Disassembly of the Xiaomi charger: instructions for models 5V, 18W, 33W and 67W

Why do you need to take out Xiaomi charging?

Xiaomi chargers are known for their reliability, but even they are not immune to breakdowns. Over time, power supplies begin to warm up, make extraneous sounds or completely stop charging the devices. In most cases, the cause is failure of the capacitors, fuse burnout or damage. USB-Disassembling the charger will help diagnose the problem and possibly restore it to work without buying a new device.

However, not all breakdowns are repairable at home, for example, if the controller chip is burned or the transformer winding is damaged, it is more rational to buy a new charge - the cost of components and the risk of soldering errors make repairs unprofitable. In this article, we will discuss only those cases where disassembly is justified: replacement. USB-port, contact check, dust cleaning or diagnosis of simple malfunctions.

Before you start, consider that disassembling the charger deprives you of warranty (if it is still valid) and can be dangerous if you do not comply with safety precautions. Inside the unit there are elements that accumulate charge even after disconnection from the network!

What tools will you need?

Xiaomi doesn't need professional tools to disassemble charging, but it doesn't need a minimum set.

• 🔧 A flat screwdriver (preferably with a thin sting - suitable for cracking the latches of the body).
• 🔨 Plastic mediator or guitar mediator (for careful separation of halves of the body without scratches).
• 🧲 Magnetic screwdriver or tweezers (so as not to lose small screws).
• 🔍 loope USB-microscope (to inspect boards for microcracks or burnt-out elements).
• 📏 Plastic card (alternative to the mediator for disengagement of the body).

If you plan not only to disassemble, but also to repair the charging, additionally prepare:

• 🔥 soldering iron (power 30-40 W with a thin sting).
• 🧵 Solder and flux (for soldering contacts).
• 🔋 Multimeter (to check the voltage at the output).
• 🧴 Isopropyl alcohol (to clean the board from dust and oxides).

⚠️ Warning: Do not use metal tools to separate the case - they can close contacts on the board and disable the charging permanently.

Preparation for disassembly: security measures

Disassembling the charger is a process that requires caution, and even after disconnecting from the grid, the capacitors can retain a charge that can shock. To avoid injury and damage to the equipment, follow the rules:

1. Turn off the charge at least 10-15 minutes before disassembly, which will reduce the residual charge of the capacitors.
2. Work on a dry surface, preferably on a wooden or plastic table (not a metal one).
3. Do not touch the board with your bare hands - use gloves or hold on to the edges of the case.
4. Avoid static electricity: touch an earthed object (such as a heating battery) before work.

If you've never dealt with electronics, you might want to just look at the external charger, for example, often the problem is a damaged cable or a contaminated cable. USB-And the port, you can clean them without being completely dismantled:

• 🔌 Wipe the USB-Type C or Micro-USB port with a cotton swab soaked in alcohol.
• 🔍 Check the cable for any clutter or melted areas.

⚠️ Warning: If the charging case is swelling, melting, or smelling like a burn, don't disassemble it yourself, symptoms that indicate a short circuit or overheating that could cause a fire.

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Before disassembling, take a photo of the charging case from all sides - this will help to properly collect it back, especially if there are hidden latches inside.

Step-by-step: how to disassemble Xiaomi charging

The disassembly process depends on the charger model, and we'll look at the three most common types: compact units. 5V/2Ah, quick chargers (18W) and powerful adapters 33Watt/67Watts for laptops. The general principle is the same, but there are nuances.

1. Disassembly of standard charging 5V/2A (models) MDY-05-EM, MDY-08-EM)

These chargers have a single plastic case glued together to separate it.

Shut off the network for 15 minutes|

Prepare a plastic mediator|

Heat the body with a hair dryer (optional)|

Mark the location of the latches-->

1. Find the seam on the body, which usually runs around the perimeter in the middle, insert the mediator into the seam, and carefully guide along until the body begins to diverge.
2. Click the latches. There may be plastic latches inside, so don't break them, or the case won't come back together.
3. Remove the board. It can be glued to one of the halves -- put a screwdriver on it, but don't put too much effort into it.

Inside you'll see:

• 🔌 USB-port (often soldered to the charge).
• 🔋 Capacitors (blown or blackened - a sign of malfunction).
• 🔥 Safety (small black cylinder with inscription) 250V 1A or similar).

2. disassembly of 18W charging (Quick Charge, models) MDY-12-EU, MDY-12-ES)

These units are more powerful, so their body is often fixed not only with glue, but also with screws.

1. Find the screws under the sticker or rubber legs (if any) and carefully remove the sticker by using a knife.
2. Turn the screws around with a cross screwdriver, sometimes hidden under a warranty seal.
3. Disconnect the body with a mediator, starting from the place where there are no connectors.

Inside you will find a more complex fee with:

• 🔄 Transformer (large black part with winding).
• 🔌 USB-Type C port (can be on a separate board).
• 🔋 Several capacitors and diodes.

⚠️ Attention: Quick Charge charges use high-capacity capacitors. Don't touch the board unless you're sure there's no residual charge - use the multimeter to check the voltage.

3. Disassembly of powerful charges 33Watt/67Wh (models) MDY-16-EU, AD65)

These adapters have a metal body, which makes it difficult to disassemble.

1. Then, the top of the lid is removed, with a screwdriver on its four sides (it is held on the latches).
2. Unscrew the screws that fix the board to the aluminum radiator.
3. Carefully remove the board without damaging the heat paste on the radiator.

Features of such charges:

• 🔥 Two transformers (to support high power).
• 🔌 USB-Type C port with additional contacts for data transfer.
• 🔋 Large number of capacitors and protected chips.

Diagnosis of malfunctions: what to pay attention to?

After dismantling, check the charge for visible damage, and here are the most common causes of breakdowns:

If you find a bloated capacitor, you need to replace it.

1. Drink out the faulty capacitor by heating it on both sides.
2. Install a new capacitor of the same capacity and voltage (parameters are indicated on the case).
3. Seal contacts, avoiding overheating fees.

If the problem is USB-The port, you can replace it in its entirety:

1. Seal off the old port by heating all contacts at the same time.
2. Install a new port by combining contacts with the tracks on the board.
3. Seal the port and check the multimeter for no circuits.

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If you're not sure about your soldering skills, you should go to a service center. Bad soldering can lead to short circuits and fire!

Charging assembly after repair

After the fault is corrected, you need to properly collect the charge back.

1. Check the location of all the details - the fee should lie flat, without distortions.
2. Then, put them in the sleeve or put them in the sleeve.
3. Connect the halves of the body, starting from the side opposite the connector, and the latches should stand in place with a slight click.
4. Check charging with a multimeter before first turning on: 🔌 Connect the probes to the probes. + and-- contacts USB-port. 🔋 The tension must be 5V ± 0.2B (for standard charges) or 9V/12B (for Quick Charge).

If the charging does not work after assembly:

• 🔍 Check if you forgot to connect any connector inside the case.
• 🔌 Make sure all screws are twisted – sometimes they close the contacts.
• 🔥 If you smell a burn, immediately turn off the charger and disassemble it again.

⚠️ Warning: After repair, do not leave the charger unattended during the first use, observe it for 10-15 minutes to make sure that there is no overheating or sparkling.

When is repair not appropriate?

Not all breakdowns can be repaired at home, but here are some of the best times to buy a new charger:

• 🔥 The controller chip burned down – its replacement requires professional equipment.
• 🔌 The transformer winding is damaged - repairs will cost more than a new charging.
• 💥 The case is swelled or melted - this is a sign of a short circuit, dangerous for safety.
• 🔋 Charging over 5 years old – even after repair, its efficiency will be low, and the risk of re-breaking is high.

The cost of new charges Xiaomi starts from 300–500 ruble (for models) 5V/2A and before 1500–2000 roubles 67If the repair requires the purchase of parts or tools in excess of 50% The cost of a new charger is unjustified.

Please note that after the self-repair:

• 📉 Reliability decreases - soldering at home is less durable than factory.
• ⚡ Short circuit risk increases if contacts are poorly isolated.
• 🔄 The warranty is cancelled (if it is still in effect).

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If you frequently experience charge breakdowns, consider buying a device with a 2 warranty.+ year or model with removable cable (for example, Xiaomi) ZMI This will make it easier to replace damaged items.

FAQ: Frequent questions about the dismantling of charges Xiaomi