When a Xiaomi Mi TV or Redmi TV suddenly flashes, flickers or is covered in colored stripes, it can be taken by surprise. Often users are faced with the image disappearing, appearing, or the screen begins to pulsate randomly. This does not always indicate a fatal breakdown of the matrix, but the problem cannot be ignored.
The reasons for this behavior can range from a banal bad contact in the cable to a deep failure in the system software. In some cases, the culprit is unstable voltage in the power grid or a conflict of connected external devices.
In this article, we will discuss the main fault scenarios in detail, you will learn how to distinguish a software glitch from a hardware failure and what steps you need to take to restore normal operation of your TV.
Software failures and operating system problems
The most common cause of unstable images is errors in the Android TV operating system, on which modern Xiaomi models are based. During operation, temporary files accumulate in memory that can conflict with system processes.
Also, flickering can occur after a failed automatic update: If a new firmware version has a power surge or Internet interruption, the system files may have been damaged, in which case the TV tries to function, but the video driver is not working properly.
⚠️ Note: If the blinking started immediately after the system update, do not expect the problem to disappear by itself.
To eliminate software errors, it is often enough to completely reboot the device, not just put it into sleep with the remote button, but completely shut down. Pull the cord out of the socket for 2-3 minutes to discharge the capacitors and clear the RAM. Once turned on, the system will start from a clean sheet.
💡
Use the Quick Turn on feature with caution. Periodically turn off the TV completely from the socket to reset system errors.
If a simple reboot didn’t work, check for updates manually. Sometimes Xiaomi releases patches that fix bugs from previous versions. Go to Settings → Device → System Update. If the problem occurs after the update, only a rollback or a full reset will help.
☑️ Diagnostics of the program part
Problems with connecting external devices and cables
The second most common cause of flickering is external factors related to video transmission. If you use a console, game console or laptop connected via HDMI, the problem can be in the cable. Cheap or damaged wires often do not cope with high-resolution signal transmission, especially in 4K HDR formats or at high refresh rates of 60 Hz and above.
Poor contact in the connector also causes the screen to turn off and light up, oxidizing the contacts or mechanical damage to the port on the TV itself disrupts the circuit integrity, in which case the image may ripple or the screen will periodically blacken.
Check the density of the cable. Try to switch the wire to another HDMI port. If you can, replace the cable with a known, preferably certified High Speed. It's also worth checking with another signal source, such as running a built-in YouTube app, and if it's stable, then the problem is exactly in the external device or wire.
Adapters, for example, with HDMI to VGA or DVI, are particularly noteworthy. Active converters require power and may work unstablely, causing image pulsation, and passive adapters can also cause distortion if the signal length is not enough.
Matrix malfunctions and screen illumination
If software methods and cable replacements fail, there is a high probability of hardware failure. LED-In Xiaomi TVs, LED backlights are responsible for the glow of the screen. Failure of even one LED can cause the entire screen or part of it to flicker.
The symptoms of a backlight problem often look like rhythmic blinking or brightness pulsing. Sometimes the screen can light up for a split second and immediately go out, although the sound remains, indicating that the backlight driver is trying to start the lamps, but receives an error signal and turns off the power.
| Symptoms. | Probable cause | Difficulty of repair |
|---|---|---|
| Screen blinks, sound is there | Malfunction LED-driver | Medium |
| Vertical stripes | Damage to the matrix plume (Tab) | Tall. |
| Dark spots when turned on | Burn-out of individual diodes | Medium |
| The only shimmering in the corners | Uneven pressure on the matrix | Low. |
Another major problem is the damage to the plumes that go to the matrix, and if the TV was hit or was subjected to a lot of pressure during transportation, the contacts could move away, visually it can manifest as colored stripes or ripples that change intensity when you press the frame.
⚠️ Warning: Do not attempt to disassemble the matrix yourself without experience. This is a fragile element, and any careless movement can lead to the appearance of black spots ("ink"), after which the TV cannot be restored.
You can use a flashlight to diagnose backlights, put it right on the black screen when the TV is on, and if you see a dim image of a menu or logo, it means that the matrix is working, and the problem is the backlight system.
The effect of power supply and voltage surges
The stability of any electronics, including Xiaomi smart TVs, depends on the quality of the power supply. Power surges in the network can cause chaotic behavior of the TV power supply. If the voltage is not enough, the power supply goes into protection, and the screen goes out, after which the cycle repeats.
Often, users connect the TV to a single network filter with powerful consumers, such as a refrigerator, microwave or laser printer. When these devices are turned on, the voltage in the network can drop briefly, which causes the TV to react.
Check if the plug is firmly inserted into the socket. Oxidated contacts in old sockets create additional resistance, which leads to heating and a voltage drop. Try turning the TV on to another socket, preferably in another room, to eliminate wiring problems.
💡
Using a quality network filter or voltage stabilizer can extend the life of a TV and eliminate flickering caused by surges in the network.
If your home is often flashing lights or experiencing voltage fluctuations, using a stabilizer becomes not just a recommendation, but a necessity. The power supply of the Xiaomi TV is sensitive to the quality of the input current.
Image settings conflicts and refresh rates
Sometimes the reason is trivial and lies in the incorrect settings of the TV itself: dynamic image enhancement features such as Motion Flow, AI Picture or dynamic contrast can work incorrectly on certain content, which causes the effect of "twitching" images or flickering in dark scenes.
Try resetting your image to factory values. Go to Settings → Image → Image Mode and select Standard or Movie. Turn off all the Improvers and Dynamic Backlight Modes. If the blinking stopped, it was the software processing of the image.
Also, pay attention to the refresh rate. If you've connected a PC, make sure the hertz frequency matches the capabilities of the matrix. Installing 120 Hz on a matrix with native 60 Hz can cause ripples and signal instability.
Hidden Developer Settings
When professional repairs are needed
There are a number of symptoms in which self-repairing is not only useless, but also dangerous. If you see sparkling inside the case, hear a crackle or smell a burn, immediately disconnect the device from the network.
The wizard's help is also needed if blinking is accompanied by vertical or horizontal bands that do not disappear after a reboot, indicating physical damage to the matrix or image controller, and replacing the matrix is often economically inappropriate, as it costs 70-80% of the price of a new TV.
If the TV is guaranteed, any attempt to self-open will result in a loss of warranty obligations, in which case the only correct solution is to contact an authorized service center Xiaomi.
Power supply repairs or LED belt replacements are standard procedures for service centers, and the cost of such repairs is usually adequate and allows the device to extend its life by several years.