Why the wireless display on the Xiaomi phone does not turn on: diagnostics and solutions

Modern smartphones Xiaomi, Redmi and Poco are equipped with powerful multimedia functionality that allows you to broadcast an image from the screen to the TV or monitor through Miracast technology. Users often face a situation when the projection function stops working: the phone does not see the receiver, the connection breaks immediately after installation or the activation button does not respond to pressing. This can be caused by software conflicts, energy saving settings or problems in the network module.

In most cases, the problem lies in protocol incompatibility or a banal failure of Google Cast services. Android, on which the MIUI or HyperOS shell is based, requires a stable communication channel and certain permissions to transmit a high-definition video stream. If the basic network settings are downed, the wireless display module simply will not be able to initialize the connection to an external device.

In this article, we will take a closer look at all the possible causes of a feature failure and offer step-by-step instructions for restoring functionality, learn how to properly configure a router, what hidden parameters can block data transmission, and why a complete network reset is sometimes required to fix the error.

Main reasons for failure of screen projection function

The first thing to check is the physical location of the devices and the state of the network equipment. Wireless video streaming technology is extremely sensitive to the quality of the Wi-Fi signal. If your router is running in an overloaded range or has outdated firmware, data packets can be lost, which leads to the impossibility of connection. Often users forget that for Miracast to work, both devices must be on the same subnet.

The second common reason is the limitations imposed by the Android operating system itself or MIUI security mechanisms. Some applications, especially streaming services like Netflix or online cinemas, use HDCP content protection technology. This protection blocks the transmission of images to uncertified (uncertified) devices or through standard projection tools if the content is marked as protected.

Hardware constraints are also worth considering: In Xiaomi’s budget smartphones, the Wi-Fi module can be single-threaded, which prevents both Internet and high-bitrate video streams from being transmitted simultaneously without delay, in which case the system can force the wireless display function to be disabled to keep the phone stable.

⚠️ Note: If you use a guest Wi-Fi network or a client isolation network, the wireless display will not work because the devices on the network cannot see each other.

Finally, the reason could be a conflict of protocol versions: Older TVs can only support Miracast 1.0, while newer Xiaomi smartphones use more recent standards for encoding the video stream, in which case direct connection is impossible without the use of an intermediate adapter.

Checking network settings and router

The foundation for a wireless display is the right local network configuration. Make sure your Xiaomi smartphone and TV (or TV set-top box) are connected to the same network. Often, the router broadcasts two networks: 2.4 GHz and 5 GHz. If one device sits on the same frequency and the other on the other, but they are on different VLANs or subnets, detection may not work.

You need to check your router settings for the enabled AP Isolation feature, which is designed for security in public places and prevents devices within the network from communicating with each other. For a home network that requires a screen projection, this option should be disabled in the router settings.

It also makes sense to reboot network equipment. Routers that work for months without interruption can accumulate errors in the ARP table and DNS cache, which prevents correct device search on the local network. Simply turning off the router power for 10-15 seconds often solves the problem of “invisibility” of the TV.

• 📶 Make sure both devices have Wi-Fi and Bluetooth enabled (Bluetooth is often used for primary handshakes of devices).
• 🔒 Check the type of network security: it is recommended to use WPA2-PSK or WPA3, old-fashioned WEP It may not be supported by new modules.
• 🔄 Try to temporarily disconnect. VPN on the phone, as virtual tunnels can redirect traffic and hide local devices.

If the problem persists after checking all the parameters, it may be the router drivers or its poor performance when processing multicast traffic, which is used to detect devices.

MIUI and HyperOS settings: hidden settings

MIUI and HyperOS shells have an aggressive power management system that can "kill" the background processes required for a wireless display to run. First of all, check if the data limit for system services is worth it. Go to Settings → Applications → All applications and find system processes related to projection or Wi-Fi Display.

An important parameter is the permission to display over other windows. Without this right, Android security blocks the capture of the image from the screen to be transmitted to an external display. It is also worth checking the Developer Options settings if you have them activated.

In the developer menu, we're interested in the "Wireless Display Certification" option, if it's on, try turning it off or on the other hand, because different versions of firmware use this option differently, and you can also try resetting Bluetooth and Wi-Fi settings through a special menu.

⚠️ Note: Changing the settings in the Developer Menu may affect the stability of the system. Remember or photograph the original values before making changes.

Another nuance is Flight Mode, which sometimes causes the Wi-Fi module to freeze in an error state, and turning on the flight mode for 10 seconds and then turning it off restarts the radio module, which can restore the protocol stack to work properly.

Step-by-step instructions for the inclusion of the broadcast

To run the function correctly, follow a strict algorithm of actions. First, make sure that the TV is on and in standby mode (often you need to run the Screen Share, Miracast or Translation application on the TV itself).

On a Xiaomi smartphone, open the notification curtain and find the Translation icon (may be called Cast, Wireless Monitor, or Projection). If the icon is not there, click on the pencil (menu editing) and add it. Once you start the search, the phone will start scanning the network.

If you find a device, click on it. You may see a request for permission on your TV screen -- confirm it with the remote. It takes 3 to 10 seconds to pair.