Modern Smart TV technologies make it possible to create fully-fledged multimedia centers in the home by linking various devices. It's often necessary to display the same image from one TV to a second one located in another room, or simply duplicate the image without the need for unnecessary wires. Wireless transmission signal has become a standard, but the implementation of this feature depends on many factors, including the operating system of your TV and the model of your router.
Unlike a wired HDMI connection, which guarantees a stable signal, Wi-Fi connection Requires proper network configuration and an understanding of how streaming works. Many users mistakenly believe that simply enabling "Smart View" or "Screen Mirroring" is sufficient, but high-quality synchronization between two TVs often requires the use of an intermediary device or specialized software. In this article, we'll explore all the current methods for achieving this goal.
It's important to understand that connecting two TVs directly with a Wi-Fi cable (Wi-Fi Direct) in point-to-point mode to transmit video from one screen to another without going through a router is technically impossible in a typical use case. Both devices must be on the same local network, managed by a router, which will act as a traffic switch. local area network is the foundation for all the translation methods described below.
How Wireless Video Transmission Works
The basis for interaction between devices in a smart home are the DLNA and Miracast protocols. Protocol DLNA (Digital Living Network Alliance) allows you to transfer media files (photos, videos, music) from one device to another using the network as storage. In this case, the receiving TV accesses the source TV (or server) for content and plays it. This isn't real-time screen mirroring, but rather file streaming.
Technology Miracast Wi-Fi Direct works differently: it creates a channel for transmitting a real-time video stream, essentially duplicating what's happening on the source's screen. If you want the second TV to display the first one's menu, desktop, or game, this is the method you need. However, it's important to remember that transmitting a video stream over the air is extremely sensitive. susceptible to interference and connection speed.
For either setup to be successful, it's crucial that both TVs are connected to the same Wi-Fi network. If one TV is connected to the 2.4 GHz band and the other to the 5 GHz band, but both routers are sharing the same subnet, connection is possible. However, for streaming heavy video, it's better to use the 2.4 GHz band. 5 GHz, as it provides higher throughput.
⚠️ Note: If your router is configured in "Guest Network" mode for one of the devices, they may not be able to see each other due to client isolation. Make sure both TVs are connected to the main network.
Differences in operating systems also play a key role. TVs based on Tizen (Samsung), webOS (LG) or Android TV Broadcast functions may be called differently, but the principle remains the same: searching for a device on the network and requesting a connection. Understanding which protocol your pair of devices uses will help avoid unnecessary setup hassles.
Preparing equipment and network
Before setting up, make sure your infrastructure is ready to transmit the video stream. A weak Wi-Fi signal will result in constant buffering, screen artifacts, or even a complete connection loss. Ideally, the distance between the router and TVs should be minimal, or a mesh system should be used for uniform coverage.
Check the software version on both TVs. Manufacturers regularly release updates that fix bugs in network modules and communication protocols. Go to the settings menu of each device and find the section Support → Software UpdateHaving the latest firmware is the key to stability. strong work Smart functions.
☑️ Network readiness check
It's also worth paying attention to your router's security settings. Some antivirus solutions or built-in firewalls in routers can block ports needed for discovering devices on the local network (SSDP and UPnP protocols). Make sure this function is enabled. UPnP (Universal Plug and Play) is enabled in your router settings.
| Parameter | Recommended value | Impact on broadcast |
|---|---|---|
| Wi-Fi frequency | 5 GHz | High speed, less interference |
| Security protocol | WPA2/WPA3 | Stable connection without interruptions |
| UPnP | Included | Automatic device detection |
| Wi-Fi channel | Free (non-intersecting) | No delays or jerks |
Using built-in Smart TV features
Many modern TVs have built-in image transfer functions that don't require third-party apps. For example, Samsung calls this function Smart View or "Image Broadcasting", in LG - Screen ShareIf you have two TVs of the same brand, the likelihood of a successful connection is significantly higher thanks to the use of proprietary protocols.
To start broadcasting, you need to launch the signal receiving app on the receiving TV. It's usually called "Broadcast" or "Screen Share." Once launched, the TV will go into standby mode and display the name of the device on the network. On the source TV, open the signal source or connection settings menu and select the detected device.
However, if the TVs are from different brands (for example, Samsung and Sony), built-in methods may not work due to ecosystem incompatibility. In this case, Android TV may see the Samsung as a DLNA device, but not as a mirroring screen. This is where universal standards or third-party apps come in.
Why can't the TV see another TV?
The problem often stems from one device being connected via Ethernet and the other via Wi-Fi, and the router is isolating wireless clients from wired ones (AP Isolation). Check your router settings and disable client isolation if it's enabled.
Please remember that when using built-in features, picture quality may automatically decrease as the signal deteriorates. Some TV models force a reduction bitrate video to avoid audio and video desynchronization. This is normal behavior of the anti-freeze system.
Screen Mirroring Apps
When standard tools are not enough, specialized applications installed from the store come to the rescue. Google Play or LG Content StoreOne of the most popular solutions is the "AirScreen" or "AirPin" app. It turns your TV into a fully-fledged receiver for AirPlay, Miracast, and Google Cast signals.
By installing such an app on your TV, you create a virtual access point that the source TV (if it's running Android) or any other device can connect to. This method is often more stable than built-in tools, as the app is optimized specifically for receiving streams.
- 📺 AirScreen — a universal solution for Android TV that supports multiple protocols.
- 📡 TV Cast — specializes in transferring video from a browser or gallery.
- 🔗 LocalCast — a powerful tool for streaming files over a local network.
- 🍏 AirPlay — native support for Apple devices, often built into new TV models.
It's important to note that installing third-party software may consume additional resources on your TV's processor. If your device is underpowered, you may experience stuttering when playing high-definition (4K) video. In this case, it's best to reduce the quality of the original stream or use a wired connection for one of the devices.
⚠️ Please note: Free versions of streaming apps often have time limits or display ads. For continuous use, consider purchasing a license to avoid interruptions while watching.
Setting up a DLNA server for multimedia
If your goal isn't to mirror your screen in real time, but simply to show a movie or photo stored on the first TV on the second TV, it's better to use DLNA. In this case, the first TV (or the hard drive connected to it) acts as a media server. The second TV simply accesses it as a network folder.
To implement this scheme, a server program must be installed on the source TV, if it is not built into the system. On Android TV, you can use the app Server for DLNA Or a built-in file manager with network access. After the server starts, a new folder with content will appear on the local network.
On the receiving TV, open the "Media," "Gallery," or "Video" app and select "Devices" or "Network" as the signal source. The server name will be displayed. By accessing it, you'll gain access to the file system of the first TV. This is a great way to set up a lag-free home theater, as buffering occurs in advance.
The advantage of DLNA is that playback control (pause, rewind) is controlled using the receiving TV's remote control, which is very convenient. Furthermore, this method doesn't overload the Wi-Fi channel with a constant video stream, but only transmits the data for a specific file.
Latency and image quality issues
The most common problem with wireless transmission is lag (latency). This can be critical when playing games or watching fast-paced sports. Latency occurs due to the time required to encode the video stream at the source, transmit data packets over the air, and decode it at the receiver.
To minimize lag, try changing the resolution of the streamed image. If you're streaming from an Android set-top box or phone to a TV, you can often select the quality in the streaming settings. Downscaling from 4K to 1080p can dramatically improve smoothness.
It's also worth checking whether your Wi-Fi channel is overloaded by neighboring networks. Using Wi-Fi analyzers (e.g., WiFi Analyzer) will help you find a free channel. Switching your router to a less congested channel can significantly improve connection stability.
If latency remains high, your router may be unable to handle multicast traffic. In such cases, rebooting the router or, as a last resort, using a wired connection (Ethernet) for at least one TV to reduce the bandwidth congestion can help.
Alternative methods: HDMI and external adapters
If software methods don't produce the desired result, there's always the hardware option. Using adapters HDMI Wi-Fi (such as AnyCast or Miracast dongles) allows you to turn any TV with an HDMI port into a wireless signal receiver. These devices connect directly to the HDMI port and handle all the decoding.
This adapter can be plugged into a second TV, and the first (source) TV will connect to it like a regular wireless display. This is often more stable than the built-in Smart features of older TVs, as the adapters have their own processor and RAM.
Additionally, there are special HDMI splitters with IP extender support that allow signal transmission over a local network (twisted pair), but this is a professional-grade solution that requires the purchase of additional equipment for each point.
In conclusion, it's worth noting that achieving a perfect, lag-free picture over Wi-Fi is always a compromise. Built-in tools and apps are usually sufficient for home use, but for professional applications, it's better to consider wired solutions or specialized video wall systems.
Is it possible to transmit an image directly without a router?
Technically, using Wi-Fi Direct technology, some devices can connect directly. However, TVs rarely support a mode where one TV broadcasts Wi-Fi and the other connects to it to receive video. Wi-Fi Direct is typically used to connect smartphones to TVs. A router is almost always required for a TV-to-TV connection.
Why is there a picture but no sound?
This is a common issue with codecs or protocol settings. Try changing the audio format in the broadcast app settings (for example, from Surround to Stereo) or updating the codecs on the receiving TV. Also, check if the second TV is set to "Video Only" mode.
Does internet speed affect transmission between TVs?
No, unless you're streaming online video. When transmitting images from one TV to another over a local network (DLNA/Miracast), the internet connection isn't used; traffic flows only within your home network through the router. Internet speed may drop if the router is weak and can't handle the load.
Does my TV support picture transmission?
Almost all Smart TVs released after 2015 have built-in modules for this. Check the manual or network menu for Miracast, AirPlay 2, or DLNA icons. If you have a regular (non-Smart) TV, you'll need an external set-top box.