content from sites that block direct connections, as the traffic goes through the browser. However, it's worth keeping in mind that encoding video in real time can put a strain on your computer's processor.
⚠️ Note: When casting an entire browser tab, audio is transmitted automatically. When casting the entire screen (Desktop), audio may not be transmitted depending on the OS version and drivers. To cast desktop audio in Chrome, you may need to select the "Entire Screen (Experimental)" source.
You can also launch a local media server through the Chrome menu. If you go to chrome://cast, you'll see the connection status. To play video files from your hard drive, the easiest way is to drag the file into the browser window and click the cast button, or use the built-in player.
Broadcast for Apple owners (AirPlay)
Computer users Mac and macOS laptops have native support for AirPlay technology. This is one of the most stable and high-quality wireless streaming methods. Many modern TVs from manufacturers Samsung, Sony, LG And Vizio have built-in AirPlay 2 support, eliminating the need to purchase an Apple TV set-top box.
To start mirroring, make sure your Mac and TV are connected to the same Wi-Fi network. Click the "Control Center" icon in the menu bar (the two toggle buttons) and select "Screen Mirroring." Select your TV from the list. The image from your Mac will appear on the TV screen.
In the AirPlay settings on your Mac, you can select the resolution and frame rate. For watching movies, it's best to select a mode that matches the TV's native resolution to avoid unnecessary scaling. You can also use your TV as a separate monitor by selecting "Extend Screen," allowing you to work on your laptop while watching a video on your TV.
For Windows users, the situation is more complicated. Apple doesn't officially support AirPlay, but many TV manufacturers install software emulators. If your TV doesn't detect your Mac, check your AirPlay privacy settings on the TV—it may require a manual connection code or allow access for new devices.
- 🍏 AirPlay 2 supports multi-room audio and improved buffering.
- 🔒 For security reasons, you may be asked to enter a 4-digit code displayed on the TV screen when connecting for the first time.
- 🎥 When using AirPlay for video, it's best to close unnecessary applications on your Mac to avoid jerking.
Creating a DLNA server to play files
If your goal isn't to mirror your screen, but simply to play a movie or slideshow of photos stored on your computer, DLNA technology is optimal. It doesn't burden the processor with encoding the video stream, but simply transmits raw data, which the TV decodes automatically.
In Windows 10 and 11, the media server feature is built-in, but it's often disabled by default. To enable it, go to "Settings" → "Apps" → "Apps & features" → "Advanced options" (or search for "Media streaming settings"). In the window that opens, click "Turn on media streaming."
Once enabled, you'll see a list of devices on the network. Find your TV and make sure "Allowed" is checked. Now you can launch a standard player (such as Windows Media Player or "Movies & TV"), right-click the video file, select "Cast to device," and select your TV.
There are also more advanced servers, such as Plex or JellyfinThey not only transfer the file but can also transcode it on the fly if the TV doesn't support the video format. This requires a more powerful computer but provides maximum compatibility.
⚠️ Note: DLNA and streaming settings interfaces may vary depending on your Windows version and interface updates. If you can't find the setting using standard tools, search for "Streaming" in your system settings.
Quality solution and optimization
Even with proper setup, problems may still occur. The most common ones are audio and video desync or intermittent stuttering (freezing). This almost always indicates a problem with the Wi-Fi signal. Try moving closer to the router or, conversely, moving the router closer to the TV.
If the image is choppy, try lowering the resolution of the screen being streamed. In Windows, this can be done through "Display Settings." You can also switch your router to 5 GHz-only mode to avoid interference from neighboring 2.4 GHz networks.
Another issue: the TV isn't visible in the list of devices. In this case, check your antivirus settings. They often mark your home network as "Public" and block detection. Change the network type to "Private" in your Wi-Fi connection settings.
- 🔄 Restarting the router often solves 90% of device detection problems (DLNA/Miracast).
- 📶 Using the 5 GHz band is critical for delivering 4K video without buffering.
- 🔌 Disable the VPN on your computer, as it may be hiding your PC from the TV's local network.
Why is only the video streaming and the desktop is black?
This happens due to content protection (HDCP). Some streaming services (Netflix, Kinopoisk in the browser) block screen capture via Miracast or OBS, leaving a black window. In such cases, the only solution is to use the built-in app on your Smart TV or stream via Chrome (a tab), if the service allows it.
Is it possible to transfer sound from a computer to TV speakers if an image is not needed?
Yes, in Windows 10/11, you can simply change the audio output device. Click the speaker icon in the system tray, select the up arrow, and select your TV from the list of output devices (it may be listed as a TV model or "Digital Audio"). The sound will go to the TV, and the screen will remain on the monitor.
What is the minimum Wi-Fi speed required for Full HD video?
Stable Full HD (1080p) video transmission requires a connection speed of approximately 10-15 Mbps. However, considering overhead, interference, and peak bitrates, it is recommended to have at least 50-100 Mbps of bandwidth between the router and the client.