The situation when you connect your Xiaomi or Redmi smartphone to your TV via USB-The cable, and the screen stays black or gives a "No signal" error, is quite common. Users expect the device to automatically be identified as an external drive, allowing them to view photos and videos on the big screen, but instead receive only a charging notification. This is due to the Android operating system and security settings that block access to the file system by default when connecting to external devices.
The problem isn't with a cable or a port malfunction, but with how modern smartphones control connections. Unlike older push-button phones, modern gadgets don't give data back immediately after you connect. The default USB mode in MIUI and HyperOS is always set to Charge Only, which requires manual user intervention to activate data transfer. Without this step, the TV won't be able to physically "see" the contents of your device's memory.
In this article, we will look at all the possible reasons why the TV can’t see the phone, and offer step-by-step solutions for models from different manufacturers. We will discuss the issues of choosing the right cables, setting debugging modes and alternative broadcasting methods if wired connection is not possible.
The main reasons for the lack of signal between the phone and TV
The first thing that a user encounters is the lack of TV response. Most often the reason is trivial: the TV simply does not support the function of reading files from connected smartphones via a USB port. Many modern Smart TVs, especially budget models, have USB ports designed exclusively for maintenance (Service USB) or keyboard connection, but not for reading media from external sources in MTP mode.
The second common reason is the file system format: If your phone is formatted in an exFAT or NTFS file system, and your TV only supports good old-fashioned FAT32, it won't be able to read the folder structure. However, in the case of phone-as-a-device (MTP) connectivity, this limitation is less common, because MTP broadcasts data differently than direct disk access.
⚠️ Attention: Not all USB-The ports on the TV are the same «HDD» or «5V 1A» It's designed for external hard drives and may not work properly with smartphones. Try switching the cable to another connector, marked simply as «USB» or "Media».
You should also consider the protocol version. USB. If you are using a very old cable USB 2.0 with a TV that supports only USB 3.0 (or vice versa), there may be speed matching conflicts, although more often it just leads to slow work.It is important to check whether your Xiaomi supports video transmission via a video link. USB (MHL SlimPort, or SlimPort, as conventional charging cables often don’t have the necessary contacts to transmit the video stream.
Setting up USB mode on Xiaomi smartphone
The most common reason why a TV doesn’t see a phone is because of hidden mode. USB-When you connect the cable, Android defaults to charging mode to save energy and security, and you need to manually switch that mode to File Transfer or «MTP».
To do this, do the following: connect the cable to your phone and TV, then unlock your smartphone screen. Swipe from top to bottom to open the notification panel. You should see the system notification "Charge via USB" or "Setting up USB." Click on it to open the mode selection menu.
In the list that opens, select File Transfer (MTP) or Photo Transfer (PTP) as the preferred MTP mode, as it allows the TV to see folder and file structure, not just images. Once the mode is selected, the TV must emit the characteristic device connection sound and, after a few seconds, display the external drive icon in the signal source list.
- 📱 Unlock the phone screen immediately after connecting the cable.
- 🔔 Lower the notification curtain and find the item Charging through USB».
- 🔄 Select the "File Transfer" mode in the menu or «MTP».
- 📺 Check the source list (Input) on the TV remote.
If the notification doesn't appear, it may be hidden. Try connecting the cable, then turning off and turning on the lock screen again. Sometimes the MIUI system "falls asleep" and ignores new connections until the user interacts with the interface.
☑️ Checking the settings USB
Problems with cables and physical connection
The quality of the cable plays a critical role in connection stability. Cheap cables bundled with various gadgets (headphones, power-bank) often have only two working veins to power and lack data lines. Visually they are no different from the original ones, but the phone only charges through them without transmitting a signal.
The length of the cable also matters. For USB 2.0, the maximum length of a quality cable should not exceed 2 meters. If you use a long wire (3-5 meters) without an active amplifier, the signal may fade and the TV will not be able to identify the device. In the case of Xiaomi using a Type-C connector, it is important that the cable supports data transmission standards, not just fast charging.
| Type of cable | Support for data | Probability of success | Recommendation |
|---|---|---|---|
| The original Xiaomi | Complete. | 95% | Use first and foremost |
| Cheap analogue (market) | Just charging. | 10% | Replace it with quality |
| USB 3.0 (blue connector) | Full (high speed) | 85% | Good for 4K video |
| Damaged cable | No. | 0% | Dispose of |
Note the condition of the connectors. Dust and pile can accumulate in the Type-C port of the phone, which prevents all pins from coming into close contact. Carefully clean the port with a wooden toothpick or plastic spatula, without using metal objects to avoid closing contacts.
⚠️ Attention: Using damaged or bloated cables can cause voltage surges that can disable the power controller of a TV or smartphone. Visually inspect the braid for clamps.
Developer settings and debugging over USB
In some cases, standard settings don't help, and you need to activate hidden functions through the Developer Menu, which is especially true if the TV is old or uses specific drivers. USB It can force the phone to force a connection.
To get to the developer menu, go to Settings → About Phone and quickly click 7-10 times on MIUI Version (or OS Version) until the message “You’re a developer” appears. Then go back to the main settings menu, find the “Additional” → “Developers” section.
Inside the menu, find the USB Debugging option and activate it. You should also look at the default USB configuration option. Set the file transfer value there. This will make the phone always offer this mode when you connect to a new device, bypassing the charging mode only.
- 🛠 Activate the developer mode taps by build number.
- 🔌 Turn on the "Debugging by" switch USB».
- ⚙️ Find the "Configuration" USB default».
- 💾 Select "File Transfer (MTP)».
Be careful with other settings on this menu. Changing the settings associated with zooming or animation will not affect the connection, but accidentally turning on "Always on debugging mode" can reduce the security of the device when connecting to public charging stations.
Why do you need USB debugging for a regular user?
Alternative ways of connecting and broadcasting
If wired connectivity never works, don’t despair. Xiaomi’s modern TVs and smartphones offer more advanced wireless broadcasting methods that are often more stable and convenient than cables. Miracast technology (called “Translation” or “Wireless Monitor” on Xiaomi devices) allows you to duplicate the screen without delay.
To use this feature, make sure that the TV and phone are connected to the same Wi-Fi network. On the TV remote, find the Screen Mirroring, Translation or similar button. On the phone, open the control center, click Translation, and select your TV from the list. The image will appear on the big screen instantly.
Another option is to use media center applications such as Xiaomi Mi Remote (if TV supports MiTV) or third-party solutions such as Plex and AllConnect, which allow you to stream specific video or photo files to your TV using a Wi-Fi router as an intermediary, which relieves the load on the phone's processor.
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If your Wi-Fi router supports 5GHz, switch both devices to that network, which will significantly reduce latency and improve picture quality when streaming high-resolution video wirelessly.
Diagnostics of problems with file formats
Even if the phone is defined as a drive, the TV may not see specific files, due to the limitations of the built-in media player TV. Many TVs do not support modern video codecs, such as HEVC (H.265) or audio formats like DTS, which are easily played on a smartphone.
In this case, the TV will see the file, but when you try to launch it will give an error "Unsupported format" or simply ignore it.The solution is to use third-party applications on the TV itself (if it is a Smart TV on Android), for example, VLC for Android or MX Player, which have their own codecs.
It's also worth checking the folder structure. Some TVs get lost if there are too many files or folders at the root of the disk. Try moving media files to a separate folder with a simple name, like /Video, and avoid using Cyrillic in filenames if the TV is old.
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Codec compatibility is more important than the way you connect, and if the TV doesn't read the file format, even the perfect one. USB-Connection won’t help – use a conversion or third-party player on TV.