Xiaomi Redmi Note 4 Global (codenamed mido) remains one of the most popular self-repair smartphones due to its modular design and availability of parts. However, disassembling this device requires care: improper actions can damage the plumes, tear off contact areas or even permanently fail the power controller due to static electricity. In this article, a detailed guide with the nuances of the Global version, which differs from the Chinese modification by the unsweeting of antennas and the location of some components.
Are you planning to replace the battery, screen or speaker? Or just want to clean the device of dust? In any case, before starting work, it is worth assessing the risks. For example, after disassembly, you may need to repaint the sensor (if you took a display module), and the wrong connection of the camera plume often leads to artifacts in the photo. We will analyze the process from A to Z — from tool preparation to reverse assembly to check functionality.
Preparation for disassembly: tools and security measures
Before you start, make sure you have everything you need. The Redmi Note 4 Global is sorted out using the standard smartphone toolkit, but some details (like the screws under the back cover) require a special approach.
- 🔧 Plastic blades (preferably a set with different thickness - to disconnect the cover and plumes)
- ⚙️ Screwdriver cross (PH00) and a star (T3) screw
- 🔥 Dryer or thermo-air station (to soften the adhesive under the battery)
- 🧲 Magnetic mat or screw container (so as not to lose small details)
- 📱 Suction (to remove the screen if you are planning to replace it)
- 🔋 Multimeter (to check battery voltage before shutdown)
Pay special attention to antistatic protection. Redmi Note 4 is sensitive to static electricity, especially chips. PMIC (power controller and RF-Use an antistatic bracelet, turn off your smartphone and wait for the capacitors to run full (at least 10 minutes after turning off).
⚠️ Warning: If you're disassembling a device with a broken screen, be sure to tape it with tape before you start work. Shattered glass can damage the plumes or get inside the case, which Later will lead to a short circuit.
Removing the back cover: secrets and pitfalls
The back cover of the Redmi Note 4 Global is mounted on latches and glue. Unlike the newer Xiaomi models, there is no smooth "clicking" here - you have to make an effort, but without fanaticism. Start by warming the edges of the cover with a hairdryer (temperature not higher than 60 ° C, so as not to damage the plastic), then insert a plastic blade into the gap between the cover and the case at the headphone jack - this is the weakest place.
Move the shoulder blade along the perimeter, gradually snapping the clamps. Be careful about the antenna lines (they are located on the sides near the volume buttons) - here the lid is tighter. If you hear a crunch, stop immediately: most likely, one of the latches has burst. In this case, continue carefully, but note that when you reverse assemble the lid may sit less tightly.
☑️ Preparation for lid removal
After removing the cover, you will see:
- 🔋 Battery (stick to the body)
- 📶 Antenna modules (do not touch them unnecessarily!)
- 🔊 Speaker and microphone (mounted on a metal frame)
- 📱 Camera and fingerprint sensor plumes
⚠️ Attention: The Global version has a shorter fingerprint sensor plume than the Chinese version, and if you pull it by accident, the contacts may break away from the board.
Battery shutdown: why it's critical
Before you touch any part inside your smartphone, be sure to turn off the battery. Even when it's off, there's a voltage on the board that can damage components when you short-circuit it. On the Redmi Note 4, the battery connector is placed under a black protective film -- gently slap it with a spatula.
The battery connector is locked in a latch. Pull it up (towards the screen) with a plastic blade, then carefully pull the plug. Don't pull the wire! The Global version often has a problem with oxidizing the connector contacts -- if you notice a green coating, clean it with alcohol and a cotton swab.
| Action. | Risk | How to avoid |
|---|---|---|
| Shutting off the battery without fixing the latch | Damage to contact on board | Use a plastic spatula, not a metal one. |
| Touching the board without antistatic protection | Failure of PMIC or Wi-Fi module | Working in an antistatic bracelet or on a grounded mat |
| Strong pressing of the battery when removed | Battery puncture or bloating | Use a plastic mediator, not sharp objects |
| Dryer overheating | Fire or deformation | Keep the hair dryer at a distance of 10 cm, the temperature is not higher than 60 ° C |
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If the battery is swelling, do not try to remove it yourself - the risk of fire is too high.
Removal of the motherboard: step-by-step instructions
The Redmi Note 4 Global board is mounted on 12 different size screws. Remember the location of each screw -- if you build it back, the entangled mounts can damage the board. Start by disconnecting all the plumes:
- Main camera plume (black connector, located closer to the upper edge of the board).
- Fingerprint sensor plume (white connector, under a metal frame).
- The plume of the display module (the widest, at the bottom of the board).
- The charger's tail (a small white connector at the bottom edge).
Once the plumes are unplugged, unscrew all the screws. Start with the ones under the metal frame (they are longer than the others), then gently tuck the board with a plastic blade on the USB-Type C side of the connector, there are no components that can be touched.
If the fee is "not amenable," check:
- 🔌 Are all plumes disconnected (especially the plume of the vibrator - it is easy to miss).
- 🔧 All screws are twisted (sometimes one screw hides under the sticker).
- 📶 Have the antenna wires caught on the edges of the board.
What to do if the fee is “stick” to the body?
Battery replacement: nuances for the Global version
The battery in the Redmi Note 4 Global has a capacity of 4100 mAh and is glued to the body with double-sided tape.
- Warm the body with a hair dryer (60°C) for 2-3 minutes to soften the glue.
- Carefully tamper with a plastic blade from the edge where there are no components of the board.
- Put a thin plastic card under the battery and slowly "cut" the glue, moving along the body.
In the Global version, the battery often has an extra heat pad between the battery and the processor, and don't lose it when you take it off, it prevents the chipset from overheating.
- 🔋 Check the voltage with a multimeter (should be) ~3.7–4.2).
- 🧹 Clean the contacts with alcohol from glue residues.
- 📏 Make sure the new battery is the same thickness (bloated batteries are thinner than the original ones!).
⚠️ Warning: If after replacing the battery, the smartphone does not turn on, check the fuse on the board (marking) F1 It could have burned if it shorted out. Replacing the fuse requires soldering skills.
Display module disassembly: when necessary
The Redmi Note 4 Global display has three layers: touch glass, LCD, and backlight. If you only have cracked glass, you can replace it separately, but that requires special re-painting equipment, and in most cases it's easier to replace the entire module.
For screenshots:
- Warm up the edges of the display with a hairdryer (60°C) for 3-5 minutes.
- Suction suction to the bottom of the screen (where the Home button is located).
- Carefully pull up, simultaneously putting the screen on a plastic spatula.
- Disconnect the display plume (it is fixed with a latch - lift it up).
Notice the sensor plume, which is separate from the display, and is often glued to the frame.
- 📱 Make sure that the plume is not bent and clamped with the body.
- 🔧 Twirl the screws of the screen attachment in the order "diagonally" (so the pressure is evenly distributed).
- 🧹 Remove all traces of old glue from the frame – the new glue should fall on a clean surface.
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If you've got dead zones after you change the screen, or if the sensor doesn't work, it's likely that the plume is not connected tightly or damaged. Take the device apart again and check the contacts.
Reverse Assembly: How to Avoid Mistakes
The Redmi Note 4 Global should be assembled in reverse order, but with a few critical points in mind:
- Plugs: Last thing you do is plug them in when the board is already locked in by the screws. Start with the charging plug plume, then the display, then the camera and the fingerprint sensor.
- Screws: Use a magnetic mat to avoid confusing their length. The screws under the antenna are shorter than the others!
- Glue: Use 3M double-sided tape or B-7000 glue for the battery. Don't put glue on the board!
- Check: After assembly, turn on the smartphone and check: 📶 Network operation (call and check the internet). 🔊 Sound in the speaker and microphone. 📷 Camera (take a test shot). 🔋 Charging (plug the cable and make sure the current is going on).
If after assembly the smartphone does not turn on:
- 🔌 Check battery connection (frequent error - not fully inserted connector).
- 🔧 Make sure all screws are twisted (unpatched screws can cause short circuits).
- 📱 Connect to the charger on 10-15 Minutes – sometimes the capacitors are completely discharged.
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If the smartphone discharges quickly after replacing the battery, calibrate the battery: completely discharge the device, then charge to 100% without interruptions. Repeat 2-3 times.