How to disassemble a toothbrush Xiaomi Soocas X3: detailed instructions with photos and warnings

Electric toothbrush Xiaomi Soocas X3 — It's a popular model with ultrasonic technology, but even such a reliable device may require repair over time, and most often users experience bristles wear, breakage of the power button, or battery discharge that stops holding charge. Disassembling the brush is the first step to diagnosing and troubleshooting, but it should be done carefully so as not to damage fragile internal components.

Many are afraid to disassemble Soocas. X3 It's not as hard as replacing the battery in the remote, because you're afraid of breaking the sealed case or losing the warranty, but if you do it right, it's as hard as replacing the battery in the remote, knowing the mounting points, using the right tools, and avoiding brute force. In this article, we will analyze the process by steps, point out typical errors and suggest how to minimize risks.

If your brush stops turning on, doesn't hold a charge well, or makes uncharacteristic sounds, don't rush to throw it away. 80 percent of the time, the problem is solved by replacing the battery or cleaning the contacts, and you need to be able to properly disassemble the case without damaging the sealing gums and control board.

Preparation for disassembly: tools and precautions

Before starting the dismantling of Xiaomi Soocas X3, Get the workspace ready and the tools you need:

• 🔧 Plastic mediator or opener - for careful putting of the cover (metallic objects can leave scratches).
• 🔋 Thin screwdriver (cross, 1.5-2 mm) - for unscrewing screws inside the body.
• 🧲 Magnetic mat or container – so as not to lose small parts (screws, springs).
• 📸 Smartphone for photography – fix each stage, this will help to properly collect the brush back.
• 🧴 Isopropyl alcohol (70%+) — for cleaning contacts and oxidation board.

Work on a flat, well-lit surface. If the brush has been in water, dry it for at least 24 hours in rice or silica gel before disassembling - moisture inside the case can cause a short circuit when turned on. Also, never disassemble a brush connected to a charge - this can lead to electric shock or damage to the board.

⚠️ Attention: If your Soocas X3 Check the warranty period in the Mi Home app or on the box before work begins.

If you've never been electronic, practice on an old, unnecessary brush or watch YouTube video disassembly, which will help you understand how hard you can push the latches and how to properly hold the tool.

Step 1: Remove the nozzle and lower cover

Start by removing the removable nozzle. To do this, pull it down with force — it is attached to a metal pin with a magnetic lock. If the nozzle is not removed, do not pull it sharply: try to rotate it slightly left-right to loosen the fixation.

Once you remove the nozzle, you'll see a metal shaft that transmits vibration from the motor to the bristles. Don't try to pull it out, it's mounted inside the case and only removed when it's completely disassembled. Clean the shaft of plaque and paste residues with a cotton swab dipped in alcohol.

Now flip the brush over and find two screwdriver slots on the bottom cover (situated symmetrically near the charging pins). Put a plastic mediator in them and gently tuck the lid around as you move around. The lid holds on 4-6 plastic latches, so act smoothly so you don't break them.

Clean the brush of moisture and paste

Photograph the location of contacts

Use only plastic tools

Put the lid on different sides alternately-->

If the lid doesn't lend itself, don't use excessive force -- you may have missed one of the latches. X3 Sometimes there is an additional latch near the switching button.

⚠️ Attention: Under the bottom cover is a silicone sealing ring, and don't lose it or damage it, because it's responsible for the tightness of the casing. IPX7). When assembled, the ring should lie exactly in the groove, otherwise the brush will lose water resistance.

Step 2: Removing the battery and control board

After removing the cover, you will see:

• 🔋 Battery (lithium-ion, with a capacity of 800-1000 mAh).
• 📱 Control board with chip and charging contacts.
• 🔊 Vibration motor (cylindrical shape, soldered to the board).

Battery at Soocas X3 It's usually soldered to the board with two thin wires (red plus, black minus) and to remove it, you'll need a soldering iron with a thin stinger (not more than 30 watts) and solder. If you don't have soldering skills, you can gently snack on the wires with cutters, but then you'll have to solder new ones when you build them.

Before you sell off, take a picture of the location of the wires or mark them with a marker. A mistake in polarity when you reconnect can knock the board out of order. Also check the battery for bloating - if it is deformed, you can not pierc or heat it (the risk of fire!).

If you want to replace your battery, pick up a battery with the same parameters. For example, a battery from Xiaomi Mi Electric Toothbrush will do. T300 Or universal lithium-ion batteries of 10440 format. When soldering, do not overheat the board - keep the soldering iron stinger no longer than 3 seconds on each contact.

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If you don't have a soldering iron on hand, you can use a conductive glue (such as Contactol) to connect a new battery, but this method is less reliable and only suitable for temporary repairs.

Step 3: Disassembly of the upper part of the body (optional)

If the problem lies in the on button or vibration motor, you will have to disassemble the top of the Soocas. X3. It's harder than removing the bottom cover, because the body is glued together:

1. Heat the body with a hair dryer (temperature 50–60)°C) for 1-2 minutes to soften the glue.
2. Carefully insert a plastic mediator into the seam between the halves of the body and slowly guide it in a circle.
3. When resistance appears, slightly press, but not apply force - there may be latches inside.

After the separation of the housing, you will have access to:

• 🔘 The switch button (often sticking due to moisture intrusion).
• 🌀 Vibration motor (may require cleaning or replacement).
• 📶 Bluetooth antenna (if the brush is not synced with the application).

Pay special attention to the spring mechanism of the button - if it is not carefully disassembled, it can fly out and get lost. If the button does not work, check the integrity of its contacts on the board using a multimeter (in vertebrae mode).

⚠️ Attention: At the top of the Soocas body X3 You have a sealing pad around the motor, and if you damage it, it will lose water resistance, and when you assemble it, you'll need to put a thin layer of silicone lubricant on the gasket to make it better sealed.

Diagnosis of malfunctions: what and how to check

After disassembly, examine all components for visible damage, and here are the main symptoms and their possible causes:

The brush shall not be activated:

• 🔋 Battery discharged or swelled → replacement.
• 🔌 The contact boards are oxidized. → alcoholism.
• 💥 The charging controller burned down → pay-off.

The brush doesn't hold the charge:

• 🔋 Battery wear (capacity dropped below 50%) → replacement.
• 🔌 Poor contact of charging springs → flexion.
• 📱 Firmware failure → Resetting settings through the Mi Home app.

Weak vibration or extraneous sounds:

• 🌀 Wear of motor bearings → engine-change.
• 🧲 Waste got in the wall. → cleaning.
• 🔧 Motor attachment weakened. → screw-lift.

To check the battery, use a multimeter:

1. Put the device in voltage measurement mode (20V DC).
2. Connect the probes to the battery contacts (red to plus, black to minus).
3. The battery voltage should be 3.7–4.2V. If you show it below 3.0V — battery to be replaced.

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Most of the problems with Xiaomi Soocas X3 This is done by replacing the battery or cleaning the contacts, and only 10 to 15 percent of the breakdowns require repair of the board or motor.

Assembly of the brush after repair: step-by-step instructions

Collect Soocas X3 It is necessary in reverse order, but taking into account several nuances:

1. The sealing ring should lie exactly in the groove on the bottom cover, and if it shifts, the leakage will be broken.
2. Charging contacts should not touch the body - check their position before closing the lid.
3. Screw the screws cross-curl to avoid skewing the board.
4. Check the power button for performance before final assembly.

After assembly, perform the test:

• 🔌 Connect the brush to the charger and make sure the indicator lights up.
• 🔘 Press the power button - the motor should start smoothly, without jerks.
• 💧 Check the tightness by slightly wetting the body with water (don't dive completely!) If moisture penetrates inside, disassemble the brush and check the seals.

If the brush does not work after assembly:

• Check the polarity of the battery – you may have confused plus and minus.
• Make sure all the plumes and wires are connected to the board.
• Check the fuse on the board (if any) - it could burn out when soldering.

If done right, your Soocas. X3 Clean the charging contacts regularly and avoid a long stay of the brush in a moist environment (for example, in a bathtub without airing).

Where to buy spare parts for Xiaomi Soocas X3

Parts for Soocas X3 You can find the following places:

• 🛒 AliExpress – search by request: “Soocas” X3 battery, "Xiaomi toothbrush motor." Prices: battery - 3-7$, motor - 5-12$.
• 🏬 Local service centers – some workshops sell used parts after repairs.
• 🔧 Specialty stores (e.g. Fixez, RepairUniverse) – original details can be found there.
• 📦 Donor brushes – Avito or Yula often sell broken Soocas X3 at a price of 500-1000 rubles.

When buying a battery, pay attention to:

• Capacity - must match the original (800-1000 mAh).
• Dimensions – the battery must fit in the compartment (standard: diameter 10 mm, length 40 mm).
• Type of connector – wires must be long enough for soldering.

For the engine is critical size - in Soocas X3 The engine is used with a diameter of 6-8 mm and a length of 20-25 mm, T300 or T500), but it may require reworking of the attachments.

⚠️ Warning: When buying parts on AliExpress, check reviews - some sellers ship batteries with understated capacity.$ The battery is a reason to be alert.

Frequent mistakes in disassembly and how to avoid them

Even experienced craftsmen sometimes make mistakes when repairing Soocas. X3. Here are the most common of them and ways to prevent them:

Damage to the latch of the shell

Many people break plastic latches trying to open the lid with a screwdriver. Solution: Use only a plastic mediator and heat the case with a hairdryer to soften the plastic.

2. Loss of the O-ring

Without sealing gum, the brush will lose water resistance, so you can take a picture of the ring's location before disassembling it or stick it with tape to the lid.

3. Overheating of rationing fees

Excessive heating can peel off tracks or damage the chip. Solution: Use a soldering iron with a power of no more than 30 watts and solder with flux.

4. Incorrect battery polarity

If you mix up plus and minus, the board can burn, so you can mark the wires with a marker before you sell them off or take a picture.

5. Damage to the button plume

The thin wires of the power button are easy to break, so don't pull the plume, but gently smack it with a plastic blade.

If you make one of these mistakes, don't panic. In most cases, you can fix the situation:

• Broken latches - glue the body with epoxy resin.
• Lost ring - replace with a similar one from another brush or cut from a silicone sealer.
• Burned fee - order a new one on AliExpress (price) ~15–20$).

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90% of malfunctions of Xiaomi Soocas X3 Only 10 percent require major repairs to the board or motor.

FAQ: Answers to Frequent Questions