Xiaomi Redmi 4X is one of the most reliable devices of its time, but even the most durable battery loses capacity over time. If your device stops holding charge or the screen is critically damaged, the only way out is to replace components on its own. However, the design of this gadget has its own features that must be considered before starting work, so as not to damage fragile plumes and plastic elements.
The main challenge that amateur craftsmen face is that the back cover is not just sitting on the latches, but is tightly glued around the perimeter. The wrong impact can lead to cracks in the glass or damage to the body, which will make further assembly impossible. In this article, we will discuss the dismantling process in detail, paying special attention to safe methods of heating and peeling.
Before you pick up the tools, it's important to understand that opening the case automatically voids the warranty if it's still valid. You also need to completely discharge the battery to the minimum to reduce the risk of short circuits if you accidentally damage the batteries. Preparing the workplace is the key to successful repairs, so make sure you have good lighting and a magnetic screw mat.
Tools and workplace preparation required
You can't disassemble the frames properly without specialized tools, and you can't use knives or sharp metal objects because they can damage the internal components or scratch the frame, and you'll need a minimal but effective set that allows you to do the surgery as cleanly as possible.
- 🔥 Hair dryer (construction or household) for softening glue.
- 🔪 Thin plastic card or special spatula for opening.
- 🔧 Set of screwdrivers (cross-haired) PH000 and Torx, if necessary).
- 💧 Fluid B-7000 or isopropyl alcohol to remove glue residues.
Special attention should be paid to the heating element. A normal hair dryer may not give enough temperature, so it is better to use a temperature-adjusted building hair dryer, setting the value no higher than 80-90 degrees. Overheating can deform plastic parts or damage the display matrix if you warm the front side for too long.
Organize the space so that all the screws fold in a certain order. Redmi 4X uses screws of different lengths, and if you confuse them when you build, you can punch the motherboard or damage the thread in the plastic case. Use a magnetic mat or just a piece of paper with signed zones for each stage of dismantling.
☑️ Preparation for disassembly
The process of heating and removing the back cover
The most important step is to separate the back panel from the frame, the adhesive composition used by the manufacturer is quite strong, but it is heat treatable. Don't rush to tear the lid off by force, as this is guaranteed to lead to its destruction.
Warm the perimeter of the device evenly for 2-3 minutes. Keep the hair dryer 3-5 cm from the surface, constantly moving it so as not to overheat one point. After heating, try to gently tamper with a plastic card. If the cover does not lend itself, continue heating as you walk along the edges.
⚠️ Warning: Do not insert a metal needle deep under the lid immediately after heating.The adhesive can only be softened from the outside and the internals are still fixed.A sharp movement can damage the fingerprint scanner plume if it's connected.
When you feel the glue has moved away, slowly map along the perimeter, gradually releasing the latches. Move from the corners to the center of the long sides. If the cover is made of metal (in some versions), it can be stiffer, but also more brittle at the kink, so avoid heavy pressure in the center.
Once you successfully remove the lid, you'll see a metal frame covering most of the components, and it's also attached to the screws that you need to unscrew before you access the battery. Be careful, because antenna cables often pass under this frame.
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If the back cover cracked when removed, do not throw it away. The fragments can be temporarily fixed with transparent tape so that they do not interfere with work, and after repair, replace with a new one or use a silicone case.
Dismantling of metal frame and access to battery
And underneath the back, there's a massive metal plate that acts as a radiator and a shield, and it's screwed with a lot of screws around the perimeter and in the center, and your job is to twist them all out without losing them or confusing them.
Use a magnetic-tipped screwdriver to safely remove the fastener.Some screws may be hidden under stickers or warranty seals that you have to break. After removing all screws, gently lift the frame, starting at the bottom edge where the speaker is usually located.
Inside, you'll see a battery that covers almost the entire body area, and a motherboard at the top. Notice the plumes that connect the main board to the sub-board (where the charging and microphone connectors are located), which can pass under metal clamping slats.
Before you take out the battery, you need to disconnect the display plume and touchscreen from the motherboard, and to do this, gently flick the metal pin of the connector and pull the plume upwards without bending it at a sharp angle, which is critically important, because the display plumes are very sensitive to the clamps.
Replacement of the battery and work with adhesive base
The battery in Xiaomi Redmi 4X is glued to the body on double-sided tape. Over time, it can dry dead, and attempts to pull it by the tongue often end in deformation of the battery itself, which is strictly forbidden.
If you don't have to pull the tongue, warm up the back of the device again with a hairdryer in the battery area, which will soften the glue, then use the plastic card to gently tuck the battery in as you move from the bottom edge to the top. Try not to prick the battery case with sharp objects.
| Parameter | Original | Quality copy | Cheap copy |
|---|---|---|---|
| Capacity | 4100mAh | 3800-4000 mAh | 2500-3000 mAh |
| Weight. | ~65g | ~60-64g | Less than 55g |
| Tension. | 3.85 In | 3.85 In | 3.7-3.8 Included |
| Controller | Protection against overheating | Basic protection | Often absent |
Once the old battery is removed, clear the seat of the old glue residue, ideal for this isopropyl alcohol or a special liquid to remove the glue, the surface must be clean and fat-free, so that the new battery lay flat and held securely.
A new battery is usually equipped with adhesive base. If it is not available, apply a thin layer of B-7000 glue to the edges of the seat or use double-sided tape. Do not apply glue to the center where the bloating is located (if the new battery has one in the design) or where the controller is located.
Assembly of the device and verification of functionality
The assembly is done in reverse order, but requires increased attention. First, plug the display plume in and check the image without fixing anything with the screws. If the screen is working, the touchscreen responds, and there is sound, you can continue.
Set a metal frame and twist all the screws. Make sure that no wires on the antenna are screwed or pinched. Then connect the battery plume to the motherboard. Only after the battery is plugged in can you try to turn the phone on.
⚠️ Warning: Before the final back cover sticker, be sure to check all sensors, vibrations and cameras. If you seal the lid and find a malfunction, the disassembly process will have to be repeated again, risking damage to the adhesive layer again.
Apply a new layer of glue around the perimeter of the back cover or use a ready-made glue circuit. Give the glue a little dried (1-2 minutes), then carefully align the cover with the body and press hard around the perimeter. For better fixation, you can use rubber bands to pull the phone together for 15-20 minutes.
The final test includes charging, speaker and microphone testing. Make sure the lid sits tight, without gaps or creaks. If all the steps are successful, your Xiaomi 4X is ready for full-fledged operation again.
What if the phone doesn’t turn on after assembly?
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Quality cleaning of the seat from old glue is a guarantee that the new battery will not hang inside the case and warm up.