Xiaomi’s Redmi Note series has a reputation for reliability, but even these are not immune to mechanical damage. One of the most common problems faced by owners of the Redmi Note 7 (codenamed lavender) is the failure of the power button, which can manifest itself in sticking, lack of tactile response or a complete plume break, making it impossible to turn on or lock the screen.
Recovery requires careful disassembly of the case and replacement of the module. The process of replacing the power button on this model is not trivial, since access to it is blocked by the battery and the motherboard. You have to perform a series of sequential actions that require concentration and the presence of a specialized tool. Wrong actions can lead to damage to the plumes or battery failure.
In this article, we will take a closer look at the process of dismantling old components and installing a new plume with a button. We will focus on the nuances of unsticking the battery and the correct positioning of the connectors. Safety and sequence of steps will allow you to bring your smartphone back to life without going to the service center.
Tools and workplace preparation required
Before starting work, it is important to prepare everything necessary to not interrupt the process at the most critical moment. To replace the button plume with the Redmi Note 7, you will need a specific toolkit that differs from the standard for many other models due to the design of the case.
The big challenge is that the battery in this model is glued to the body, and the button is underneath it.
- 🔧 A set of Phillips screwdrivers with bits (cross) of various sizes, in particular #00 and #000.
- 🔥 A dryer or heat pack (heater) to soften the glue under the battery.
- 🎣 Plastic cards or mediators for uncoupling elements.
- 🧲 Magnetic mat or organizer for sorting screws.
It is also recommended to use a suction cup to lift the back cover and a thin line or special string to safely extract the battery.Make sure the workspace is well lit and all the fine details are not lost on the carpet or table.
☑️ Preparation for repairs
Rear cover removal and battery removal
We start the disassembly with the removal of the rear glass panel. 7 It's attached to a two-part glue around the perimeter. SIM-So you don't damage it when you heat it up, then you gently heat the perimeter of the back cover with a hair dryer to a temperature around the temperature. 80-90 Do not hold the hair dryer too long in one point so that the glass does not burst.
Once warmed up, place a suction cup at the bottom of the back cover and pull up slightly to create a gap. Insert a plastic card into the resulting gap and, as you move back and forth, gradually cut the glue layer throughout the circuit. Be especially careful in the area of the camera module so that you don't touch the plumes.
The next step is to remove the battery. This is the most risky moment, because the lithium polymer battery is easily damaged by a sharp tool. Heat the battery area through the protective film or with the lid open (if the design allows) to 60-70 degrees. The glue will soften, and you can use a plastic card or fishing line to separate the battery from the housing.
⚠️ Note: It is strictly forbidden to use metal objects (knives, blades) to smack the battery.Puncture of the battery can cause instant fire or explosion of the battery.
Once the battery is removed, you need to unscrew the screws that lock the bottom plastic cover that covers the charging connector and the speaker. Usually there are several screws of different lengths, it is important to remember their location. Once you remove the lid, you will have access to the plume that connects the main board and the lower board to the button.
Access to the main board and disconnection of plumes
Replacing the power button is not enough to simply remove the bottom cover, as the plug connector of the button is located under the motherboard or requires its partial dismantling for safe access. In the Redmi Note 7, the power button plume passes under the battery and connects to the main board from above.
You're going to have to take off the metal screen that covers the motherboard connectors, unscrew all the visible screws around the perimeter of the board and in the center, carefully remove the metal plate using a suction cup or plastic tool, and underneath it you'll see the main connectors: the display, the cameras, the battery and the system plumes.
The first thing you need to do is disconnect the battery connector from the motherboard if you haven't already done so when you're removing the battery. Then disconnect the main plume from the lower board (with the power button and microphone) to the motherboard, which can be paired with the antenna wire or go separately depending on the board's revision.
Nuances of plumes
Now you can start removing the motherboard itself, gently slap it around the edges, trying not to damage the cameras, flip the board to access the underside, where the plug plug plug of the power button is often located.
Replacement of the switch plug
On the underside of the motherboard or on the bottom board of the smartphone (depending on the specific modification and path of the train), you need to find a connection. In the case of the Redmi Note 7, the button plume often goes from the bottom module (where the USB connector is) up to the motherboard.
If the button is part of a separate plume, suitable on the side or bottom: gently unclose the old plume from the frame using heating and a thin tool. disconnect its connector. Set a new plume, making sure it sits tightly in the connector. Lock it with a clamping bar if it is designed.
It's important to check the condition of the contact pads. If they have oxidation, they can be cleaned with alcohol. The new plume must be stacked smoothly, without any clamping or tension. Often the button is pasted into a frame, and replacing it requires complete glue re-adhesion or the use of B-7000 glue to fix the new part in place.
Put the structure back together: plug the plume into the motherboard, install the screens, screw the screws. It is recommended to conduct an initial health check before final assembly and battery gluing.
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Use the B-7000 or T-7000 glue to fix the new button in the seat, and apply the minimum amount of it so that the contacts do not fill up.
Compatibility table and details characteristics
When buying a spare part, it’s important to make sure it’s compatible with your smartphone version. Although the Redmi Note 7 has a single global platform, there are different component revisions.
| Parameter | Original detail | Analogue (Copy) | Units |
|---|---|---|---|
| Type of connection | The plume (FPC) | The plume (FPC) | - |
| Location. | Lower Fee/Frame | Lower Fee/Frame | - |
| Contact material | Golding | Nickelization | - |
| Pressing resource | ~100 000 | ~30 000 | cycle |
The use of original components guarantees a long service life and proper operation of the button mechanism. Cheap analogues can quickly lose tactile response or stop responding to presses after a couple of months of operation.
Smartphone assembly and initial launch
Once you have successfully installed a new button and checked the connections, you can start building the battery, put the battery in place, pre-applying a new double-sided tape or special glue for the batteries, connect the battery connector to the motherboard.
Put all the safety screens in place and screw the screws. Don't tighten them too much so you don't break the thread in the plastic bushings. Check if all the plumes on the display and touchscreen are connected securely, because they may have been affected during operation.
Before you stick the back cover, make sure you check the device's performance. Press the power button. The smartphone should vibrate and show the MI logo. If the screen catches fire and the phone responds to touch, you've done the job.
⚠️ Warning: If the phone doesn't turn on after assembly, don't rush to disassemble it again. 15-20 minutes, since in a deep discharge the indication may not appear immediately.
Once you're sure of working capacity, apply a new glue around the perimeter of the case and press the back cover. Lock the smartphone with rubber bands for 1-2 hours until the glue is completely dry.
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The main difficulty of replacing the button on the Redmi Note 7 is the need to remove the battery, which requires accuracy and heating of the case.
Possible problems and solutions
Even with careful follow-up, there may be unexpected situations, such as a new button that may not respond, in which case the connector's landing density should be checked, sometimes requiring the removal of protective film from the connector's contact pad that beginners forget about.
Another common problem is sticking the button because of the glue excess, so if you used too much of the fixing compound, it could get inside the mechanism, which would require re-disassembly and cleaning with alcohol.
It's also worth checking if the plume is clamped with a body or a screw.A sharp angle twist of the plume can cause tracks to break and signal loss.Make sure all cables are stacked in their guide channels.