How to disassemble Xiaomi Redmi 4X: detailed instructions with photos and tips

Xiaomi Redmi 4X (codenamed santoni) is one of the brand’s most popular budget smartphones, released in 2017. Despite its simplicity of design, its disassembly requires care: a fragile fingerprint scanner plume, adhesive battery and thin latches of the rear cover can cause failure if you carelessly handle. This article will help avoid typical errors and conduct disassembly without damage, whether it is battery replacement, display repair or dust cleaning.

We will analyze each stage in detail - from tool preparation to motherboard removal, pay attention to the unique "pitfalls" of this model (for example, hidden latches under the tray). SIM-And we'll give you some feedback on the maps, and the instructions will be as good as the c version. 2/16 GB of memory, and for modifications with 3/32 GB – their design is identical.

Preparation for disassembly: tools and security measures

Before you start, make sure you have everything you need, and if you don't have at least one tool, you can damage the body or the internal components, for example, if you try to stick a knife in the back cover instead of a mediator, you're almost guaranteed to scratch or break the latches.

Here is a complete list of what you will need:

• 🔧 Plastic mediator (or guitar mediator) - to separate the body. Metal instruments should not be used!
• 🔨 The screwdriver. PH00 (magnetic preferable) - for screws of the back cover.
• 🔋 Suction (optional) – helps to raise the screen if you need to replace it.
• 🧲 Tweezers - for careful disconnection of plumes.
• 🔥 Dryer or thermoplatform – if you plan to remove the battery (the glue softens when heated to 60-70)°C).
• 📦 Container for screws - so as not to lose small parts (in Redmi) 4X 12 pieces!).

⚠️ Warning: If you are disassembling a battery replacement phone, completely discharge it before starting (up to 0%).This minimizes the risk of fire if the battery is accidentally damaged.Do not use metal tools to tamper with the battery - only plastic blades!

Also prepare the workplace:

• 🪑 Work at a table with good lighting (better to use a desk lamp).
• 🧹 Remove all unnecessary items – the lost screw can get into the smartphone when assembled.
• 📸 Take a picture of each stage of the dismantling (especially the location of the plumes.

Removal of the back cover: hidden latches and tray SIM-map

Let's start with the hardest part, the back lid. 4X It's mounted on 12 latches and two screws under the tray. SIM-Many newcomers miss screws and break plastic locks, trying to force the lid off.

Step-by-step:

1. Turn off the phone and remove the tray. SIM-map.
2. Under the tray you will see two screws - unscrew them with a PH00 screwdriver.
3. Put the mediator in the gap between the lid and the body at the socket 3.5 mm (the weakest point). Carefully guide the tool around the perimeter, snapping the locks.
4. Lift the lid on the side of the charging socket, it should separate without resistance. If the lid is "not responsive", check if all latches are snapped (especially in the area of the camera!).

⚠️ Attention: Do not pull the lid up by force - at the top it is connected to the fingerprint scanner plume! First, gently disconnect the plume with tweezers (it is fixed with duct tape).

If the lid is glued too much (for example, after previous repairs), you can slightly heat it with a hair dryer (not higher than 50 ° C) to soften the glue. But don't overdo it - overheating can damage the plastic!

Battery Removal: Risks and Proper Techniques

The battery in the Redmi 4X is glued to the body with double-sided tape, and its power plume is located under a metal protective plate. Incorrect extraction can lead to a short circuit or break of the battery!

Follow this algorithm:

1. Unscrew 4 screws that fix the metal plate above the battery (they are of different lengths - remember their location!).
2. Carefully put the plate on the mediator and remove it, and underneath it you'll see the battery plume -- unplug it with tweezers.
3. If the battery is swollen, don't try to bend or prick it! Heat the body with a hairdryer (60-70°C) around the perimeter of the battery, then tuck it with a plastic spatula. Use isopropyl alcohol (90%+) to dissolve the glue residue.
4. Use a new double-sided tape (e.g. 3M 9448A) to install the new battery. Don't skimp on glue - poor fixation can cause vibrations and damage to the plumes.

If the battery doesn't blow up but loses capacity, you can try to "reanimate" it with a deep discharge/charging cycle (but this is a temporary solution). BM43 or BD43 4100 mAh capacity.

Disconnection of plumes: fingerprint scanner, display and buttons

Once the battery is removed, you will have access to the main plumes. In the Redmi 4X, there are three:

1. The display plume (the widest, located at the top of the board).
2. The fingerprint scanner plume (thin, coming from the back cover).
3. Volume/power button plume (small, to the right of the battery).

To disconnect, use a plastic blade or tweezers. The rule is, don't pull the plume behind the wires, just behind the connector! In Redmi 4X, there are FFC/FPC connectors with latches that you need to lift before you remove them.

Pay special attention to the plume of the fingerprint scanner, which is fragile and often breaks when handled carelessly. If the scanner stopped working after assembly, check:

• 🔌 Is the plume connected correctly (sometimes it “pop out” when installing the cover).
• 🧹 Is there any dirt in the connector (wipe it with an alcohol tampon).
• 🔧 Are the contacts on the motherboard bent (use a magnifying glass for inspection).

💡

If the plume of the display has broken off from the connector, don't panic! You can solder it back with a soldering station and a thin solder, but you'd better trust it to a professional, because the wrong soldering can damage the board.

Removal of the motherboard: screws, antennas and speakers

The motherboard in the Redmi 4X is mounted on 8 screws (6 under the board and 2 under the metal protection of the camera).

• 📶 Antenna cables (2 pieces, glued to the cover - carefully peel them off).
• 🔊 Dynamic (twisted by one screw at the charging connector).
• 📷 Camera (unplug its plume, previously removing the metal protection).

After the screws are unscrewed, the board is usually stuck on the charging connector to extract it.

1. Carefully adjust the charge with the mediator from the USB-Type C.
2. If the board does not come out, check if you have forgotten to disconnect the plume of the vibromotor (it is located under the board, next to the SIM-tray).
3. Don’t put too much effort into it – if the board is sitting tight, you may have missed the screw under a safety sticker (like under the battery).

⚠️ Attention: On the back of the board, you have a microphone and a button plume connector. Don't put the board face down on the table, it can damage the components!

If you're disassembling a phone for board repairs (like replacing a charging connector), pay attention to the component markings. Redmi 4X often fails:

• 🔌 Power controller (MT6351) — short-circuit.
• 📡 Module Wi-Fi/Bluetooth (BCM4356) — fall-in.
• 🔊 Audio codec (RT5651) — If the sound is lost in the speaker or microphone.

Replacement of the display: features of the module and pitfalls

The Redmi 4X screen is a glued module (display + sensor + frame), so replacing the glass separately from the matrix is almost impossible. If the screen is cracked or broken pixels, you have to change the entire module.

To replace the display:

1. Heat the screen edge with a hair dryer (60–70°C) for 2-3 minutes to soften the glue.
2. Subdue the screen with a plastic spatula, starting from the lower right corner (there are fewer plumes).
3. Carefully separate the module, making sure not to break the plume of the backlight and proximity sensor.
4. Disconnect the plumes from the board and install a new screen. UV-glue 3M 9088.

Important nuances:

• 🔍 Before buying a new screen, check its compatibility. - For Redmi 4X Suitable modules with marking JDI NT35596 or BOE NT35596.
• 💡 If the screen flashes or does not turn on after replacement, check the contacts of the backlight plume - they often oxidize.
• 🔧 To calibrate the sensor after replacement, use the code ##6484## (display test menu).

💡

When replacing the display, never use superglue or moment! it can damage the plumes and make the screen irrepairable.Only specialized adhesive for displays (e.g. LOCITE 3301).

Reverse Assembly: Testing and Testing

The Redmi 4X should be built in reverse order, but with a few key points in mind:

• 🔩 Tighten the screws cross-cross to avoid skewing the fee.
• 🧹 Blow the body with compressed air before installing the battery – dust can cause a short circuit.
• 🔋 First turn on without making SIM-Memory cards and cards to check the basic functionality.

After assembly, be sure to test:

1. Charging (plug the charger and check the indication).


2. Sensor and fingerprint scanner (add a new print in settings).




3. camera and microphone (take a test photo and voice recording).




4. Sound in the speaker and headphones (play the music).




5. Communication (check signal strength and Wi-Fi operation).

If something is not working, take the phone apart and check:

• 🔌 Connect all plumes (especially fingerprint scanner and display).
• 🔧 Tightening of screws on the board (weakened screws can cause the “dump” of contacts).
• 📶 Integrity of antenna cables (if there is no network or Wi-Fi).

💡

If the phone overheats after assembly, check if you forgot to remove the protective film from the new battery or the thermal paste on the processor (if it was removed).

FAQ: Answers to Frequent Questions