Connecting a smartphone to a TV DEXP via a USB cable is one of the most versatile ways to broadcast the screen, view photos, videos, or even play on a big screen without lags. Unlike wireless technologies like Miracast or Google Cast, the USB connection does not depend on Wi-Fi speed, does not require additional adapters and works even on older TV models. However, not all users know that for a successful connection it is not enough to simply insert the cable - you need to correctly configure the data transfer mode on the phone and select the signal source on the TV.

In this article we will analyze all possible scenarios: from a basic connection for viewing media files to using the TV as a monitor for screen duplication (USB Display Mode). We will pay special attention to the nuances of working with TVs DEXP (series H32G7000, U50F6000, L43D7000 and others), as well as common problems such as lack of sound or black screen. If your phone is not detected by the TV, at the end of the article you will find a checklist for diagnosing faults.

Before you begin, check two key points: your USB cable must support data transfer (not all charging cables do!), and your TV DEXP has a port USB Type-A (usually located on the side or back). Are you ready? Then let's get started!

📊 What type of connection do you use most often?
By USB
By HDMI (via adapter)
By Wi-Fi (Miracast/Chromecast)
Not connected

1. Which DEXP phones and TVs support USB connections

Not every smartphone and not every model DEXP is capable of transmitting images via USB. Here are the key requirements:

  • 📱 Smartphone: must support the protocol MHL (Mobile High-Definition Link) or USB-C DisplayPort Alt Mode. These are the majority of flagships Samsung (series Galaxy S/A/Note since 2016), Google Pixel, OnePlus, Xiaomi (models from Snapdragon 8xx), as well as some devices Huawei and Sony. Budget phones (for example Redmi 9A or Samsung Galaxy M12) usually do not support image output via USB.
  • 📺 DEXP TV: must have a port USB 2.0/3.0 with support USB Host (possibility reading external devices). These are most models DEXP 2018 and newer, for example:
    • DEXP H32G7000, H43G7000 (series G7000)
    • DEXP U50F6000, U55F6000 (series F6000)
    • DEXP L43D7000, L50D7000 (series D7000)

    Older models (before 2017) may not recognize smartphones as a signal source.

  • 🔌 Cable: you need USB-TypeC or USB-MicroUSB (depending on the phone connector) with support for data transfer. The cables included in the charger kit are often not suitable - they are designed only for power.

Important: DEXP TVs do not support DeX (like Samsung) or Desktop Mode (like Huawei) mode via a standard USB port. These functions will require an adapter USB-C → HDMI.

⚠️ Attention: If your TV DEXP was released before 2018, check the availability of the function USB Media Player in the menu. Some models (for example DEXP H24E6000) can only play files from a flash drive, but not duplicate the smartphone screen.
TV model DEXP USB Host support Max. USB resolution MHL support
DEXP H32G7000 Yes 1920×1080 Partially (adapter required)
DEXP U50F6000 Yes 1366×768 No
DEXP L43D7000 Yes 1920×1080 Yes (with MHL cable)
DEXP H24E6000 Only for flash drives — No

2. Step-by-step guide: how to connect your phone to DEXP via USB

If your device meets the requirements from the previous section, follow these instructions. The process may differ slightly depending on the version Android and TV model, but the general scheme is the same.

Check compatibility of the phone and TV

Use an original USB cable with data support

Enable USB debugging (for Android 10+)

Update the firmware of the DEXP TV (if available)

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Step 1: Setting up the phone

  1. Connect the phone to the TV DEXP using a USB cable. A notification will appear on the smartphone screen "Charging via USB".

  2. Tap on the notification and select mode "File transfer" (or "MTP"). If there is no such item, go to Settings → System → For developers → USB configuration and install "File transfer".

  3. For Android 10 and newer you may need to enable USB debugging:

    1. Go to Settings → About phone → Build number and tap on it 7 times to activate developer mode.
    2. Go back to Settings → System → For Developers and enable "USB Debugging".

Step 2: Setting up the DEXP TV

  1. Turn on the TV and press the button on the remote control SOURCE (or INPUT).

  2. Select source USB (can be called "Media" or "USB Device").

  3. If the screen remains black, try switching the USB mode on your phone (see step 1). On some models DEXP (for example, U50F6000), you need to manually confirm the connection in the menu Settings → Devices → USB devices.

Step 3: Selecting a display mode

Depending on the purpose of the connection, select one of the modes:

  • 📂 Viewing files: the TV will display the contents of the phone's memory as a flash drive. Suitable for photos, videos and music.
  • 🖥️ Screen duplication: if the phone supports MHL or DisplayPort Alt Mode, the smartphone screen will be completely displayed on the TV. This may require an adapter.
  • 🎮 Game mode: some TVs DEXP (for example, H32G7000) reduce input lag when connected via USB, which is convenient for gameplay.

If the phone screen is not duplicated, but only files are displayed, then your smartphone does not support image output via USB. In this case, use alternative methods (see section 5).

💡

If the TV does not see the phone, try using OTG cable (USB-Host). Some models DEXP require additional power to recognize devices.

3. Why the phone does not connect to DEXP via USB: common errors

Even if you did everything according to the instructions, problems may arise. Here are the most common causes and ways to eliminate them:

  • ⚡ The cable does not support data transfer: 80% of problems are associated with low-quality cables. Use the original cable from the phone or a certified one USB 3.0.
  • 🔄 Wrong USB mode: if the mode is selected on the phone "Charging only", the TV will not see the device. Switch to "File transfer" or "MTP".
  • 📱 Outdated firmware: to Android 8 and below can There are no drivers for connecting to TV. Update the phone software.
  • 📺 TV settings: on some models DEXP (for example, L43D7000) you need to manually allow access to USB in the menu Security → Devices.
  • 🔌 Power shortage: if the phone is discharged below 20%, the TV may not recognize it. Connect the charger to the phone in parallel with a USB cable.
⚠️ Attention: If, when connected, the phone starts to heat up or discharges quickly, this is a sign of cable incompatibility or port. Disconnect devices and use wireless alternatives (for example, Miracast).
Problem Possible reason Solution
TV does not see the phone Cable for charging only Use a cable with support MTP
Black screen on TV Phone does not support MHL Use HDMI adapter
No sound Sound is output to the phone Enable "Sound output via HDMI/USB" in phone settings
Lags when watching videos Low speed USB 2.0 Use USB 3.0 or a wireless connection
What to do if the TV says “Device not supported”?

This error occurs when the TV DEXP cannot detect the type of connected device. Solutions:

1. Restart your phone and TV.

2. Connect the phone to another USB port on the TV (if there are several of them).

3. Update the TV firmware through the official website DEXP (section "Support").

4. Try using OTG hub with external power - sometimes this helps to “deceive” the recognition system.

4. Alternative connection methods if USB does not work

If your phone or TV DEXP does not support USB connection, consider these options:

  • 🔗 HDMI adapter: for smartphones with USB-C or MicroUSB you can buy an adapter USB-C → HDMI or MicroUSB → HDMI (MHL). Price: from 500 to 2000 rubles. Supports resolution up to 4K@30Hz.
  • 📶 Wireless broadcast (Miracast):
    1. On the TV DEXP enable Miracast (Settings → Network → Wi-Fi Direct).
    2. On the phone, activate "Wireless display" (Settings → Connected devices → Wireless display).
    3. Select your TV from the list of available devices.
    ⚠️ Attention: The delay with Miracast can reach 1-2 seconds - this is normal for watching videos, but inconvenient for games.
  • 🌐 Google Chromecast: if you have you have a set-top box Chromecast, connect it to the HDMI port of the TV and broadcast the screen through the app Google Home.
  • 🖥️ DLNA/UPnP: to view media files (photos, videos, music) without duplicating the screen, use applications like BubbleUPnP or LocalCast.

    • Comparison of connection methods:

    Method Latency Quality Setting complexity Additional. equipment
    USB (MTP) Minimum Up to 1080p Average Cable
    HDMI adapter No Before 4K Simple Adapter (from 500 ₽)
    Miracast 1-2 sec Before 1080p Complex No
    Chromecast 0.5-1 sec To 4K Simple Add-on (from 3000 ₽)
    💡

    Best suited for gaming and watching videos in high definition. HDMI adapter. USB and Miracast are more suitable for viewing photos and office tasks.

    5. How to output sound to a DEXP TV when connected via USB

    One ​​of the most common problems is that the sound continues to play on the phone, but not on the TV. This can be solved by setting up audio routing:

    For Android 9 and later:

    1. Connect the phone to the TV and activate the mode "File transfer".

    2. Open the notification panel and hold your finger on the icon "Media" (or "Sound").

    3. In the sound output menu, select "USB device" or "DEXP [TV model]".

    For Android 8 and older:

    1. Go to Settings → Sound → Sound output.

    2. Select "HDMI/USB" (even if the connection is via USB, some phones combine these options).

    If there is no item "USB device" :

    • 🔊 Install the application SoundAbout from Google Play —it allows you to manually redirect audio to an external device.
    • 🔄 Reboot your phone with the USB cable connected—sometimes this resets the audio routing settings.
    ⚠️ Attention: On some models DEXP (for example, H32G7000) sound via USB can only be transmitted in the format PCM 2.0. If the video plays without sound, try another player (for example, VLC instead of the standard one).

    6. Image optimization: how to remove lags and improve it. quality

    If the picture on your TV is slow or looks blurry, use these tips: DEXP slows down or looks blurry, try these tips:

    • ⚙️ Change the resolution: by default, the phone can transmit the image in low resolution. To fix this:
      1. Connect your phone to your TV.
      2. Go to Settings → Display → Screen resolution.
      3. Select 1920×1080 (if your TV supports Full HD).
  • 🎯 Disable animation: to reduce lag Settings → For developers set: 
    Window animation = Off

    Transition animation = Off
    

    Animation duration = Off

  • 🔄 Use game mode: on TVs DEXP series G7000 and newer there is an option "Game mode" (Settings → Picture → Picture mode). It reduces input lag to 10-15 ms.
  • 📶 Check the USB version: if you use port USB 2.0 on a TV, the maximum resolution will be 1366×768 at 30 Hz. For 1080p@60Hz you need USB 3.0 (blue connector).

    • To check the current screen resolution and refresh rate, install the application Screen Info from Google Play. It will show the actual output parameters to the TV.

    How to enable HDR when connected via USB?

    Unfortunately, TVs DEXP do not support transmission HDR via USB. For HDR content, use HDMI adapter enabled HDMI 2.0 or later. Also make sure that the mode is enabled on your phone "HDR always" in the screen settings (available on Samsung Galaxy S20+, Google Pixel 6 etc.).

    7. Security: how to avoid damage to ports and data

    An incorrect connection can lead to damage to the USB port on your phone or TV, as well as loss of data. Follow these rules:

    • ⚡ Do not connect/disconnect the cable during data transfer: this may damage the phone's file system. Always use the function "Safely Remove" (icon in the notification panel).
    • 🔋 Avoid overheating: If your phone or TV gets very hot, turn it off for 10-15 minutes. The USB port on the TV DEXP may turn off if overheated (fire protection).
    • 🛡️ Disable auto-updates: When connected to a TV, the phone may start updating applications in the background, which will slow down the broadcast. Enable "Airplane mode" or disable mobile data.
    • 🔒 Protect personal data: When the phone is connected to the TV in MTPmode, anyone can view your files. Use "Charging only"if you just need to duplicate the screen without access to memory.
      • ⚠️ Attention: If after connecting to DEXP phone stopped charging from other devices, check the USB port for dirt or damage. Use a flashlight and a magnifying glass - often the problem is bent contacts.

      FAQ: Frequently asked questions about connecting your phone to DEXP

      My phone Xiaomi Redmi Note 10 is not detected by the TV DEXP U50F6000. What should I do?

      Redmi Note 10 does not support image output via USB (no MHL or DisplayPort Alt Mode). You need an adapter USB-C → HDMI (cost ~1000 rubles). Also check if the mode "USB Debugging" is enabled in the developer settings.

      Only files are displayed on the TV, and the phone screen is not duplicated. Why?

      Your phone does not support image transfer via USB. This function is available only on flagship models (Samsung Galaxy S/A/Note, Google Pixel, OnePlus etc.). To duplicate the screen, use HDMI adapter or Miracast.

      When connected via USB, the video slows down. How to fix?

      Causes of lags:

      1. Cable USB 2.0 - replace with USB 3.0 (blue connector).
      2. The phone encodes video in real time - turn it on "Game mode" on TV and disable background applications.
      3. TV DEXP doesn't work 1080p@60Hz - lower the resolution to 720p.

    Is it possible to control the phone from the remote control of a DEXP TV?

    No, TVs DEXP do not support controlling the connected phone via the remote control. You can use:

    • Wireless mouse/keyboard (connected to the phone via Bluetooth).
    • Remote control applications (for example, TeamViewer QuickSupport).

    After connecting to the TV, the phone began to discharge quickly. Is this normal?

    Yes, when transferring an image via USB, the phone consumes 30-50% more energy. We recommend:

    • Connect the phone to charge in parallel with a USB cable to the TV.
    • Reduce the brightness of the phone screen to 50%.
    • Close background applications (especially instant messengers and social networks).