How to remove the lid from the phone Xiaomi Redmi 9T

The process of dismantling the back of the Xiaomi Redmi 9T smartphone is the first and critical step when replacing the battery, screen or motherboard after moisture.The model is made in the form factor "monoblock", where the back cover is glued to the frame around the perimeter, which requires accuracy and the presence of a specialized tool. Mistakes at this stage can lead to glass chips, damage to plumes or deformation of the case, so it is important to strictly follow the proven method.

Many users mistakenly believe that it is enough to just tamper with a nail or a thin knife, but the design of the Redmi 9T involves the use of adhesive composition of high adhesion. The adhesive in this model is distributed unevenly: the main points of fixation are in the corners and along the long sides where the antenna modules are located, ignoring this fact often causes plastic latches to break or cracks on the glass.

Before any manipulations are initiated, make sure that the device is completely turned off and the battery is not more than 25% discharged, although the best option is to discharge up to 5-10% to minimize the risk of fire in case of accidental damage. In this article, we will discuss in detail all the preparation steps, the necessary tools and the process of removing the lid, paying special attention to the safety of components and maintaining leakage (as far as possible after opening).

Tools and workplace preparation required

To work with the Xiaomi Redmi 9T, you will need a minimal but specific set of tools that will avoid scratches and mechanical damage. Use of improvised tools such as kitchen knives or pins is strongly discouraged, as they can slip and damage the internal components.

First of all, get a heater. This can be a professional thermal separator, a regular hair dryer or, in extreme cases, a heating heater. The heating temperature should not exceed 80-90 degrees Celsius so as not to damage the display or battery, you also need a mediator to open (plastic blade), a suction cup to carefully pull the lid and tweezers with thin tips.

Prepare the workspace: the surface should be clean, flat and well lit. It is recommended to use an antistatic mat or just a clean sheet of white paper, which clearly shows small screws. Prepare containers for sorting fasteners in advance, as screws in the Redmi 9T can have different lengths and threads.

⚠️ Note: Before starting the heating, be sure to remove SIM-Not only will this make it easier to get air out when you expand, but it will also prevent accidental damage to the tray mechanism when you press the body.

The procedure for heating and softening glue

Heating is a key step in the success of the whole operation. The adhesive composition used in Xiaomi becomes elastic at a temperature of about 70-80 ° C. If the case is underheated, the lid will be removed with force and can crack; if it is overheated, you can damage the display matrix or cause the battery to bloat.

Using a hair dryer, warm the perimeter of the device evenly, paying special attention to the angles. Keep the hair dryer at a distance of 3-5 cm from the surface and constantly move it, without lingering long at one point. The heating process usually takes from 2 to 4 minutes, depending on the power of the device and the initial temperature in the room.

An alternative method is to use a heating pad. Put the phone back cover down on a preheated heating pad (temperature around 80°C) and leave for 5-7 minutes. This method is safer for the display, since the heat is applied evenly and there is no risk of local overheating from the air jet.

Technique of neat compartment of the back panel

Once the glue has softened, you need to create an initial gap between the lid and the frame. Attach the suction cup at the bottom of the back panel, closer to the center, but not at the edge, so as not to damage the glass. Suck the suction cup up slightly, creating tension, and insert a thin metal blade or a special knife into the resulting microscopic gap.

Once the blade has entered 1-2 mm, replace it with a plastic mediator. Plastic is preferred over metal at this stage, as it does not scratch the inner surfaces and is less dangerous to the plumes. Move the mediator along the perimeter, making movements from side to side, gradually cutting through the adhesive layer.

• 🔹 Start the movement of the mediator from the lower end, smoothly moving to the side faces.
• 🔹 Move the tool parallel to the plane of the screen, without going deeper into the body more than on the 2-3 mm.
• 🔹 Pay special attention to the corners - there the glue often remains the hardest, reheating is required.
• 🔹 Don’t try to open the lid like a book at once – walk around the perimeter first.

When you separate, you can hear the characteristic crackling of the glue, which is normal. But if the resistance is too high, don't use force. You better stop, heat the problem area with a hairdryer again for 30-40 seconds and continue. A sharp jerk can cause the Redmi 9T lid to burst.

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If there is no suction cup on hand, you can use a piece of scotch rolled into a loop with a sticky side outward, but this method is less effective on matte surfaces.

Working with internal components and plumes

When the adhesive layer around the perimeter is overcome, do not rush to sharply fold the cover. In the Xiaomi Redmi 9T model, the rear panel can be connected to the main board with a thin plume of the fingerprint scanner (if it is built into the switch on the side face, there is no plume on the cover, but in some versions or if there are other sensors, connections are possible). In this model, the scanner is located in the on-button, which simplifies the task, but caution still does not interfere.

Carefully lift the lid a few millimeters and visually inspect the interior space. Make sure nothing stretches from the lid to the body. If you plan to replace the lid completely, the old glue from the frame must be removed. Use a plastic card or tweezers to gently scrape off the remnants of the mass.

Cleaning the frame is an important step for subsequent sealing, using isopropyl alcohol and a lilac-free wipe to degrease the surface. The new glue will lie flat on the low-fat surface and ensure reliable fixation. Do not use superglue or Moment glue, as their vapors can settle on cameras and speakers, and then remove them will be impossible.

Typical errors and precautions

The statistics of service centers show that most damages in self-disassembly are due to rush and neglect of safety measures. The most common mistake is to try to remove the lid "cold" or not warm enough, in which case the Redmi 9T glass bursts with a characteristic sound, and the purchase of a new rear panel becomes inevitable.

Another common problem is the use of metal tools to pick around the perimeter. Metal slips easily and can cut the antenna plume or damage the side buttons. In addition, a metal object can close contacts on the board if it accidentally touches them under voltage (although the phone must be turned off, the residual current in the capacitors can be dangerous to sensitive electronics).

⚠️ Warning: Never insert any tools deeper 3-4 At this depth are critical plumes and power controls, the damage of which will lead to expensive repairs.

Also worth mentioning is the risk of battery damage: Lithium polymer batteries are sensitive to puncture and severe bending. If the lid is not neatly bending or the tool is pressed inward, you can damage the battery shell, which is fraught with inflammation. If you notice the battery bloating during the disassembly process, immediately stop work and dispose of the battery according to safety rules.

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The secret to success is patience, and it's better to heat the case 10 times than to pull and break the glass once.

Frequently Asked Questions (FAQ)