Disassembly Xiaomi Mi TV 4A: detailed instructions with photos and expert advice

Xiaomi Mi TVs TV 4A gained popularity due to the combination of affordable prices, high-quality screen and functionality based on Android TV. However, even the most reliable technique requires maintenance over time: dust cleaning, lighting replacement or motherboard repair. If you encounter a malfunction or want to carry out preventive cleaning, self-disassembly can save time and money. But incorrect actions lead to damage to the plumes, cracks on the body or breakage of fasteners.

This article will help you understand Xiaomi 4A (The 32, 43, 50, 55′′ models are risk-free, and we will describe in detail each step, from tool preparation to removal of the back cover and extraction of key components, focus on the typical mistakes that beginners make, and give tips on handling fragile parts. If you’ve never taken a TV apart, start by watching video tutorials and evaluating your skills: some operations require accuracy and patience.

Before you start, consider: Xiaomi warranty is canceled when you open the case yourself. If your TV is warranty, contact the service center. Also remember that inside the case are components sensitive to static electricity - the motherboard, T-CON (Matrix controller) and power supply: wear gloves or use an antistatic bracelet.

Preparation for disassembly: tools and security measures

For disassembling Xiaomi Mi TV 4A You're going to need specific tools. Don't use any tools at hand (knives, screwdrivers, the wrong size) -- that's almost guaranteed to cause scratches on the body or mounts to break:

• 🔧 Plastic blades (2-3 - To separate the latches of the shell. Metal tools will leave traces.
• 🔩 Cross screwdriver (size) PH2) — For the rear cover screws, some models use hexagonal screws.
• 🧲 Magnetic mat or container – so as not to lose small screws and parts.
• 📸 Smartphone – take photos of each stage of disassembly, especially the location of the plumes.
• 🧤 Antistatic bracelet (optional) – to protect electronics from static discharge.

Before starting work, disconnect the TV from the network and wait for the power supply to completely cool down (10-15 Place the TV screen down on a soft surface, such as a bedspread or a foam substrate. Avoid hard desks: pressing the body can damage the matrix.

⚠️ Attention: In Xiaomi models 4A 50" and 55" back covers are not only attached to the screws, but also to plastic latches around the perimeter!

If you are disassembling a TV for dust cleaning, prepare also:

• 🧹 Soft brush (for example, for makeup) – to remove dust from radiators and boards.
• 💨 A cylinder with compressed air - for blowing out hard-to-reach places.
• 🧴 Alcohol wipes - for cleaning the contacts of plumes.

Removal of the back cover: step-by-step instructions with a photo

So let's start with the most critical part, which is removing the back panel. 4A it's attached to 8-12 And then there's screws (depending on the diagonal) and plastic latches:

Step 1: Unscrew all the screws around the perimeter of the lid. In the 32" and 43" models, they are hidden under rubber plugs -- put a plastic blade on them. The 50" and 55" screws are usually open.

Step 2: Take a plastic blade and walk gently around the perimeter of the lid, pressing the latches. Start at one of the corners, it makes it easier to control the process. Don't apply force: if the lid doesn't lend itself, check if all screws are unscrewed.

Unconnected and cooled.

The screws are unscrewed and stacked in a container

Plastic shoulder blade ready.

Photo of initial state taken-->

Step 3: When all the latches are snapped, remove the lid and put it aside. Be careful: there may be pins attached to the lid of the control buttons (in models with physical buttons on the body).

Under the lid, you'll see:

• 📺 Matrix with frame and lighting system (LED-ribbon).
• 🖥️ Motherboard (usually right or center).
• ⚡ Power supply unit (left, in a metal casing).
• 🔌 T-CON board (matrix controller, small board at the bottom edge of the screen).

⚠️ Attention: In Xiaomi models 4A 2018 power supply can be screwed to the body with separate screws.Do not try to remove it unnecessarily - this is a risk of damaging high-voltage capacitors!

Extraction of motherboard and power supply

If the purpose of disassembly is to repair or replace the motherboard (for example, in the absence of an image or Wi-Fi problems), proceed as follows:

1. Disconnect all the plumes. The motherboard usually has:

• 📶 schleife Wi-Fi/Bluetooth antennae (thin black wire).
• 🔌 schleife T-CON (wide gray, goes to the matrix controller).
• ⚡ Power supply plume from the power supply (red / black wires).

Carefully pull the plastic connectors without pulling the wires. If the plume does not come out, check if there is a latch (usually white or black).

2. Unscrew the board. The motherboard is attached to the 4-6 Some models may have a metal gasket underneath to remove heat -- don't lose it when you remove it.

3. Power Board is usually located on the left.

• Disconnect all wires leading to the matrix and motherboard.
• Unscrew the screws (usually) 3-4 stuff).
• Notice high-voltage capacitors -- they can keep a charge even after they're off the grid! Don't touch them with your hands.

If the power supply is swollen or smells of smoke, it can not be turned on - it needs replacement. 4A 1000 μF capacitors often fail × 16B (can be replaced with analogues with a larger capacity, for example, 1000 μF) × 25B).

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Before you unplug the plumes, take a picture of their location or label them with duct tape with numbers, which will eliminate confusion when you reassemble them.

Disassembly of lighting and matrix: when necessary

Replacement LED-The lighting, or the matrix itself, is one of the most difficult operations:

• 💡 Dark spots on the screen (individual LEDs have failed).
• 🔴 vertical or horizontal bands (problems with a matrix or T-CON pay-off).
• 💥 Screen cracks (only matrix replacement).

To access the illumination, it is necessary:

1. Remove the metal frame holding the matrix (attached to screws and latches).
2. Disconnect the plumes from T-CON pay-off.
3. Carefully lift the matrix and put it down on a soft surface.

Under the matrix you will see a diffuser (white plastic sheet) and LED-To replace the lights, to replace the lights:

• Unplug old tapes (they are glued to bilateral scotch).
• Install new ribbons while observing polarity (+ and –).
• Check the backlight before the final assembly - connect the power supply and briefly turn on the TV.

⚠️ Note: The Xiaomi Matrix 4A Even a little pressure on the screen can cause cracks.

In models 2019-2020, backlighting is often made on flexible tapes with a pitch of LEDs of 6 mm. When replacing, use tapes of the same type - otherwise problems with the uniformity of lighting may occur.

Cleaning TV from dust: a step-by-step algorithm

If the purpose of the disassembly is preventive cleaning, focus on three key areas:

1. Radiators (on the power supply and motherboard).
2. Ventilation holes (especially in models with active cooling).
3. Contact plumes (oxidation leads to artifacts on the screen).

Use a soft brush for dry cleaning and a compressed air cylinder for purging. Avoid vacuuming - it can damage small parts. Alcohol wipes (at least 70% alcohol) are suitable for cleaning contacts.

Pay particular attention to:

• 🔥 Radiator power supply - the accumulation of dust here leads to overheating and failure.
• 🖥️ motherboard processor (usually under a metal radiator).
• 💡 LED-lighting tapes - dust on them reduces the brightness of the screen.

After cleaning, let the parts dry. 10-15 Do not use a hair dryer or other heating appliances to speed up the process.

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Cleaning the TV is recommended every 1-2 years, even if there are no visible problems, this prolongs the life of the power supply and prevents overheating.

Common Mistakes in Disassembly and How to Avoid Them

Even experienced craftsmen sometimes make mistakes that lead to additional breakdowns, and here are the most common ones and ways to prevent them:

Another common problem is damage to the plume. T-CON This plume is thin and brittle, and it requires soldering to replace it, and if you notice that after assembly, vertical stripes appear on the screen, most likely the plume is damaged or oxidized contacts.

To minimize the risks:

• 📸 Take pictures of each step – it will help with the reverse assembly.
• 🔧 Store the screws in separate containers (such as ice trays).
• ⏱️ Take your time – the average time of disassembly for a beginner: 1.5-2 hours.

Build TV after disassembly: inspection and testing

The assembly is in reverse order, but there are several nuances:

1. Make sure all plumes are tightly connected - until the snap of the locker.
2. Check whether there are any foreign objects (screws, pieces of plastic) inside the body.
3. Twisting the screws cross-cross to avoid skewing the cover.

Don't turn on the TV immediately after assembly.

• 🔍 The gaps between the lid and the housing (indication of not latched latches).
• 🔌 Visible damage to plumes or wires.
• 💨 Extraneous noise (for example, rattling screws inside).

For testing:

1. Connect the TV to the network and turn it on.
2. Check the uniformity of the light (are there any dark spots).
3. Test all ports (HDMI, USB, 3.5 mm).
4. Connect to Wi-Fi and check Android TV.

If the TV is not on:

• 🔌 Check the connection of the power supply and the plume to the motherboard.
• 💡 Make sure that LED-The lighting tapes are connected correctly.
• 🔧 If the problem persists, it may be that the motherboard or power supply is damaged.

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If you have new problems after assembly (like screen flickering or no sound), chances are you forgot to plug in one of the plumes or damaged it. Take the TV apart and check all the connections.

FAQ: Frequent questions about Xiaomi disassembly 4A