Disassembly of the toothbrush Xiaomi T500: a full guide with photos and tips

The Xiaomi T500 electric toothbrush is a popular model with a good balance of price and functionality, but over time even it requires maintenance. Dust, moisture and wear of parts can lead to performance loss or breakdowns. Disassembly of the device may be necessary to clean internal components, replace the battery, repair the engine or fix power button malfunctions.

In this article, you will find step-by-step photo instructions, tooling tips and warnings about common errors, and we will also tell you how to avoid damage to the case and electronics, and at the end we will answer frequent questions from users. If you have never disassembled such devices, don't worry: with the right approach, the process will take no more than 20-30 minutes.

Preparation for disassembly: tools and security measures

Before you start, make sure you have everything you need. The Xiaomi T500 has a compact body with latches, so without special tools, it is easy to damage.

• 🔧 Plastic mediator or opener (to carefully separate parts of the body). Metal objects can not be used - they leave scratches.
• 🔋 Thin screwdriver cross (PH00) The usual screwdriver may not fit because of its small size.
• 🧴 Isopropyl alcohol (70% or higher) for cleaning contacts and boards!
• 📦 Container for small parts (screws, springs, rubber pads) They are easily lost.
• 📸 Smartphone to take pictures of the process, which will help you put the brush back together properly.

Important: before disassembling, fully discharge the battery (before turning off the brush) and leave it for 10-15 minutes, this minimizes the risk of short circuits in the event of an accidental grazing of contacts, and also work on a clean, well-lit surface - a lost cog inside the case can cause a malfunction.

⚠️ Note: If the brush is warranty, disassembly will cancel it. Xiaomi does not provide official spare parts for self-repair - all parts will have to be ordered from third-party sellers.

Step 1: Remove the nozzle and lower cover

Start by removing the removable brush nozzle. To do this, pull it up with a little effort, it's attached to a magnetic holder. Under the nozzle, you'll see a metal rod that transmits rotation from the engine. You don't need to touch it.

Then flip the brush over and look at the bottom cover, and it's mounted on two latches on the sides and one locker near the charging connector, to remove it.

1. Insert a plastic mediator into the gap between the lid and the case at the charging connector.
2. Carefully slap the lid on the mediator along the seam, and you'll hear a slight click, and the first lock has snapped.
3. Repeat the action from the opposite side.
4. Remove the lid by pulling it down. Don't put too much effort into it, there may be wires inside!

Under the lid, you'll see the battery (usually soldered to the board), the charging contacts and part of the engine. If your goal is to replace the battery, you can stop at this point.

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If the cover does not respond, heat it with a hair dryer (temperature not higher than 50 ° C) for 1-2 minutes. The plastic will become softer, and the latches will snap more easily.

Step 2: Separation of the case and access to the board

The Xiaomi T500 has two halves held together by four screws (two on each side) and perimeter latches, hidden under rubber plugs that need to be gently tucked with a nail or a plastic blade.

After removing the screws, insert the mediator into the gap between the halves of the case (better start at the power button side) and lead it along the seam, alternately snapping the locks. Be careful: there is a flexible plume inside that connects the board to the button. It is easy to damage!

Remove all 4 screws | Check no hidden latches |Put the case on the side of the button |Do not pull too hard - otherwise the train will break-->

When the body is apart, you'll see:

• 🔋 Battery (usually 800–1000 mAh) with soldered wires.
• ⚙️ Engine with gearbox responsible for rotation of the nozzle.
• 📱 Control board with chip and charging contacts.
• 🔘 Power button (can be soldered to the board or connected by a plume).

⚠️ Warning: If you disassemble a brush due to water, do not turn it on until it is completely dry (minimum 48 hours in rice or silica gel). Even if the device works after getting wet, corrosion on the board may occur later.

Step 3: Removing the battery and board

The battery in the Xiaomi T500 is usually soldered to the board with two wires: red (+) and black (-).

1. Take a picture of the location of the wires.
2. Heat the contacts with a soldering iron (temperature not higher than 300 ° C) and carefully separate the wires.
3. Put a plastic spatula on the battery – it can be glued to bilateral tape.

The control board is attached to the body with two screws. Unscrew them and carefully remove the board, holding it by the edges. Don't touch the contacts with your fingers, static electricity can damage the chip.

Step 4: Cleaning and Diagnosing Internal Components

If the purpose of disassembly is preventive cleaning, pay attention to the following areas:

• 🧹 Engine gear: dust and dried toothpaste accumulate here. Use a cotton swab dipped in alcohol.
• 💧 Charging contacts: oxidation leads to poor contact. Clean them with a lasticle or alcohol.
• 🔌 Control fee: inspect for burnt tracks or bloated capacitors.

For the diagnosis of malfunctions:

• Check the multimeter voltage on the battery (should be 3.7-4.2V).
• If the engine is not rotating, apply the voltage directly to it (shortly!).
• Call the power button - when pressed, the resistance should be close to 0 Ohms.

Step 5: Replace the battery or other parts

If you are replacing the battery, choose a model with the same parameters:

• Capacity: 800–1000 mAh (original usually 850 mAh).
• Voltage: 3.7V (lithium-polymer or lithium-ion).
• Dimensions: No larger than the original (usually 30×20×5 mm).

Solder the wires quickly so as not to overheat the battery. After replacement, let it cool for 5-10 minutes before first turning on.

To replace the engine or control board, look for parts marked compatible with the Xiaomi T500. Make sure the connectors and mounts match the original. In some cases, you may need to solder the plumes - if you are not sure about your skills, you should contact the master.

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When replacing the battery, never use high voltage models (e.g. 7.4V) as this will cause the control board to burn.

Step 6: Building a brush and checking the performance

Collect the device in reverse order, following your photos.

• 🔩 Screw them: twist them cross-cross to avoid skewing the body.
• 🔌 The button plume: it should lie flat, without clatters.
• 🔋 Battery: Make sure the wires are not stretched or touching the engine.

After assembly:

1. Put the brush on the charge for 30 minutes.
2. Check the button and charge indicator.
3. Make sure the nozzle rotates without any extraneous sounds.

If something is not working properly, take the brush apart again and check:

• The polarity of the battery connection.
• Quality of contacts on the board (maybe you need to solder).
• The engine fixing - it shouldn't hang around.

Frequent Mistakes and How to Avoid Them

Even with careful disassembly, you can make mistakes that will lead to breakdown.

• 🔧 Use of metal tools → scratches on the body or short circuit. Always use a plastic mediator.
• 🔥 Overheating at soldering → The soldering iron should not be more powerful than 30 watts, and the time of touch should not exceed 2-3 seconds.
• 💦 Liquor on the charge → Apply alcohol only to the cotton swab, not the components.
• 🔋 Replacing the battery with an incompatible → bloating or fire. Check the parameters before buying.

If you doubt your abilities, it is better to contact the service center. The cost of repairing the Xiaomi T500 usually does not exceed 1000-1500 rubles, which is cheaper than buying a new brush.

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The most common cause of breakage after disassembly is the wrong assembly of the button plume, and if the brush doesn't turn on, 70 percent of the time it's the button plume that's to blame.

FAQ: Answers to popular questions