Modern users often face the challenge of bringing their smartphone contents to the big screen to watch a movie, showcase photos or play a game. For owners of budget-friendly but reliable devices like the Xiaomi Redmi 7A, this process can seem daunting due to the lack of support for some advanced video transmission technologies.
Unlike the flagship models equipped with USB Type-C ports with support for the DisplayPort standard, the Redmi 7A uses an older Micro-USB connector. This technical limitation means that a direct connection of the USB-to-HDMI cable to transmit a video signal will not work in 99% of cases.
However, the connection through USB-cable is still possible, but it requires the use of software methods such as debugging. USB and special projector applications, or the use of TVs with Smart function TV protocol support MHL In this article, we will discuss in detail all the nuances that will allow you to broadcast an image despite the limitations of budget hardware.
Technical limitations of the Micro-USB interface on Redmi 7A
Before you start setting up, you need to clearly understand the architecture of your device. Xiaomi Redmi 7A is based on the Qualcomm Snapdragon 439 processor, which does not support MHL (Mobile High-Definition Link) or SlimPort technology at the hardware level through a standard charging port. This means that buying a cheap adapter at the nearest electronics store will likely only lead to charging the phone, but not to the appearance of the picture on the screen.
Many users mistakenly believe that any USB cable can transmit a video signal if connected to the HDMI port of a TV. In reality, such adapters require active electronics inside the smartphone itself, which converts the digital signal into a video stream. On Redmi 7A, this feature is programmatically and physically blocked by the manufacturer to reduce the cost of the device.
⚠️ Warning: Don't try to use random USB-to-HDMI adapter cables bought at Chinese sites without checking compatibility.At best, nothing will happen, at worst - a power surge can damage your Redmi's power controller 7A.
Are there exceptions? In theory, there are external adapters that run through the application and use the processing power of the processor to encode video, but they require USB connectivity and often have a huge latency. For the Redmi 7A, the most stable option is to use software solutions in conjunction with Wi-Fi, but if you insist on a wired connection via USB, we will have to use debugging mode.
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Direct transmission of video signal through USB-cable 7A hardware not supported, software crutches or alternative connection methods are required.
Preparation of equipment and software
To implement a wired connection, you will need not only the smartphone and the TV itself, but also a number of additional components. The quality of the cable is critical: cheap cords often do not withstand long data transfers and can interrupt the connection at the most inopportune moment. Make sure that your cable supports data transfer, not just charging.
You will also need a computer with drivers installed. ADB (Android Debug Bridge, if you plan to use deep customization techniques, or a dedicated app on the TV itself if it runs Android TV. For owners of ordinary LED-panels without "smart" functions, the situation is complicated, and the only option is the use of external consoles.
- 📱 Smartphone Xiaomi Redmi 7A battery-charged at least 50%.
- 🔌 High-quality Micro-USB cable with data transfer support (not only charging).
- 📺 Port TV HDMI or USB (for media files) or a Smart function.
- 💻 PC (optional) for installing drivers ADB, if manual adjustment is required.
It’s important to check the operating system version on your device. Redmi 7A originally shipped with Android 9 Pie and the MIUI 10 shell, but could be upgraded to newer versions. The developer’s settings interface may vary slightly depending on the MIUI version, so be careful when looking for the right menu items.
☑️ Checking connection readiness
Activation of the developer mode and debugging via USB
The key to setting up a wired connection is to get advanced permissions to access the phone's system functions. Xiaomi's standard interface hides these settings from the average user to prevent accidental system breakdown. We need to activate the hidden "Developers" menu.
To do this, go to the settings menu and find the "About Phone" item. MIUI" and press it fast. 7-10 After a few clicks, the system will alert you to becoming a developer, and then a notification will appear.
Once activated, go back to the main settings menu, scroll down to "Additional" or "Extended Settings" and there you will find a new "Developers" item. When you enter, find the "Debug USB" switch and activate it. The system will issue a risk warning, confirm the action.
⚠️ Warning: When connecting your phone to a new device (TV or PC) on a Redmi screen 7A You'll see a request for debugging permission. Make sure you check the box "Always allow from this computer" and click "OK" or the connection won't be established.
There is another important parameter in this menu: "Configuration". USB Default. Click on it and select "File Transfer" mode (MTP)" or "USB-audio" if this option is available, it will force the phone to offer the desired mode of operation immediately when the cable is connected, without unnecessary confirmations.
What if the “Developers” item does not appear?
Using projector applications through USB-linkage
Since there is no hardware support for the video output, we will turn to software solutions. There is a class of applications that create a virtual display and transmit its contents through the virtual display. USB-A channel using protocols that emulate a network connection or specific drivers. One popular solution is to use a bundle of applications such as ApowerMirror or analogues that support a wired connection.
The process of setting up is this: a receiving app is installed on a TV (if it is an Android TV) or a console connected to it; a client part is installed on a Redmi 7A; the devices are then connected by a cable; and it is important to note that many of these programs will still need to activate the USB debugging that was mentioned above.
The advantage of this method is that the image latency is minimal compared to a wireless connection, and the picture does not depend on the quality of the Wi-Fi signal. However, it is worth considering the load on the Snapdragon 439 processor. Real-time video encoding can cause heating of the case and increased energy consumption.
| Annex | Type of connection | Delay. | Demands a Root. |
|---|---|---|---|
| ApowerMirror | USB / Wi-Fi | Low (USB) | No. |
| TeamViewer QuickSupport | Internet (via USB-modem) | Medium | No. |
| Scrcpy (for PC) | USB (ADB) | Minimum | No. |
| LetView | USB / Wi-Fi | Low. | No. |
If your TV doesn't support app installation, you can connect a laptop or PC to it, and connect Redmi 7A to your computer via USB using a projector program on your computer, which will create a bridge between your phone and the big screen.
Alternative: Regime USB-modem
An interesting way to work around is to use the phone in mode USB-Modem to create a local network between Redmi 7A And then you can use a TV set, if the router is unstable, and although this is not a direct transmission of video over the cable, it solves the problem of buoyant wireless connectivity.
Turn on Screen Mirroring or AnyView Cast on your TV. Go to Settings on your phone → Connection and sharing → Wi-Fi hotspot. However, to use the cable, include the same menu item USB-modem after connecting the cable to a TV set-top box or router with support USB-network.
This method allows you to transfer the Internet from your phone to your display device via cable, providing a stable channel for streaming video through standard Cast protocols. This is especially true if your router is far away and the Redmi 7A Wi-Fi module can’t handle the high-resolution stream.
- 🔗 Connect the Micro-USB cable to your phone and USB-router-port.
- ⚙️ Activate. USB-modem in phone settings.
- 📡 Make sure that the devices are on the same subnet.
- 📺 Run the screen broadcast through the standard menu MIUI.
This approach is often ignored by users, but it allows you to significantly reduce ping and remove compression artifacts when watching online video from your phone on TV.
Transfer of multimedia files via USB
If your goal is not to broadcast the screen in real time, but to show the photos or videos stored in memory, the problem is much easier. You don't need complex applications. You just need to switch the phone to storage mode.
Get Redmi on board. 7A ce USB-port of the TV (if it supports reading files from external devices, the function USB On the screen of the smartphone will appear a notification about the mode of operation USB. Click on it and select File Transfer or FTP. Television will define your phone as an external hard drive.
Using the TV remote, go to the Media or Files menu, select the connected device, and find the content folder. Usually, photos and videos are stored in DCIM, Pictures or Download folders, which ensures maximum image quality, since the file is read directly without recoding.
⚠️ Attention: The phone's file system must be compatible with the TV. Most TVs read. FAT32 and NTFS. If the phone offers to format the card or internal memory for a specific format, refuse this so as not to lose data.
For large-sized video files (over 4GB), make sure they are not broken down and the TV supports a playback codec. Redmi 7A can store video in a format that the TV's built-in player doesn't "understand." In that case, use third-party players on Smart TVs, such as VLC, if the platform allows them to be installed.
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Use a file manager with a function FTP-servers on a phone (e.g. Mi File Manager) to transfer files to the TV over a local network wirelessly, but at high speed.