Modern smartphones such as Redmi 9Many TVs have powerful screens, but sometimes you want to share the pleasure of watching videos or photos with your family on a big screen. Fortunately, wireless data transfer technologies make this possible without the hassle of cables, using only your home Wi-Fi network. This is not only convenient but also eliminates the need to find adapters or HDMI cables.
The connection process depends on whether your TV is a smart TV or a regular model with a set-top box. Xiaomi and Redmi owners have built-in tools. MIUI, which greatly simplify the task. However, there are nuances related to firmware versions and TV models that must be taken into account for stable operation.
In this article, we'll take a detailed look at all available methods for streaming images, from standard system functions to using third-party software. You'll learn how to set up MiracastHow to work with protocols DLNA And what to do if standard methods fail. The main thing is to ensure both devices are on the same network, which is the foundation for a successful connection.
Preparing devices and checking the network
Before you begin setting up, you need to make sure that both devices are yours. Redmi 9 The phone and TV are connected to the same Wi-Fi network. This is critical: if the phone is connected to 4G mobile internet and the TV is connected to a home router, they won't "see" each other. It's also worth checking that the wireless connection feature, which may have different names depending on the brand, is enabled on the TV.
On your Redmi 9 smartphone, make sure Wi-Fi is enabled and active. In some cases, the system may prompt you to use mobile data if the router's signal is weak. In this case, select "Stay on Wi-Fi." Connection stability directly impacts image quality: a poor signal may cause lag or reduced video resolution.
⚠️ Attention: The Wi-Fi router's frequency can affect transmission speed. For streaming 4K or Full HD video, a 5 GHz network is preferable, as it provides higher throughput than 2.4 GHz.
Also, check if your TV's software is updated. Manufacturers frequently release patches that improve compatibility with Android mobile devices. If you have a Samsung, LG, or Sony Smart TV, go to the network settings menu and ensure that the "Casting" or "Screen Share" feature is enabled and ready to scan for new devices.
Using the built-in "Cast" feature in MIUI
shell MIUI, installed on the Redmi 9, has a built-in image output tool that doesn't require installing additional apps. This method is based on the protocol Miracast and is the easiest for most users. To activate it, pull down the notification shade and look for the "Cast" icon. If the icon isn't there, tap the pencil icon in the editing menu and drag it to a visible location.
Once enabled, your phone will begin searching for available devices on the network. A connection confirmation prompt may appear on the TV screen; accept it with the remote control. Picture quality in this mode depends on the smartphone's processor power and the Wi-Fi speed of your router. This method may introduce a slight delay for gaming, but it's ideal for viewing photos and videos.
☑️ Pre-broadcast check
It's important to note that when using built-in screencasting, your smartphone's entire screen is mirrored. This means all notifications, incoming calls, and messages will be visible on the larger screen. If you plan to watch confidential videos or work on documents, it's best to enable Do Not Disturb mode beforehand.
Why is there no sound during the broadcast?
Sometimes, when connecting via Miracast, audio may only come from your phone. This depends on whether your TV supports the protocol. Try switching the audio output mode in the casting settings on your Redmi 9 or using third-party apps that force the audio stream.
Setup via the Google Home app
If the built-in MIUI tools don't find your TV or are unstable, using the official app is a great solution. Google HomeThis method is especially effective for TVs that support Chromecast built-in or Android TV. You can download the app from the Play Market, after which you'll need to log in using the same Google account as your TV (if required).
After launching the app, tap the "+" button in the top corner and select "Set up device" -> "New device." The system will scan the network and find compatible displays. Once paired, you can cast your screen by tapping the "Cast Screen" button in the app menu. This method often provides a more stable connection and better audio synchronization.
The advantage of Google Home is the ability to control your TV directly from your phone. You can adjust the volume, pause videos, or change the input source without having to fumble for the remote. The app also lets you stream content from other apps (YouTube, Netflix) directly to your TV, without straining your smartphone's processor.
⚠️ Attention: The Google Home app interface may be updated. If you can't find the button you need, check the control layout against the latest help in the app itself or on the official Google support website.
Broadcasting via YouTube and other apps
The most popular use case is watching YouTube videos. You don't need to mirror your entire smartphone screen to do this. Simply open the YouTube app on your Redmi 9, start a video, and tap the cast icon (the rectangle with Wi-Fi waves) at the top of the player. The system will automatically suggest a list of available devices.
This method uses the protocol DLNA or Google's own protocols, which allow the TV to automatically buffer video from the internet. As a result, the smartphone uses virtually no battery or heat, acting solely as a remote control. Netflix, Spotify, Twitch, and many other media services work similarly.
If the streaming icon doesn't appear, make sure both devices are connected to the same network. Sometimes restarting the app or clearing its cache helps. It's also worth checking if AP Isolation is enabled on your router, which prevents devices on the network from seeing each other.
Using third-party apps for screen mirroring
When standard tools fail, specialized apps from the Play Market come to the rescue. The leaders in this niche are Web Video Caster, TV Cast And Screen MirroringThey can even find "old" TVs that don't support modern wireless transmission standards by installing a special receiver on the TV (if it's a Smart TV) or using a DLNA server.
For example, the Web Video Caster app lets you cast not only video files but also the contents of browser tabs. Simply open a movie site on your Redmi 9, select "Cast" from the menu, and the video starts playing on your TV. This is especially convenient for viewing content from sites that don't have an official Smart TV app.
Some apps require server installation on a computer or TV, but most modern solutions are "install and forget" solutions. When choosing an app, pay attention to ads and user ratings, as free versions often have session time limits.
| Application | Connection type | Advertising support | Best for |
|---|---|---|---|
| Google Home | Chromecast / Miracast | No | Universal broadcast |
| Web Video Caster | DLNA / Proprietary | Yes (in free) | Video from the browser |
| TV Cast (Samsung/LG) | DLNA | Eat | Specific TV brands |
| Miracast Widget | Miracast | No | Quick access |
Troubleshooting and Frequently Asked Questions
Even with proper setup, technical difficulties can still arise. One of the most common issues is audio and video desync. This is usually resolved by rebooting the router or switching your phone to a different Wi-Fi frequency. It's also worth checking that your phone isn't in power-saving mode, which could limit Wi-Fi operation in the background.
If the TV isn't visible at all in the list of available devices, try temporarily disabling your antivirus or firewall on your router, if it has such features. Sometimes resetting the network settings on the Redmi 9 helps: go to Settings → Connection and sharing → Reset Wi-Fi, mobile networks, and Bluetooth.
Why does the image lag when connected?
Lag is most often caused by low Wi-Fi speed or channel congestion. Try switching to a 5 GHz network if your router supports dual-band mode. Also, close background apps on your Redmi 9 that may be consuming data.
Is it possible to connect a phone to a TV without Wi-Fi?
Without Wi-Fi, only wired connection via a USB-C to HDMI adapter is possible. Wireless Miracast and Chromecast technologies require a local network, even if the internet is not active (only the router works).
Is the sound transmitted to the TV?
Yes, when using Miracast and Chromecast protocols, audio is transmitted automatically. If there is no sound, check the volume settings on both devices and ensure the correct audio output is selected in the app.