Disassembling the Xiaomi Redmi 3 is often a necessity for owners who want to extend the life of their device.This popular budgetary is famous for its metal body, which makes the process of opening it more difficult than plastic counterparts. Repair at home requires accuracy, the right tools and a clear understanding of the design of the gadget.
The challenge is that the back cover is not removed for nothing, but is glued around the perimeter, and any careless movement can cause plumes to break or crack the metal, which is why it's important to study the theoretical part before you start work to minimize the risks.
In this article, we will take a detailed look at the process of dismantling the case, disabling the plumes and removing the main components, you will learn which screws are responsible for what and how to safely separate the display module from the frame.
Preparation of the workplace and tools
Before you start disassembling a smartphone, you need to organize a comfortable workspace, the table should be well lit, the surface should be clean and not slide, Ideally use an antistatic mat, but a regular sheet of white paper, which immediately shows the fallen small screws.
You'll need a specialized set of tools to work with mobile equipment, and the lack of the right tools often leads to the failure of the screws or damage to the body with sharp objects.
- 🔧 A set of screwdrivers with a cross sting Phillips #000 and #00.
- 🔥 Hair dryer for heating glue (industrial or household at a minimum).
- 🎴 Plastic mediators and screen suction cup.
- 🧲 Magnetic mat or screw sorting container.
⚠️ Note: Using a metal knife instead of a plastic mediator to smack the lid can short the battery or damage internal plumes.
Pay special attention to heating. The glue holding the frame should soften but not burn. Xiaomi Redmi 3 has a metal frame that heats up faster than plastic, so control the temperature with your finger.
Dismantling of the back cover and battery
The first step in the process of opening the phone is to remove the tray for the SIM-This is a standard procedure that frees up the interior space and prevents accidental damage to the tray when heated.
After removing the tray, turn on the hair dryer and warm the perimeter of the back cover evenly. Move the hair dryer around, lingering at the corners where the glue is usually the most. The heating process takes 2 to 4 minutes depending on the power of the appliance.
Temperature regime
When the metal is warm, but not burning, apply a suction cup to the bottom of the lid. Pull up, creating a small gap, and insert a thin plastic mediator into it. Drive the mediator along the perimeter, cutting the adhesive layer.
When you take the lid off, you'll see a plastic frame that hides the main board and the battery, and it's mounted on several screws and latches, and you'll be able to unscrew the visible screws carefully, and you'll be able to put the frame in the mediator.
Access to the battery is now available. Before disabling the motherboard plume, it is strongly recommended to drain the battery to a minimum or turn off the connector first of all to avoid short circuits when further working with the board.
Removal of the display module and frames
Replacing the screen or touchscreen is the most common reason users decide to disassemble Xiaomi. In the Redmi 3, the display module is glued into a metal frame, which makes it difficult, but you can try to remove the frame with the screen in order not to damage the matrix.
First, you have to turn off all the plumes that go to the motherboard, and they're under metal plates that are screwed, and unscrew them counterclockwise and take them off carefully.
The plumes are very fragile, so you can't pull them on the wire itself, so use tweezers or nails to fit the connector vertically up.
| Component | Location. | Firming | Risk of damage |
|---|---|---|---|
| Main plume | Centre de la carte | Protective bar. | High-pitched |
| Touchscreen plume | Side of the main | Protective bar. | Medium. |
| Button plume | The bottom part | Glue/Lacker | High-pitched |
| cable | Corner of the toll | Latch (removable) | Low. |
Once all communications are turned off, you can start heating the front, warm up the screen around the perimeter to soften the adhesive that holds the module in the frame, and be careful: overheating can lead to yellow spots on the matrix.
☑️ Pre-screen check
Use a suction cup and a mediator to separate the glass from the frame. The movements should be smooth, without jerking. If you feel strong resistance, add a little more heat.
Working with motherboard and subpayment
The motherboard in Redmi 3 is secure enough, and after removing all the shields and turning off the plumes, check the perimeter for hidden screws.
Often, the screws can be covered with stickers or under other structural elements. Carefully study the board in good lighting, so that nothing is missed.
The main board is removed along with the front camera and the talk speaker, which can be glued or fixed to it. Act slowly, checking each step.
⚠️ Attention: When removing the board, watch the main camera plume - it can be thrown over the edge of the board and easily breaks with careless movement.
The bottom board, where the charging connector and microphone are located, is usually held on screws and plastic latches. Unscrew the screws and gently tuck the board with a mediator.
The plume that connects the main and bottom boards, passes through special channels in the case, it must be very delicately drawn out of the grooves, without stretching or bending at a sharp angle.
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When assembling the phone, be sure to check the state of the sealing gum of the charging connector. If it breaks, dust will enter the body, which will lead to oxidation of the contacts.
Replacement of the battery and vibration motor
The battery in Xiaomi Redmi 3 is glued to the metal body quite firmly. To replace it, you will need to warm up the back of the device again if you have already closed the lid, or work with an open body.
There's a double tape underneath the battery, and to remove the battery, use a plastic card or a special tape, and hold the tape under the battery and saw it left and right, separating it from the body.
In no case do not try to tamper with the battery with a screwdriver or knife - a puncture of the lithium polymer battery will cause instant fire.
The vibromotor in this model is located at the bottom, often under or near the bottom board, and it's attached to adhesives or plastic seats, and it's easy to replace, but the key is to connect the connector properly.
Device assembly and function verification
The assembly is done in reverse order, but there are a few things that you can't ignore, and you need to do a primary start before you finish sealing the case.
Connect the display and battery plume, then press the power button. If the phone is on, check the touchscreen, speakers, microphone and cameras.
Once you're sure you're working, turn off your phone and start the final assembly. Apply the new B-7000 glue or use the pre-made adhesive frame for Redmi 3.
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High-quality sealing of the case after repair is the key to protecting electronics from moisture and dust in the future, do not save on glue.
When installing the back cover evenly press it around the perimeter and fix it with rubber bands or load for 15-20 minutes until the glue is completely dry.
Frequent errors in disassembly
Beginners often make mistakes that lead to costly repairs, most common being trying to open the phone without heating, guaranteed to deform the metal frame.
Another mistake is losing screws of different lengths. Redmi 3 uses screws of different sizes, and if you screw a long screw into a short hole, you can punch the case or damage the board.
- 🚫 Ignoring battery shutdown before working with plumes.
- 🚫 Use of excessive force in unscrewing of boiling screws.
- 🚫 Forgetting about the antenna cable, which can be easily squeezed when assembled.
Be careful of the details and your Xiaomi Redmi 3 will last a long time after a successful repair.