Modern Xiaomi TVs, particularly the Mi TV 3S, are distinguished by a premium design and a thin profile, but these characteristics make their disassembly difficult and risky procedure for an untrained user. The question “Xiaomi 3S how to disassemble” often arises when you need to replace a broken matrix, failed power supply or conduct deep cleaning of dust.
Before any manipulations, you should be aware that opening the case automatically voids the manufacturer's warranty obligations. If your TV is still in warranty service, we strongly advise you to contact an authorized service center, since self-intervention can lead to irreversible damage to the electronics. However, if the warranty has already expired or repairs in the SC are impossible, a detailed study of the design will allow you to carry out the work carefully.
The dismantling process requires not only special tools, but also a certain skill, since the plastic latches in the 3S model are quite fragile and easily break when carelessly jerked. In this article, we will discuss in detail the steps of removing the back cover, disabling the plumes and removing the main modules. You will learn what nuances the design of this popular model hides and how to avoid typical repair errors.
Necessary tools and measures for pre-training
The success of the Xiaomi Mi TV 3S disassembly operation depends 90% on the proper preparation of the workplace and the availability of a specialized tool. A conventional cross screwdriver will not be enough here, as the manufacturer uses screws of various lengths and types of threads, as well as hidden mounts. It is crucial to organize good lighting to see small details and not lose screws.
You will need a toolkit that allows you to safely remove the back panel without damaging the paintwork and plastic elements of the case. Particular attention should be paid to tools for working with latches, since the TV body is assembled mainly on clips.
- 🛠️ Precision screwdriver set (PH0, PH1, PH2) screw-twisting.
- 🔪 Plastic mediators or shoulder blades for opening the body without scratches.
- 🧤 Antistatic gloves to protect electronics from static electricity.
- 📦 Containers with dividers for sorting screws by disassembly stages.
- 💡 Powerful flashlight or lamp for illuminating internal connections.
⚠️ Before starting work, be sure to disconnect the TV from the power grid and let it stand off at least 15-20 This is necessary for the full discharge of the capacitors in the power supply, high residual voltage in which it can be dangerous.
The work surface should be flat, clean and large enough to place the removed matrix face down on soft tissue. The use of fuzzy fabrics is not recommended, since the pile can get inside the device and settle on boards. Also prepare a magnetic board or a sheet of paper on which you can schematically arrange the screws in the order of their extraction.
Removal of the stand and removal of the back cover
The first step in disassembling the Xiaomi 3S is to remove the stand, which can be installed in two ways depending on the modification. In some versions, the legs are attached with two powerful screws from the bottom, in others they are fixed with latches and require simultaneous pressing on the retainers. Do not use excessive force if the stand does not lend itself, you better look carefully at the mounting site for hidden screws under decorative plugs.
After removing the legs, you need to flip the TV screen down onto a pre-prepared soft surface. The back cover is held around the perimeter by a lot of plastic latches and several screws, which are often hidden under stickers or in recesses near the ports. Carefully probe the perimeter of the case with your fingers to detect all the attachment points.
☑️ Preparation for lid removal
To open the case, use a plastic blade, inserting it into the junction between the front and rear panels. Move around the perimeter, sequentially clicking clips. A characteristic click will signal the successful release of the site. It is important not to sink the tool too much, so as not to damage the internal plumes that can be stretched at the edges of the case.
Be especially careful at the bottom of the TV, where the control unit and ports are located. There are often the main plumes of the matrix connection with the board. A sharp jerk of the cover can lead to a break in the backlight plume or damage to the connectors. After snapping all the latches, do not rush to remove the lid completely, first lift it and visually assess the situation.
Disabling plumes and dismantling metal screens
When you remove the back plastic panel, you will see the inside of the Xiaomi 3S TV. Most of the space is occupied by metal screens that protect electronics from interference and fix the boards. To get to the main components, you need to carefully unscrew these screens and turn off the connecting cables.
First of all, the external cables that go to the ports if they interfere with further disassembly, then you should pay attention to the plumes that connect the motherboard to the power supply and the T-Con board, these connections are very sensitive to mechanical stress and require delicate handling when disconnected.
- 🔌 Carefully lift the latchers of the plume connectors up before removing the cable.
- 🔩 Unscrew screws fastening metal casings using a magnetic screwdriver.
- 📸 Take a photo of the location of all the plumes before turning them off for the correct assembly.
- 🧹 Check the status of contacts for oxidation or contamination.
Metal screens are often mounted with screws that can be closed with serial number stickers. When removing them, try not to damage the stickers if you plan to keep the warranty (although the fact of opening will still be noticeable). Once the metallization is removed, access to the main board, power supply and control boards matrix is opened.
⚠️ Attention: The plumes in Xiaomi TVs are very thin and easily torn.Never pull the plume itself, always hold on to the hard plastic tip of the connector. Damage to the tracks of the plume will cause the screen or sound to malfunction.
When you turn off the matrix plumes (LVDS or eDP), be very careful. These cables are responsible for transmitting the video signal and often have double locking. First the pin down bar is withdrawn, then the lock is raised, and only then the plume is removed. Reverse assembly requires precise installation before the lock clicks.
Replacement of the power supply and motherboard
The power supply in Xiaomi 3S is usually located in the lower or central part of the body and is a massive metal block, its replacement is required for problems with the TV turn on, blinking backlights or lack of reaction to the remote, it is usually mounted with four screws to the metal frame of the case.
Before you remove the power supply, you need to disconnect all the wires and connectors that are suitable for it. Notice the high-voltage wires that go to the light inverter. They may have specific connectors that require careful handling. You can't twist or bend these wires at an acute angle.
Diagnosis of the power supply unit
The 3S Main Board is integrated with ports and is conveniently accessible. Replacing it will require disconnecting all the plumes, including Wi-Fi antennas (if they are connected by separate connectors) and cables to the control buttons. When installing the new board, make sure the firmware version matches the matrix model, otherwise you may need to flash the hardware back.
The new modules are installed in reverse order, so it's important to ensure that the connectors fit tightly and the screws are securely fixed, and the vibrating of the TV speakers can weaken poorly twisted mounts over time, causing extraneous sounds or disrupting contact.
Difficulties in replacing the matrix and backlight
The most difficult and risky part of the Xiaomi 3S disassembly is to replace the matrix or LED backlight. To access these components, you need to remove the metal frame holding the screen panel itself. This operation requires a perfectly flat surface and, preferably, the help of a second person, since the screen diagonal is large and the glass is extremely fragile.
The LED backlight in this model is located on the lower or lateral edges of the matrix, depending on the type of panel used (Direct LED or Edge LED). To replace it, you often have to disassemble the matrix itself, removing filters and diffusers, which at home is fraught with dust, which will then be visible as black dots on the screen.
| Component | Difficulty replacing | Risks. | The necessary tool |
|---|---|---|---|
| Back cover. | Low. | Broken latches | Mediator, screwdriver. |
| Power supply | Medium | Residual voltage | Setting screwdrivers |
| Maternity fee | Medium | Damage to plumes | Tweezers, screwdriver. |
| Screen matrix | Tall. | Screen break, dust | Suctions, help from an assistant. |
If your goal is to replace the backlight, keep in mind that Xiaomi 3S often uses high-power LED lines. When replacing, it is recommended to change the entire set at once, since burnout of one diode often leads to overload and soon failure of the rest of the circuit.
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When assembling the TV after replacing the matrix, carefully wipe the inside of the screens and filters with a special lilaless wipe. Any dust dust left inside will be illuminated and spoil the image.
Television assembly and initial start
The main rule of thumb is not to tighten the screws "to the point" at once, first make all the mounts, check for no distortions, and then evenly fix the elements. Pay special attention to the laying of the plumes: they should not be stretched or squeezed by the metal parts of the body.
After you put the back cover and snap all the clips, put the TV on the stand and plug the power. The initial launch may take longer than usual, as the system conducts self-testing. If the screen catches fire, the image and sound appear, the repair can be considered successful.
- ✅ Check the operation of all ports HDMI and USB post-assembly.
- ✅ Make sure there is no gap between the front and back panels.
- ✅ Test the operation of the Wi-Fi module and remote control.
- ✅ Check the absence of extraneous vibrations of the body when working.
In some cases, after replacing the main boards, you may need to calibrate the screen or reset the settings to the factory. → General. → Reset: If the TV is not turned on or the image is missing, re-disassemble the device and check the reliability of all connections.
⚠️ Warning: If you hear a crackling, burning smell or sparkling after assembly, immediately disconnect the TV from the network, indicating a short circuit caused by improper assembly or hitting a foreign object on the board.
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Quality assembly is more important than speed: carefully check each plume and screw before closing the case to avoid re-disassembly.