Xiaomi Redmi Note 4 is one of the most popular smartphones in the budget segment, released in 2017. Despite the years since, the device is still in active use, which means that the issue of repair and disassembly remains relevant. Disassembly of the phone may be necessary to replace the battery, repair the display, clean the connectors or diagnose malfunctions.
In this article, we will take a closer look at the Redmi Note 4’s mido disassembly process, taking into account all the technical features of the design, what tools will be required, how to safely remove the back cover, remove the battery, and get to the motherboard, and pay special attention to the typical mistakes that beginners make, and give recommendations for preventing damage.
If you've never taken a smartphone apart before, don't rush to work without getting ready. The Xiaomi Redmi Note 4 design involves the use of glue and latches, and improper application of force can lead to cracks in the plastic case or the break of flexible plumes. Before you start, read the full instructions and prepare the workplace.
Preparation for disassembly: tools and precautions
Before you disassemble the Xiaomi Redmi Note 4, you need to prepare tools and ensure a safe environment for work, and the absence of at least one of the key tools can complicate the process or lead to damage.
Here is the minimum set you will need:
- 🔧 Plastic mediators or shoulder blades (2-3 (a) - to separate the body without scratching.
- 🔨 The screwdriver. PH00 — motherboard-screw.
- 🔋 Screen suction cup – will help remove the back cover if the glue is too strong.
- 🧲 Magnetic mat or organizer – so as not to lose small screws.
- 🔥 Hair dryer or thermoair station - for softening the glue (optional, but recommended).
- 🧴 Isopropyl alcohol (90%+) — Cleaning contacts and removing glue residues.
Also, prepare the workplace: the desk should be clean, well-lit and without static electricity, it is advisable to use an antistatic bracelet or at least periodically touch a grounded metal object to avoid damage to the electronics by discharge.
⚠️ Note: If you are disassembling a phone with a discharged battery (<15%), Put him on a charger on 10–15 Disassembly of a device with a fully discharged battery can lead to short circuits when contacts are accidentally closed.
If you are planning to replace the battery, buy an original or certified battery with a capacity of 4100 mAh (article MB39> for the version with a Snapdragon 625). For the version on the Helio X20, the battery with an MB38 item will suit.
Removing the back cover: combating glue and latches
The most critical step is to remove the back cover, and in Redmi Note 4, it's attached to a two-part glue and plastic latches around the perimeter, and if you act rudely, the lid can crack or bend. Let's take a Step-by-step.
- Turn off the phone and remove the tray for SIM-cards by means of a paper clip or special key.
- Plug a protective film (such as scotch) on the screen so as not to scratch it with the mediator.
- Heat the back cover with a hair dryer for 1-2 minutes, keeping it at a distance of 10-15 cm The temperature should be 50-60 ° C - do not overheat so as not to damage the plastic!
- Insert a plastic mediator into the gap between the lid and the body (start at the bottom edge, next to the microUSB connector). Carefully drive the mediator along the perimeter, disengaging the latches.
If the lid doesn't lend itself, don't use too much force. Try to heat the problem area again, or use a screen suction cup to evenly pull the lid upwards. At the very least, you can use a thin guitar mediator, but be very careful.
Check if the phone is turned off.|Make sure that SIM-tart removed|Plug the protective film on the screen.|Prepare the hair dryer and the mediators|Place your phone on a soft surface-->
When you take the lid off, you'll see the battery, the motherboard, and some plumes. Don't pull the plumes! They're fragile and easily torn. If the lid is barely removed, check for cracks, which sometimes appear near antenna mounts.
⚠️ Warning: Some versions of the Redmi Note 4 may have an extra battery-operated protective film under the lid. Don't remove it until the battery is removed, it prevents short circuits! The battery in Xiaomi Redmi Note 4 is glued to the body, and its removal requires caution. Under no circumstances, do not throw the battery with sharp objects! This can lead to puncture and fire. Here is how to do it safely: Unplug the protective film (if any) and examine the battery, it should be marked with a 4100 mAh and an article. Push the battery with a plastic blade on the side (not on the motherboard side!) If it does not respond, carefully pull the special tongue (if any). If the glue is too strong, drop a few drops of isopropyl alcohol under the battery and wait 1-2 minutes. The alcohol will dissolve the glue without damaging the electronics. After extraction, inspect the battery for bloating. If it is deformed, don't reuse it, it's dangerous! When you install a new battery, clean the contacts on the motherboard with alcohol and remove the residue of the old glue. The new battery should fit tightly to the body, but not deform. For fixation, you can use double-sided tape or special glue for the batteries. 💡If the battery is swelling but the phone is still working, don't charge it or leave it unattended. A bloated battery can ignite when heated or mechanically exposed. Symptoms Possible cause Phone not turned on but vibrates when charging Battery or Power Controller Problems Check battery voltage multimeter (should be 3.7-4.2V) Fast discharge at low load Battery wear or background processes Replace battery or reset settings Phone overheats when charging Battery or Charging Controller Fault Check battery integrity and replace when bloated Charging is only off Problems with firmware or power controller Re-surrout phone or battery charge resetting from mother and motherboard reconnection after the mother's connection and withdrawal. Redmi Note 4 has a few key connectors that need to be turned off in the right order to avoid damaging the flexible cables: Unscrew all the screws that fix the metal plate over the plumes (usually 6-8 pieces of them). Carefully dent the plugs of the display plumes, touch panel and camera using a plastic blade. Pull by the tongue of the connector, not by the plume itself! Disconnect the battery connector (if you haven't already done this) and antenna cables (they can be carefully plugged to the phone, if you can not pay enough from the microphone to replace it with a microphone, if you pay it, if you are not to remove it from the microfly from the phone). 5 If you pay it, it is completely from the microfle it is completely from the microfoil, it is not to be removed from the battery. If the plume of the display or sensor is broken, it can be replaced separately. This will require: 1. Buy a new plume (the article depends on the version of the phone). 2. Carefully solder off the remnants of the old plume from the board (if it is soldered). 3. Connect a new plume, making sure that the correct orientation of the connector. In some cases, it is easier to replace the entire display module in the assembly. After removing the board, inspect it for darkening, bloated capacitors or oxidation. If you notice damage, you may need to diagnose the 2-C module with a multimeter screen (60 °, you will usually have to replace the screen with a display panel or a display panel with a display panel). Insert a plastic mediator between the screen and the body and gently steer it along the edge. Start at the bottom corner where the plume connector is located. After separation, disconnect the display and sensor plumes from the motherboard. If you only need to replace the glass, use a special glue (for example, if you need to replace only the glass, use a special glue, LOC or B-7000) To replace the main camera, you just need to disconnect the plume and unscrew the two screws that hold the module, and be careful, the camera is attached to the board, and it's easy to damage if you handle it in a careless manner. If you notice that after assembly the sensor does not work or the screen flickers, check: 🔌 Correct connection of the plumes (they must be inserted before clicking). 🧹 Cleanliness of contacts (if necessary, wipe them with alcohol). 🔧 Integrity of plumes (whether there are cracks or breaks). Typical mistakes and how to avoid them Even experienced craftsmen sometimes make mistakes when disassembling Xiaomi Redmi Note 4. Here are the most common of them and ways to prevent them: damage to plumes when sloppy disconnect. Always pull the connector, not the plume itself, and use plastic tools. Losing screws or installing them in the wrong holes. Store screws in the organizer and photograph their location before twisting. Overheating the plastic with a hairdryer, leading to deformation of the body. Keep the hairdryer at a safe distance and do not use the metal parts for a single second before you use the battery. If the phone does not turn on after assembly, check it out: 🔋 Battery connection (possibly the connector has left). 🔌 Integrity of the power button (it may not be fully pressed). 📱 Correct installation SIM-slack (sometimes it blocks the switching on). 💡If the phone doesn't respond to the power button after disassembly, check the battery and the button plume first. That's exactly what the problem is 80 percent of the time. The Xiaomi Redmi Note 4 should be built in reverse order, but with a few nuances in mind: Before installing the battery, clean the contacts on the board and battery with alcohol. Make sure that all the plumes are tightly connected and not twisted. When you install the back cover, heat it with a hair dryer so that the glue gets better. Swirl the screws cross-cross to avoid skewing the board. Once assembled, do a test: Check the sensor (swipe your finger across the screen). Make sure the cameras focus and don't produce artifacts. Test the sound in the speaker and microphone. Connect the charging and check the charge indication. If everything is working properly, install the back cover and hold it with glue or double-sided tape, and for reliability, you can put the phone under a press (for example, a stack of books) for 10-15 minutes. ⚠️ Warning: If the phone overheats or discharges quickly after assembly, it is likely that the battery is installed incorrectly or damaged! FAQ: Frequent questions about the dismantling of Xiaomi Redmi Note 4 Can you disassemble the Redmi Note 4 without a hairdryer? Yes, but it will be more difficult. The glue can be softened with isopropyl alcohol or gently tucked into the lid with a thin plastic card. But the risk of damage to the casing or plumes is much higher. What glue should I use for the battery? 3M or special glue for batteries (for example, T-7000). Don't use superglue or heat glue, they can damage the battery. What if the touchscreen doesn't work after disassembly? It's probably a problem in the sensor plume. Check: Correct connection of the plume to the motherboard. Integrity of the plume (whether there are any clamps or tears). Clean contacts (wipe them with alcohol) If the plume is damaged, it will have to be replaced. How to distinguish the original battery from a fake? The original battery for the Redmi Note 4 has: Xiaomi's clear labeling and articularity (MB38 or MB39). Smooth welding seams on the contacts, holographic sticker with serial number, capacity 4100 mAh (indicated on the label). Counterfeit products often have blurred labels, curved seams and understated capacity. Can you replace the microUSB connector yourself? Yes, but it will require a soldering station and experience with small electronics, soldered connectors to the motherboard, and if you change them carelessly, you can damage the tracks. If you don't have experience, you better go to the service center.