Replacement of curtains on Xiaomi TV: deal with the IR-filter-and-sensor

Replacing the curtain on a Xiaomi TV is a challenge faced by owners of models with infrared sensors (for example, Mi Mi). TV 4S/4A/4X or Redmi Smart TV). This detail is also known as IR-The filter, which is responsible for the correct operation of the remote control, protection from external light interference and sometimes automatic brightness control, can become dirty, crack or completely fail over time, which leads to malfunctions in the control of the TV.

In this article, we will understand how to replace the curtain yourself without contacting the service center. You will learn what tools you will need, how to disassemble the Xiaomi body. TV So, without damage, where to buy the original part and how to avoid typical installation errors, and we'll focus on calibrating the sensors after replacement, which is a step that's often missed, which can cause the TV to malfunction.

We warn you right away: the procedure requires precision and basic electronics skills, and if you've never mastered the technique, you'd better see a specialist, but if you're willing to try it, follow our photo and video example instructions.

What is a curtain on Xiaomi TV and why to change it

The curtain (or) IR-A filter is a thin plastic or glass plate placed in front of the TV's infrared sensors:

• 🔄 Filtration of external light – prevents false alarms of sensors from sunlight or lamps.
• 📶 Sensor protection – prevents dust and moisture from entering sensitive elements.
• 🎮 Correct operation of the remote control - without a filter, the signal from the remote can be distorted.
• 🌓 Automatic brightness control (in models with light sensor).

Signs that it is time to replace the curtain:

• ❌ The remote works only from a close distance or at a certain angle.
• ❌ The TV spontaneously switches channels or changes volume.
• ❌ The message No signal from remote control appears on the screen.
• ❌ The light sensor does not respond to changes in the light in the room.
• ❌ Visible damage: cracks, chips or severe filter contamination.

On most Xiaomi models (e.g. Mi) TV 4S 55" or Redmi" X50) The curtain is located at the bottom of the screen, under the decorative panel, and in some cases, it's integrated into the sensor module, which makes it difficult to replace it.

What tools and spare parts will be needed

Prepare everything you need before you start, and without the right tools, you risk damaging the body or the internal components of the TV.

Important: Do not use metal screwdrivers to open the case - they leave scratches and can damage plastic. Plastic blades must be thin (0.5-0.7 mm) to penetrate the gaps between the panels.

💡

Before you buy a curtain, check the article for your model. TV 4S 55" fits the filter numbered MDZ-23-AB. The article is usually indicated on an old part or in the documentation.

Step-by-step: how to disassemble a Xiaomi TV

Disassembling the TV is the most critical step, and errors here can damage the matrix or the board, and follow the instructions strictly by step.

Step 1. Turn off the TV.

Pull the plug out of the socket and wait 10-15 minutes. This is necessary to discharge the capacitors on the power board. Do not touch the boards with your bare hands - use an antistatic bracelet or periodically touch an earthed object.

Step 2. Remove the back cover.

1. Place the TV screen down on a soft surface (such as a blanket).
2. Unscrew all screws around the perimeter of the lid (usually 8-12 pieces, Torx size) T5).
3. Carefully apply a plastic blade to the lid, starting at the corners. It holds on the latches -- don't use excessive force.

Step 3. Unplug the plumes and cables

When you take the lid off, you'll see a metal screen (which protects against electromagnetic interference) unscrew it and put it aside.

• 🔌 Disconnect the plumes leading to the matrix (they are marked as LVDS eDP).
• 🔌 Disable power cables and antennas (usually connected to the Main Board board).
• 🔌 Take a picture of the location of all connectors – this will help with the reverse assembly.

Turned off the TV from the socket |

Waited 15 minutes to discharge the capacitors.|

Prepared a soft surface for laying TV|

Checked for all the tools.|

I took a picture of the location of the plumes.-->

Step 4: Get the sensor module out.

The curtain is usually located at the bottom of the frame, next to the power indicator. In most Xiaomi models, it is attached to a plastic module that is held on 2-4 screws. Carefully unscrew them and remove the module with the curtain.

How to remove the old curtain and install a new one

When the sensor module is removed, you can start replacing the filter, which requires special care, because the sensors are very sensitive to mechanical stress.

1. Removing the old curtain

In most cases, the curtain is fixed in the slots of the plastic case, so that it can be removed:

1. Carefully press the edge of the curtain on the inside of the module.
2. Put a blade on it and pull it up. Don't force it -- if the filter doesn't respond, check if there are any hidden latches.
3. If the curtain is cracked, collect the fragments with tweezers so that they do not fall inside the body.

2. Clearing the seat

Before installing a new curtain, be sure to clean:

• 🧹 Slots into which the filter is inserted (use a brush or compressed air).
• 🧹 Sensor contacts (wipe with a cotton swab soaked in isopropyl alcohol).
• 🧹 Inside the frame (remove dust and glue residues if any).

3. Installation of a new curtain

The new filter must enter the grooves effortlessly.

• ❌ Do not press on it - check if you have not mixed the sides (some curtains have a mark on them). TOP or UP).
• ❌ Make sure there is no debris or residue of old glue in the grooves.
• ✅ If the curtain is still not fixed, use a drop of superglue (only on the edges, not on sensors!).

💡

After you put the curtain in, make sure it's not touching the sensors, and even light pressure can distort their readings.

Calibration of sensors after changing the curtain

Without proper calibration, the TV may not respond to the remote or adjust the brightness incorrectly, a step that is often missed, causing problems after assembly.

Calibration of the infrared sensor (for the remote control)

1. Turn on the TV and check the response to the remote from a distance of 1-2 meters.
2. If the signal is missed, go to Settings. → Devices and accessories → DU remote.
3. Select IR Sensor Calibration and follow the instructions on the screen (usually you need to press a few buttons on the remote).

Calibration of the light sensor (if any)

In models with automatic brightness control (Mi) TV Q2, Redmi MAX 98”) the sensor sensitivity may be lost after the curtain is replaced:

1. Go to Settings. → Screen and sound → Brightness.
2. Turn off the automatic adjustment option.
3. Turn it on again, and the TV will recalibrate.

💡

If after calibration the remote still works poorly, try resetting the TV settings to factory (Settings) → On TV. → Resetting. This will help if the problem is in the software settings, not the hardware.

Common Mistakes and How to Avoid Them

Even with careful operation, you can make mistakes that will cause your TV to malfunction, and here are the most common ones and ways to prevent them:

⚠️ Warning: If the TV doesn't turn on after assembly, check to connect the matrix plume. Often it's forgotten to connect back or paste it in.

What if the problem has not disappeared after replacing the curtain?

• 🔍 Check the batteries in the remote control – they may have run out.
• 🔍 Test the remote on another device (e.g. air conditioning).
• 🔍 Examine the plume connecting the sensor module to the motherboard - it could have oxidized.
• 🔍 Update the firmware of the TV – in new versions of the software sometimes fix bugs with IR sensors.

Where to buy the original curtain for Xiaomi TV

Fake or non-original filters may not fit in size or let in excess light, which will lead to repeated failures.

• 🛒 AliExpress - look for sellers with a rating above 98% and reviews about compatibility with your model. Examples of trusted stores: Xiaomi Original Parts Store, Mi TV Accessories.
• 🛒 eBay – here often sell used original parts from disassembled TV sets.
• 🛒 Local service centers – some workshops sell parts with a guarantee.
• 🛒 Groups in VC/Telegram — for example, Xiaomi TV Repair or TV parts for the company.

Selection advice:

• 🔎 Always check the article of the curtain with the original detail.
• 🔎 Check the product photo – it should be visible Xiaomi logo or marking.
• 🔎 Avoid vendors who offer “universal” filters – they are rarely suitable.

The cost of the original curtain varies from 300 to 800 rubles depending on the model of the TV. Delivery from China takes 2-4 weeks, so if you need an urgent replacement, look for the part from local sellers.

FAQ: Frequent questions about changing the curtain on Xiaomi TV