Replace buttons on Xiaomi Redmi Note 8 Pro

Xiaomi Redmi Note 8 Pro has proven to be a reliable device, but over time, mechanical controls can wear out. If the buttons stop responding, crash or stick, this makes it significantly difficult to use the gadget. In such cases, qualified replacement of components is required, which can be performed independently with the skills and tools.

Key restoration is a process that requires care, as the inside of the case contains fragile plumes and a glass back cover. Incorrect actions can damage the display or battery. Accurate diagnosis before work can help avoid unnecessary costs and determine whether a complete replacement or a sufficient cleaning of the contacts is necessary.

In this article, we will discuss in detail all the steps of the procedure, from the preparation of the workplace to the final assembly. You will learn how to choose a quality plume of buttons, what nuances exist when working with the adhesive layer and how to check the result without risk to electronics.

Diagnosis of malfunction and selection of components

Before disassembling the case, you need to make sure that the problem lies in the mechanical part. Often users confuse a software failure with a hardware breakdown. Check whether the lock mode or the "pocket mode" is activated, which can block the reaction to pressing. If there is no reaction even after rebooting, physical intervention is most likely required.

The keys are the microswitched plume. There are original modules and quality analogues in the parts market. When choosing, look for metal domes under the buttons, which provide a clear tactile response. Cheap copies often have too tight or flaccid buttons, which worsens the experience.

It's also worth checking the connector on the motherboard, and contact oxidation can cause periodic failures, and if you notice any signs of corrosion or moisture, you'll need not just a replacement, but also an ultrasound or alcohol cleaning, and in some cases, soldering of the connector helps, but it requires professional equipment.

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Try to run your smartphone in safe mode before disassembling. If the buttons work, the problem is in a third-party application, not in hardware.

The quality of a new part directly affects the durability of the repair. Don't skimp on this component, as replacement will require re-disassembly, which increases the risk of damage to the display or rear window the next opening.

Tools and workplace preparation required

Successful replacement will require a specialized toolkit, the absence of even one element can damage the fasteners or the housing, the workplace must be well lit, and the surface must be clean and antistatic.

• 🔧 A set of screwdrivers with Phillips and Pentalobe bits for twisting screws of different caliber.
• 🔥 Thermolenta or hair dryer for softening the adhesive layer under the back cover.
• 💳 Plastic card or mediator for neat opening of the case without scratches.
• 🔍 Tweezers with curved ends for working with small plumes.
• 🧴 Isopropyl alcohol for degreasing surfaces before gluing.

Pay special attention to the heating of the back cover. The Redmi Note 8 Pro glass is sensitive to temperature changes. Excessive heating can lead to cracks, so control the surface temperature with your hand - it should not burn. The optimal softening temperature of the adhesive is about 70-80 degrees Celsius.

Prepare a screw tank. You'd better use a magnetic mat or a cell organizer, where you'll fold the fastener in order to dismantle it, and that will make it easier to assemble and prevent the loss of small parts that can easily roll under furniture.

The process of disassembling the smartphone

Start disassembling only after the device is completely turned off. SIM-cards to access one of the hidden screws, if it is designed by your board revision.In the Note 8 Pro, the main screws are located around the perimeter of the lower edge and under the stickers.

Heat the perimeter of the back cover evenly. Move the hair dryer around, avoiding the concentration of heat at one point. After warming, insert the suction cup into the bottom of the lid, pull up slightly, and enter a thin mediator into the gap. Driving the tool along the edges, gradually cutting the adhesive layer.

⚠️ Warning: Don't try to cover the side faces where the antenna inserts are located. There's a thicker adhesive layer, and there's a high risk of breaking glass or damaging the plastic inserts of the antennas.

When you take the lid off, you'll see the battery covered with a safety film with the words, and to access the button plumes, you have to remove the bottom plastic bar, and it's secured with several screws that you need to unscrew. Be careful, there are plumes of the display and touch screen underneath the bar.

Disconnect the main battery plume from the motherboard, which is a critical step to shutting down the device, and then you can safely turn off other plumes, including the one that connects the buttons to the board.

Replacement of button plume and assembly

The button plume in Xiaomi Redmi Note 8 Pro

Install the new part, making sure it's flat and not clamped. Connect the plume to the characteristic click. Before the final assembly, it is recommended to conduct an initial check. Connect the battery and try to turn the device on by holding the power button.

If the phone is on and the buttons are responding correctly, you can proceed to the final assembly. Apply a new layer of glue (B-7000 or special adhesive) to the frame of the case. Let the glue dry slightly for 1-2 minutes, then tightly press the back cover and lock the device with rubber bands for 15-20 minutes.

Typical errors in repairs

One of the most common mistakes is to ignore battery shutdowns, and trying to disconnect the powered button plume can cause the power controller on the motherboard to burn, making repairs economically inefficient.

Another problem is the use of inappropriate glue: Superglue (cyanacrylate) releases fumes that settle on camera lenses and speakers, causing white plaque that is virtually impossible to remove. Use only specialized adhesives for electronics.

Often, beginners damage the plume itself when installed, it's very thin and delicate. Mechanical stress can lead to micro-cracks in the tracks that will manifest after a while. Lay the plume strictly along the factory guides without stretching it.

Don't forget the screws are of different lengths. Wrap a long screw into a short hole can break through the body or damage the internal components. Always check the disassembly scheme or remember the location of the fastener.

Checking and calibration

Once built, you need to test all the features, check not only on, but also volume control, lock the screen, you can run a button test in the engineering menu, and then dial ##6484# in the phone app.

In CIT (Customer Inspection Test) mode, select the button (usually Key or Button) and press the keys and monitor the reaction on the screen. Values should change clearly, without double taps or omissions.

If the buttons are working but they're too tight, maybe the frame was skewed or the train was incorrectly stacked, and then you have to reopen the device and correct the positioning, and tightening the screws on the lower bar also affects the stiffness of the buttons.

⚠️ Warning: If the power button is running after the replacement but does not vibrate when the power button is clamped for a long time (vibro response), check if the vibrate motor is connected. In some models, the button plume and the vibrate motor are combined or located next to each other.

Questions and Answers (FAQ)

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The main challenge of replacing the glass back is to remove the glass cover neatly without damage, and use high-quality heating and thin tools.