How to disassemble car charging for Xiaomi phone: detailed instructions with photos and expert tips

Xiaomi car chargers are some of the most popular smartphone accessories due to their combination of compactness, power and affordable price. However, over time, even the most reliable devices fail: the connector stops fixing, the case warms up or contact disappears. Most of the time, the problem is solved by simply cleaning or replacing damaged elements, but you need to carefully disassemble the charging without damaging the internal components.

If you've never done electronics repair, the process can seem complicated.In fact, disassembling Xiaomi's car charging (whether it's the Mi Car Charger model on the phone) 18W, 30W or 100W) It's all about knowing the mounting points of the body, understanding where the latches are, and using the right tools. In this article, we will analyze the process Step-by-step, taking into account the characteristics of different generations of charging, and also tell you how to avoid typical errors that lead to the final breakdown of the device.

⚠️ Warning: Disassembling the charger deprives you of warranty (if it is still valid) and can lead to loss of performance if you mishandle the charge or contacts. If you are not sure about your skills, you should contact the service center.

1.Preparation: security tools and measures

Before you start disassembling, make sure you have everything you need. Most Xiaomi car charging systems are assembled without screws – the body is glued together or fixed with latches, so the main tool is a plastic transmitter (or a special blade for disassembling gadgets).

• 🔧 Thin screwdriver (cross or flat, depending on the model).
• 🧲 Magnetic mat or tray for small details.
• 🔍 Lupa (to inspect soldered contacts).
• 🧴 Isopropyl alcohol (for cleaning contacts).
• 📸 Smartphone (to photograph the process – this will help with reverse assembly).

Important: Never use metal tools to disengage the body - they can scratch plastic or close contacts on the board. If the latches are too tight, it is better to heat the case with a hairdryer (temperature not above 60).°C) to make the glue softer.

Also prepare the workplace: the desk should be clean, without dust and moisture. Xiaomi often uses in its charging. USB-C or USB-A connectors with fragile contacts - they are easy to bend or tear off with careless movement.

Determination of type of shell: gluing vs. latching

Xiaomi car charging is divided into two types according to the way the body is assembled:

1. Glued body (typical for budget models, for example, Mi Car Charger) 18W). Here, the halves of the body are connected using glue, and for disassembly you will need to carefully tuck the seam with a mediator.
2. Latched case (found in more powerful chargers, for example, Mi Car Charger) 100W). Here you need to find the fixation points and sequentially crack them, so as not to break the plastic protrusions.

To understand what type of body your charger has, look at the seam between the halves, if it's flat and there's no visible slits, it's probably glued together, if you notice small ridges or connector lines, it's latches.

⚠️ Note: If your charging has a built-in cable (e.g. models with a USB-C → Lightning), disassembly becomes more complicated - the cable is often soldered to the board, and its break will lead to the inoperability of the device.

3. Step-by-step disassembly: from theory to practice

Let’s look at the Mi Car Charger model. 30W (If you have a different charge, the principles will be the same, but the number of latches and their location may differ.

Turn off the charger from the lighter and phone

Take a picture of the body from all sides.

Prepare the tools (mediator, screwdriver, mat)

Wear an antistatic bracelet (optional)-->

Step 1. Separation of the top cover

Insert a plastic mediator in the seam between the top and bottom of the case (start with the corner where the case is located). USB-Carefully drive the mediator along the seam, listening to the clicks of the snapping locks. Don't use excessive force - if the body does not respond, then you missed the latch.

Step 2: Extracting the fee

Once the body is disconnected, you'll see an internal board attached to the bottom half, which is usually fixed:

• 🔩 Screws (in models with metal radiator, for example, Mi Car Charger) 100W).
• 🧩 Plastic latches (in budget charging).
• 🔥 Heat glue (rarely found, but possible in older models).

If the board is fixed with screws, twist them with a screwdriver. If you have latches, carefully tuck the board with a mediator on the opposite side of the connector.

Step 3: Inspection and diagnosis

Now you have the charger board in your hands.

• 🔌 Contacts USB-Ports – often oxidized or contaminated.
• 🔥 Traces of burns on resistors or capacitors (indicate overheating).
• 🔋 Bloated capacitors (sign of failure).
• 🧲 soldering joints - can depart under mechanical loads.

Typical malfunctions and their elimination

In 80% of cases, Xiaomi car charging breaks down for three reasons: contact contamination, soldering joints break down, or board components fail, and we'll look at each problem and how to solve it.

1. Pollution USB-port

Dust, moisture and oxidation are the main enemies of all connectors. If the charging does not hold the phone or periodically shuts down, first of all, clean the contacts:

• 🧼 Wipe. USB-port with cotton swab dipped in isopropyl alcohol.
• 🔍 Check the contacts on the board – if they are blackened, gently clean with a blower or special contact fluid.
• 🔌 Check if the pins are bent in the connector (especially relevant for the USB-C).

Breakdown of soldering joints

If the charging stopped working after a fall or a severe shaking, probably one of the contacts broke off. 30W) And solder:

1. Find the cliff (usually the wires coming from the USB-port-to-board).
2. Clear the contacts and apply a little flux.
3. Carefully solder the wire back without overheating the fee.

⚠️ Warning: If you've never soldered, it's best not to risk it - improper soldering can damage the tracks on the board.

3. Failure of the payment elements

If the charging does not show signs of life (does not warm, does not light up the indicator), the problem may be:

• 🔋 Capacitors – If they are swelled, they need to be replaced.
• 🔥 Resistors or diodes – check for multimeter integrity.
• 🔌 Safety: In some models, it is located near the entrance. 12V.

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If you can't find a charging circuit, take a picture of the board on both sides and look for similar images online from the model. Often, enthusiasts post disassemblies with the elements marked.

5. Charging Assembly: How to Avoid Errors

Collecting the charge back is often harder than disassembling it — especially if you haven't photographed the process.

1. Checking the fixation of the fee

Make sure the board fits tightly to the body and doesn't hang around. If your model had screws, twist them with a cross screwdriver, but don't pull them over, you can rip the thread.

Coaxiality of halves of the shell

Before the final snap, check that:

• 🔌 USB-The port is not skewed and freely enters the hole.
• 📏 The edges of the body match without gaps.
• 🔋 The indicator (if any) is not covered with plastic.

3. Test before final assembly

Before you finally snap the case, connect the charger to the lighter and check:

• 🔋 Does the indicator burn (if provided).
• 📱 Does the phone determine charging (a notification should appear about the start of charging).
• 🔥 Is the body warmed beyond normal (light heat is permissible, but not burning).

If everything works, gently snap the case. If the charging isn't working, take it apart again and check:

• 🔌 Quality of contacts USB-port-to-port.
• 🔋 The correctness of the wire connection (if they were sold off).
• 🔍 Integrity of tracks on the board (may be a microcrack).

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If the charger works after assembly, but the phone charges slowly, check the cable - often the problem lies in it, not in the adapter itself.

Models with wireless charging: features of disassembly

Xiaomi’s wireless charging car (such as the Mi Wireless Car Charger) is particularly challenging because of the following:

• 🧲 Inductance coils (responsible for energy transfer).
• 🔧 Mechanisms of fixing the phone (springs or clamps).
• 🔋 Additional control board (controls the position of the device).

Key differences in disassembly:

1. The body is almost always glued together, and it will require heating with a hairdryer to open it.
2. The coil is glued to the upper cover - it must be torn off carefully so as not to damage the wires.
3. Inside, there may be a micro-switch that fires when you place your phone — it’s easy to break.

⚠️ Note: Xiaomi wireless charging often uses double-sided scotch 3M When you break it down, you'd better replace it with a new one, because the old one loses its stickiness.

If you are disassembling the Mi Wireless Car Charger to repair the coil, keep in mind that replacing it requires precise soldering – the slightest shift will lead to weak contact and slow charging.

7 When repairs are impractical: signs of hopeless breakdown

Not all Xiaomi car charger breakdowns are repairable at home, and here are the best times to buy a new device:

• 🔥 The board burned - if it shows black traces of burns or melted elements, the recovery will cost more than a new charge.
• 💥 Short circuit - if when connected to the cigarette lighter, the fuse in the car knocks out.
• 🔌 Tap. USB-port from the board - for soldering a new connector you need micro soldering skills.
• 🧲 Coil damage in wireless models – replacing costs 70-80% of the cost of new charging.

Also consider the cost of parts. USB-C port 100W It could cost half the price of a new device, and in such cases, it's not economically feasible to repair it.

If you decide to throw away charging, do not forget about the environment: hand it over to the electronics reception point - the boards contain precious metals that can be recycled.

FAQ: Frequent questions about the dismantling of charges Xiaomi