The backlight on the Xiaomi TV does not work: 7 ways to fix your own hands

Xiaomi's TV backlight is one of the most vulnerable parts of the device that could eventually fail: If the screen becomes dim, dark spots appear, or the image completely disappears, but the sound remains - the problem is most likely to lie in the backlight system. In this article, we will analyze all possible causes of malfunction, from a banal firmware failure to physical damage. LED-We will give you step-by-step instructions for home repairs.

It is important to understand that the backlight in Xiaomi TVs (be it Mi models) TV 4S, Mi TV Q1 or Redmi Smart TV) is based on LED matrixes that are powered by a separate unit - an inverter or LED-The breakdown can be related to the diodes themselves, as well as the power chains, and we're not going to go into theory, but we're going to go into practice right away: how to diagnose a problem, what to do first, and when to go to the service.

We warn you beforehand that some repair methods require disassembling the TV, which automatically deprives you of warranty (if it is still valid). If you are not sure of your abilities, you should trust the repair to the professionals. But if you are willing to take a risk, read on!

1. Diagnosis of the problem: how to understand that it is broken lighting

Before you take apart the TV, make sure the backlight is the problem.

• 🔦 The image is there, but it's very dim -- it's like looking through a dark glass -- and it's a partial failure. LED-tape.
• 📺 The screen is completely black, but the sound works, and if you hold the flashlight to the screen at an angle, you can see a faint image.
• 🔥 The TV turns on, but after a few seconds it goes out - the inverter may overheat or short circuit in the lighting circuit.
• 🌑 Dark spots or stripes on the screen that do not disappear when changing the channel – burned individual LEDs.

If none of these symptoms are right (e.g., no image or sound), the problem may be a power supply, motherboard, or plumes, in which case read our article on the full diagnostics of Xiaomi TV malfunctions.

For accurate diagnosis, perform a simple test:

1. Turn on the TV and wait for the download (must be sound).
2. Point a bright flashlight (for example, from a smartphone) at a 30-45-degree angle on the screen.
3. If you see a pale image, the backlight doesn't work. If you can't see the screen at all, the problem is deeper (matrix, plume, board).

2. Program causes: firmware failure and settings

Sometimes the backlight fails not because of a physical breakdown, but because of a software failure. TV, where firmware errors can cause the display to malfunction:

• 🔄 Reboot the TV. Turn it off for 1-2 minutes, then turn it on again. Sometimes it helps to reset the time errors.
• ⚙️ Reset to factory settings. Go to Settings. → The device → Reset → Settings reset. Attention: this will delete all installed apps and accounts!
• 📥 Firmware update. Go to Settings. → On TV. → Update the system and check for updates.

If the lighting is back on after the reset, but after a while the problem has returned, it is likely that the unstable firmware is to blame. USB. Instructions for your model can be found on the official website of Xiaomi or on forums like 4PDA.

⚠️ Warning: If the TV stopped turning on after the firmware update (black screen, no sound), there may have been an installation error, in which case you will need to flash through service mode (need to use the device). OTG-cable).

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Before resetting, write down the model of your TV (located on the sticker at the back) – this will help you quickly find the right firmware.

3. Check of power supply and backlight inverter

If the software methods didn't work, it's time to look inside the TV (LED-driver: two key parts that are responsible for applying voltage to the backlight, and their failure often leads to the absence of images when working sound.

To check the power supply:

1. Turn off the TV and remove the back cover (a cross screwdriver will be required).
2. Find a power supply - this is a large board with many capacitors and a radiator.
3. Carefully inspect it for bloated condensers, burnt tracks or the smell of burns.
4. If you see damaged elements, they need to be replaced (this requires a soldering iron and experience with electronics).

The backlight inverter is usually located next to the power supply or on a separate small board, and its task is to convert a constant voltage into a variable for power. LED-Signs of malfunctioning inverter:

• 🔌 The TV is turned on, but after 2-3 seconds it is turned off (overload protection).
• 💥 Clicking or cracking from inside the body when switched on.
• 🌡️ Strong heating of the inverter (you can check with your hand after 5-10 minutes of work).

If the inverter burned, it can be replaced with a new one (cost - from 1000 to 3000 rubles depending on the model). TV 4S 55) spare parts are easy to find on AliExpress or in Russian electronics stores.

4. Repairs. LED-tape: replacement of burned diodes

If the power supply and inverter are OK, but the backlight is not working, the problem is most likely in the LED-In Xiaomi TVs, they are located on the perimeter of the screen (in models with direct illumination) or on the back (in models with matrix illumination.

To check and replace LED-ribbon:

1. Remove the back cover and gently disconnect the plumes going to the matrix.
2. Find it. LED-tapes – they are glued to a metal body and connected to an inverter.
3. Carefully examine the tapes for darkened or burned diodes (they will be black or stained).
4. If you find damaged diodes, you can try to replace them separately (you need a soldering iron with a small sting and new ones). SMD-diodes).
5. If the entire tape is burned, it is easier to replace it entirely (cost - from 500 to 2 000 rubles per piece).

Replacement LED-Pay attention to the following points:

• 🔧 Connection polarity. Tapes usually have labels on them. + And-- don't confuse!
• 🧲 Some Xiaomi models have a magnetic screen – don’t lose it when disassembling.
• 🔥 Overheating. When soldering, use a soldering iron with a power of no more than 30 watts, so as not to damage the matrix.

⚠️ Note: If you are replacing LED-In the tapes, be sure to check the resistance of the circuit with a multimeter before turning on the TV!

Screwdriver cross (PH2)

Plastic mediator for disassembling the body

Solding iron (if you need to replace diodes)

New LED-tapes or diodes (select in advance on the TV model)

Multimeter to check the circuit

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5. Problems with matrix and plumes

Less commonly, but still, there are cases where the backlights don't work because of damage to the matrix or disconnected plumes, and this is true if the TV has fallen, been hit or disassembled before.

How to check:

1. Turn off the TV and remove the back cover.
2. Carefully disconnect the plumes going from the motherboard to the matrix.
3. Check them for damage, oxidation or breakage. If the contacts are contaminated, wipe them with alcohol.
4. Make sure that the plumes are tightly inserted into the connectors (sometimes they just fall out during transportation).

If the plumes are fine but the backlights are not working, the matrix itself may malfunction, in which case repairs will be expensive (replacing the matrix costs 50-70% of the price of a new TV), so it is more advisable to consider buying a new device.

Signs of a damaged matrix:

• 🖥️ Vertical or horizontal bars on the screen that are independent of the image.
• 💥 Cracks or physical damage on the screen surface.
• 🔄 Artifacts when viewed (flickering, color distortion).

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If the TV was falling or subjected to mechanical stress, 80% of the time the problem lies in the plumes or matrix, not in the backlight.

6. Prevention: how to prolong the life of lighting

To avoid future lighting problems, follow these guidelines:

• 🌡️ Control the temperature. Don't put the TV in closed niches or near heat sources. Overheating shortens lifespan. LED-diode.
• ☀️ Adjust the brightness. Don't use maximum brightness unnecessarily. Optimal level is 60-70%.
• ⚡ Use a voltage stabilizer. Power surges on the grid can knock out the power supply or inverter.
• 🔌 Turn off the TV during a thunderstorm or prolonged downtime (more than 2-3 days).
• 🛠️ Update your firmware regularly. The manufacturer often releases patches that fix backlight control errors.

Also, avoid frequent on/off of the TV, which puts a strain on the power chain, and if you watch TV occasionally, use the Energy Saving mode in your settings.

7. When to contact the service: the cost of repair

If you’ve tried all the methods in this article, but the backlight never worked, it’s time to turn to the professionals. Here are the estimated prices for repairs in service centers (current for 2026):

• 🔧 Replacement of the power supply: 1,500–3,500 ₽ (model-wise).
• 💡 Replacement LED-tapes: 2,000 to 5,000 ₽ (The price includes work and spare parts).
• 🔄 Replacement of inverter: 1,000–3,000 ₽.
• 🖥️ Replacement of the matrix: 10,000–30,000 ₽ (often unprofitable).
• 📟 Diagnosis: 500–1,500 ₽ (Sometimes free of charge for further repairs).

Should I repair it? Depends on the age of the TV.

• 🆕 Less than 3 years – repairs are warranted, especially if warranty is in place.
• 🔄 3-5 years – it makes sense if the cost of repairs does not exceed 30% of the price of a new TV.
• ❌ More than 5 years, it is often cheaper to buy a new TV.

Before visiting the service, take a picture of the TV model (a sticker on the back) and describe the symptoms as accurately as possible, which will help the wizard to determine the cause faster.

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In official Xiaomi service centers, repairs will cost more, but you will get a guarantee for work. In informal workshops, prices are lower, but the risk of running into poor repairs is higher.

FAQ: Frequent questions about Xiaomi backlight repair TV