Xiaomi M1804C3DG, known globally as Redmi 6A, is a classic representative of the budget smartphone segment. Despite the simplicity of design, the device requires a careful approach when dismantled, since the body is made of plastic, which is easy to damage if mishandled. Owners often face the need to replace a broken display or a bloated battery, and knowing the right sequence of actions is critical here.
The process of dismantling the Xiaomi M1804C3DG begins with an assessment of the condition of the external mounts and the preparation of the workplace. Don’t ignore this stage, because the loss of a small screw or damage to the plume can turn a simple repair into a complex technical problem. In this article, we will take a detailed look at each step necessary to safely open the case and access internal components.
The challenge is that the back cover is glue-based and has no visible screws on the outside, and it requires tools and patience to keep the frame from splitting. If you're first in the business of repairing mobile equipment, carefully study each item before you start.
Tools and workplace preparation required
To properly disassemble the Redmi 6A, you will need a minimal but specific set of tools. Using inappropriate items such as a knife or pin greatly increases the risk of damage to the case and internal boards. Professional approach begins with the right toolkit.
First of all, you will need a suction cup or a special opener for working with adhesive joints. Also, an indispensable assistant will be a thin plastic spatula (mediator), which will allow you to snap latches without scratching. Metal tools should be used with extreme caution, only for working with metal screens.
Be sure to prepare the screw folding capacity, as the Xiaomi M1804C3DG uses different lengths of fasteners. By confusing them when assembled, you can punch through the motherboard or damage the thread in plastic racks. Order is also important for plumes and small parts.
- 🔧 Set of screwdrivers (cross-crosses) PH000, PH00) screw-twisting.
- 🧲 Magnetic mat or organizer for sorting screws by disassembly stages.
- 🔥 A hair dryer or heating plate to soften the glue under the back cover.
- 🧤 Antistatic gloves to protect electronics from static voltage.
⚠️ Warning: Before starting any work, be sure to completely turn off the smartphone. Attempting to disassemble the on device can lead to a short circuit and irreversible failure of the power controllers.
Removal of the back cover and primary access
The first step in dismantling the Xiaomi M1804C3DG is to neatly separate the back panel. Since the screws are not here, the main fixation is provided by double-sided perimeter tape. Heating helps soften the adhesive, making the opening process safer for plastic.
Use a hair dryer to warm up the perimeter of the back cover evenly for 1-2 minutes.Do not hold the jet of hot air for too long at one point so as not to melt the plastic elements or damage the display matrix on the back.Temperature should be comfortable to touch with your hand.
After heating, insert a suction cup at the bottom of the back cover and pull up slightly, creating a small gap. In the resulting gap, gently insert a plastic blade and drive it along the perimeter, cutting the glue layer. Move slowly, feeling resistance.
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If the sucker is poorly maintained on a glossy surface, stick a piece of paint tape to the place of attachment for better grip.
When all the latches are snapped, don't try to pull the lid off abruptly. Make sure there's no glue left anywhere. Only after the perimeter is completely free can you gently lift the panel and put it aside.
Dismantling the protective bar and disconnecting the plumes
Under the back cover, there's a metal or plastic bar covering the main connectors and the battery. In the M1804C3DG, this bar is fixed with several screws that need to be twisted out. Their location can vary, so check the board carefully.
Once the bar is removed, the connectors of the plumes are accessed, and the first thing you need to do is turn off the battery plume to completely turn off the device, which is a critical safety step to prevent power surges when working with other components.
To turn off the plumes, use a plastic shoulder blade or finger, gently lifting the connector upwards. Never pull the plume wires themselves, as they break at the base. You must act strictly on the rigid plastic or metal tip of the connector.
☑️ Safe shutdown
Once the battery is turned off, you can sequentially disconnect the display and touchscreen plumes, which are usually located next to each other, and remember or photograph their location so that you don't confuse the connectors when you build them, because they can be the same length, but different shapes.
Removal of the battery
In Xiaomi smartphones budget segment, the battery is often fixed to two-way Scotch, which eventually loses its properties or, conversely, sticks to the dead. Removing the battery requires patience and caution, so as not to damage its shell.
If you have a special retractable tongue on your battery, use it gently by pulling the battery upwards. The Redmi 6A may not have these tongues, so you'll have to use a plastic card or a spatula. Push the battery gently, starting at the edge opposite to the connector.
It is strictly forbidden to use metal tools to tamper with the battery, puncture of a lithium polymer battery will cause instant fire or chemical reaction with the release of caustic smoke, which poses a real safety risk.
⚠️ Warning: If the battery is swelling, do not press it or try to pierce it. Remove it as carefully as possible, avoiding any mechanical damage to the battery housing.
To make it easier, you can slightly warm up the back of your smartphone (the battery area) with a hairdryer, which will soften the glue, and move the plastic tool under the battery in forward motions, gradually separating it from the body.
Replacement of the display and touch screen
Replacing the display module in the Xiaomi M1804C3DG often requires a complete removal of the frame or a careful separation of the broken glass from the body. In modern builds, the screen is often assembled with a frame, which makes it easier to do.
If you change the module assembled with a frame, the process is to reposition the motherboard, speaker and vibrator to a new body, which is the most reliable repair option, ensuring that the tightness (as much as possible in public sector) and no problems with glue.
Replacing only glass or a frameless matrix will require re-painting. The old module is heated and cut with a string or blade. The new screen is mounted on a special adhesive B-7000 or B-6000. Apply the adhesive uniformly around the perimeter and press the module.
| Component | Type of attachment | Risk of damage | Tool. |
|---|---|---|---|
| Back cover. | Glue + latches | Tall (cracks) | Suction, spatula. |
| Battery | Double-sided scotch | Critical (fire) | Plastic card |
| Display. | Glue/Frame | High (break) | Fryer, sucker. |
| Maternity fee | Screws. | Medium (trains) | Screwdriver PH00 |
After installing the new screen, take your time to twist all the screws. First, plug in the plumes and check the touchscreen and images are working, make sure there are no broken pixels and the touch touch responds throughout the area.
Work with the motherboard and lower module
The motherboard in the Xiaomi M1804C3DG is secured by screws and pressed with metal plates. To remove it, you need to turn off all the remaining plumes: antenna cables, button plume, charging port plume.
The antenna wires are often attached to the latches. Click them carefully, putting the base of the connector on the base. A sharp jerk can break the thin wire, which will lead to loss of network signal. After disconnecting all communications, unscrew all visible screws.
Nuances of antenna cables
The sub-board, where the charging connector and microphone are located, is usually mounted with screws to the plastic case, which is required for problems with charging or quiet sound during a conversation. Remove the speaker and vibrator if they interfere with access.
When you put the board back, keep an eye on the positioning holes. The board should be flat, smooth, and excessive force when twisting the screws can lead to cracks in the texture.
Assembly of the device and verification of functionality
The Redmi 6A is assembled in reverse disassembly. Start by installing the motherboard and connecting all the plumes. Make sure each connector is in place with a characteristic click.
Once the plumes are connected, install the battery and connect it to the circuit board, and then you can turn on the device for initial inspection, and if the screen catches fire and the phone responds to touch, you're on the right track.
Secure the protective bar with screws, remembering all the attachment points. Then apply a new glue or double-sided tape to the body to fix the back cover. Press the lid around the perimeter and let the glue grip for 15-20 minutes.
The final test involves testing all the features: calls, Wi-Fi, Bluetooth, cameras and sensors. Make sure the speaker sounds clean and the vibration is working correctly.
⚠️ Warning: If the phone doesn't turn on after assembly, don't panic. Check if the display and battery plumes are tight. Often the problem is with an incomplete connector.
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The rule of assembly is not to use force, and if a part doesn't fit, you've missed something or mistook orientation.