Disassembly Xiaomi Mi TV 4 Pro: detailed instructions with photos and warnings

Introduction: when you need to disassemble the TV Xiaomi Mi TV 4 Pro

Disassembling the Xiaomi Mi TV 4 Pro is a challenge that owners face when replacing the matrix, repairing the power supply or cleaning the cooling system. Despite the fact that the model was produced from 2018 to 2020, its modular design allows you to carry out many repairs yourself, subject to strict adherence to safety and understanding of the internal device.

In this article, you will find a step-by-step guide with photos of key steps, a list of tools you need, and unique tips to help avoid typical errors. We focus on points that are often missed in standard guides: for example, how to properly disconnect the matrix plumes without damaging the contacts or why you can not use metal screwdrivers for plastic latches.

If your Mi TV 4 Pro is no longer on, making extraneous sounds or overheating, disassembly can be the first step to diagnosis, but remember that mishandling internal components (especially the power supply and T-CON board) can lead to permanent damage or even fire.

Preparation for disassembly: tools and security measures

Before you start, make sure you have everything you need. To disassemble the Xiaomi Mi TV 4 Pro (L43M5-5APR, L55M5-5APR and similar models) you will need:

• ✅ Plastic blades (mediators) - to disconnect the latches of the back cover.
• ✅ Screwdriver kit: cross-haired PH2 and flat 3 mm (for matrix screws).
• ✅ Suction cup for removing the matrix (optional, but simplifies the process).
• ✅ Antistatic bracelet or gloves – to protect electronic components.
• ✅ Multimeter - to check the voltage on the power supply (if disassembly is associated with a malfunction).
• ✅ Containers for screws - so as not to confuse the fastener during assembly.

Pay special attention to the organization of the working space:

• 📏 Work on a flat surface covered with soft cloth (such as microfiber).
• 🔌 Disconnect the TV from the network at least 30 minutes before disassembly - this will discharge the capacitors in the power supply unit.
• 📸 Photograph each stage on your phone – this will help with the reverse assembly.

⚠️ Note: If your TV was in a wet room or was flooded, disassembly without first drying (minimum 48 hours in a dry place) can lead to a short circuit.

Removing the back cover: a step-by-step process

The back of the Mi TV 4 Pro is mounted on plastic latches and multiple screws, starting with the removal of the screws.

1. Turn the TV down on a soft surface, make sure there is no pressure on the screen, which can damage the matrix.
2. Unscrew all visible screws around the perimeter of the lid (usually 4-6 pieces, depending on the diagonal). In the 55" and 65" models, the screws can be hidden under plugs - carefully tuck them into a flat screwdriver.
3. Use a plastic blade to evenly flick the lid, starting at one of the corners. Apply force along the seam — don't try to plug the lid in the middle so as not to break the latches.

When you take the lid off, you'll see the inside of the TV, the basic components that you can see are:

⚠️ Warning: Do not touch the boards with your bare hands - static electricity can damage the chips. If you do not have an antistatic bracelet, regularly touch the grounded metal object (for example, a heating battery).

Unconnected for more than 30 minutes |

All screws unscrewed and stacked in a container |

Plastic blade ready for use |

Photo of the internal structure taken-->

Disconnection of plumes and connectors: what not to do

Once you remove the lid, you'll need to unplug the plumes and connectors to access the matrix or the boards, and that's the most critical step, because errors are the ones that cause breakdowns. Here are the key rules:

• 🔌 The plumes of the matrix (usually 2-3 pieces) are attached to T-CON To disconnect them, carefully lift the black or white latch up, and then pull the plume parallel to the board (not upwards!).
• 🔋 Power connectors (white or red) from the power supply to the motherboard have locks - press them from the side before extraction.
• 🎛️ The antenna cable (if connected) spins counterclockwise. Don't pull the cable, just by the metal connector.

Common mistakes that beginners make:

• ❌ Attempt to pull the matrix plume without raising the latch - this leads to a break in contacts.
• ❌ Using metal tools to tweak connectors - you can close contacts.
• ❌ Applying force to boards – they are mounted on racks that can crack.

If you need to replace the matrix, after turning off the plumes, unscrew the screws of the metal frame attachment (usually 8-12 pieces around the perimeter).

Diagnosis of malfunctions: what to pay attention to

If the disassembly is associated with the diagnosis of a malfunction, examine the following elements:

• 🔥 Power supply: Look for swollen capacitors, blackened resistors or burn marks.Multimeter check the output voltages (usually) 12V, 5V, 3.3V).
• 🖥️ Motherboard: inspect for chips, oxidized contacts or superheated chips (they may be coated with dark varnish).
• 💡 Matrix backlight: If the screen is turned on but the image is dim or missing, the problem may be in the LED-They're located at the edges of the matrix.

Common symptoms and their possible causes:

If you find swollen capacitors on the power supply, you can replace them yourself with similar capacity and voltage, but replacing the chips on the motherboard will require a soldering station and experience with the system. SMD-component.

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Before buying parts (such as a matrix or power supply), be sure to check the exact model of your TV. The serial number sticker is usually located on the back cover. For example, for Mi TV 4 Pro 55" you may need a V550HK1-L06 matrix, and for 43" - V320HK1-L06.

Building a TV: How to Avoid Mistakes

Building Xiaomi Mi TV 4 Pro after disassembly or repair requires as much attention as disassembly.

1. Make sure all plumes are connected before the click – an incomplete connection can lead to artifacts on the screen.
2. Twirl the screws cross-cross (like the wheels of a car) to evenly distribute the pressure on the matrix.
3. Before final assembly, turn the TV on and check its performance – this will save time if something was connected incorrectly.

Typical problems after assembly and their causes:

• 🔊 No sound: no speaker plume or connector on the motherboard.
• 📺 No signal. HDMI: Check the connection of cables to ports on the motherboard.
• 💥 TV does not turn on: perhaps the power supply is not connected to the motherboard or the train is squeezed.

⚠️ Warning: If after assembly the TV starts to emit a high-frequency squeak or the smell of burning - immediately disconnect it from the network! This is a sign of a short circuit, and further work can lead to a fire.

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The most common build error is the compressed plumes of the matrix, which should lie loose, without bending, and if you turn on the screen vertical stripes, the first thing you do is check the integrity of the plumes.

When the Disassembly is Inappropriate: Alternative Solutions

Not all malfunctions of Xiaomi Mi TV 4 Pro require disassembly, and in some cases, the problem can be solved with software or minimal intervention:

• 🔄 Logo hover: Try resetting through the service menu (click Menu) + Input on the remote when turned on).
• 🔊 Sound problems: check the settings in the Settings menu → Sound. → Output device.
• 📶 No Wi-Fi: Update the firmware through USB (instructions on the official website of Xiaomi).

If the TV is guaranteed, the disassembly will cancel it, and in such cases it is better to contact an authorized service center.

• Replacement of power supply: 3000–5,000 ₽.
• Replacement of the matrix: 15,000-25,000 ₽ (diagonally).
• Motherboard repairs: 4,000–8,000 ₽.

For Mi TV 4 Pro models older than 5 years, repairs may not be cost-effective, in which case it makes sense to consider buying a new TV, especially if the cost of repair exceeds 30-40% of the price of a similar new model.

FAQ: Answers to Frequent Questions