Disassembly of electric screwdriver Xiaomi: a complete analysis with photos and repair tips

Xiaomi electric screwdrivers (e.g. WoWstick models) 1F+, MiJia Electric Screwdriver or Dreame T20) They've become popular because they're compact, powerful and convenient, but even the most reliable technology breaks down, the battery runs out, the engine runs out, or the bit-change mechanism breaks down, and in most cases, you can repair it yourself, if you know how to properly disassemble the screwdriver without damage.

In this article, you will find a step-by-step photo instruction, a list of tools you need, and unique tips for disassembling models with magnetic bit mounting and fast battery replacement. We will also tell you what mistakes beginners most often make and how to avoid them. If your Xiaomi screwdriver stops spinning, does not hold a charge or makes extraneous sounds, this guide will help diagnose the problem and fix it without contacting the service.

Which Xiaomi models are to be disassembled?

Not all Xiaomi electric screwdrivers can be disassembled at home; some models (such as the MiJia Electric Screwdriver Pro) use glue and ultrasonic welding, making disassembly without special equipment almost impossible, but most popular devices are relatively easy to disassemble.

Here is a list of models that can be disassembled on their own:

• 🔧 Xiaomi WoWstick 1F+ — classic.
• 🔧 Xiaomi MiJia Electric Screwdriver (MWS01ZM) — budget version with magnetic bit holder.
• 🔧 Dreame T20 — fast-clamping screwdriver.
• 🔧 Xiaomi Youpin WoWstick 1F — First version with a simplified design.

Important: Pro or Max models often have a non-disassemblable body, and before starting work, check if the body has a No disassembly or a cross-key icon.

Necessary tools for disassembly

To disassemble the Xiaomi screwdriver without damage, you will need:

• 🔨 Plastic blades (or mediators) - for neat opening of latches.
• 🔨 Cross screwdriver (usually) PH00 or PH0) — hull-rotor.
• 🔨 Tweezers – to extract small details.
• 🔨 Solding iron (when replacing the battery or board).
• 🔨 Multimeter – to check the voltage of the battery.

For some models (e.g. Dreame) T20) You may need a special screwdriver with a security-beat (star or shamrock) if you don't have one, you can carefully drill the screws with a drill, but it's risky.

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Before disassembling, take a picture of the screwdriver body from all sides - this will help to properly collect it back, especially if the latches or screws are of different sizes.

Step-by-step instructions: how to disassemble the body

Disassembly begins with the removal of the top cover. In most Xiaomi models, the case consists of two halves, held together by latches and 3-5 screws.

1. Unscrew all the visible screws on the back cover, usually hidden under rubber legs or stickers. Use a cross screwdriver. PH00.
2. Carefully apply the lid to the plastic blade, starting at the junction of the halves, and move around the perimeter so that the latches do not break.
3. Disconnect the battery plume (if any). In WoWstick models, the battery is often soldered to the board - it needs to be soldered off.

Inside you'll see:

• 🔋 Battery (usually) 3.7V 2000mAh or 7.4V double-banked).
• ⚙️ Reduction engine.
• 📱 Printed board with on button and LED.

Warning: MiJia Electric Screwdriver models often use a hidden screw under the bit holder, which requires a counterclockwise round to reach (sometimes requires effort).

Disassembly of the mechanical part: gearbox and cartridge

If the Xiaomi screwdriver buzzes but doesn't twist the bat, the problem is probably the gearbox or the cartridge.

1. Remove the top cover (as described above).
2. Disconnect the control board from the engine.
3. Unscrew 2-3 screws that attach the engine to the body.
4. Carefully remove the engine with the gearbox. In some models, the gearbox is glued to the shoulder blade.

Design features:

If you hear a crunch or a grinding sound, you probably have worn gears of the gearbox, which can be replaced (bought on AliExpress) or lubricated with lithium lubricant (not greased). WD-40!).

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In 80% of cases, the “defunct” screwdriver Xiaomi is restored after cleaning the gearbox from the old lubricant and replacing the gears.

Replacement of the battery: nuances and schemes

The most common problem is a bloated or incontinuous battery. Xiaomi screwdrivers usually have 18650 lithium-ion batteries or flat Li-Pol.

1. Pay off the old battery from the fee (mark) + and −!).
2. Sell a new battery of the same capacity and voltage (for example, 3.7V 2000mAh).
3. Check the multimeter voltage on the board contacts (should be 3.7–4.2V).

Attention, WoWstick models. 1F+ The battery is often glued to the body. To extract it, use isopropyl alcohol, which dissolves the glue without damaging the plastic.

The battery connection schemes in popular models:

• 🔋 MiJia Electric: Two wires (red — +, black — −) + thermistor.
• 🔋 Dreame T20: plug-in JST 2.0 with anti-pole protection.
• 🔋 WoWstick: direct soldering to the board without a connector.

Diagnostics and repair of management board

If the screwdriver doesn't turn on or if it's jerking, the problem could be the control board.

• 💥 Burned. MOSFET-transistor (responsible for supplying current to the engine).
• 💥 Oxidized button contacts.
• 💥 Damaged charge controller (if the charging indicator is not lit).

For diagnosis:

1. Call the multimeter circuit from the battery to the engine.
2. Check the resistance of the button (in the off state should be ∞, on-set - 0 ohms).
3. Check the fee for darkened or bloated parts.

If you are not familiar with soldering, it is better to order a new fee (cost - from 500 to 1500 rubles depending on the model). 1F+ board often fails due to dust - it can be cleaned with alcohol solution.

Assembling the screwdriver after repair

You need to collect the screwdriver in reverse order, but there are several key points:

• ⚙️ Before assembly, lubricate the gearbox (use a gear lubricant, such as Molykote).
• ⚙️ Make sure the battery plume is not clamped over by the body.
• ⚙️ Twisting the screws cross-cross to avoid skewing the cover.

Attention! In MiJia Electric Screwdriver models, the charging indicator may not work after assembly, and this is due to the micro-switch under the lid, which needs to be corrected with tweezers.

After assembly, check:

1. The power button.
2. The direction of rotation (should coincide with the marks on the body).
3. Charging (connect to) USB Make sure the indicator is on).

Frequent Mistakes and How to Avoid Them

Beginners often make mistakes that lead to screwdriver failure.

• ❌ Use of metal tools to open the body → scratches or broken latches.
• ❌ Overheating with a soldering iron when replacing the battery → slack off.
• ❌ Incorrect polarity when connecting the battery → burner.
• ❌ Loss of screws or springs → back-up or non-functioning button.

To avoid problems:

• ✅ Work on a clean table with good lighting.
• ✅ Use an antistatic bracelet when working with a fee.
• ✅ Check each step on the photos taken before the disassembly.

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If the screwdriver doesn't work after assembly, take it apart again and check all the contacts, and 90 percent of the time, the problem is a poorly soldered wire or a skewed gear.

FAQ: Answers to Frequent Questions