Xiaomi Mi Wireless Charging Pad 20W (MDY-11-ES) is a popular device among smartphone owners Xiaomi, Redmi and other brands with support for the Qi standard. Over time, even the most reliable device can fail: stop holding the charge, warm up or not turn on at all. In most cases, the problem lies in dust on the coils, oxidized contacts or damaged cable – and all this can be fixed on your own.
However, disassembling wireless charging requires care: there are fragile elements inside, and improper handling of the board can lead to final failure.This article will help you to disassemble the Xiaomi 20W without risk, using improvised tools and minimal skills. We will consider not only the dismantling process, but also typical malfunctions that can be diagnosed visually.
⚠️ Warning: Disassembly of the device will void the warranty Xiaomi. If your charging is still warranty service, contact the service center. Also remember that working with electronics requires compliance with safety precautions - disconnect the device from the network before starting disassembly.
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Preparation for disassembly: tools and precautions
Before you start, make sure you have everything you need. The Xiaomi Mi Wireless Charging Pad 20W doesn't need professional tools to disassemble, just what you'll find in every home. Here's the minimum set:
- 🔧 Plastic blade or mediator - for careful slashing of the body (metal screwdrivers can leave scratches).
- 🔨 Cross screwdriver (PH0 or PH1) — screw-off.
- 🧲 Magnet or screw container – to avoid losing small details.
- 📸 Smartphone for photography – capture each step so as not to confuse the order of the assembly.
- 🧴 Isopropyl alcohol (70%+) and cotton swabs - for cleaning contacts and boards.
Also prepare the workplace: a table with good lighting, no carpeting (so as not to lose screws) and with a minimum number of foreign objects. Turn off the charging from the socket 10-15 minutes before disassembly, this will discharge the capacitors and avoid the risk of electric shock.
⚠️ Note: If your Xiaomi charging has visible damage to the case (cracks, chips) or traces of fluid intake, disassembly can be dangerous.In such cases, it is better to consult a specialist - a short circuit on a damaged board can disable connected devices.
Step 1: Removal of the top charging cap
The Xiaomi Mi Wireless Charging Pad 20W has two parts: the top panel with the logo and the bottom stand, connected by latches, so you can't force it. Start by flipping the charging and inspecting the seam around the perimeter, which is usually covered with rubber legs.
Take a plastic blade and gently insert it into the gap between the top and bottom of the body, starting at one of the corners. Gradually push the blade along the seam, lifting the lid. If you feel resistance, don't push harder, you'd better move to another area. Generally, the latches are closer to the center, so start at the edges.
✅ Sign of successful withdrawal: The top panel will separate with a characteristic click, but will remain connected to the board through a plume.Don't pull it sharply - there may be a thin flexible cable inside connecting the charging indicator to the main board.
Try another angle |High the body with a hairdryer (not higher than 50°C) |Use a thinner blade |Check if there are any hidden screws-->
Step 2: Disconnect the indicator plume and inspect the insides
Once you remove the top cover, you'll see a flexible plume that connects the LED light to the main board, which you have to detach to completely separate the parts of the case, and usually the connector is fixed with a small latch — gently tuck it in with a nail or a plastic blade and pull out the plume.
Now you can look inside the charging, and inside you'll find:
- 📶 Coil wireless charging - a round element with a winding responsible for energy transfer.
- 🔌 Control board with chip, capacitors and connector for power cable.
- 🔋 Thermopaste or heat pad – can be applied to a chip to remove heat.
- 🛡️ Metal screen – protects the board from electromagnetic interference.
If you want to clean the dust, you'll focus on the coil and the board. The dust on the coil reduces the efficiency of charging, and on the board can cause overheating. To clean, use a cotton swab dipped in isopropyl alcohol, it will remove the dirt and leave no stains.
What to do if there are traces of oxidation on the board?
Step 3: Dismantling the board and coils - when necessary
If the problem is deeper (for example, the indication does not work or the charging does not supply power), you will need to remove the control board.
- Unscrew 4 screws that fix the board (usually they are located in the corners).
- Carefully raise the fee - it can be glued to the body with a heat pad.
- Disconnect the coil connector (if it is removable) or inspect the soldering of contacts.
The wireless charging coil in Xiaomi 20W is usually soldered to the board, but sometimes attached through a connector. If you notice darkening or bloating of the capacitors, this is a clear sign of malfunction. Also check the integrity of the tracks on the board - they may be damaged due to overheating.
⚠️ Note: If you have no experience with a soldering iron, do not try to sell the elements on the board yourself. Incorrect soldering can lead to a short circuit and final failure of the device.
| Malfunction | Appearances | Possible cause | Recommendations |
|---|---|---|---|
| Charging is off. | The indicator is not on, there is no reaction to the connection | Cable damaged, fuse burned, fee malfunctioned | Check the cable, inspect the charge for burned items |
| Slow charging. | The phone charges longer than usual | Dust on the coil, contact oxidation, chip malfunction | Clean the coil and board, check the connection of the coil with the board |
| Overheating charging | The body is very hot, the smell of burning is possible. | Short circuit, capacitor failure, poor heat sink | Disconnect immediately from the network, inspect the charge for damage |
| Blinking indicator | LED flashes or burns unstablely | Poor contact of the indicator plume, faulty chip | Check the connection of the plume, clear the contacts |
Step 4: Diagnose and address typical problems
By disassembling the charging, you can fix a number of faults yourself, and here are the most common ones and how to solve them:
- 🔌 Damaged power cable: If charging doesn't turn on, check the cable. connect another device to that cable - if it doesn't work, the problem is with it. 20W standardized USB-C, So it's not difficult to replace it.
- 🧹 Coil pollution: Dust and metal particles on the coil reduce the efficiency of charging. Clean it with a soft brush and alcohol. Do not use abrasive materials!
- 🔥 Bloated capacitors: If the board has convex capacitors with a convex top, they need to be replaced. This is a task for an experienced amateur radio operator - without soldering skills, it is better to contact the service.
- 🔄 Poor contact of the coil: Check whether the coil wires are soldered or connected to the board. If the contact is weakened, it can be soldered (if you have experience).
If the charging still doesn’t work after cleaning and inspection, the problem may lie in the control chip, in which case it will cost more to buy a new charge, so evaluate the feasibility of further actions.
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Before assembling the device, check the operability of the board by connecting it to a power source (for example, through USB-If the indicator lights up, the board is good, and the problem may be in the coil or the housing.
Step 5: Building Charging – How to Avoid Errors
The assembly of the device is carried out in reverse order, but there are nuances:
- Make sure all plumes and connectors are tightly connected – even a small backlash can cause inoperability.
- When installing the board, do not tug the screws - this can damage tracks or capacitors.
- Before final assembly, check that there are no extra screws or parts - a screw forgotten inside the case can close the board.
- Install the top cover, starting from the corner where the latch of the indicator plume is located.
Once built, connect the charger to the network and check it. If the indicator is on and the smartphone starts charging, congratulations, the repair was successful! If not, double-check all connections and check the charge for damage that may have occurred during the assembly.
⚠️ Attention: If after assembly the charging is unstable (it turns on, turns off), most likely the problem is poor contact of the coil with the board.
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The most common build error is the wrong connection of the indicator plume. If the LED does not burn after assembly, but the charging is working, check this connector first.
When the Disassembly Will Not Help: Alternative Solutions
Not all Xiaomi Mi Wireless Charging Pad 20W malfunctions can be fixed on your own, here are the cases when it is best to contact the service or consider buying a new charger:
- 💥 Burned control chip: If the board is visible blackened areas or burnt paths, repair will cost expensive.
- 🔋 Coil Failed: Replacing the coil requires precise soldering and matching a similar piece.
- ⚡ Short circuit: If charging sparks or smokes when connected, its continued use is dangerous.
- 🛠️ The connector is damaged. USB-C: Replacement of the connector is possible, but requires accuracy and special equipment.
The cost of the new Xiaomi Mi Wireless Charging Pad 20W is about 1500-20000 rubles (2026), so before a complex repair, assess how justified it is. If you still decide to buy a new charge, pay attention to models with a built-in fan (for example, Xiaomi Mi Turbo Wireless Charging Pad) – they are less warm and longer last.