How to disassemble Xiaomi Redmi 9 yourself: detailed instructions with photos and nuances

Xiaomi Redmi 9 is one of the most popular models in the budget segment, but even it is not immune to breakdowns. Broken screen, bloated battery or broken speaker are typical problems that are most often solved by replacing parts. However, it is not always advisable to carry the device to the service center: the cost of repair can exceed half the price of the device. If you are willing to take a chance and try to disassemble the Redmi 9 yourself, this article will help you do it as safely as possible.

We'll go through the whole process, from tool preparation to reassembly, point out critical points where it's easy to make mistakes, and give you tips on how to diagnose malfunctions. It's important to understand that disassembling a smartphone takes away its warranty (if it's still valid), and doing the wrong thing can lead to a complete failure, but if you look carefully, the chances of success are high.

In this instruction you will find:

• 🔧 List of necessary tools (and what can be replaced by professional devices)
• 📱 Step-by-step with photos and explanations of each stage
• ⚠️ Typical Beginner Mistakes and How to Avoid Them
• 🔋 Tips for replacing the battery, screen and speaker
• 🔄 How to properly assemble the phone back so that there are no unnecessary screws

1. Disassembly preparation: safety tools and measures

Before you pick up a screwdriver, make sure you have everything you need. Redmi 9 is relatively simple, but without the right tools, you risk damaging plastic latches or plumes.

Here is the minimum set you will need:

• 🔩 Five-past screwdriver (size) Y000) — rear-cover
• 🔩 Cross screwdriver (PH00) — screw-on
• 📱 Plastic blades / mediators - for separation of the cover and plumes
• 🧲 Magnetic mat or container – so as not to lose screws
• 🔥 Hair dryer or thermo-air station - for softening the glue (optional, but useful)
• 📸 Smartphone for photography – fix the location of parts before taking off!

If you don't have professional tools, some can be replaced with tools at hand, such as a guitar mediator or even a plastic card (but be careful, it can break), and instead of a magnetic mat, use a piece of paper with a drawn screw layout.

⚠️ Warning: Do not use metal blades or knives to separate the lid! they will easily pierce the battery or damage the plumes. Plastic or nylon is the only safe option.

Also prepare the workplace:

• 🪑 Work at a table with good lighting.
• 🧹 Remove all unnecessary items – the lost screw can get into the mechanism of the phone.
• ⚡ Turn off your phone and wait for the battery to run out (if you plan to replace it).
• 🧤 Wear an antistatic bracelet or at least regularly touch grounded items (such as a heating battery) to remove static electricity.

💡

If you disassemble the phone because of a broken screen, stick cross-cotch tape on it - this will prevent the fragments from scattering and protect your hands.

Removal of the back cover: glue, latches and pitfalls

The back cover of Redmi 9 is attached to glue and plastic latches, and the main challenge is not to break the latches or tear the plume of the fingerprint scanner that runs under the lid.

Procedure:

1. Turn off the phone and remove the tray for SIM-cards (use a paper clip or special key).
2. Heat the hair dryer around the perimeter during 1-2 minutes (temperature) ~60°C) This will soften the glue. Don't overheat - plastic can deform!
3. Insert a plastic spatula into the gap between the lid and the case (start with the lower left corner where the tray is for the lid). SIM). Carefully drive the blade along the body, separating the latches.
4. Once the lid starts to rise, don't pull it out of the way, because there's a fingerprint scanner plume underneath, and unplug it gently by pulling the tongue.

If the lid doesn't lend itself, don't put too much effort into it. You better dryer the problem areas again, and more often than not, the problem is in the area of the camera and the top, where the glue is higher.

⚠️ Note: Some Redmi 9 versions (e.g. Redmi) 9A or Redmi 9C) The lid is attached differently, without the scanner plume, but with additional screws under plugs!

After removing the cover, you will see:

• 🔋 Battery (stick to the body)
• 📶 Antenna modules (do not touch them unnecessarily!)
• 🔊 Dynamician and microphone
• 📱 Motherboard under metal screen

3. Battery shutdown: why it's critical

Before touching any internal components, be sure to turn off the battery. Even a phone that is turned off can get a short circuit if you accidentally close the contacts on the board.

How to disconnect the battery:

1. Find the battery plume - it goes from the battery to the motherboard and is closed with a black connector.
2. Carefully put the jack on a plastic spatula, pulling up. Don't pull the wires!
3. After turning off, check with a multimeter that there is no voltage on the battery contacts (optional, but recommended).

If the battery is swelling, don't try to puncture it or bend it, it can cause fire.

• 🛑 Stop the disassembly immediately.
• 📦 Place your phone in a non-combustible container (such as a metal jar).
• 🔄 Contact the service center for safe disposal.

To replace the battery, it needs to be removed. It's glued to the body, so:

1. Put the battery on the side with a plastic spatula.
2. Carefully pull up, putting a thin plastic card under it (so as not to tear).
3. If the glue is too strong, drip a little isopropyl alcohol (90%+) under the battery, it dissolves the glue.

Disconnect the battery plume before any manipulation|Do not use metal tools near the contacts|Do not heat the battery above 60°C|Dispose of old battery in special reception points-->

4. Motherboard extraction: screws, plumes and fragile parts

The Redmi 9 motherboard is mounted on 12 different sized screws, and the key here is to remember the location of each, as tangled screws can damage the board when assembled.

Procedure:

1. Take a picture of the location of the screws or spread them out on a piece of paper according to the scheme.
2. Unscrew all the screws (start with those around the camera and charging connector).
3. Disconnect all plumes: 📷 Main camera plume 🔊 Dynamic plume 📶 The antenna module plume 🔋 The sleeve of the sleeve (unless it was previously removed)

Carefully tuck the board with a plastic spatula and lift it up. Don't pull it up hard, check if all the plumes are disconnected!

The most vulnerable components are located on the board:

• 📱 Processor (don’t touch it with your bare hands – statics can damage it)
• 📡 Module Wi-Fi/Bluetooth (cockpit)
• 🔌 The charger connector (often breaks when sloppy extraction)

⚠️ Warning: If you're disassembling your phone because of Wi-Fi or network issues, check the integrity of the little gold contacts on the board under the antenna modules.

If you need to get to a charger or speaker, you don't have to take the board out completely -- you just have to lift it up on one side, but you have to take it off completely to replace the screen or the camera.

💡

The most common mistake in retrieving the board is to forget to disconnect the vibrator plume (hidden under the battery), which causes the wire to break when the board is raised.

5. Screen replacement: difficulties and nuances

The Redmi 9 screen is one of the most expensive parts to replace, and if it crashes but the sensor works, you can do it by replacing the glass (cheaper), and if the image is missing or the sensor is not responding, you have to change the entire display module.

How to take the screen off:

1. Turn off the battery plume (if you haven’t already).
2. Heat the screen edge with a hair dryer (temperature) ~70°C. This will soften the glue.
3. Insert a plastic blade between the screen and the case and carefully lead it along, separating the display.
4. As soon as the screen starts to rise, disconnect the plumes: 📺 Display plume (wide, white) 👆 Sensor plume (thin, often black)

When installing a new screen:

• 🔧 Use new double-sided tape for fixation (old glue loses properties).
• 🧹 Make sure there is no dust or glass shards under the screen.
• 🔌 Connect the plumes only after the full screen is laid in the slots.

If the screen flashes, doesn’t turn on, or has artifacts after being replaced, check:

• 🔌 The density of the plumes fit (sometimes it helps to lightly press them).
• 🔋 Battery connection (inadequate power may cause failures).
• 📱 Screen model compatibility (on Redmi) 9 The Redmi displays are suitable 9A/9C, But there may be nuances with color rendering).

6 Replace the speaker, camera or charger connector

These components are easier to change than the screen or battery, but also require care.

Dynamics:

• 🔊 Located at the bottom of the phone, mounted on two screws.
• 🔧 Unscrew the screws, unplug the plume and remove the old speaker.
• 📦 When installing a new one, check that the speaker grille fits tightly to the body (otherwise the sound will be muffled).

Main camera:

• 📷 It is mounted on one plume and two screws under a metal plate.
• ⚠️ Do not touch the lens – greasy traces will worsen the quality of the photo.
• 🔄 If the camera doesn’t work after the replacement, check the settings. → System system → Reset → Resetting camera settings.

Charging connector (Type-C):

• 🔌 Located on a separate board soldered to the mother.
• 🔧 To replace you need to solder off the old connector and solder a new one (a soldering station is required).
• 💡 If there is no soldering experience, it is better to take the phone to the service - improper soldering can disable the power controller.

After replacing any component, check it to make it work before it is fully assembled, for example, if you change the speaker, turn on the music; if the camera, take a test shot.

7. Build a phone: how not to forget anything important

Putting Redmi 9 back together is often harder than disassembling. The main rule is: go backwards and check every step.

Checklist for assembly:

Connect all plumes (display, camera, battery)|Make sure the screws are screwed into the same holes|Check the density of the screen and cover|Turn on the phone and test all the functions-->

Typical errors in assembly:

• 🔩 Extra screws - if after the assembly there are "extra", then something is not twisted (most often forget the screw under the antenna module).
• 📶 Poor antenna connection – leads to weak network signal or Wi-Fi.
• 🔊 Clutched speaker plume – the sound will be hoarse or absent.
• 🔋 Unconnected battery – the phone will not turn on, but it can warm up.

After assembly:

1. Turn on your phone and check: 📵 Network signal and Wi-Fi 🔊 Sound in the speaker and microphone 📷 Operating the cameras 🔋 Charging (connect the charger) 👆 Sensor and display

plume-line

⚠️ Warning: If the phone overheats or discharges quickly after assembly, chances are you have damaged the battery or power controller.Switch it off immediately and check the circuit with a multimeter.

8.Diagnostics of malfunctions: what to do if something goes wrong

If after disassembly or assembly the phone is not working correctly, here is the diagnostic algorithm:

If you can’t determine the cause of the malfunction, use Xiaomi’s test modes:

1. Enter the dialer code: ##4636##
2. Choose Equipment Testing.
3. Check all modules (screen, camera, speaker, etc.).

If the problem is software (for example, after changing the screen, the phone is glitchy), reset to factory settings:

1. Go to Settings → About the phone → Reset settings.
2. Choose to erase all data.
3. After resetting, the phone should work stably.

When buying, pay attention to the compatibility with the model (Redmi 9, 9A and 9C spare parts!).