Disassembly of the ceiling lamp Xiaomi: from fasteners to electronics

Why to disassemble the Xiaomi ceiling light and when it is necessary

Xiaomi ceiling fixtures, from budget Yeelight models to premium Mi LED Ceiling Light Pros, are notorious for reliability, but even they require maintenance.

First, to clean the internals, dust and insects accumulate over time on radiators and drivers, which leads to overheating and flickering; second, to replace LED modules, they become dim or fail over time; and finally, disassembly is necessary when upgrading, installing additional sensors (such as the Xiaomi Aqara) or switching to more powerful drivers.

It is important to understand that disassembling the light fixture will void the manufacturer’s warranty if it is still valid, but for models older than 2 years (the term of the standard Xiaomi warranty), this is the only way to bring the device back to life without buying a new one.

Preparation for disassembly: tools and security measures

Before you start, make sure you have everything you need, and the minimum set of tools includes:

• 🔧 Screwdriver with a set of bits (cross, flat, Torx) T5-T10 — model)
• 🧲 Magnetic holder for screws (so as not to lose small details)
• 🔌 Voltage tester or indicator screwdriver (to check the power outage)
• 📸 Smartphone for photographing the dismantling stages (useful when assembly)
• 🧴 Alcohol and cotton swabs to clean contacts

Pay special attention to safety:

⚠️ Attention: Even if you turn off the machine on the shield, Xiaomi lights can have capacitors that retain charge for up to 5 minutes.

We recommend that you work in rubber gloves and on a non-conductive surface (such as a wooden table).If the lamp is connected via Wi-Fi (like Yeelight Pro), pre-disconnect it from the network in the Mi Home app, this will eliminate accidental switching on during disassembly.

Step 1: Remove the lamp from the ceiling

Start by turning off the power on the shield. Make sure the light switch is also in the OFF position.

1. Remove the decorative plafond. Most Xiaomi models have it mounted on the latches. Carefully place it with a flat screwdriver around the perimeter, starting at any angle. For threaded models (such as the Mi LED Ceiling Light 650), turn the plafond counterclockwise.
2. Unscrew the fixing screws that hold the base of the lamp. Usually, 3-4 of them are hidden under the ceiling. In models with magnetic mounting (like Yeelight Moon>), you just need to pull the base down.
3. Put the light down, but don't disconnect the wires! First take a picture of them connecting or mark L (phase), N (zero) and PE (ground) with paint tape.

If the wires are rigidly fixed in the terminal, use a thin screwdriver to loosen the clamps. Don't pull the wires - this can damage the contacts on the driver board.

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If the light is heavy (e.g., Mi LED Ceiling Light Pro weighs ~3 kg), ask the assistant to support it while unscrewing the screws.

Step 2: Disassembly of the case and access to electronics

After being removed from the ceiling, spread the lamp on a flat surface. Most Xiaomi models have two body parts:

1. External radiator (aluminum or plastic) - removes heat from the LEDs.
2. Internal unit with power driver and control board (in smart models).

To separate them:

• 🔍 Find hidden latches around the perimeter of the case. In Yeelight models, they are often located under rubber plugs.
• 🔧 Unscrew the screws that attach the radiator to the inner unit. LED Ceiling Light 450 is hidden under a sticker with a serial number.
• 📱 If the lamp is smart, disconnect the antenna. Wi-Fi/Bluetooth (black wire from the control board.

Be careful with the heatpaste between the radiator and the LED board. It can be sticky -- don't smear it on the components. If the paste is dry, it will need to be replaced when assembled.

Power's off the shield.|The wire connection is photographed|Removed decorative plafond|The hull attachment screws are unscrewed|Antenna disconnected (for smart models)-->

Internal Component Analysis: What You Can Fix Yourself

Once you open the case, you'll see a few key elements, and their condition will help diagnose the problem:

The most common problem is driver failure. Xiaomi luminaires often use Mean Well or Injoinic drivers. Their catalog numbers can be found on the part body. For example, for Mi LED Ceiling Light 650, the IPQ-120-36 driver is suitable.

⚠️ Note: If there is a chip on the control board ESP8266 or ESP32, Don't touch its conclusions without an antistatic bracelet. Static electricity can damage the chip, and the lamp will lose its smart control function.

Typical problems and ways to fix them

Let’s look at the most common problems and what to do with them:

1. The lamp flashes or spontaneously turns off

The cause is usually poor contact or overheating.

• 🔌 Condition of terminals - oxidized contacts clean with sandpaper.
• 🌡️ Radiator temperature – if it is hot, replace the thermopaste (Arctic) MX-4 fit).
• 💡 LED integrity – the burned diode can be replaced by soldering a new one (2835 or 5050, depending on the model).

2. Smart control does not work (Wi-Fi/Bluetooth)

For models with Mi Home or Yeelight App support:

• 📶 Check the antenna – it should be tightly connected to the connector U.FL board-board.
• 🔄 Reset settings by holding the button on the board for 10 seconds (until the indicator flashes).
• 🖥️ Fly the module through USB-TTL Adapter if the lamp is not detected on the network.

3. The lamp does not turn on at all.

Diagnostic sequence:

1. Check for 220V at the driver input (with the switch on).
2. Measure the driver output voltage – if it is not, replace the driver.
3. Call the circuit from the driver to the LED board - a cliff indicates damage to the wire.

If all components are in good working order, but the fixture is not working, the problem may be a short circuit on the board, in which case a visual inspection under the magnifying glass will be required for microcracks or burnt tracks.

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90% of Xiaomi lighting problems are solved by changing the driver or soldering LEDs; only 10% require a deep diagnostic of electronics.

Assembly and performance check

Collect the lamp in reverse sequence, following the photos taken earlier.

• 🔧 Tightening of screws - do not pull, so as not to tear the thread in the plastic case.
• 🧲 Connecting wires – phase (L) must go to the corresponding driver terminal (usually marked with red).
• 📶 The position of the antenna – in smart models, it should be pointed down for a better signal.

After assembly:

1. Connect the light to the network and check the basic functionality (on/off switch).
2. For smart models, connect to it through the Mi Home app and check all the features (brightness adjustment, color temperature).
3. Leave the lamp on for 1-2 hours, periodically checking the temperature of the case. Normal - up to 50 ° C on the radiator.

⚠️ Warning: If the lamp starts to buzz after assembly, this is a sign of resonance in the driver. Try to loosen the screws of the driver attachment to the body a little bit - this often eliminates vibration.

FAQ: Frequent questions about dismantling of Xiaomi lamps