Connecting your Xiaomi Mi TV 4A or newer models to a smartphone allows you to cast 4K movies, photos, and apps directly to the big screen. While Xiaomi’s PatchWall interface is powerful, the underlying Android TV architecture relies on the Google Home app for secure screen mirroring. In 2026, many users face discovery issues because of modern “Band Steering” on WiFi routers.
🔬 Smart TV Support: Cast Diagnostic Hub
| 🔴 Identify Casting Issue | 🔵 Hub Solution Path |
|---|---|
|
Device Not Found
Mi TV doesn’t appear in Home app.
|
Discovery Logic Fix |
|
Handshake Error
Phone connects but casting fails.
|
Reset Cast Receiver |
At asavvyweb, our technical lab led by Vangari Divya (M.Tech) has verified that most casting failures on Mi TVs are due to an mDNS handshake hang. Follow our verified diagnostic guide below to establish a permanent connection between your mobile and Mi TV.
Any model of MI Smart tv can connect to smart phone easily to your android mobile and enjoy cricket match, play pubG, or anything on your mi tv. What ever is playing on your mobile will be seen on your mi smart tv.
Method 1: Initial Setup via Google Home App (Digital Handshake)
The Google Home app is the master controller for the built-in Chromecast feature on your Mi TV.
- Download and open the Google Home app from the Play Store or App Store.
- Sign in with the same Gmail account used to set up your Mi TV.
- Tap the + (Plus) icon and select Set up device > New device.
- The app will use Bluetooth Low Energy (BLE) to scan for the TV.
- Technical Tip: If the app asks for Location access, you must tap Allow while using the app, as Android uses location data to verify local network security tokens.
Method 2: Resetting the Chromecast Built-in Receiver
If your phone connects but the screen remains black, the internal receiver app in the Mi TV kernel has crashed.
- On your Mi TV, navigate to Settings > Apps > See all apps.
- Scroll to the bottom and select Show system apps.
- Find Chromecast built-in.
- Select Clear Cache and then Force Stop.
- Restart your TV and try casting again. This forces the TV to request a fresh digital certificate from Google’s servers.
Method 3: Fixing “Device Not Found” (WiFi Band Sync)
Modern routers merge 2.4GHz and 5GHz bands into one name. If your phone is on 5G and the Mi TV is on 2.4G, they may become invisible to each other.
- Access your router settings (192.168.1.1).
- Look for a setting called AP Isolation or Wireless Isolation and turn it OFF.
- Ensure Multicast or mDNS is enabled.
- Why this works: mDNS is the protocol that tells your phone “The Mi TV is right here.” If the router blocks this traffic, the Home app will never find the device.
Casting Apps directly vs. Full Screen Mirroring
- Direct App Casting: Open YouTube, tap the Cast icon, and select your TV. This is the most stable method for 4K video.
- Screen Mirroring: Inside the Google Home app, tap on your TV name and select Cast my screen. This is best for sharing photos or non-supported apps.
Expert Diagnostic Summary
Primary Cause: mDNS / Network Discovery blocking.
Success Rate: 95% when WiFi bands are synchronized.
Expert Note: Vangari Divya recommends using a 5GHz connection for lag-free mirroring, but only if the router is within 15 feet of the Mi TV.