Modern smartphones are becoming more difficult to maintain, and Xiaomi Redmi 9 Pro is no exception. Owners often face the need to replace the battery, screen or just deep cleaning from dust accumulated over the years. Self-disassembly device saves a significant amount of money on services service centers, but requires extreme caution and understanding of the internal architecture of the gadget.
Before you start working, you need to realize that opening the case automatically voids the official manufacturer's warranty. If your device is still in warranty service, it is better to refrain from self-manipulation and contact authorized specialists. Otherwise, having a basic set of tools and carefully following the algorithm of actions will help you successfully perform the repair.
The process of dismantling the Redmi 9 Pro has its own nuances related to the location of the plumes and the mounting of modules. Incorrect handling of components can lead to irreversible damage, so it is important to prepare a workplace with good lighting. In this article, we will look at each step in detail, from removing the back cover to turning off the motherboard.
⚠️ Attention! Before starting any work, be sure to completely turn off the smartphone. Attempting to disconnect the plume under voltage can lead to a short circuit and the controllers fail.
Tools and workplace preparation required
Good disassembly is impossible without the right tools. Use of improvised tools such as kitchen knives or pins is highly undesirable, as they are easy to damage plastic or hurt. To work with the Xiaomi Redmi 9 Pro, you will need a specialized kit that can be purchased in radio parts stores or online.
The main tool will be a set of precision screwdrivers, including cross bits of the size of PH00 and PH000, which are the screws that attach most internal components, and an indispensable assistant will be a mediator or a plastic blade to snap the latches of the case without damaging their geometry.
- 🔧 A set of precision screwdrivers with a magnetic tip for twisting screws of different caliber.
- 📱 Plastic blades and mediators for safe opening of the body and disconnection of plumes.
- 🌡️ Thermophen or heated suction cup to soften glue under the back cover.
- 🧲 Magnetic mat or organizer for sorting screws, so as not to confuse them when assembling.
Special attention should be paid to the organization of space. Small screws have the property of flying around the table and getting lost in the pile of the carpet. Using a magnetic mat or at least a sheet of paper with signed zones will help to maintain order. This is critical, because the length of the screws in different nodes of the smartphone can vary, and placing a long screw in a short hole can penetrate the motherboard.
⚠️ Attention! Do not use metal tools to tamper with plumes or snap plastic latches. Metal can damage insulation or cause a short circuit on the board.
Removal of the back cover and primary access
The Redmi 9 Pro's disassembly begins with the traditional removal of the rear panel. Unlike the older models, there is no removable cover, and the camera module itself does not protrude, which simplifies the process but requires heating the glue. The back cover is glued around the perimeter with a special composition that softens at a temperature of about 80-90 degrees Celsius.
To warm up, use a building dryer, evenly warming the perimeter of the device for 2-3 minutes. Do not keep the hot air flow at one point for too long so as not to damage the display or battery. After warming up, insert the suction cup into the bottom of the back panel and gently pull up, creating a gap for the plastic blade to enter.
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Warm the lid evenly on all sides. If you feel that the glue is holding the lid firmly in some place, it is better to add a little more heat than to apply force.
As you move the blade along the perimeter, you'll hear the characteristic crackling of the adhesive coming off. It's important not to insert the tool too deeply so as not to touch the internal plumes that run from the side buttons to the board. Once all the latches are snapped, the back cover will easily be removed, opening up the insides.
Immediately after removing the cover, you will see a protective plate. NFC-It's a module that also acts as a heat sink, and it's attached with multiple screws and tweezers, and it can be tweezed, and underneath it, you can have a fingerprint scanner plume if it's not integrated into the switch.
Dismantling of battery and power system
One of the most common reasons for disassembly is to replace the battery. In the Xiaomi Redmi 9 Pro, the battery occupies most of the interior space and is fixed with powerful adhesive strips. Before any action with the battery, you need to disconnect its plume from the motherboard.
To access the battery connector, you need to remove the metal protective plate covering the connectors, which is attached to several screws of different sizes, so it is important to remember their location. After removing the plate, carefully bend the battery plume upwards using a plastic blade or nail.
☑️ Safe operation with the battery
Removing the battery itself is a process that requires patience. The glue under the battery is very strong, and trying to pull it out by force can deform the body or, worse, damage the cell and fire. Use special hoods or a thin line to cut through the adhesive layer.
- 🔋 Carefully pull the sticker tongues if they have survived, trying not to break them.
- 🧵 If there are no tongues, slash a thin line or dental floss under the battery and saw from side to side.
- 🌡️ Slightly warm up the area under the battery (on the outside of the case) to soften the glue.
- 🚫 It is strictly forbidden to use metal objects for tampering with the battery.
The new battery should also be warmed up and degreased before installation for better adhesion. After connecting the new plume, do not rush to close the phone - first check if the device is charging and if the charge level is displayed correctly.
Replacement of the display and the touch screen module
Disassembling the front of the Redmi 9 Pro to replace the screen is the most risky operation. The display module is glued to the frame here, and its dismantling often requires the complete disassembly of the phone or the use of a separator. At home, the most common change of the screen along with the frame, which greatly simplifies the task.
If you buy a framed module, the process is to transfer all the internal components from the old case to the new one, first you need to disconnect the display and touchscreen plumes from the board, and they can be combined into one connector or separated, depending on the revision of the matrix.
| Component | Type of attachment | Risk of damage | Tool. |
|---|---|---|---|
| Display. | Clay + Schleife | High-pitched | Scapula, hairdryer |
| Battery | Sticky stripes. | Medium. | Leska, sucker. |
| Maternity fee | Screws + plumes | Medium. | Screwdriver, tweezers. |
| plumes | Latchers | High-pitched | Plastic. |
When you move the board, look at the speaker grid and the rubber seals, and they need to be carefully re-stitched to a new frame to keep the moisture protection (at least at a basic level) and sound quality. Touchscreen plume damage when tense is a common mistake for beginners, so work slowly.
⚠️ Attention! The display plumes are very thin and sensitive to clamps. Any sharp angle inflection can cause a stripe on the screen or a complete failure of the touch screen.
What if the screen doesn’t work after replacement?
Removal of motherboard and cameras
The motherboard in Xiaomi Redmi 9 Pro is located at the top of the case and is closed with a massive metal screen. To remove it, you need to disconnect all antenna cables, button plumes, speakers and cameras. Antenna wires often sit very tightly, and you need to pull them strictly upwards, swaying at the base.
The main camera module is usually made up of several blocks, and the main sensor is attached to a separate socket, and can be further fixed by a screw or frame. When removing the camera, it is important not to touch the lens with your fingers, since fatty traces are difficult to remove and they will affect the quality of the photo.
And if you spin all the screws around the board and remove the shielding plates, you can carefully remove the motherboard. Notice the location of the vibrator and the lower microphone, which are often hidden under the board or attached to the edge of the board. When you reverse assemble, make sure that all the connectors are snapped with a characteristic click.
- 📸 Carefully disconnect the main camera plume by pulling a special tongue.
- 🔊 Check the status of the contacts of the lower speaker before installing the board back.
- 📡 Place antenna wires in the original channels so as not to overwhelm them with the body.
- 🔍 Examine the board under the magnifying glass for microcracks or oxides after extraction.
The dust board should be cleaned with a soft antistatic brush, and the use of compressed air is permissible only at low pressure, so as not to rip off small ones. SMD-After cleaning, it is recommended to wipe the board with a lilac-free wipe slightly moistened with isopropyl alcohol.
Assembly of the device and verification of functionality
The Redmi 9 Pro is built in reverse order, but requires even more care. It is important to remember to put all the screws in their places, especially those that fix the board, as their absence can lead to poor contact or breakage when falling. First plug the battery, then check the on, and only then fix all the screws.
Pay special attention to the stacking of the plumes. They should lie flat, without any cracks or tension. If the plume is stretched, when the shell is closed, it can move away from the contact. Use the original guides and locks provided by the design.
Once you have the back cover installed, check all the functions: vibration, sound, microphone, Wi-Fi and Bluetooth. If the antenna cable is not connected correctly, the signal level may be low. Also, make sure that the volume and on buttons have a clear, elastic stroke.
The final step is to check the tightness (as much as possible at home) and appearance. Make sure there are no gaps between the screen and the frame, and the back cover sits tightly around the perimeter. If all the stages are completed successfully, your smartphone is ready for full operation again.
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The key to successful assembly is consistency and lack of rush. Every screw and plume has its place, and 90% of the time you pay attention to repairs.