Matrix lighting on Xiaomi TV: 7 ways to fix the defect without a service center

Matrix illumination is one of the most common problems with Xiaomi Mi series TVs TV 4S, Mi TV 5, Redmi Smart TV and other models LED-The defect is manifested as light spots, stripes, or a general fog on a dark background, which is especially noticeable when watching movies with black scenes. 80% of the time, the fault is caused by a malfunction of the lighting, not the matrix itself, which is good news, because repairs are cheaper.

In this article, we'll look at all the possible causes of illumination, from factory defects to wear and tear of components, and give you step-by-step instructions for diagnosing and fixing the problem. We'll focus on methods that can be used at home without special equipment. If you notice that the black color on the screen has turned gray and the contrast has dropped, don't rush the TV to the service: in half of cases, a simple setup or inexpensive replacement of parts solves the problem.

Reasons for the lighting matrix on Xiaomi TVs

Illumination rarely occurs suddenly, usually a gradual process involving wear and tear of components or external factors.

• 🔦 Malfunction LED-backlighting: burnout or degradation of LEDs in the matrix (especially relevant for older models) 3-4 years).
• 📏 Diffuser problems: detachment or damage to the light-diffusing film inside the screen.
• 🔌 Power supply failures: voltage surges lead to uneven illumination.
• 🛠️ Factory marriage: uneven distribution of LEDs (found in Xiaomi Mi) TV 4A first-party).
• 🔥 Overheating: prolonged work in a closed space accelerates the wear of the backlight.

The easiest way to determine the cause is to look at the screen from an angle. If the light is visible only when you look directly, the problem is more likely to be the backlight. If the defect is visible from any angle, the matrix or the lens is to blame.

• 🟡 Yellow spots are a sign of ageing LED-ribbon.
• 🟣 Purple shade - a problem with the backlight driver.
• ⚪ White stripes - detachment of the lens or damage to the matrix.

⚠️ Warning: If the lighting appears after a TV drop or hit, do not attempt to repair it yourself, in which case there is a high probability of damage to the liquid crystal layer, and any intervention can aggravate the problem.

Diagnosis of illumination: how to determine the exact cause

Before you start repairing, you need to accurately determine the source of the problem.

1. Dark room (turn off all lights).
2. Test images with a uniform black background (you can use video to check the illumination).
3. A flashlight or lamp to illuminate the screen from the back.

Step-by-step diagnostics:

1. Turn on the TV Mode (or Dark Mode in the picture settings) and run a black screen test video. Evaluate the uniformity of the backlight. If the lights are only visible in the corners, the problem is: LED-ribbon.
2. Light the flashlight from the back on the screen at an angle of 45°. If there are rainbow spots, the polarization layer of the matrix is damaged.
3. Check the TV for artifacts when you turn on. 10-15 Minutes of work - to blame overheating.

For more accurate diagnosis, you can use the Xiaomi service menu.

1. Turn off the TV with the remote.


2. Press the remote sequentially: Menu → 1 → 3 → 9 → Menu.




3. Go to the "LED Test" or "Backlight" section.

In the service menu, pay attention to the parameters LED Current and Backlight Voltage: If the values are very different from the norm (for example, the current is above 600 mA for Mi). TV 5 Pro), problem in power supply or backlight driver.

Software methods for eliminating illumination

In 30 percent of cases, the lighting is not due to hardware malfunctions, but to the incorrect settings of the TV.

1. Resetting image settings

Factory image settings can fix the problem if it's caused by a software failure.

1. Go to Settings → Picture → Image modes.
2. Choose Standard or Movie.
3. Click Reset (usually at the bottom of the screen).

After reset, turn off all additional image processing functions:

• 🔘 Dynamic Backlight (Dynamic Backlight)
• 🔘 Local Dimming (Local Dimming)
• 🔘 Improved Contrast Enhancement (Contrast Enhancement)

2. Firmware update

In some Xiaomi models (e.g. Mi) TV Q1E) The lights are due to firmware bugs:

Settings → About TV → System Update → Check for Updates

If automatic updates do not help, you can install the firmware manually:

1. Download the latest version of the software for your model from the official Xiaomi website.
2. Unpack the archive and copy the update.zip file to the flash drive (FAT32 format).
3. Insert the flash drive into the TV and select Update through USB.

⚠️ Warning: If the TV turns off or freezes during the upgrade, do not try to turn it on again for 10 minutes.

Download firmware specifically for your model (check the number on the sticker at the back)

Format the flash drive into FAT32 (not NTFS!)

Make sure the file is called update.zip (symbolless)

Do not turn off the TV during the process (even if it is “hang” at 5).+ minute)

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Hardware methods of lighting repair

If the software didn't work, you'd have to go into hardware. Let's look at three basic methods, starting with the simplest one.

1. Replacement LED-lighting

The most common reason for illumination is a burnt-out LED in the backlight, which is cheaper than buying a new matrix.

• 🔧 A set of screwdrivers (including for T5 and T8).
• 🔥 A soldering iron with a thin sting (power) 30-40 Watt).
• 💡 New LED-The tape (select from the TV model).
• 🧲 Antistatic bracelet (required!).

Step-by-step:

1. Turn off the TV and remove the back cover (usually it is attached to the latches and 4-6 screw).
2. Carefully disconnect the matrix plumes and the power supply. Don't pull the wires! - press the locks first.
3. Take the metal frame that holds the matrix off, and underneath it you'll see. LED-perimeter.
4. Check each tape for blackened or bloated diodes. Replace the faulty elements.

Cost of new LED-tapes for Xiaomi Mi TV 4S 55" — near 1500-2000 If you are not sure about your rationing skills, it is better to contact the service.

Repair of the power supply

If the lighting is accompanied by a flicker of the screen or spontaneous reboots, the problem may be in the power supply.

• 🔋 Capacitors (blown or leaking).
• 🔄 Transistors in the lighting circuit.
• 🔌 Power connectors LED-tape.

For diagnosis:

1. Remove the power supply cover (usually located at the bottom of the TV).
2. Inspect the capacitors – if they are bloated, they need to be replaced.
3. Call the transistor multimeter (resistance must be within range) 0.5-1 kom).

Typical malfunctions of Xiaomi power supplies TV:

⚠️ Warning: When working with a power supply, do not touch the board with your bare hands - even when turned off, capacitors can store a charge of up to 300 V. Use isolated tools.

Replacement of the lens or matrix

If the lighting appears as blurred spots or iridescents, the problem may be the diffusing film or the matrix itself.

• 🔍 Check the integrity of the diffuser - if it has detached, it can be glued back with double-sided tape.
• 🔄 If the matrix is damaged (cracks, dark spots), it will have to be replaced. TV 5 - from 15,000 rubles.

Replacing the matrix is a complex process that requires special equipment (for example, an infrared heater to peel off an old panel). If you are not confident in your abilities, you should trust the professionals to do the work.

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Before you replace the matrix, check it for compatibility by model number (indicated on the sticker at the back of the TV). TV 4S 55's not good for Mi TV 4X 55" even if the diagonals match.

Prevention of illumination: how to prolong the life of the matrix

To avoid re-emergence of light, follow these recommendations:

• 🌡️ Control the temperature: do not place the TV in closed niches or near batteries — 10-35°C.
• ⚡ Use a network filter: voltage surges reduce the life of the system LED-lighting.
• 📺 Adjust brightness: Do not set maximum lighting (optimum — 60-70% high-pitch).
• 🔄 Turn on the power saving mode in the settings (reduces the load on the backlight).

It is also recommended to check the TV every 3 months for lighting with test videos, and early detection of the problem will eliminate it at minimal cost.

For Xiaomi models with Automatic Brightness (Mi) TV Q2, Redmi Max) disable it – the light sensor often overstates the level of backlight, which accelerates wear and tear LED.

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Regular cleaning of the TV from dust (especially vents) reduces the risk of overheating and prolongs the service life of backlights on the air. 20-30%.

When to contact the service center

Not all illumination problems can be solved by yourself.

• 🔧 The light appeared after a fall or hit the TV.
• 💥 The screen flickers or spontaneously turns off.
• 🔍 The diagnosis showed a malfunction of the matrix or T-CON pay-off.
• ⚡ The TV will not turn on after an attempt at repair.

The cost of repairs in the service center Xiaomi (in Russia, 2026):

Before visiting the service, take a photo of the light at different corners of the screen - this will help the wizard to determine the cause faster. Also check whether the warranty is valid: Xiaomi has a 1-year on TVs (2 years per matrix in some models).

Frequent questions about the lighting of the Xiaomi matrix TV