Connecting a smartphone to a TV via a USB cable is one of the most versatile ways to broadcast content to a big screen. Unlike wireless technologies like Miracast or Google Cast, a USB connection does not require stable Wi-Fi, does not suffer from delays and works even on older TV models. However, not everyone knows that for a successful connection it is not enough just to plug in the cable - you need to correctly configure the data transfer modes and take into account the limitations of specific devices.

In this article we will analyze all possible connection scenarios: from simple display of photos to full screen duplication (if supported by your TV). You will learn what cables and adapters are needed for different models Samsung, LG, Sony Bravia and other brands, how to enable USB debugging for advanced functions, and what to do if the TV does not see the phone. We will pay special attention to typical errors due to which the connection is interrupted or does not work correctly.

Important: connection capabilities depend on the version Android on the smartphone and the firmware of the TV. For example, phones with Android 10+ may require additional permissions to transfer media files, and TVs older than 2018 often do not support MHL (Mobile High-Definition Link) mode the standard that allows you to display images from the smartphone screen directly via USB. If your TV does not recognize your phone as a signal source, you will most likely need a special adapter.

1. What cables and adapters are needed for connection

Not every USB cable is suitable for connecting a smartphone and TV. Here's what you need to consider when choosing:

  • 🔌 A standard USB-C/USB-A cable - suitable for transferring files (photos, videos, music), but not for screen duplication. Such a cable usually comes with a smartphone.
  • 📺 MHL adapter is needed to display images on the TV screen (works only with TVs that support MHL). Adapters come in USB-C or Micro-USB.
  • ⚡ USB-OTG cable - allows you to connect peripheral devices (for example, flash drives) to a smartphone, but it is not enough to connect to TV without additional adapters.
  • 🔄 Active HDMI adapter is a universal solution for modern smartphones (for example, Samsung DeX or Google Pixel), but requires support DisplayPort Alt Mode.

Before purchasing the adapter, check whether your TV supports it MHL or HDMI-CEC. This information is usually indicated in the technical specifications of the model or on the manufacturer's official website. For example, TV Samsung series QLED 2020+ often work with Samsung DeX via USB-C, and models LG before 2019 may require a separate MHL hub.

📊 What brand is your TV?
Samsung
LG
Sony
Xiaomi
Philips
Other

If you plan to broadcast video in high definition (for example, 4K), pay attention to the version of the HDMIport on the TV. For 4K@60Hz need HDMI 2.0 or newer. Old TVs with HDMI 1.4 will be able to output the maximum Full HD (1080p).

⚠️ Attention: Some smartphones (for example, Xiaomi Redmi Note or Realme) block video transmission via USB due to DRM policy. In this case, you will have to use wireless technologies or special applications like ApowerMirror.

2. Step-by-step guide: connecting to transfer files

If you just need to copy photos, music or videos from your phone to your TV (or vice versa), a standard USB cable is enough. Here's how to do it:

  1. Connect your smartphone to the TV using a cable USB-C → USB-A (or Micro-USB → USB-A for older models).
  2. On the TV select the signal source - usually this is the section Media, USB or External devices (on the remote control press Source or Input).
  3. On smartphone will appear notification "USB charging". Tap on it and select mode "File transfer" (or "MTP").
  4. Use the TV remote controlto open the file phone system and select the desired media files.

Unlock the smartphone screen

Use the original cable

Check the USB port on the TV (should be working)

Disconnect other USB devices from the TV-->

On some TVs (for example, Sony Bravia), you may need to install a special application to view files. Usually it is called Media Player or Photo & Video. try:

  • 🔄 Reconnect the cable (sometimes changing the USB port on the TV helps).
  • 📱 Restart the smartphone.
  • 🔧 Update the TV firmware (in the menu Settings → Support → Software update).

If you connect Android 11+, the system may request additional permission to access files. Allow it, otherwise the TV will not be able to read the contents of the phone.

3. How to display the smartphone screen on TV via USB (MHL/DeX)

To completely duplicate the phone screen to a TV (as with Wi-Fi mirroring), you need a special protocol - MHL or DisplayPort Alt Mode. Not all devices support this function, so first check the compatibility:

Smartphone manufacturer Support MHL Alternative method
Samsung (until 2020) Yes (requires an MHL adapter) Samsung DeX (USB-C → HDMI)
LG, Sony, HTC Yes (on most models) Special adapters SlimPort
Xiaomi, Redmi, POCO No (DRM blocking) Wireless mirroring or Miracast
Google Pixel, OnePlus No (DisplayPort only) Adapter USB-C → HDMI with support Alt Mode

If your smartphone supports MHL, follow these steps:

  1. Buy MHL adapter (for example, Samsung EH-MU90 or universal Belkin).
  2. Connect the adapter to your smartphone, and then connect it to the TV via HDMIcable.
  3. On the TV, select the signal source HDMI (ports may be named HDMI 1/MHL).
  4. The smartphone screen should automatically appear on the TV. If no - check the settings Display → Wireless display (on some firmware you need to manually enable MHL).
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If the image on TV is blurry or has artifacts, try reducing the smartphone screen resolution to 1080p in the display settings. This will reduce the load on adapter.

For owners Samsung Galaxy S8 and newer a mode is available Samsung DeX, which converts the TV into a full-fledged desktop. To do this:

  1. Connect your smartphone to the TV. via original USB-C → HDMI cable (or adapter DeX Station).
  2. A notification will appear on the phone screen - select "Launch DeX".
  3. Control the interface using the mouse/keyboard (connected via Bluetooth) or a TV touch control panel.
⚠️ Attention: Mode DeX may not work on non-original cables. Use only certified accessories from Samsung.

4. Setting up USB debugging for advanced ones. functions

If standard connection methods do not work, you can try to enable USB debugging. This will allow you to use specialized applications for screen mirroring (for example, scrcpy or VysorHowever, this method requires some technical knowledge.

To enable USB debugging:

  1. Go to Settings → About phone.
  2. Find item "Build number" and tap on it 7 timesuntil the message appears "You have become a developer!".
  3. Return to the main page settings menu and open System → For developers.
  4. Activate the switches "USB debugging" and "Allow debugging (with connection)".

After that, connect your smartphone to the TV via USB and confirm the debugging permission on the phone screen. Now you can use scrcpy (a free utility for PC) to cast the screen to your TV via a computer or special applications for Android TV.

How to install scrcpy for mirroring

1. Download scrcpy to PC (Windows/Linux/Mac).

2. Connect your smartphone to your computer via USB and enable debugging.

3. Run scrcpy.exe —the phone screen will be displayed on the PC.

4. Connect your PC to your TV via HDMI or use Steam Link to cast to your TV.

Please note: USB debugging may pose a security risk if you connect your phone to unfamiliar devices. Disable this mode after use.

5. Typical problems and their solutions

Even with correct connection, errors may occur. Here are the most common and ways to eliminate them:

  • 🚫 The TV does not see the phone:
    • Check whether the mode is turned on MTP on the smartphone.
    • Try another USB port on the TV (some ports are intended only for service functions).
    • Update the TV firmware.
  • 🔊 No sound when connected via MHL:
    • Make sure the correct audio source is selected in the TV settings (HDMI ARC or External speakers).
    • Check if the sound on your smartphone is muted.
  • 📶 The image is laggy or slow.:
    • Reduce the smartphone screen resolution to 720p.
    • Disable background applications that consume resources.
    • Use a high-quality cable that supports high data transfer rates.
  • ⚡ The phone does not charge when connected:
    • Use a USB hub with external power.
    • Check whether the energy-saving mode is blocking USB charging.

If you use an adapter MHL and the image periodically disappears, the reason may be insufficient power. Some adapters require connection to an outlet via Micro-USB for stable operation.

⚠️ Attention: On TVs LG s webOS sometimes protection against uncertified devices is triggered. In this case, a message will appear "Unsupported device". The solution is to disable the check in the service menu (available only for specialists).

6. Alternative connection methods (if USB does not work)

If connecting via USB is not possible (for example, due to incompatibility or broken port), consider alternative options:

  • 📶 Wireless mirroring:
    • Miracast (built into Android 4.2+).
    • Google Cast (requires Chromecast or TV with Android TV).
    • Applications like ApowerMirror or TeamViewer QuickSupport.
  • 🔌 Connecting via HDMI:
    • Use an adapter USB-C → HDMI (for example, Samsung DeX or Huawei Desktop Mode).
    • For old smartphones - Micro-USB → HDMI (adapter SlimPort).
  • 💻 Broadcast via PC:
    • Connect the phone to the computer, and the PC to the TV via HDMI.
    • Use scrcpy or Vysor to duplicate the screen.

If your TV supports DLNA, you can stream media files without connecting via USB. To do this:

  1. Install the application on your smartphone BubbleUPnP or LocalCast.
  2. Enable DLNA in the TV settings (usually in the section Network).
  3. Select a file on your phone and send it to TV via the app.
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Wireless connection methods are often easier to set up, but may suffer from delays (lags) when watching videos or playing games. A USB connection remains the most stable option for lag-free streaming.

USB connection capabilities depend on the model. TV. Below is a brief overview of supported functions for popular brands:

TV brand and series MHL support File transfer (MTP) Screen mirroring
Samsung QLED (2018–2023) No (only DeX) Yes Yes (via DeX or Smart View)
LG OLED/CX (2020+) No Yes Yes (via Screen Share)
Sony Bravia (2019–2023) Yes (on some models) Yes Yes (via Photo Share Plus)
Xiaomi Mi TV (all models) No Yes Yes (via Wi-Fi only)
Philips (Android TV) No Yes Yes (via Google Cast)

For TVs Samsung and LG The latest generations of USB ports are often used only for service functions or connecting a keyboard/mouse. In this case, you will have to use wireless technologies to mirror the screen.

If your TV does not support MTP, but has a port USB 3.0, try connecting an external drive (flash drive) and copying the files. from the phone to it via an OTG adapter.

8. Security and optimization of connection

When you frequently connect your smartphone to the TV via USB, it is worth considering several nuances:

  • 🔒 Data protection:
    • Do not connect the phone to public TV (in hotels, airports) - this can lead to leakage of personal information.
    • Use Guest mode on a smartphone if you need to show content to strangers.
  • ⚡ Power consumption:
    • Long-term connection via USB drains the phone's battery. Use an external power source.
    • Turn off Wi-Fi on the phone if they are not needed - this will reduce heating. Bluetooth on the phone, if they are not needed, this will reduce the heating.
  • 🎮 For gamers:
    • For games with gamepads connect the controller directly to the TV (if supported).
    • Use a cable with a ferrite ring to reduce interference.

If you often connect your phone to the TV to watch movies, it is recommended to:

  • Download content in a resolution that matches the capabilities of the TV (for example, 1080p for Full HDTVs).
  • Use applications that support hardware decoding (for example, VLC or MX Player).
  • Disable automatic application updates on your phone during broadcasting.
⚠️ Attention: When connected via MHL or DeX the phone may become very hot. Do not cover the ventilation openings and do not leave the device in direct sunlight.

FAQ: Frequently asked questions connection

Can I connect an iPhone to TV via USB like Android?

No, iPhone does not support file transfer or screen mirroring via a USB cable. For this you need an Lightning → HDMI adapter (official from Apple) or wireless technologies (AirPlay).

Why does the TV write "Device not supported" when connected via USB?

This error occurs if:

  • TV does not support MTP or MHL.
  • A non-original cable is used.
  • The smartphone mode is turned on "Charging only".

Solution: try a different cable, update the TV firmware or use a wireless connection.

How to connect your smartphone to old TV without HDMI?

If the TV only has AV (tulips) or SCART, you will need:

  1. Adapter HDMI → AV (for example, Portta PET1016).
  2. MHL-adapter for a smartphone (if supported).
  3. Connect the smartphone → MHL → HDMI adapter → TV.

The image quality will be lower than through HDMI, but this is the only way for older models.

Is it possible to charge the phone from the TV via USB?

Yes, but the charging speed will be low (usually 0.5Aas the TV's USB port is not designed for high current. For fast charging, use the original one. Memory.

Why is the video from the phone not played on TV via USB?

Possible reasons:

  • The TV does not support the video format (for example, .mkv or HEVC).
  • The file is protected by DRM (for example, downloaded from Netflix or Disney+).
  • The USB port does not have enough power for decoding.

Solution: convert video to .mp4 (H.264) or use Plex for transcoding.