How to disassemble Xiaomi Redmi 3: a repair manual

Smartphones Redmi 3 series from Xiaomi deservedly gained a reputation for "unkillable" budgetary, but even the most reliable technology over time requires intervention. Most often users are faced with the need to replace a failed battery, broken display module or speaker. Self-disassembly device saves a significant amount of money on the services of the service center, if you perform all the actions carefully and consistently.

Before you start dismantling, it's important to understand that the design of this machine has its own peculiarities, in particular, the location of the plumes and the way the back cover is attached. Improper handling of fragile components can damage the motherboard or rupture the plumes, which will make repair impossible. So prepare the workplace, provide good lighting and assemble the necessary set of tools.

In this article, we will take a closer look at the process of fully disassembling a smartphone, paying special attention to hidden screws and the subtle nuances of disconnecting connectors. You will learn how to safely remove the back panel without damaging it, and how to properly remove the battery, which in this model is glued firmly enough.

Tools and workplace preparation required

The quality disassembly of any electronics begins with preparation. You do not need professional expensive equipment, but a set of specialized tools is mandatory. The main tool will be a set of screwdrivers, including cross bits of the size of the PH000 and PH00, since screws in Xiaomi are usually small and require an exact size of the sting.

A plastic blade or mediator is essential for opening the case and working with plastic latches. Metal objects such as a knife or a stitch are highly undesirable, as they can damage the case or, worse, close contacts on the board, and you will need a suction cup to gently lift the back cover.

• 🔧 Precision screwdriver kit (cross-hatch) PH000, PH00)
• 🛠 Plastic shoulder blade (poodger) or mediator
• 💨 Suction cup
• 🔥 Dryer or thermophene (to heat battery glue)
• 🧲 Magnetic mat or screw sorting container

Before you start, be sure to turn off your smartphone. If the device doesn't respond to buttons, wait for the battery to run out, although in the case of Redmi 3, this is rare. Prepare the screw tank in advance, as they can differ in length and threading, and confuse them when you build it - you risk the integrity of the case.

Removal of the back cover and removal of the main battery

The first step in dismantling the Xiaomi Redmi 3 is to remove the back cover. Unlike many modern smartphones, here it is removable, but it is held on powerful plastic latches around the perimeter and two screws under plugs. Find two small oval holes in the bottom end, closed with rubber plugs.

Carefully remove the plugs and unscrew the two visible screws, then you can move to the lid snapping, insert the plastic blade at the junction between the frame and the lid in the area of the charging socket and run it along the side faces, and a characteristic click will signal the release of the latch.

⚠️ Warning: Do not try to pull the lid around the camera or speakers, there are plumes that can easily be damaged if you carelessly jerk.

Once the lid is removed, you'll have access to the battery. In the Redmi 3, it has a 4100 mAh capacity and is glued to the frame on a double-sided tape. For safe extraction, it's recommended to warm up the back of the smartphone with a hairdryer for 1-2 minutes to a temperature of 60-70 degrees. This will soften the glue.

Use a plastic card or a spatula to tamper with the battery. Act slowly, don't put too much effort into bending or damaging the cell. If the battery is inflated, be especially careful not to puncture the shell.

Disassembly of the internal part: disconnection of plumes

The next critical step is to disconnect the plumes from the motherboard, and once you remove the battery, you'll see a metal screen covering the main connectors, and it's attached with a few screws that you need to unscrew. Be careful, the screws can be of different lengths, remember their location.

Under the metal plate are the plumes of the display, touchscreen and main camera module. Use a plastic blade or nail to turn them off, putting the connector strictly from the bottom up or bending it to the side, depending on the type of connector. Metal tools are prohibited here, because there is a high risk of short circuit or mechanical damage to the contacts.

Also at this point, you need to disconnect the bottom board plume (with the charging connector) and the side button plume. These often pass under the main elements, and ignoring them can cause a break when you try to remove the board.

Extraction of motherboard and components

Once all communications are shut down, you can start removing the motherboard, which is held by perimeter screws and, in some modifications, additional mounts in the area of the camera lens. Unscrew all the visible screws.

Carefully raise the board to check if any plume is caught. Often users forget to turn off antenna contacts or volume key plume, which leads to jerk and damage. The board is better removed from the side of the charging connector, slightly lifting it.

On the back of the board are the main speaker and the vibrator, and if you want to replace these elements, you can remove them without removing the board completely, but for a complete disassembly, you better free up space. The vibromotor is usually just inserted into the groove, and the speaker can be glued.

Replacement of the display module and touch screen

Replacing the screen with Redmi 3 is one of the most difficult operations, because the matrix is tightly glued to a metal frame. If you have only a glass (touchscreen) or a module assembled without a frame, the process will take a long time. It is easier and more reliable to purchase a module with a frame, just to move the internals from the old device.

If you change only a glass or a module without a frame, you need to unplug the old screen. To do this, heat the front of the phone with a hairdryer. Be careful: overheating can damage the body. LCD-It's a matrix or it's a yellow spot, and the optimum temperature is about 80 degrees.

⚠️ Warning: Avoid putting too much pressure on the center of the matrix when working with the screen, which can cause permanent damage to the crystals and black spots or stripes.

Use a thin line or a special knife to split the screen, passing it between the frame and the display. The movements should be sawing, without jerking. After removing the old module, carefully clean the frame of the glue residue with alcohol or a special solvent (B-7000).

Install the new module, making sure that the cables freely pass into the designated channels. Connect the plumes to the board (pre-setting the fee in the case for inspection) and check the touchscreen and images before final gluing.

Device assembly and function testing

The assembly is done in reverse order. Set the motherboard, making sure it's flat and no elements protrude outside the landing area. Twisting the screws, but don't pull them over so you don't break the thread in the plastic racks.

Connect all the plumes: display, touchscreen, cameras, buttons and lower boards. Set a metal plate and twist its screws. Insert the battery, making sure that its connector is tightly seated in the connector.

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Before you finally install the back cover, turn on your phone and check the microphone, speaker, vibrations and touchscreen, which will save time if some plume is not fully connected.

Close the back cover, pressing the perimeter until you click the characteristic clicks, screw the two bottom screws and plug them in, turn the device on and do a full test of all the features.

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Quality assembly depends not only on the actions, but also on the purity of contacts and the absence of dust inside the case, so carry out work in a clean room.

Frequently Asked Questions (FAQ)