Why the curtain on Xiaomi Mi TV 7 fails and when to change it
The curtain (or) IR-filter) in Xiaomi Mi TVs TV 7 is a thin film that protects the matrix from infrared radiation and dust, while correcting color reproduction, and over time it can lose transparency, become covered with microcracks or completely detach, leading to scuffs, cloudy images or color distortions. If you're on your Mi screen TV 7 there were white spots that do not disappear when wiping, or the picture became dull - with a 90% probability the problem is in the curtain.
The manufacturer does not plan to replace it as a service operation, but with a careful approach, you can do it yourself, the main thing is not to confuse the curtain with the polarization filter (it is thinner and closer to the matrix). In this article, we will discuss the entire process from diagnosis to final assembly, taking into account the specifics of the Mi TV 7 model (including versions 75, 65" and 55").
⚠️ Warning: Replacing the curtain requires disassembling the TV and working with fragile components. If you have never repaired the equipment, it is better to contact the service center - an error can damage the matrix or backlight.
How to diagnose a curtain malfunction: 5 signs
Before you take apart the TV, make sure the curtain is the problem.
- 🔍 White stains or spots that are not removed by scrubbing the screen (often appearing at the edges).
- 🎨 Distorted colors: the picture becomes too warm or cold, contrast is lost.
- 🌫️ A murky image, as if the screen is covered with a slight haze (especially noticeable on a black background).
- 🔥 Artifacts in bright light: if you point a flashlight at a screen that is turned off, the curtain defects become visible as dark stripes.
- 📉 Deterioration of brightness without changing the settings (related to clouding of the filter).
If any of these signs are present, the curtain should be replaced. For accurate diagnosis, you can use a backlight uniformity test: turn on the Xiaomi Mi TV 7 monochrome background (for example, gray) through the Settings menu → Picture → Test sample and carefully examine the screen from different angles.
What curtain to choose for Xiaomi Mi TV 7: original vs analogues
The original curtain for the Mi TV 7 has the MDZ-23-AB (for models from 2022-2026), but it is difficult to find on the market. Most of the time, they use generic analogues from 3M, Nitto or LG Chem, which are suitable for optical characteristics.
| Parameter | Requirements for Mi TV 7 | Consequences of non-conformity |
|---|---|---|
| Thickness | 0.18-0.22 mm | Too thin - will not protect against IR radiation; too thick - will worsen the viewing angles. |
| Capacity | 92–95% | Below 90%, the picture will be dim; above 96%, there will be no IR filtering. |
| Reflection factor | <1.5% | A high coefficient will lead to glare on the screen. |
| Size | 2-3 mm more than the matrix | A smaller size will not cover the entire area; a larger one will prevent assembly. |
Where to buy:
- 🛒 AliExpress: Search by request «IR filter for Xiaomi TV 7» or «TV polarizer film 55/65/75 inch." Price - from 1500 before 3000 ruble.
- 🔧 Service centers: some sell parts separately (check by phone).
- 📦 Telegram Groups: Often sell leftovers after repairs (e.g, @xiaomi_tv_parts).
Critically, check the diagonal of your Mi TV 7 before you buy - the curtains for 55, 65 and 75 are not interchangeable! Also make sure that the kit comes with two protective films (on both sides of the filter) - they can not be removed until the installation.
Preparing for replacement: tools and safety
You will need to work:
T5 screwdriver (for screws of the back cover)
Plastic blades (2-3 pieces) for dissociating the housings
Building hair dryer (power 1500-2000 W) for softening glue
Screen suction cups (diameter 5-7 cm, 2 pcs.)
Scalpel or stationery knife (for cutting curtains)
Alcohol wipes (70% isopropyl alcohol)
Nitrile gloves (to avoid leaving fingerprints on the matrix)
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⚠️ Attention: Work in a clean, dust-proof environment, even one speck of dust between the curtain and the matrix will be visible as a black dot on the screen. If there are carpets or upholstered furniture in the room, cover them with a damp cloth, this will reduce the circulation of dust.
Also prepare the working surface:
- 📏 Spread out a soft towel or foam mat (so as not to scratch the screen).
- 🔌 Turn off the TV at least 30 minutes before disassembly (capacitors can retain charge).
- 📸 Take a picture of the back cover with screws - this will help not to confuse them when assembling.
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If you don’t have screen suction cups, they can be replaced with wide tape (stick the strips cross-cross to the glass and gently pull up).
Step-by-step: how to remove the old curtain from Xiaomi Mi TV 7
This is the most important stage.
- Remove the back cover: Unscrew all the screws (usually 10-12 pieces) and gently tuck the lid with a plastic blade. Start at the bottom edge, there are weaker latches. Do not force if the lid does not respond: check if all the screws are twisted.
- Disconnect the matrix plumes: Take a picture of their location! The plumes are attached to the latches -- gently pull the black tongue up, then pull the plume out. Don't pull the wires!
- Remove the frame: The frame is held on double-sided tape and plastic clips. Warm up the screen edge with a hair dryer (50-60°C) and put the frame with a spatula. Start at the top corner, which is usually less glue.
- Separate the curtain from the matrix: This is the hardest part. The curtain is glued around the perimeter. Dry dryer the entire screen (hold at 10 cm, 40-50°C) for 2-3 minutes. Then gently tuck the angle of the curtain with a scalpel and slowly pull it up. If it resists, warm it further. Don't use metal tools directly on the matrix!
⚠️ Attention: If the curtain is torn when removed, don't try to remove the fragments with your nails or tweezers - use tape. Stick a piece of tape to the debris, then rip it off. Repeat until all the parts are removed.
What to do if the curtain is glued to the matrix?
Installation of a new curtain: how to avoid bubbles and dust
Now we're going to edit, and the rule is, don't touch the inside of the curtain (the one that's going to fit the matrix), and even a fingerprint can ruin the picture.
- Clean the matrix: wipe it with a lilac-free napkin dipped in isopropyl alcohol. Move from center to edge without pressing. If there are any glue particles left, gently scrape them off with a plastic spatula.
- Prepare a new curtain: Remove only the top protective film (the one with the manufacturer's logo), and don't touch the bottom one, because it protects the adhesive layer.
- Apply the curtain to the matrix: Start at the top edge: combine the curtain with the matrix and gently press the center, then smooth it with a soft roller or credit card from center to edges, which will help avoid bubbles.
- Remove the bubbles: If they appear, don't panic. Take a needle (pre-wired with alcohol) and gently puncture the bubble, then smooth out the place.
⚠️ Warning: If you get iridescent divorces after you put the curtain on the screen, you've got the sides mixed up, you need to take it off and glue it to the matrix with the glue side (usually the side with the manufacturer's logo).
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The ideal curtain installation is when there is no dust or bubble between the curtain and the matrix, and even microscopic defects will be visible when the TV is turned on.
Build the TV and check the results
When the curtain is installed, it remains to assemble the TV in reverse order:
- Secure the screen frame: Use a new double-sided scotch (e.g. 3M VHB). warm up the edge of the frame with a hair dryer before sticking it, this will improve adhesion.
- Connect the plumes: Make sure they get into the connectors before you click. A skewed plume can lead to artifacts on the screen.
- Install the back cover: Twist the screws cross-cross to avoid skewing the body.
After assembly, turn on the TV and check:
- 🔎 Lighting smoothness: are there no dark spots or light stripes.
- 🎨 Color rendering: Compare with reference image (e.g. test template from YouTube).
- 🔍 Screen Cleanliness: Point the flashlight at an angle – curtain defects will be visible as dark spots.
If the image is perfect, congratulations! If it's not, you'll have to repeat the process.
- 🌀 Air bubbles (you need to glue the curtain over).
- 🧹 Dust between layers (complete disassembly and cleaning required).
- 🔄 Turn the curtain over (change sides in places).