Modern TVs have become sophisticated multimedia centers, but their built-in browsers are often slow or don't support the required video formats. It's much more efficient to use the computing power of your desktop computer or laptop to process the video stream, transmitting the finished image to the big screen. This allows you to enjoy large 4K files without the stuttering and lag that often occurs when trying to play them directly via the TV's built-in Wi-Fi module.
There are several proven methods for achieving this goal, each with its own advantages depending on your TV model and PC operating system. We'll cover both standard Windows operating system tools and specialized software that ensures the highest data transfer quality. Choosing the right method depends on what you plan to stream: local video files or the contents of browser tabs.
The key to the stable operation of any of the described setups is the quality of the wireless network. If the router is in the next room or behind a thick concrete wall, the signal may not be strong enough to transmit a heavy video stream. Ideally, both the computer and TV should be in the same room as the router or connected to a 5 GHz frequency, which provides sufficient throughput for 4K content.
Home network and equipment requirements
Before you begin configuring your software, you need to make sure your infrastructure is ready to transmit media content. Wireless network The connection speed should be stable, as the video stream requires a constant data transfer rate without sudden ping spikes. If your router is older and only supports the 802.11n (Wi-Fi 4) standard, you may experience some lag at high bitrates.
Make sure both devices are connected to the same local network. This is a basic requirement; without it, your computer simply won't "see" the TV. Users often encounter an issue where the router broadcasts two networks with similar names (for example, "Home" and "Home_5G"), and the devices end up on different subnets, blocking detection.
⚠️ Attention: Some providers use CGNAT technology or isolate client devices from each other at the provider level. If you don't see your devices on the network, check your router settings—local data exchange should be enabled (LAN isolation should be disabled).
You can use various online services to diagnose your connection speed, but the most important thing is the internal speed between devices. Ideally, it should be at least 20-30 Mbps for comfortable viewing of FullHD content and above 50 Mbps for 4K. If the signal is weak, it makes sense to move the router closer or use Wi-Fi repeater to enhance the signal in the viewing area.
- 📡 Dual-band router: It is advisable to use the 5 GHz band to reduce interference from neighboring networks.
- 💻 Network adapter: The computer must have a working Wi-Fi module or be connected via a cable (although the topic is about WiFi, a PC is better, but in this article we are considering wireless scenarios).
- 📺 Smart TV: The TV must support DLNA or Miracast (Wi-Fi Direct) technologies.
- 🔄 Firmware update: Make sure your TV has the latest software installed to ensure network protocols work correctly.
Broadcasting via built-in Windows tools (Projection)
The fastest way to display your computer screen on a TV without installing additional software is to use Miracast technology. This feature is built in by default in Windows 10 and 11 and allows you to cast your entire desktop or extend it onto the TV screen. This is ideal for showing presentations, viewing photos, or viewing videos from websites that protect content from direct download.
To get started, find the Input or Source button on your TV remote and select "Screen Mirroring," "Miracast," or "Wireless Sharing." On your computer, press the key combination Win + KThe system will begin searching for available devices. Once your TV appears in the list, click it to connect.
Once paired, the TV will become a second monitor. You can choose "Duplicate" mode (the image will be the same on both screens) or "Extend" mode (the TV will become an extension of your desktop). To watch movies in full screen, simply drag the player window onto the TV screen and expand it.
Picture quality when using Miracast depends on the power of the Wi-Fi module. The technology compresses the video stream on the fly, so compression artifacts may be noticeable during fast-moving scenes. However, for static content or watching YouTube in a browser, it's an excellent solution that doesn't require server configuration.
Setting up a DLNA server to play files
If your goal is to play a specific video file stored on your hard drive, DLNA (Digital Living Network Alliance) technology is the best choice. Unlike Miracast, it doesn't mirror your screen; it streams the video file itself, which is then decoded by the TV. This reduces the load on your computer and often results in a more stable picture.
In Windows, this feature is implemented through "Media Streaming Settings." Go to "Control Panel" → "Network and Internet" → "Network and Sharing Center" → "Media Streaming Settings." Click "Turn on media streaming" and allow access for your TV.
Once this feature is enabled, folders containing videos (usually "Videos," "Pictures," or "Music") become available to network devices. On your TV, find the "Media Player," "Access Media from Other Devices," or similar section in the app menu (the names vary by brand: Samsung calls it "All Sources" LG —"Photo and video").
| Parameter | Description | Recommendation |
|---|---|---|
| Protocol | DLNA / UPnP | The standard for all Smart TVs |
| Video formats | MP4, MKV, AVI | Depends on TV codecs |
| Compression | Absent | Original quality |
| Control | From a PC or remote control | Conveniently with the remote control |
It's important to understand that with DLNA, the TV decodes the video itself. If the file uses a rare audio codec (such as DTS in older models) or a video codec that the TV doesn't understand, you'll see an "Unsupported format" error. In this case, the only solution is to convert the file or use a third-party transcoding server.
Using specialized media servers
Windows' built-in tools are good, but limited. For advanced users, there are media server programs such as Plex, Emby or JellyfinThey don't just transfer files; they create a beautiful library with cover art, movie descriptions, and viewing history. This turns your PC into a fully-fledged Netflix experience for home use.
The main advantage of such servers is transcoding. If the TV can't read the video format, the server on the computer will transcode the stream on the fly into a usable format. This requires a powerful processor, but guarantees that the movie will play regardless. Installation Plex Media Server It takes a few minutes: download the installer, specify the folders with your movies, and the server indexes them.
☑️ Setting up Plex Server
On the TV, you need to install the appropriate app from an app store (Smart Hub or LG Content Store). After entering the activation code (which the TV will display) in your computer browser, the devices will sync. The interface on the TV screen will look like a modern streaming service.
⚠️ Attention: Transcoding (Plex Pass or the equivalent in Emby) may be paid or require a subscription. However, basic playback (Direct Play), where the TV reads the file itself, is usually free. If your PC is underpowered, 4K transcoding may cause lag.
Broadcasting via Google Chrome browser
If you don't have a Smart TV, but you have a set-top box with Android TV or Chromecast, or the TV itself supports Google Cast technology, you can use a browser Google ChromeThis method is convenient because it allows you to stream not only files, but also entire browser tabs.
Open the Chrome browser on your computer. Make sure you're signed in to your Google account (though this isn't always strictly necessary for local casting). Click the three dots in the upper-right corner of the menu and select "Save & Share" → "Cast..."
In the window that opens, select the source: "Tab," "Full Screen," or "File." If you select "File," you can load a video from a disk, and it will play in a separate tab that will immediately be played on your TV. This is a universal method that works on almost any platform that supports Chrome.
What should I do if the "Broadcast" button is not active?
Make sure your antivirus or firewall isn't blocking Chrome's local connections. Also, make sure the devices are on the same subnet (same router IP address, e.g., 192.168.1.x).
Streaming quality through Chrome is often inferior to native apps, as the browser first renders the page and then compresses it for transmission. This places additional strain on the CPU. However, for watching online cinemas that don't have a native TV app, this is often the only option.
Solving buffering and quality issues
Even with proper settings, problems may still arise: the video stutters, breaks into squares, or pauses to buffer. First, check your Wi-Fi bandwidth usage. If someone is downloading torrents or playing online games, it may be underperforming. Try pausing other downloads.
The second common cause is overheating of the TV's or router's Wi-Fi module. When viewing large, high-resolution files for extended periods, the equipment may throttle (reduce performance). Allow the equipment to cool or ensure better ventilation.
You should also check your Windows power saving settings. The system may try to disable your Wi-Fi adapter to save power, which can cause connection drops. Go to "Device Manager" → "Network Adapters" → Your Wi-Fi Adapter → "Power Management" and uncheck "Allow the computer to turn off this device."
- 📉 Quality reduction: Try reducing the video bitrate or choosing a lower resolution file (1080p instead of 4K).
- 📡 Change channel: Switch your router to a less congested Wi-Fi channel through the admin panel settings.
- 🔌 Reboot: A simple reboot of the router often solves problems with frozen network tables.
- 🛡️ Antivirus: Temporarily disable your antivirus's firewall to check if it is blocking local traffic.
Frequently Asked Questions (FAQ)
Is it possible to connect a computer to a TV without WiFi using only USB?
No, you can't connect a PC to a TV directly via a USB cable (like a flash drive) to stream live video. USB ports on TVs are designed for reading files from storage devices or connecting peripherals, but not for receiving video from a computer. For a wired connection, use an HDMI cable.
Why doesn't the TV see the computer on the network, even though WiFi is working?
The issue is most likely with your Windows network profile. If the network is set to "Public," Windows is blocking device discovery. Go to network settings and change the profile to "Private." Also, check if network discovery is enabled in the Network and Sharing Center.
Is there any audio delay when streaming wirelessly?
Yes, latency is always present, as it takes time to encode, transmit, and decode the signal. For movies, it's unnoticeable (players can synchronize), but for games, latency can range from 100 ms to several seconds, making gaming uncomfortable.
Does this method work on older non-Smart TVs?
Directly, no. Older TVs lack the processing power and software to receive a WiFi signal and decode video. However, you can buy an external set-top box (TV Box) running Android or similar, connect it via HDMI, and then the "PC → WiFi → Set-top Box → TV" scheme will work.