Modern Xiaomi, Redmi and POCO smartphones are equipped with batteries that cannot be removed without opening the case, which is dictated by the desire for thinness of devices and protection from moisture, but when the battery breaks or bloats, the user has to face the need for complex repairs. Self-disassembly of a smartphone requires not only technical skills, but also an understanding of the risks associated with lithium polymer batteries.
Incorrect actions can lead to damage to plumes, a rupture of the display or even a fire of the battery. Before you start to work, you need to carefully prepare and assess your strength. In this article, we will examine the dismantling process in detail, paying special attention to the nuances of working with adhesives and fragile components.
It should be noted that any attempt to open the device automatically voids the warranty obligations of the manufacturer. If your gadget is still in warranty service, it is wise to contact an authorized service center. However, if the warranty has already expired, and the desire to save or get a new experience is great, follow our recommendations.
Preparation of the workplace and necessary tools
The success of the surgery depends on 90 percent proper preparation, and you need not just a table, but a well-lit space where there is no air movement that can carry small screws, and the ideal solution is an antistatic mat, but without it, you can use a clean, dry surface without pile.
The toolkit should be specialized, ordinary stationery knives or rough screwdrivers can cause irreparable damage.
- 🔧 Precision screwdriver set (PH000, Pentalobe) for screwing of different calibers.
- 🔥 Thermal hair dryer or heating pad for softening the adhesive base under the screen.
- 💳 Plastic cards or mediators for gently snapping the body without scratches.
- 🧲 Magnetic mat or cell container for sorting fasteners.
Pay special attention to the heating element. Thermophen allows you to heat the perimeter of the device locally without affecting the internal components. The use of an open fire or a kitchen stove is strictly prohibited, as this will overheat and deform the plastic frames.
Don't forget to use isopropyl alcohol or a special adhesive solvent (B-7000 remover) to dissolve the adhesive residues, and prepare tweezers with curved ends to safely extract small parts from the depths of the case.
Primary diagnosis and precautions
Before you start any manipulation, make sure the device is turned off. Even if the screen is out, the smartphone can be in sleep mode, which can short circuit when the plumes are disconnected. Check the condition of the back cover: if it already has cracks, the risk of damage to the display when heated increases significantly.
⚠️ Attention: If the battery is swelling and pressing on the screen or back panel, you can not heat the device! This can lead to a breakdown of the shell and ignition of the electrolyte.
Take it down. SIM-A memory tray and a memory card tray, if it is designed by your Xiaomi model, is a must-see step that is often overlooked by beginners. A forgotten tray can block the opening of the case or break inside when sloppy movement.
Take a picture of each stage of disassembly. The camera of the smartphone will help to capture the location of screws of different lengths and the path of the plumes. In modern models, the screws can differ in length by only 0.5 mm, but their torsion can break through the motherboard.
The process of heating and removing the back cover
Modern Xiaomi smartphones are glued around the perimeter with a special adhesive. To soften it, you need to evenly warm the edges of the device. 80-90 degrees Celsius, otherwise you can damage OLED-matrix or melt plastic frame elements.
Use a hair dryer by warming the perimeter for 2-3 minutes. Keep the tool 3-5 cm from the surface, constantly moving it to avoid local overheating. Periodically check the softness of the glue by slightly pressing the sucker or trying to insert a plastic card into the gap.
- 🔥 Warm up the upper and lower edges, paying special attention to the corners where the glue is usually more.
- 🔪 Carefully insert the mediator or the blade of the safety knife into the joint between the screen and the frame.
- ✂️ Move "right-left" widen the gap, gradually moving around the circle, without removing the tool completely.
When the perimeter is passed, don't try to abruptly remove the lid. Inside, there may be connections or plumes going to the camera modules or the fingerprint scanner if it's built into the on button on the side edge. Make sure the scanner is disconnected or has a sufficient range.
If the lid is glass, be careful, the glass becomes more brittle when heated, and the excessive pressure of the sucker can lead to its destruction, in such cases it is better to use a thin string or fishing line, carefully "sawing" the layer of glue.
Power outage and removal of protective strips
When you remove the back cover, you'll see the inside of the smartphone, and the first thing you need to do before any other components are disconnected is find the battery connector and disconnect it from the motherboard, and that will turn the device off and keep the electronics safe from surges.
Most of the internal components are covered with plastic or metal slats that are screwed, and these screws can be of different lengths and threads, and to twist them, use a precisely matched bat so that you don't rip off the hats.
| Type of screw | Location. | Tool. | Risk of error |
|---|---|---|---|
| Short black. | Fixing fees | PH000 | Breaking the thread in plastic |
| Long silvery | Body angles | PH00 | Motherboard breakdown |
| Micro-screws | Display plumes | P2/Pentalobe | Connector damage |
Take all the security screens off carefully, and underneath them are the connectors of the display, the touchscreen, the main and front cameras, and the button plumes. Don't pull the plumes themselves, they're very thin and they break easily. Use a plastic blade to snap the connectors.
⚠️ Warning: Never use metal tools (needles, tweezers) to turn off connectors on the board on.The metal can close contacts and disable the power controller instantly.
Removal of the battery and replacement of components
In Xiaomi smartphones, the battery is usually glued to the frame or back cover with double-sided tape. You can't just pull it out like that, because you can't deform the battery's soft body, which will lead to a short circuit. Use special plastic tapes or a thin line to extract it.
Strip the tape under the battery and make sawing movements from side to side, gradually moving inward. If you use a fishing line, wrap its ends around your fingers (use gloves) and carefully sawn over the glue layer. This method requires patience, but it is the safest.
Don't try to tamper with a screwdriver or a knife. A puncture in the battery shell causes an instant chemical reaction to release a caustic smoke and fire. If the battery sits very tight, you can drip some isopropyl alcohol under the edges and wait 5-10 minutes.
After removing the old battery, clear the seat of the old glue residue.The new battery should be installed on fresh bilateral tape.Before final assembly, be sure to check the voltage on the contacts of the new battery with a multimeter - it should be in the range of 3.7-4.2 V.
What to do if the new battery is not charged?
Assembly of the device and check of performance
The assembly is done in reverse order, but with one important feature: don't stick the back cover all at once. First, plug the battery, set all the safety bars and twist the screws, and then you can do the initial test.
Turn on the device and check the basic functions: touchscreen, display color on the display, camera, microphone and speakers. Make sure the smartphone sees SIM-If everything works correctly, we can proceed to final sealing.
- 🧹 Degrease the frame perimeter and caps with alcohol for better glue adhesion.
- 🧴 Apply a thin layer of special glue (B-7000) or stick a new adhesive frame.
- 🤏 Tightly press the lid and fix the device with stationery rubber bands or in a special press on the 30-60 minute.
Extended glue at the edges, remove with a dry wipe until completely dry. After assembly, allow the device to lie down for several hours before first switching on, so that the glue gains final strength.
☑️ Pre-incorporation checklist
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Use a magnetic mat with markup to spread the screws in the same order in which you twisted them.This will save time and prevent error with the length of the screws during assembly.
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The main key to successful disassembly is the lack of rush and the use of the right temperature to soften the glue, as well as the mandatory disconnection of the battery before working with other plumes.