Disassembly Xiaomi Mi 9 Lite: a complete guide with photos and repair tips

Xiaomi Mi 9 Lite (codenamed pyxis) is a popular mid-range smartphone released in 2019. Despite the years since, the device is still in demand due to its balanced characteristics: Snapdragon 710 processor, triple camera 48 MP and AMOLED-But like any technique, it needs repair over time, whether it's replacing the battery, cleaning up the dust, or recovering from a fall.

The Mi 9 Lite has its own features: a fragile plume of the fingerprint scanner under the screen, a glue display module and a compact layout of internal components. In this article, you will find step-by-step instructions with the photo, a list of necessary tools, as well as critical warnings about typical errors that lead to the device failure.

Important: If you've never disassembled a smartphone before, make a sober assessment of your strength. Mi 9 Lite errors can result not only in loss of warranty (if it's still valid), but also damage to the motherboard or display. In some cases, the cost of repairs after a failed disassembly exceeds the price of the device itself in the secondary market.

Preparation for disassembly: tools and security measures

Before you start, make sure you have everything you need. Xiaomi Mi 9 Lite is not one of the most difficult to disassemble smartphones, but will require accuracy and specialized devices.

• 🔧 Plastic mediators (2-3 - to separate the back cover and display. Metal tools can scratch the body.
• 🔥 Dryer or thermostation (power from 800 W) - for softening the glue. Optimal temperature: 70-85°C.
• ⚡ Suction cup (5-7 cm diameter) – helps to raise the screen after heating.
• 🔩 Screwdriver. T3 and T5 — for the midframe and motherboard fastening screws.
• 🧲 Magnetic mat or organizer - so as not to lose small details (screws, washers).
• 📱 Tweezers with curved ends - to disconnect the plumes.
• 🔋 Multimeter (optional) – to check the battery voltage before disconnecting.

Also, prepare your workspace: a table with good lighting, an antistatic mat (or at least a wooden surface), and a spare battery in case the original one rises or gets damaged. Don't disassemble your smartphone on a carpet or soft surface - static electricity and loss of screws are guaranteed.

⚠️ Warning: If your Mi 9 Lite was in water or was subjected to severe vibration (for example, after a fall), disassembly can be dangerous! a bloated battery or corrosion on the board can lead to fire or short circuit.

Before starting work, it is mandatory to:

1. Turn off your smartphone and remove it. SIM-map.
2. Discharge the battery to 20-30% – this will reduce the risk of fire in case of accidental damage.
3. Make a backup of the data (via Settings) → Additionally. → Backup).
4. Take a picture. IMEI (on a box or under the battery) - useful for recovery after repair.

Removal of the back cover: nuances and typical mistakes

The back cover of the Mi 9 Lite is attached to the glue and latches around the perimeter. Unlike Xiaomi's flagship models, there are no screws here - this makes it easier to do, but requires caution when heated. Overheating can deform the plastic or damage the adhesive layer, which will subsequently lead to detachment of the cover.

Step-by-step:

1. Heat. Turn on the dryer at medium power (70-80)°C) and warm the back cover evenly for 2-3 minutes, paying special attention to the corners. Keep the hair dryer at a distance of 5-7 cm, so as not to melt the plastic.
2. Separation. Place the suction cup closer to the bottom edge (where the Type-C connector is located) and pull up slightly. Once the gap appears, insert a plastic mediator into it.
3. Perimeter pass. Carefully drive the mediator along the edge, separating the latches. Don't put too much effort into it -- if the lid doesn't lend itself, warm it up again.
4. Remove. Once all latches are removed, remove the lid. Be careful, it has a fingerprint scanner glued to it (if your model is equipped with one).

Common mistakes at this stage:

• 🔥 Overheating. Temperatures above 90.°C can damage the battery or display.
• 🔪 They're using metal tools, they scratch the body and they can close the contacts.
• ⚡ This often causes the fingerprint scanner plume to break.

After removing the cover, you will see:

• Battery with plug-in.
• A motherboard closed with a metal screen.
• Camera plumes and fingerprint scanner.
• Dynamic and vibration motor.

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If you're disassembling a smartphone to replace the battery, you can stop at this point. Disconnect the battery connector and remove it with a plastic mediator. Don't use metal tools, the risk of battery puncture is high!

Battery shutdown and midframe dismantling

Before further disassembly, be sure to turn off the battery, which will prevent short circuits and damage to the motherboard, and the battery connector is located next to the main camera and is usually marked in red or orange.

How to turn off the battery:

1. Carefully tuck the connector with a plastic spatula or tweezers.
2. Lift it up, don't pull it aside - it can damage the contacts.
3. Secure the connector with tape to the case so that it does not touch the board.

⚠️ Warning: If the battery is blown up (as seen by the bulge of the lid or the characteristic "slapping" sound when pressed), do not try to remove it yourself. Bloated Li-ion batteries are extremely dangerous - they can ignite or explode when mechanically exposed. In such cases, contact the service!

Once the power is out, you can start removing the middle frame. It's mounted on 10 screws (T3 and T5) And a few latches:

1. Twisted all the screws, starting with the corner screws, and put them on the magnetic mat in order of extraction.
2. Carefully tuck the frame with a plastic mediator on the side of the volume buttons. It holds on the latches, so don't pull too much.
3. Disconnect the plume of the power button (it is attached to the frame) and the plume of the vibration motor.

You'll find it under the frame:

• 📷 Main camera (48 MP) + 8 MP + 2 MPs).
• 🔊 Speaker and microphone (located at the bottom of the microphone).
• 📡 Antenna modules (thin metal plates on the sides).

Extracting the motherboard: order and precautions

The Mi 9 Lite motherboard is the most valuable and vulnerable component, and damage to it often makes repairs economically inefficient. Before you extract the board, take a picture of all the plumes and connectors, which will help with the reverse assembly.

Step-by-step:

1. Disconnect all plumes: 📱 Display plume (the widest, at the top of the board). 📷 Main and front camera plumes. 🔋 Charging connector plume (Type-C). 🎤 Microphone plume and dynamics.

Unscrew all the screws of the board mounting (usually 8-10 pieces, T3). Please note: some screws may be of different lengths!

Carefully tuck the board with a plastic spatula on the side of the Type-C connector. It should come out effortlessly.

Typical problems in collecting fees:

• 🔌 Contacts interrupted due to excessive effort in disconnecting plumes.
• ⚡ Static electricity can damage memory chips or processors. Always touch a grounded object before work.
• 🔧 Loss of screws – some board mounts are of non-standard length, so entanglement will lead to damage to the body.

Battery's off.|The location of the plumes is photographed|The screws are stacked in order|The working surface is grounded.|Tools are not metal.-->

After you have paid the fee, you can:

• Testing it for performance with the help of USB-Post-Card or Debugging (for professionals).
• Clean dust with a soft brush and isopropyl alcohol (at least 90%).
• Replace damaged components (e.g., a charging controller or audio codec).

⚠️ Warning: If you notice dark spots, corrosion or swollen capacitors on the board, these are signs of moisture or overheating. In such cases, self-repairing can aggravate the problem. BGA-chip.

Replacement of the display: difficulties and life hacks

Mi 9 Lite Display is One of the Most Vulnerable. AMOLED-The sensor is pressure sensitive, and the plume of the fingerprint scanner under the screen often breaks off when you disassemble it carelessly. If you change the display because of cracks or broken pixels, please note: the new module must be original or from a proven manufacturer (for example, Tianma or a new one). BOE). Cheap Chinese copies often have color rendering and sensor issues.

How to replace the display:

1. Heat. Warm up the screen with a hair dryer (70-80)°C) perimeter, paying attention to angles.
2. Separation. Use a suction cup and plastic mediators. Start at the bottom edge (where the Type-C connector is located).
3. Disconnect the plumes. Carefully disable: Display plume (wide, top), sensor plume (thin, next to the display), fingerprint scanner plume (if present).

Installation of a new display.

double-sided 3M scotch

UV-glue

Life hacks to replace the display:

• 🔍 Check before assembly. Connect the new display to the board and turn on the smartphone (hold the power button for 10-15 seconds). Make sure there are no broken pixels and the sensor is working.
• 🧴 Use of glue. If you use it. UV-glue, apply it in a thin layer and dry under an ultraviolet lamp for at least 5 minutes.
• 🔧 Sensor calibration: After the display is replaced, the sensor may need to be calibrated via the engineering menu (##6484##).

1. Correct connection of all plumes.

2. the integrity of the contacts on the motherboard (possibly they were bent).

3. Power supply (connect the charger - the indicator should light up).-->

Build a smartphone: reverse order and testing

The Xiaomi Mi 9 Lite should be assembled in reverse order, but with a few key points in mind:

1. Plugs. Last thing you need to do is plug them in so you don't damage the board. Start with the shortest one (fingerprint scanner), then display and touch.
2. Screw them cross-twisted to avoid skewing the board. Don't pull them over, it could damage the thread.
3. Battery: Check its voltage with a multimeter before connecting (should be 3.7-4.2 V). If below 3.5 V, charge it with an external device.
4. Rear cover. Clean it and the body of dust before you stick it. Use a new adhesive layer (e.g. Tesa 61395).

After assembly, be sure to conduct testing:

• 🔋 Charge. Connect the charger and check if the current is coming (the indicator should appear).
• 📶 Put the network in. SIM-map and check the signal, calls, internet.
• 📷 Take a photo on the main and front cameras, check autofocus.
• 🔊 Sound. Test the speaker, the microphone and the vibration.
• 👆 Sensor, check the response to touches all over the screen, and the fingerprint scanner.

If something's not working:

• 🔌 No charge? Check the Type-C plume and the contacts on the board. They may have curled up when assembled.
• 📵 No network? Make sure the antenna plumes are connected correctly and are not damaged.
• 🖥️ Check the display plume and the contacts on the board. Reheating may be required.

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If the smartphone overheats or discharges quickly after assembly, the most likely problem is the wrong installation of the battery or heat pads. Take the device apart and check if they are deformed.

Mi 9 Lite Failures and How to Avoid Them

Xiaomi Mi 9 Lite has several “weak points”, the knowledge of which will help prevent breakdowns during disassembly:

If you are facing one of these problems, here is what you can do:

• The fingerprint scanner plume is broken, most of the time, the plume or the entire display module needs to be replaced, and self-repair is possible only with soldering equipment.
• If the smartphone is turned on, but not all functions are working (for example, no sound or the camera is not working), contact the service for diagnostics of chips.
• Sensor problems. Try reconnecting the plume or updating the firmware. If it doesn't work, you need to change the display.

FAQ: Answers to Frequent Questions