How to disassemble a car charger Xiaomi: detailed instructions with photos and tips

Xiaomi car chargers are known for their quality and compactness, but even they are not immune to breakdowns. Dust, voltage changes or mechanical damage can put the device out of order. Instead of buying a new one, many users prefer to disassemble the charger for diagnosis or repair. However, improper disassembly often leads to final breakdown - so it is important to know the nuances of the design and use the right tools.

In this article, you will find a step-by-step guide with photos of key steps, a list of necessary tools, and safety tips. We will analyze typical models of Xiaomi car chargers (for example, Mi Car Charger Pro or Xiaomi 70W Fast Charge) and tell you how to avoid errors when opening the case. If your device stops charging, warms up or makes extraneous sounds, this guide will help to identify the cause.

What tools will be needed to disassemble

Before you start dismantling, prepare the workspace and tools, and without them, you risk damaging the plastic case or the chips inside, and here's the minimum set you'll need:

• 🔧 Plastic mediators or shoulder blades (2-3 (S) - for careful separation of the halves of the body without scratches.
• 🔨 Thin screwdriver with cross-tipped (PH0 or PH00) — screw-hole.
• 🧲 Magnetic substrate or bowl - so as not to lose small parts (screws, springs).
• 📸 Smartphone with camera - to fix the location of parts before disassembly.
• 🧴 Isopropyl alcohol (70%+) and cotton swabs - to clean contacts from oxidation.

If you plan to solder components (for example, replace a capacitor or resistor), additionally prepare a soldering iron with a thin sting (20-30 W), solder and flux. To diagnose malfunctions, you may need a multimeter to check the output voltage and the integrity of the chains.

⚠️ Warning: Do not use metal screwdrivers to separate plastic latches! This will lead to chips and cracks. Plastic mediators are sold in smartphone repair kits (costs from 100 rubles).

Preparation for disassembly: what to do before opening the body

Before you disassemble the charger, follow a few mandatory steps, which will save you from errors and make it easier to assemble back.

1. Turn off the charger from the mains - remove it from the lighter or outlet (if it is a universal model). 10-15 minutes if it warmed up.
2. Clean the case of dirt — wipe the charger with a dry wipe, removing dust from the connectors, this will help to avoid getting debris inside.
3. Take a picture of the device from all sides, including connectors and stickers with specifications. Some Xiaomi models have screws hidden under the sticker!
4. Check the warranty seal (if any) Disassembling the charger will automatically void the Xiaomi warranty, even if you don't break anything.

If your charger has an LED indicator, pay attention to its behavior before disassembly:

• 🟢 Green light – the device is fine, but there may be a contact problem.
• 🔴 Red light or flashing - possible malfunction of the circuit (fuse burned out, breakdown of the condenser).
• 🖤 No indication - chain break or damage to the board.

Step-by-step: how to disassemble the car charger Xiaomi

Most Xiaomi car chargers are similar in design: two plastic cases, latched or screwed, with a circuit board inside, and a general-purpose instruction for Mi Car Charger (18W/36W/70W), Xiaomi USB Car Charger and similar models.

Step 1: Removal of the upper cover

Place the charger on a flat surface with a connector USB Insert a plastic mediator into the gap between the top and bottom of the housing (usually closer to the upper part of the body). USB-Carefully drive the mediator around the perimeter, disengaging the latches. Some models have latches that are not symmetrical — don't put too much effort into not breaking the plastic.

If the body doesn't respond, it might be screwed together.

1. Turn over the charger and inspect the bottom for screws (they may be hidden under a sticker or rubber legs).
2. Remove the screws with a PH0 or PH00 screwdriver and place them in a magnetic bowl.

Step 2: Removing the printed circuit board

When you take the lid off, you'll see a circuit board attached to the bottom of the case, which is usually fixed.

• 🔩 Screws (1-2 - twist them out.
• 🧲 Double-sided Scotch – carefully tuck the charge with the mediator.
• 🔌 Latches, pull them off with a screwdriver.

Disconnect the board and look at it for blackened components, bloated capacitors, or burnt tracks. If visually all right, move on to multimeter diagnostics.

Step 3: Diagnostics and repairs

The most common malfunctions of Xiaomi car chargers:

To check the voltage at the outlet:

1. Connect the multimeter in mode DC 20V ce USB-connector (red probe — +5V, black — GND).
2. Insert the charger into the lighter or power supply 12V.
3. The correct device should show 4.8-5.2V. Deviations indicate a malfunction.

💡

If you are not sure about your rationing skills, don’t try to replace them. SMD-components (resistors, diodes) on your own. Better contact the service center or buy a new charger - the cost of repair may exceed the price of the device.

Common Mistakes in Disassembly and How to Avoid Them

Even experienced users sometimes make mistakes that lead to a charger failure, and here are the most common ones:

• 🔌 Use of metal tools to open the body → Scratches, chips, board damage. Solution: use only plastic pickers.
• 🔥 Neglect of static electricity → Solution: run on an antistatic substrate or touch a grounded object before you start.
• 📸 Absence of photos before disassembly → Solution: capture each stage on camera.
• 💧 Moisture on the board → Solution: work in a dry room, avoid alcohol on the device on.

Another common mistake is to use excessive force when disengaging the body. If the charger doesn't understand, check:

• Have you missed any hidden screws (for example, under the sticker).
• Have you confused the opening side (on some models, the latches only on one side).
• Do you use a too thick mediator (optimal thickness is 0.3-0.5 mm).

⚠️ Warning: If you find swollen capacitors or blackened resistors after disassembly, do not turn on the charger without replacing them! This can short-circuit and damage the connected device (smartphone, tablet).

How to collect the charger back: tips and check the performance

The assembly of the device should be in reverse order. Follow these recommendations to avoid problems:

1. Check the location of the parts from the photos you took earlier, make sure all latches and screws are in place.
2. Do not pull over the screws – this can lead to cracks in the plastic or damage to the board.
3. Conduct a test before final assembly: Connect the board to power 12V (Check the voltage on the USB-Make sure the indicator is on stable (without flashing).

Use heat-glue.

After assembly, test the charger in real conditions:

• 🚗 Connect it to the lighter and check the charging of the smartphone.
• 🔋 Make sure the body does not warm above 40-45°C (normality for most models).
• 📱 Check the charging speed with the Ampere (Android) or AccuBattery app.

1. Integrity of all contacts and wires.

2. Correct connection USB-connector (frequent error - inverted board).

3. no short circuits on the board (call the multimeter).-->

When repair is impractical: signs of malfunctions that should not be repaired

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

• 🔥 The controller chip (usually marked) burned MP2307, SY6288 Replacement requires professional equipment.
• 💥 The fee has split or has through burnouts - it is almost impossible to restore such damage.
• ⚡ The charger “shocks” when touched – this indicates a breakdown in the insulation, which is dangerous for life.
• 🔌 USB-connector is torn with part of the board - soldering a new connector requires accuracy and often does not justify the cost.

The cost of a new Xiaomi car charger starts from 500-1500 rubles (depending on power).If the repair requires the purchase of soldering equipment or parts for more than 50% of the price of the device, it becomes unprofitable, except for collectible or rare models (for example, Xiaomi 100W Fast Charge), where repair can be justified.

Also consider the safety factor: a faulty charger can damage the battery of your smartphone or cause a fire in your car. If you are not sure of your skills, give the device to the service center for diagnosis.

FAQ: Frequent questions about the dismantling of chargers Xiaomi