Xiaomi Redmi Note 4X — One of the most popular smartphones of 2017, still in use today, but over time, even such a reliable device may require repairs: a battery replacement, a display, a speaker, or even a motherboard. If you decide to disassemble your phone yourself, this article will help you avoid typical mistakes, save time and not damage fragile components.
The Redmi Note Disassembly 4X (The codename mido has its own nuances: there is no removable back cover, and the body is glued around the perimeter, and without the right tools and knowledge, you can easily damage plumes, tear contacts off, or even break plastic latches. We will analyze each stage in detail - from preparing the workplace to extracting the motherboard - and also tell you what mistakes beginners most often make and how to avoid them.
Important: If you've never taken a smartphone apart before, practice on an old device or watch video disassembly. 90% of self-repair damage is due to rushing or using inappropriate tools (such as metal blades instead of plastic mediators).
Preparation for disassembly: tools and security measures
Before you get started, make sure you have everything you need. without the right Redmi Note disassembly tools 4X It can turn into a nightmare, like a chipped screen, a torn plume, or a scratch on the body:
- 🔧 Set of screwdrivers (cross-haired) PH00 and flat 1.5 mm - for screws of the body and plumes).
- 📱 Plastic mediators (2-3 pieces of different thicknesses) or special blades for disassembling smartphones.
- 🔥 Hair dryer or thermal air station (to soften glue around the perimeter of the screen).
- 🧲 Magnetic mat or screw container (so as not to lose small details).
- 🔋 Suction (to lift the screen after heating).
- 🧴 Isopropyl alcohol 90%+ (Cleaning contacts and removing glue residues).
- 📦 Loop or magnifying glass (for inspection of small connectors).
Also, prepare the workspace: the desk should be clean, well-lit and without static electricity (ideally an antistatic mat). SIM-If the battery is swollen, you'd better leave the disassembly to the professionals, because the risk of short circuit is too high.
⚠️ Warning: Don't use metal blades or knives to tweak the body! Even a little pressure can damage plumes or leave scratches on an aluminum frame.Plastic mediators cost pennies but save you from costly mistakes.
If you are planning to replace the battery, order the original battery with capacity in advance. 4100 mAch (article) MB51). Cheap analogues often have a smaller capacity and can swell in a few months. JD9265-001 (touchscreen).
Step 1: Remove the back cover and battery
We start with the hardest part, the back compartment. 4X It's glued all over the perimeter, so you can't do without heating:
- Heat the body with a hair dryer around the perimeter (temperature) ~60°C) during 2-3 Don't send hot air to one place for too long, you can damage the plastic or the display.
- While the glue is softening, apply the lid to a plastic mediator in the area of the charging connector, which usually has a small gap.
- Carefully swipe the mediator along the entire perimeter, separating the lid from the frame. If you feel resistance, heat the problem area again.
- When the lid is detached, don't remove it completely, it's connected to the fingerprint scanner plume, and turn off the plume by the tongue.
Now you can take out the battery. It's glued to the body, so:
- 🔋 Tap the battery with a plastic blade on the side (where there are no components on the board).
- 🧴 If the glue is too strong, drop a little isopropyl alcohol under the battery - it will dissolve the adhesive.
- ⚡ Do not use metal tools or press the center of the battery – the risk of short circuit!
⚠️ Warning: If the battery is swelling (as seen from the deformation of the lid), do not try to remove it yourself. Bloated batteries can ignite when mechanically exposed.
Once the battery is removed, inspect it for damage, if there are traces of oxidation or corrosion on the board underneath, they need to be cleaned with alcohol and brush, and check the charging connector, which is often due to contamination.
Battery plume disabled|The fingerprint scanner's plume is disabled.|The location of the screws is photographed|Checked all the connectors on the board|Prepared space for storage of small details-->
Step 2: Disconnecting the plumes and removing the motherboard
Redmi Note motherboard 4X It's mounted on multiple screws and connected to other components by multiple plumes:
- Unscrew all the screws on the board (there are around them). 10-12 Use a magnetic screwdriver to keep them from getting lost. Rotors of different lengths, remember where the screwdriver was.
- Turn off the plumes in that order: 📞 Display plume (the widest, at the top of the board). 🔊 Dynamics and microphone plume (thin, right). 📷 Camera plumes (two thin, in the upper left corner). 🔋 The power and volume button plume (small, right).
Carefully pay the fee.
If the board fails, check if all screws are unscrewed and the plumes are off, and it's a common mistake to forget about the screw under the sticker or not notice the small Wi-Fi antenna plume.
| Component | Location on board | Typical problems |
|---|---|---|
| Snapdragon 625 processor | Board centre, under metal screen | Overheating with a faulty thermal interface |
| EMMC memory | Under the processor, a small chip. | Reading/Write errors in falls |
| Module Wi-Fi/Bluetooth | Upper left corner | Loss of signal when antenna damage |
| Charging connector USB Type-C | The bottom edge of the fee | Oxidation of contacts, breakages of paths |
After removing the board, check it for swollen capacitors, corrosion marks, or chips. If the phone didn't turn on before disassembly, check:
- 🔌 Integrity of tracks near the charging connector (often detached when falling).
- 🔥 Darkening on the board - a sign of a short circuit.
- 📡 The status of antenna contacts (if there were problems with the network).
💡
If you're charging a charger replacement card, pre-check it with a multimeter in "vertebrate" mode. Often the problem isn't the connector, but the power controller on the board.
Step 3: Disassembly of the display module
Redmi Note Display 4X It's made up of several layers: glass, touch panel, matrix, and backlight. If you're only replacing glass, you're going to need a special glue and a little bit of light. UV-A complete module replacement is easier:
- Heat the screen with a hair dryer (temperature) ~50°C) perimeter during 1-2 minute.
- Put a suction cup or a plastic spatula on the display from any angle. Be careful, the glass is very fragile.
- Disconnect the matrix plumes and touch screen (they are located under the metal cover on the board).
- Remove the frame (if it is damaged, replace it with a new one).
If the screen is cracked, but the touchscreen is working, you can try replacing the glass.
- 🔥 Heat the display to ~70°C to soften the glue.
- 🧊 Carefully separate the glass from the sensor layer with a string or special device.
- 🖌️ Put on a new glue (LOC or OCA) And stick the new glass using UV-polymerization lamp.
⚠️ Note: If you replace the glass without experience, it is easy to damage the polarization layer of the matrix. If after gluing the screen becomes dull or with iridescent splits, the layers have shifted, and the module will have to be completely changed.
To check the health of the new display, temporarily connect it to the board (without screws fixing) and turn on the phone. If there is an image, but the touchscreen does not respond, the problem is in the plume or controller.
What if after changing the screen appeared vertical stripes?
Step 4: Replace the speaker, microphone and other components
If the problem isn't with the display or battery, it may be the peripheral components that are to blame. - Redmi Note 4X most often:
- 🔊 Dynamic (article) 1403-00045) — stops working after moisture or mechanical damage.
- 🎤 Microphone (article) 1403-00046) — Problems with voice transmission during calls.
- 📡 Antenna module – poor reception of network or Wi-Fi.
- 🔋 Vibromotor - Vibration does not work.
To replace the speaker:
- Unscrew the screws holding the metal cover above the speaker (at the bottom of the body).
- Disconnect the speaker plume from the charge.
- Carefully remove the old speaker and install a new one by fixing it with glue B-7000.
The microphone and vibrator are replaced in a similar way, and the antenna module is glued to the back cover, and it will require a complete disassembly of the body to replace it.
If it does not work after replacing the component, check:
- 🔌 Correct connection of the plume (sometimes it is inserted "upside down").
- 🔧 Integrity of contacts on the board (possibly departed during soldering).
- 📱 Part compatibility (some "universal" speakers are not suitable for impedance).
💡
Always check their items against the original ones before buying parts. For example, the speaker from the Redmi Note 4 (without the letter X) will not work for the Note. 4X jack-up.
Step 5: Build your phone and check its health
Build Redmi Note 4X It should be in reverse order, but with some nuances:
- Check all the plumes, they should be tightly inserted into the connectors. If the tongue of the connector is broken, fix the plume with a drop of glue. B-7000.
- Put the board in place and twist the screws. Don't drag them over, you can damage the tracks.
- Put the battery on and check the phone before the lid is installed, and if something doesn't work, it'll be easier to disassemble.
- Apply a new glue to the back cover (use double-sided scotch) 3M 9088 or liquid glue T-7000).
- Close the lid and warm it up with a hair dryer for better fixation.
After assembly, check:
- 🔋 Charging (plug the cable and make sure the current is coming).
- 📞 Quality of communication and microphone performance (call another phone).
- 🔊 Sound in the speaker and headphones.
- 📷 The camera operation (take test pictures).
- 👆 Touch screen (check multi-touch in the engineering menu by code ##6484##).
If the phone is not turned on, check:
- 🔌 Correct battery connection (sometimes the plume is not fully inserted).
- 🔥 Integrity of fuses on the board (they can be "call" by multimeter).
- 📱 Firmware compatibility (if the board has been replaced, it may be necessary to flash it over again).
⚠️ Warning: If the phone overheats after assembly, turn it off immediately! Possible causes: short circuit on the board, improperly installed thermal interface or damaged processor.
Common Mistakes and How to Avoid Them
Even experienced craftsmen sometimes make mistakes when disassembling the Redmi Note 4X. Here are the most common of them and ways to prevent them:
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Use of metal tools | Scratches on the body, torn plumes, short circuit | Use only plastic mediators and shoulder blades |
| Hydrogen overheating | Deformation of plastic, detachment of the sensor from the matrix | Keep the temperature at 60.°C, heat evenly |
| Loss or entanglement of screws | Flawed fitting of the board, damage to the tracks | Store screws in a magnetic mat with marking |
| Strong pressure on the screen when removed | Cracks on the matrix, damage to the backlight | Drink only with heating, use a suction cup |
| Ignoring inspection before assembly | Re-disassembly, risk of new damage | Test all functions before final assembly |
Another common problem is that the fingerprint scanner plume is damaged, which is very thin and easily breaks when it is neatly shut down. If the scanner stops working after disassembly, check:
- 🔌 Integrity of the plume (sometimes it is rubbed against the body).
- 🔧 Cleanliness of contacts (wipe with alcohol).
- 📱 Settings in the system (Settings) → Lockdown and protection → Fingerprints).
If you have damaged the plume, it can be replaced (article) 1520-00034), But it requires soldering. In most cases, it's easier to turn off the scanner in the settings and use a pattern lock.