How to disassemble the charger Xiaomi Redmi Note: detailed instructions with photos and tips

The Xiaomi Redmi Note charger is a compact but complex electronic device that can eventually fail. Disassembly of the power supply is required to diagnose malfunctions (for example, if the phone does not charge, charging warms or makes extraneous sounds), replace damaged components or clean up dust. However, the internal design of Xiaomi chargers has its own features: glue joints, miniature parts and high-voltage elements that make the process of disassembly difficult for beginners.

In this article, we will discuss in detail how to carefully open the charging Redmi Note (including the Note 7/8/9/10/11 and their Pro versions), what tools you will need, and what to look for to avoid damaging the board or getting an electric shock. You will also learn which typical breakdowns can be fixed yourself, and in which cases it is better to consult a specialist.

Preparation for disassembly: tools and security measures

Before you start disassembling, make sure you have everything you need.

• 🔧 Plastic mediator or guitar mediator - for careful separation of the glued parts of the body.
• 🔨 Thin screwdriver (cross or flat, 1-2 mm) - for unscrewing screws (if any).
• 🧲 Tweezers with curved ends - for extracting small details.
• 🔌 Multimeter – to check the voltage at the output (optional, but recommended).
• 🧴 Isopropyl alcohol (90%+) — Cleaning contacts and fees.
• 📸 Smartphone with camera – to photograph the process and location of details.

Important: Don't use metal tools to open the case, they can damage the board or close contacts, and if you don't have a plastic mediator, you can replace it with an old bank card.

⚠️ Warning: Before disassembling, disconnect the charger from the socket for at least 15 minutes. The capacitors inside can retain enough charge to cause shock. Also work in a well-lit area and on a non-electrically conductive surface (for example, a wooden table).

If you're disassembling charging for the first time, we recommend watching video instructions for your model, such as YouTube for "Xiaomi Redmi Note [your model] teardown," which will help avoid errors when opening the case.

Xiaomi Redmi Note Charger Design: What’s Inside?

Xiaomi’s Redmi Note series chargers (especially the Quick Charge 3.0/4.0) have a typical build scheme, but may differ in power (10W, 18W, 33W) and number of elements.

• 🔋 Primary winding of the transformer - converts the network voltage (220V) lowly.
• 🔌 Secondary winding and rectifier - converts alternating current into direct current (5V/9V/12V).
• 🛡️ Protective elements: varistors, fuses, thermistors (protect against voltage surges).
• 📟 Charging controller – a chip that controls a process (e.g, CY77618 or SC8909).
• 🔥 Capacitors and throttles - smooth out pulsations of current.

In fast-charging models (such as the Redmi Note 10 Pro with 33W), the board is more complex: additional inductor coils and controllers are added to support Qualcomm Quick Charge or MI Fast Charge protocols.

If your charging has a non-shatterable case (e.g., cast plastic without visible seams), it is most likely not designed for repair. In such cases, it is better to buy a new device - an attempt to open can lead to irreversible damage.

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Before disassembling, take a picture of the location of all the parts and wires, this will help to properly collect the charge back, pay special attention to the polarity of the capacitors and the direction of installation of the diodes.

Step-by-step: how to disassemble the Xiaomi Redmi Note charger

The disassembly process can be divided into 3 stages: opening the case, retrieving the board and diagnostics of components.

Step 1: Separation of the hull

Most Xiaomi chargers consist of two halves of the case glued together to separate them:

1. Insert a plastic mediator into the gap between the halves of the case (usually it is on the cable side).
2. Carefully swipe the mediator around the perimeter, gradually dissociating the parts. If the body does not respond, slightly heat it with a hair dryer (no higher than 60 ° C) - the glue will become softer.
3. If there are screws inside (most often in USB Type-C models), unscrew them with a screwdriver.

Step 2: Extracting the fee

When you open the case, you'll see a board soldered to the connector contacts.

• 🔧 Unplug the wires from the board (if soldered) or gently disconnect the connector (if a plug is used).
• 📸 Take a picture of the location of the parts – it is critical for reverse assembly.
• 🧲 Tweezers remove the board from the case without touching metal parts.

Step 3: Diagnostics and repairs

You can now check the damage charge:

• 🔍 Check the safety lock (usually marked as F1 or FUSE) — If it is blackened, it must be replaced.
• 🔥 Inspect capacitors – swollen or leaky require replacement.
• 📡 Check the inductance coils for breaks or blackening.

To check the performance, use a multimeter:

• Set the diode check mode and ring diodes on the board (should show a voltage drop of ~0.5V).
• Check the resistance between + and − exit - it should be within 20-100 kΩ.

Safety check | Alcohol contacts cleared |All details in their seats |The body has no cracks-->

⚠️ Warning: If you find blackened or burned areas of the board, do not try to fix the charge yourself - this is a sign of a short circuit that may recur.

Typical malfunctions and ways to eliminate them

Most of the breakages of Xiaomi Redmi Note chargers are related to overheating, power surges or mechanical damage. Let’s take a look at the most common problems and their solutions.

1. Charging shows no signs of life (does not warm, does not glow)

Probable reasons:

• 🔌 Wire Break – Check the integrity of the cable with a multimeter.
• 🔥 Fired fuse - replace with a similar (nominal is indicated on the body).
• 📟 Faulty controller – requires flashing or replacement (difficult to do without experience).

2 Charging warms but doesn't charge the phone

This may be related to:

• 🔋 Failure of the output capacitor - check for bloating.
• 📉 Voltage drop - measure the output voltage with a multimeter (should correspond to the declared one: 5V, 9V etc.).
• 🔌 Oxidation of contacts - clean with alcohol and cotton.

3 Charging is working, but slowly

Reasons:

• 🐢 Wear of board elements - capacitors lose capacity over time.
• 🔌 Charging protocol mismatch – for example, the phone supports Quick Charge 3.0, and charging only 2.0.
• 📱 Cable problems - try another wire.

If the charging beeps or cracks when working, it is a sign of unstable transformer operation or problems with throttle, in such cases, repairs are usually unprofitable - it is cheaper to buy a new one.

How to assemble the charger back: tips and warnings

Charging assembly is as much a process as disassembly. Here are the key points:

• 🧩 Check the location of all details – use photos taken before disassembly.
• 🔧 Wrap all the screws (if any) - do not drag, so as not to damage the fee.
• 🧴 Apply a new glue (for example, B-7000) perimeter.
• 🔌 Check the operability before full assembly: connect to the network and measure the output voltage.

If the body is damaged during disassembly, you can glue it with epoxy resin or heat glue, but remember, this is a temporary solution. For long-term use, you better use the original housing.

⚠️ Warning: After assembly, do not connect the charger to the phone immediately. First check it with a multimeter or connect it to a lamp load resistor (for example, a car light bulb on the phone). 12V) — This will help to avoid damage to your smartphone in case of an error.

If the charging after assembly warms up stronger than usual, immediately turn it off - this is a sign of short circuit or improper assembly.

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The main rule of thumb when building: don’t apply excess force. Xiaomi chargers are fragile, and excessive pressure can damage tracks or components.

When repair is not advisable: signs of malfunctions that are not repaired

Not all charger breakdowns can be repaired at home, but here are the cases where repairs don't make sense:

• 🔥 Burned transformer - usually accompanied by the smell of burning and blackening of the board.
• 📟 Faulty charging controller – requires flashing or replacement of the chip (specialized equipment is needed).
• 💥 Mechanical destruction of the board - cracks, broken off sections.
• 🔋 Failure of key elements (e.g, MOSFET-Transistors – Replacing them requires precise soldering.

You should also not repair the charger if:

• Its cost is below 500-700 rubles - a new power supply will cost less.
• It has expired its service life (usually 2-3 years with intensive use).
• You are not sure about your skills – repair mistakes can lead to fire or electric shock.

In such cases, it is better to purchase the original Xiaomi charging or a certified analogue (for example, from Baseus or Anker).Using low-quality chargers can damage the phone's battery.

FAQ: Frequent questions about the disassembly of Xiaomi Redmi Note chargers