Modern video viewing is rarely limited to the screen of a smartphone or tablet. Video broadcast on a large display allows you to immerse yourself in the atmosphere of a movie or music video while maintaining a comfortable distance from the screen. Wireless data transmission technology via Wi-Fi HDMI has become a standard, freeing users from unnecessary wires and complex HDMI cable setups. However, despite its apparent simplicity, the process of connecting a mobile device to a TV often raises questions, especially when dealing with different operating systems and TV models.
The basis for convenient broadcasting is the protocol DLNA or proprietary technology Google Cast, built into most modern applications. For the process to start successfully, it's critical that both devices—the signal source (smartphone, tablet, laptop) and the receiver (TV)—are on the same local network. Transferring traffic via 4G/5G mobile internet is not possible with the built-in "Broadcast" function; devices must be connected to the same router. This is a fundamental requirement, the violation of which makes it impossible for devices to discover each other.
In this guide, we'll detail all the connection details, examine possible errors, and offer alternative solutions for older TV models. You'll learn how to control playback from your phone, turning it into a remote control, and understand why picture quality may differ from the original. The availability of your home network infrastructure is just as important as the app's settings.
Technical requirements and equipment preparation
Before you begin setting up, you need to make sure your equipment is compatible. Most modern TVs with the feature Smart TV have built-in Wi-Fi and support for streaming protocols. If your TV is less than 7-8 years old, the likelihood of having the necessary features approaches 90%. Otherwise, you will need to purchase an external set-top box, such as Chromecast, Apple TV or Android box.
A stable wireless network is key. Streaming high-resolution video (Full HD or 4K) requires a stable connection. Wi-Fi congestion from neighboring networks or running torrents can lead to constant buffering and reduced image quality. Router must support at least 802.11n standards, and ideally 802.11ac (Wi-Fi 5) or ax (Wi-Fi 6) to operate in the 5 GHz band.
Check your software for updates. Manufacturers regularly release patches that improve the stability of network modules and applications. Go to the TV menu and find the section Settings → Support → Software Update and initiate a search for new versions. On your smartphone, you should also check for updates to the YouTube app and Google Play Services.
Setting up Smart TV and connecting to the network
The first step is to ensure your TV is physically connected to your wireless network. Even if your TV supports Wi-Fi Direct, to stream internet content, it's best for both devices to be on the same subnet of your home router. Go to your TV's main menu and select Settings → Network → Network settingsSelect your home Wi-Fi from the list of available networks.
Enter your network password. Pay attention to the keyboard layout on your TV screen, as it's very easy to enter a character incorrectly. Once successfully connected, your TV will receive an IP address from the router. Make sure your smartphone or tablet is connected to to the same one SSID (network name). Routers in homes often broadcast two networks: 2.4 GHz and 5 GHz. Although modern routers can combine them, sometimes devices only see each other when connected to the same frequencies.
An important step is activating the broadcast reception function. This option may be called differently on TVs from different brands. On Samsung TVs, it may be Smart View, LG has — Screen Share, and in Android TV, the feature is built into the system. Sometimes you need to launch a special app on your TV, such as YouTube or Media Player, to make the device visible to external sources.
Broadcast via the YouTube app on your smartphone
The easiest and most popular way to display a video on the big screen is to use the built-in feature within the YouTube app. This method doesn't require any additional software and works with your Google account. Open the YouTube app on your smartphone (Android or iOS) and find the video you want to watch. You'll see the icon in the upper-right corner of the video player or in the playback controls. Broadcast (rectangle with waves in the corner).
Click this icon. The app will begin searching for available devices on your local network. Within a few seconds, your TV should appear in the list. The device name usually matches the TV model or the name you gave it during initial setup. For example, Living Room TV or LG OLED55.
☑️ Pre-broadcast check
Once you select a device, the video will begin playing on your TV screen. Your smartphone will then become a remote control. You can pause, rewind, change the volume, or select the next video in the queue, and all changes will be instantly reflected on the TV. This means you can minimize the YouTube app on your phone and do other things, such as checking email, without interrupting playback.
⚠️ Note: If the broadcast icon is grayed out or devices are not detected, try rebooting your router. Sometimes DNS cache or IP address assignment errors can block device detection on the local network.
Using Screen Mirroring
If YouTube's built-in feature isn't working for some reason, or you want to show content that isn't available in the app (for example, a video from your gallery or another video player), you can use screen mirroring. This method transmits an exact copy of your smartphone's display to your TV. On Android, this feature is often called Smart View, Transmit or "Wireless Monitor." On iOS, it's called "Screen Mirroring" (AirPlay).
To activate it, pull down the notification shade on your smartphone and find the corresponding icon. On Android 10 and above, it may be hidden in the quick settings menu (the button with three dots or a pencil). After turning it on, the phone will begin searching for displays. Select your TV from the list. A connection confirmation prompt may appear on the TV screen; use the remote to confirm.
Unlike live streaming via YouTube, screen mirroring doesn't allow you to use your phone for other tasks. Everything you do on your smartphone (incoming messages, notifications, menu navigation) will be visible on the larger screen. Furthermore, this method puts a heavy load on the phone's processor and battery, and can lead to audio and video desyncing if the Wi-Fi signal is weak.
Why are there black bars on the sides when broadcasting a screen?
The aspect ratio of a smartphone screen (usually 19:9 or 20:9) differs from that of a television (16:9). A television cannot stretch the image without distortion, so it adds black borders.
Troubleshooting connection and buffering issues
Despite the technology's refinement, users often encounter issues. The most common is that the TV doesn't appear in the list of available devices. Make sure "AP Isolation" isn't enabled on your router. This setting prevents devices connected to Wi-Fi from communicating with each other, which is necessary for Chromecast and DLNA to work.
The second common issue is poor image quality or a constant loading (spinning indicator). This indicates insufficient bandwidth. If the router is far from the TV, the signal may be unstable. Try moving the router closer or using a Wi-Fi extender. Also, check if anyone on the network is downloading large files.
| Problem | Possible cause | Solution method |
|---|---|---|
| The TV is not visible in the list | Different Wi-Fi networks | Check that the phone and TV are on the same SSID |
| The video is lagging | Weak Wi-Fi signal | Move your router closer or switch to 5 GHz |
| There is no sound on the TV | Incorrect audio output | In the YouTube app, click on the audio settings and select TV. |
| Black screen during broadcast | DRM content protection | Some paid videos cannot be streamed on PC/old TVs |
Alternative methods for old TVs
If your TV doesn't have Smart TV functionality or it's not working properly, don't despair. There are several ways to upgrade your device. The most reliable option is to purchase a media set-top box. Android TV Box or Apple TV They connect via HDMI and add all the features of a modern smartphone to your TV, including app installation and Wi-Fi connectivity.
A more budget-friendly option is to use an HDMI cable connected to a laptop or adapters like MHL (If your phone supports video output). However, this is no longer a wireless solution. You can also use game consoles (PlayStation, Xbox), which have a built-in YouTube app and can receive streams over Wi-Fi, just like a Smart TV.
For Apple device owners, purchasing an original adapter is an excellent solution. Lightning to HDMI or USB-C to HDMIThis will ensure the transmission of a digital signal without delays or compression, which is critical for viewing high-bitrate video. Image quality in this case will depend solely on the capabilities of the TV's display.
⚠️ Note: Interfaces and menu item names may vary depending on your TV's operating system version (Tizen, WebOS, Android TV). If you don't see the option described, please refer to the official documentation from your model's manufacturer.
Frequently Asked Questions (FAQ)
Is it possible to stream YouTube videos to a TV without the Internet, only via Wi-Fi?
Yes, this is possible if the video is already downloaded to the app cache on your phone (YouTube Premium feature) or if you're using a local media server (DLNA). However, an internet connection is usually required for initial authorization and device search.
Why does the sound only come from the phone and not from the TV when broadcasting a video?
You likely didn't select an audio output device when playback started. Click the cast icon again and make sure your TV's name is selected, not "This Phone." Also, check your Bluetooth settings; sometimes the sound switches to connected headphones.
Does a low phone battery affect streaming quality?
Battery drain doesn't directly affect image quality, but some smartphones may limit Wi-Fi power when the battery is low (less than 15-20%) to conserve energy, which can lead to connection drops. Furthermore, power saving mode may block background app activity.
Does my old TV support Wi-Fi streaming?
If your TV doesn't have a built-in Smart TV or Wi-Fi Direct/Miracast feature, it won't be able to stream directly. You'll need an external device, such as a Chromecast or Android set-top box, that will receive the Wi-Fi signal and transmit the image to the screen via HDMI.