Modern technology has allowed us to do away with bulky cables and enjoy content on the big screen without the hassle of wires. broadcast video Casting from a laptop or desktop PC to a TV has become a standard, significantly simplifying the viewing of movies, educational videos, and music videos. However, despite its apparent simplicity, the setup process often raises questions among users, especially when devices don't recognize each other or the picture quality leaves much to be desired.
In this article, we will examine in detail all the current methods of image transmission, based on the operation of a local network. Wi-FiYou'll learn how to use built-in operating system features, browser capabilities, and third-party apps to achieve perfect synchronization. Understanding how data transfer protocols work will help you avoid common mistakes and enjoy content in the highest quality.
Before moving on to specific instructions, it's worth noting that a successful connection directly depends on your home network configuration. If your router is unstable or your devices are too far apart, even the most accurate software settings won't help. Therefore, the first step should always be to troubleshoot the connection and ensure both devices are on the same subnet.
Technical requirements and equipment preparation
The foundation for any wireless broadcast is a stable local network. For the technology to work properly, DLNA or protocol Google Cast It's critical that both the computer and TV are connected to the same router. A common mistake is when the laptop is connected to a guest Wi-Fi network or via a 3G/4G modem, while the TV is connected to the router's main band.
Bandwidth should also be taken into account. To transmit video in resolution 4K requires high data transfer rates, which the old standard 802.11n may not provide stable performance. In such cases, it is recommended to use a range 5 GHz, if your router and TV support this frequency. This will prevent buffering and image tearing while watching.
Also check your TV's software. For owners Smart TV You need to make sure that the operating system (whether it is Android TV, WebOS or Tizen) has been updated to the latest version. Outdated firmware versions often contain bugs that prevent devices from being detected on the network or correctly decoding video streams.
⚠️ Important: If your router has a "Guest Network" feature, make sure it doesn't isolate clients from each other. In Access Point Isolation mode, devices connected to the Wi-Fi network cannot see each other, making broadcasting impossible.
Using the built-in "Cast" feature in the Google Chrome browser
The most universal and simple method, which does not require installing additional software, is to use the built-in functionality of the browser Google ChromeThis method is based on technology Chromecast built-in, which is supported by most modern TVs. You don't need to search for special drivers or complicated settings; all you need is a Google account and an open browser.
To start the broadcast, open your browser and go to the website YouTubeIn the upper right corner of the browser interface (or within the YouTube video player itself), look for the rectangle icon with waves, which represents the "Cast" function. Clicking it will display a list of available devices on your network. Select your TV from the list, and the video will instantly begin playing on the big screen.
The advantage of this method is that the computer acts only as a remote control. Once playback starts, you can close the browser tab or even turn off the PC monitor—the video will continue playing, as the stream is sent directly from YouTube servers to the TV via the internet, not through the computer.
However, it's worth keeping in mind some nuances when working through a browser. Image quality may be limited by the browser's capabilities and the codecs it uses for rendering. Furthermore, if you're using a laptop with a dead battery, actively transmitting data over Wi-Fi can significantly speed up battery drain, although to a lesser extent than when using heavy applications.
Streaming via the YouTube app on a Smart TV
The highest quality and most stable viewing experience is to use the native app. YouTube, installed directly on the TV. In this case, your computer is used exclusively for content selection and playback queue management, which relieves the load on the PC processor and ensures the highest image quality supported by the TV.
The pairing process is extremely simple and doesn't require entering passwords or IP addresses. Open the YouTube app on your TV and go to Settings (usually the gear icon). Select Watch on TV or Connect the codeA unique alphanumeric code will appear on the screen, which must be entered on the computer.
On your computer, go to YouTube and click the streaming icon (the rectangle with waves) in the video player or in the website header. Select "Enter code manually" from the menu, or simply select your TV from the list if it's visible. Once the connection is confirmed, all videos played on your PC will be instantly streamed to your TV.
☑️ Checklist for successful pairing
Importantly, this method allows you to create complex playlists and control playback from any device in your home signed in to your Google account. You can start watching a video on your phone, continue on your tablet, and finish on your TV, all while maintaining the same playback position.
| Parameter | Via browser (Cast) | Via code (Link TV) | Mircasting screen |
|---|---|---|---|
| Video quality | Up to 1080p/4K | Up to 8K (depending on TV) | Depends on Wi-Fi signal |
| PC load | Minimum | Absent | High |
| Stability | High | Maximum | Average |
| Control | Complete | Complete | Full screen control |
Screen mirroring (Miracast and WiDi)
If you need to display not only YouTube videos on your TV, but also your entire desktop, Start menu, or other applications that don't have the Cast feature, you should use screen mirroring technology. Windows This function is implemented through protocols Miracast And WiDi (Wireless Display). This allows you to broadcast a video signal in real time, creating a second monitor.
To activate this feature on a Windows 10 or 11 computer, press the key combination Win + KThe system will begin searching for available wireless displays. If your TV supports "Screen Mirroring," "Casting," or "Wireless Display," it will appear in the list. After selecting a device, the image from your PC monitor will appear on the TV.
It's worth keeping in mind that this method places a significantly higher load on the wireless network and computer processor, as the video stream is encoded on the fly. Latency with this connection can range from 0.5 to 2 seconds, making it unsuitable for gaming, but perfectly acceptable for watching videos or presentations.
⚠️ Note: When mirroring your screen, your desktop resolution may automatically change. If the image on your TV is cropped or stretched, please go to
Settings → System → Displayand set the recommended resolution for your TV (usually1920x1080or3840x2160).
Troubleshooting connection and buffering issues
Even with proper setup, users may encounter issues: video stutters, audio lags behind the picture, or the TV stops detecting the computer. Most often, the cause is radio channel congestion. If there are many neighboring Wi-Fi networks nearby, they create interference, reducing the actual data transfer speed.
Try rebooting your router by unplugging it for 10-15 seconds. This will allow the device to select a less congested channel. Temporarily disabling VPN services and proxy servers on your computer is also effective, as they can redirect traffic through remote servers, blocking local communication between devices.
The secret to a stable connection
If your router is dual-band, try connecting your TV to the 5 GHz network and leaving your computer on 2.4 GHz (or vice versa), but make sure that the router settings allow interaction between clients of different bands (AP Isolation is disabled).
If the issue only occurs with heavy 4K content, manually reduce the video quality in the YouTube player settings to 1080p. Sometimes the automatic quality selection mistakenly sets the maximum values that your current Wi-Fi signal simply can't handle without packet loss.
Alternative methods and third-party software
In cases where standard methods don't work or the functionality isn't sufficient, you can resort to third-party programs. For example, a media player VLC has a built-in rendering function that allows you to transfer video files and streams to UPnP/DLNA compatible devices, which include most Smart TVs.
To do this, open VLC, go to the menu Playback → Render and select your TV. There are also specialized utilities for managing media libraries, such as Plex or Kodi, which provide a convenient interface for accessing video files on a computer from a TV.
Another option is to use HDMI adapters such as Google Chromecast or Amazon Fire TV StickIf your TV doesn't have Smart features, these devices connect to the HDMI port and create an entry point for wireless streaming, working on the same principles as built-in Smart TV systems.
Why doesn't the TV see the computer in the list of devices?
Check if network discovery is enabled in Windows settings. Go to Control Panel → Network and Sharing Center → Change advanced sharing settings and make sure network discovery is enabled. Your antivirus software may also be blocking the connection—try temporarily disabling your firewall.
Is it possible to transmit video without the Internet, only via a local network?
Yes, if you're using DLNA, Miracast, or a local server (Plex), internet access is not required. Simply having the router connect the devices to a local network is sufficient. However, for online YouTube, internet access is required on the TV or streaming device.
Does streaming video affect internet speed for other devices?
When using Chromecast (where the TV downloads video automatically), this has virtually no impact, as the traffic goes directly to the TV. When using screen mirroring (Miracast) or when the computer acts as a gateway, the load on the Wi-Fi channel increases, which can reduce speeds on other devices.