When a Xiaomi TV makes interface sounds, plays a movie audio track, or broadcasts TV channels, but the screen is completely black, it is a common problem. It does not always mean a fatal breakdown of the matrix, as it may seem at first glance. Often the failure is in the software or the wrong signal resolution.
Users are faced with the fact that after connecting the game console or updating the firmware, the device stops displaying the picture. It is important not to panic and consistently check all possible points of failure. In most cases, the restoration of the Smart TV is possible at home without calling the wizard.
We're going to look at an algorithm that can help you localize the malfunction. HDMI-cable, failure in the Android operating system TV or physical damage to the backlight, our instructions will help you make the right decision.
Diagnosis of illumination and matrix
The first thing you need to exclude physical damage to the screen or failure. LED-If there's sound, it means the main board is working, and it's processing the video signal, but it's not transmitting it to the matrix.
Take a flashlight (brighter, for example, from a smartphone) and illuminate the screen at point-blank ranges. Take a close look: if you see a dim, barely distinguishable image of an interface or logo, then the problem lies in the problem of the interface. LED-It could have burned out in whole or in part.
⚠️ Warning: Don't try to disassemble the matrix yourself unless you have experience.The screen is extremely fragile, and any careless movement can lead to cracks, after which recovery will be impossible.
If the flashlight is completely black, without a single spot, it may indicate a malfunction of the matrix control board (T-Con) or the matrix itself, and in some cases it also indicates a deep software failure.
Verification HDMI-cable and external sources
Often the reason for the lack of image is a banal conflict of permissions between the source of the signal (set-top box, console, PC) and the Xiaomi Mi TV. If the source produces a signal that the TV can not process, you will hear the sound, but you will not see the pictures.
Try turning off all external devices and enabling an embedded app like YouTube or Netflix. If you see an image in the embedded apps, it means that the problem is precisely the cable or settings of the external device. HDMI-cable on a known serviceable, preferably version 2.0 or 2.1.
- 🔌 Check the density of the cable in the connector - it should sit tightly.
- 📺 Try switching to another one. HDMI-port, for example, from the first to the second.
- 🎮 Reset the permission settings on the connected console or console.
It’s also worth checking the refresh rate settings. If your signal source is 60Hz or 120Hz and your TV is set to automatic mode that can’t correctly detect it, a black screen will appear. In the source menu (if you can display it on another screen), try lowering the resolution to 1080p.
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Use it. HDMI-Long cables (more than 5 meters) of poor quality often fail to transmit video signals, only passing audio.
Resetting and restarting the system
Software slugs in PatchWall or Android TV can cause the driver to freeze, and in this case, the system works, the sound is played, but the video output is blocked, and the first step is to completely reboot.
Don't limit yourself to turning off the remote. Turn off the TV physically by pulling the plug out of the plug. Wait 2 to 3 minutes for the capacitors to run out completely, and turn it on again. This action often helps to reset the time errors of the video processor.
☑️ The soft reboot algorithm
If a simple reboot didn't work, try resetting to factory settings. Because you can't see the image, you can't do it through the menu. Use a combination of buttons on the remote or the case. Often, it helps to press the switch off button on the TV body (not the remote) at the time of switching on.
⚠️ Warning: Full Hard Reset will delete all your accounts, installed apps, and personalized settings. Use this method only if other methods have not helped.
Updating and flashing the TV
The unstable operation of the video chip can be caused by bugs in the current version of the firmware. If you have the opportunity to see the image for even a short time (for example, it appears for a split second when turned on), urgently check the updates. Go to Settings → About TV → System Update.
In cases where the screen is black all the time, it will help to update through the USB-You'll need a computer and a flash drive. Download the current firmware for your model. TV 4A, 4S, P1 The firmware file usually has the.apk extension or is an archive that needs to be unpacked into the root of the flash drive.
The path to the firmware file: /MiTV_Upgrade/packagePut the flash drive in. USB-TV port (it is better to use the port) USB 2.0, often blue. Once power is turned on, the system must detect the update file and prompt it to install. The screen can blink and the update process will begin.
What if the TV doesn’t see the slate?
Hardware malfunctions: board and plumes
If software and cable testing fail, there's a hardware breakdown, and there's a number of components inside the TV that generate the image, and most often, the T-Con (Timing Controller) board that transmits the signal from the motherboard to the matrix.
Another common cause is oxidation or plume waste, where the contacts can move away during transportation or because of temperature changes, and carefully reconnecting the plumes inside the housing (only when the device is off!) sometimes returns the picture.
| Symptoms. | Probable cause | Decision |
|---|---|---|
| There's a sound, the screen is black, the menu is not visible. | Failure of the backlight or T-Con | Replacement of LEDs or Controller |
| Image appears and goes out | Overheating of the video processor | Cleaning from dust, replacing heat paste |
| Black screen after update | Software failure (brick) | Flashing through UART/USB |
| Stripes on the black screen | Damage to the matrix or plume | Replacement of matrix or plume |
Special attention should be paid to the power supply. If the voltages at the output of the power supply are unstable, the backlight may not start, although the sound will already work, Diagnosis requires multimeter and high voltage skills.
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Diagnostics of the hardware require the body to be opened, and if the TV is guaranteed, any breach of the seals will result in the denial of free repairs.
When a service center is needed
There are situations where self-repairing is not only useless, but also dangerous, and if you find swollen capacitors, the smell of burning or visible signs of corrosion on the board, you better stop further experiments.
Replacing the screen in modern Xiaomi TVs is often economically impractical, as the cost of a new matrix is up to 80% of the price of a new TV, and the wizard will be able to accurately diagnose whether it is worth repairing the device.
- 🛠️ Requires rationing of components on board.
- 💡 Replacement is needed LED-tape (needs careful removal of the matrix).
- 📟 The motherboard is faulty (Main Board).
Service centers use special equipment to run EEPROM memory and stress testing, which is not available at home. If the TV is new, don't risk the warranty.