Disassembly Xiaomi Redmi Note 4: step-by-step guide with photos and tips

Xiaomi Redmi Note 4

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Many users have to disassemble the Redmi Note 4 to replace the battery, clean the connectors or repair the screen, but even with tools, the process requires care: for example, the twisted screws on the motherboard can damage tracks, and the wrong disconnection of the display plume can disable the touchscreen, and we will take a detailed look at each step, from the preparation of the workplace to the assembly, taking into account the specifics of this model.

Warning: disassembling the smartphone will void the Xiaomi warranty if it is still valid, and remember that lithium-ion batteries when disassembled are dangerous – they can not be pierced, bent or subjected to high temperatures.

Preparation for disassembly: tools and security measures

Before you start disassembling the Redmi Note 4, make sure you have all the tools you need, and using inappropriate screwdrivers or plastic blades can cause chips on the body or damage to the plumes.

• ✅ Plastic mediators (2-3 (a) - for separation of the back cover without scratches.
• ✅ The screwdriver. PH00 — motherboard-screw.
• ✅ Suction (optional) - helps to lid after heating.
• ✅ Hair dryer or thermo-air station - for softening the glue (temperature not higher than 60)°C!).
• ✅ Tweezers – for working with small details, for example, plumes.
• ✅ Isopropyl alcohol - for cleaning contacts and removing glue residues.

Also, prepare the workspace: it should be well lit, without dust and static electricity; It is advisable to use an antistatic mat or at least an earthed surface to avoid damage to components by static discharge; do not disassemble the phone on the carpet or couch - small screws are easy to lose in the pile.

⚠️ Note: If the Redmi Note 4 battery is swelling, it is better to trust the dismantling to professionals!

Before starting work, be sure to turn off the phone and remove it. SIM-If the battery is fixed (as in most cases), wait until the charge drops to the bottom. 20-30% — This will reduce the risk of short circuits in case of accidental closure of contacts.

Removal of the back cover: technique and typical errors

The Redmi Note 4's back cover is attached to the latches and glue, so removing it is the most critical step. The main mistake of the beginners is trying to plug the lid on the side without first heating, which leads to cracks or chips of plastic.

1. Heat the edges of the cover with a hair dryer (hold at a distance of 10-15 cm, temperature - up to 60 ° C) for 2-3 minutes. This will soften the glue.
2. Put a plastic mediator in the gap between the lid and the body at the charging connector, carefully guide it along the perimeter, alternately snapping the latches.
3. If the lid doesn't lend itself, reheat the problem area.

Pay special attention to the area near the fingerprint scanner, where there is a thin plume that is easily damaged. If the lid is removed but the plume is stuck to it, carefully disconnect it with tweezers, tweezing it from the side.

⚠️ Warning: If you see signs of corrosion or oxidation on the battery contacts after removing the lid, do not turn the phone on until they are cleaned.

Heat the edges with a hairdryer (60°C)| Use a plastic mediator |Do not force the fingerprint scanner | Check the integrity of the plumes after removal-->

Removing the battery: why not rush

The battery in Redmi Note 4 is glued to the body with double-sided tape, and its contacts are protected by black insulation tape. Many users try to pull the battery out by force without removing the glue, which leads to a rupture of the shell and leaking electrolyte.

1. Unplug the insulation tape from the battery contacts with tweezers.
2. Disconnect the battery connector from the motherboard with a plastic spatula (not metal!).
3. Put the battery on the side with a plastic mediator and slowly pull it up, and if it doesn't lend itself, put a thin plastic card (like a bank card) under it and carefully cut the glue as you move the card back and forth.

If the battery is blown up, don't try to remove it yourself, go to the service center, the bloated battery can ignite when mechanically exposed, and don't use metal tools to make contacts, which can short circuit.

Once the battery is removed, check it for damage, and if there is swelling, electrolyte or deformation on the body, the battery must be disposed of and replaced with a new one.

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If the battery glue is left on the case, remove it with isopropyl alcohol or a special electronics cleaner. Do not use acetone - it can damage the plastic!

Disconnection of plumes and removal of motherboard

Once you take off the battery, you get access to the motherboard and the plumes. In the Redmi Note 4, the most vulnerable are:

• 🔌 Display plume (thin, easily torn with careless extraction).
• 📱 The fingerprint scanner plume (attached to the cover, often remains on it).
• 🔊 The plume of the speaker and microphone (can oxidize over time).

Procedure:

1. Unscrew all the screws on the motherboard (there are 12-14 pieces, of different lengths - remember the location of each!) Use a magnetic organizer or tape to avoid confusing the screws when you build.
2. Carefully unplug all the plumes with a plastic blade.
3. Lift the motherboard from the edge where there are no connectors, and remove it.

Note the heat paste on the processor — if it's dry, it needs to be replaced when you build it. Also check the charging connector contacts for oxidation, which is a common cause of charging problems in the Redmi Note 4.

⚠️ Warning: If the screen stops working after the display plume is disconnected, check the integrity of the flexible cable!

Disassembly of the front panel: screen and buttons

If you need to replace the display or touchscreen, you have to disassemble the front panel. In the Redmi Note 4, the screen is glued to the frame, so removing it requires special care.

1. Heat the screen with a hair dryer (temperature - 50-60 ° C) for 3-5 minutes, evenly watering the entire surface.
2. Put a plastic pickup on the screen from any angle, and if it doesn't respond, reheat the problem area.
3. After separation of the screen carefully disconnect the plume of the touchscreen and display from the motherboard.

The Volume and Power buttons are mounted on the latches, and to remove them, you just need to stick a plastic blade on the side, and notice that the buttons often accumulate dust that can be removed with compressed air or a soft brush.

If you are replacing the screen, make sure the new module is compatible with your version of the Redmi Note 4 (for example, only the original 1920×1080 display will work for the mido model).

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When changing the screen, always check the touchscreen before final assembly!If after connecting the new display, part of the screen does not respond to touch, the problem may be in the plume or motherboard.

Diagnosis and cleaning of components

After a complete disassembly of the Redmi Note 4, it is recommended to diagnose the key components:

• 🔋 Battery: check the voltage with a multimeter (normal - 3.7-4.2 V). If it is below 3.5 V, the battery needs to be replaced.
• 📶 Antenna contacts: clean them with alcohol if you notice problems with the network signal.
• 🔊 Speaker and microphone: blow with compressed air to remove dust.
• 🌡️ Thermopaste: If it is dry, replace it with a new one (e.g. Arctic). MX-4).

Pay special attention to the charging connector — in the Redmi Note 4, it is often contaminated or oxidized, leading to poor contact. Use wood toothpicks and alcohol to clean. Do not use metal objects!

If the phone was not turned on before disassembly, check:

• Integrity of the power plume (goes from the power button to the motherboard).
• The presence of a short circuit on the board (you can check with a multimeter in the "vertebrae" mode).
• The state of the capacitors near the processor - bloated or blackened parts indicate overheating.

Phone Assembly: How to Avoid Mistakes

The Redmi Note 4 should be assembled in reverse order, but with a few nuances in mind:

1. Make sure that all the plumes are connected before the battery is laid – after installing it, access to the connectors will be difficult.
2. Twisting the screws cross-cross to avoid skewing the motherboard.
3. Before installing the back cover, check the operation of all buttons and sensors (for example, the proximity sensor).

When installing the battery, use a new two-way tape (you can buy it from electronics stores). Don't skimp on glue - a poorly fixed battery can shift and damage the plumes.

After assembly, turn on the phone and check:

• 📶 Network operation (SIM-maps, Wi-Fi, Bluetooth).
• 🔋 Charging (plug the charger and make sure the current is going on).
• 🎤 Microphone and speakers (record voice note).
• 📷 Cameras (front and main).

⚠️ Attention: If after assembly the phone does not turn on, but when connected to charging shows the battery icon, the problem may be a faulty battery or poor contact of the power plume.

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After assembly, let the phone run for 10-15 minutes in normal mode, then turn it off and check the body temperature. If it heats up strongly in the processor area, it may be the thermopast is applied incorrectly or the screws of the board are pulled over.

FAQ: Frequent questions about the dismantling of Xiaomi Redmi Note 4