Disassembly of Xiaomi Redmi Note 9: step-by-step guide with photos and tips

Xiaomi Redmi Note 9 is one of the most popular smartphones in the budget segment, but even it is not immune to breakdowns. Is your screen cracked after a fall? Is the battery swollen and the case bent? Or just want to clean your device from dust? In any case, disassembling the phone is a task that you can handle on your own if you act carefully and follow proven instructions.

In this article you will find step-by-step analysis of the process with photographs of key stages, a list of necessary tools and unique tips for working with fragile elements Redmi Note 9, which are not in standard manuals. We will also tell you what mistakes beginners most often make and how to avoid them so as not to turn the repair into an expensive board replacement.

We warn you in advance: disassembling the smartphone voids the warranty, if it is still in effect. If you are not confident in your abilities, it is better to contact a service center. But if you decide to act on your own, let's start with preparation.

Preparing for Disassembly: Tools and Safety Precautions

Before you grab a screwdriver, make sure you have everything you need. Redmi Note 9 - not the most difficult smartphone to disassemble, but without the right tools you risk damaging the plastic latches or cables.

Here minimum setwhich you will need:

• 🔧 Plastic spatulas (2-3 pcs.) - for carefully prying off the lid and cables. Metal tools may scratch the casing.
• 🔩 Phillips screwdriver PH00 - for back cover screws. Regular PH0 will not work as the screws are very small.
• 🧲 Magnetic mat or a container for screws - so as not to lose small parts. B Redmi Note 9 there are about 15 of them.
• 🔥 Hair dryer or hot air station - to soften the glue under the battery. Even a household hair dryer at maximum power will do.
• 📱 Sucker - will help you remove the screen if you need to replace it. Diameter at least 5 cm.
• 🛠️ Tweezers - for working with cables and small parts.

Also prepare your workplace: it should be well lit, without drafts (dust can get inside the case) and with sufficient space for laying out parts. Place white paper or a napkin on the table - even the smallest screws will be visible on it.

⚠️ Attention: if the battery Redmi Note 9 swollen, disassembling the phone at home is dangerous! Lithium batteries may catch fire if damaged. In this case, it is better to turn to professionals.

Removing the back cover: secrets and pitfalls

Back cover Redmi Note 9 It is attached with latches and glue, so removing it without damage is a whole science. Let's start with the fact that a hairdryer is required here: Without heating, the plastic may crack if you try to pry it off with a spatula.

Step by step instructions:

1. Turn off your phone and remove the SIM card tray.
2. Heat the perimeter edges of the back cover with a hairdryer for 2-3 minutes. Keep the hairdryer at a distance of 10-15 cm so as not to melt the plastic.
3. Insert a plastic spatula into the gap between the cover and the body at the charging connector. Carefully move it along the edge, one by one releasing the latches.
4. When the cover begins to come off, do not pull it sharply - the fingerprint scanner cables and antenna contacts pass under it.

If the lid does not budge, do not use excessive force. It’s better to warm up the problem area again. IN Redmi Note 9 It is especially difficult to unlatch the corners near the camera - the latches are the tightest there.

Is the plastic heated around the entire perimeter?|Are you using a plastic spatula rather than a metal one?|Are there any loose cables under the cover?|Are all the screws in place (have you lost any)?-->

After removing the cover, you will see the battery, motherboard and several cables. Do not touch the board with bare hands - Static electricity can damage microcircuits. If you need to touch, first touch a grounded metal object (such as a radiator).

Removing the battery: how to avoid starting a fire

Battery in Redmi Note 9 It is glued to the body with double-sided tape, and its removal is the most critical step. If you do it incorrectly, you can break the battery, which will lead to short circuit or fire.

Here's how to do it safely:

1. Disconnect the battery cable from the motherboard (it is located under the black protective film). Use a plastic spatula to carefully pry up the connector.
2. Heat the battery with a hair dryer from the back side (through the back cover) for 3-5 minutes. The glue will become softer and the battery will come off easier.
3. Use a plastic spatula to pry the battery from the side (not from the end!) and slowly pull it up. If you feel resistance, warm it up some more.
4. If there are pieces of glue left under the battery, remove them with alcohol or acetone, but do not scratch the case.

⚠️ Attention: If the battery is swollen, do not pierce or bend it under any circumstances! Lithium-ion batteries release toxic gases when damaged and may explode. In this case, it is better not to risk it and take the phone to a service center.

After removing the battery, inspect it for damage. If the battery is deformed, it cannot be installed back - only for replacement. Also check the contacts on the board: oxidation or contamination can cause poor charging.

What to do if the battery is glued too tightly?

If the battery does not come off even after heating, try using thread for removing batteries (sold in electronics stores). Slide it under the battery and carefully “saw” the glue back and forth. Do not use metal objects - they may puncture the battery!

Disassembling the screen: when you can’t do without a suction cup

Screen Redmi Note 9 - one of the most vulnerable parts of the phone. If it is cracked or no longer responds to touch, it will most likely need to be replaced. But to get to the display, you must first remove the front panel, which is attached with glue and latches.

Algorithm of actions:

• 🔥 Heat the screen with a hairdryer around the perimeter (especially near the buttons and speaker). The temperature should be around 60-70°C - if you overheat, you can damage the LCD matrix.
• 🧲 Place the suction cup closer to the bottom edge of the screen (where the charging connector is). Gently pull up and a gap should appear.
• 🛠️ Insert a plastic spatula into the gap and slowly move it along the edge, snapping the latches. Be careful around the sensor cable - it breaks easily!
• 📱 When the screen comes off, do not remove it completely - it is connected to the board with a flexible cable. Carefully disconnect the connector (it is secured with a latch).

If the screen does not come off, do not force it - you may damage the touch layer. It’s better to warm up the problem area again. IN Redmi Note 9 Most often, the latches “stick” in the upper part, next to the front camera.

After removing the screen, you will see a metal frame with a motherboard. Here you will need a Phillips screwdriver to unscrew the screws and get to the remaining components (speaker, cameras, vibration motor).

Working with the motherboard: what you can and cannot touch

Motherboard Redmi Note 9 - this is the “brain” of the phone, and any careless movement can disable it. If you have reached this stage, it means that you need to replace some component (for example, the charging connector) or clean the board from dust.

Basic rules:

• 🔌 Disconnect all cables before removing the board. They are fragile and easily break if moved carelessly.
• 🔍 Take pictures of the screw locations - they are different lengths, and if you mix them up, you can damage the board.
• 🧹 To clean, use a soft brush and alcohol. Do not blow on the board with your mouth - saliva contains acids that will corrode the contacts over time.
• 🔥 Do not overheat the board with a hairdryer — the maximum temperature for soldering components should not exceed 300°C.

If you need to replace e.g. charging connector, proceed like this:

1. Unsolder the old connector using a soldering station (power no more than 40 W).
2. Clean solder pads using braid.
3. Install the new connector, aligning it with the holes on the board.
4. Solder the pins without overheating the board. Use water-based flux.

If you have never soldered microcircuits, it is better not to risk it - Redmi Note 9 has a multi-layer board, and one wrong move can damage the tracks. In this case, contact a specialist.

Component	Difficulty of replacement	Required Tools	Time (approx.)
Battery	Average	Hair dryer, plastic spatula, tweezers	20-30 min
Screen (display + sensor)	High	Hairdryer, suction cup, spatulas, screwdriver	40-60 min
Charging connector	Very high	Soldering station, flux, tweezers	60+ min
Rear camera	Low	Screwdriver, tweezers	10-15 min
Speaker	Low	Screwdriver, glue	15 min

Assembling a phone: how not to forget a single detail

Collect Redmi Note 9 back is often more difficult than taking it apart. The main rule is work in reverse order and check every step. Here are some tips to help avoid mistakes:

• 📸 Check the photos, which were done during disassembly. This is especially true for the location of cables and screws.
• 🔩 Tighten the screws in a crisscross patternto avoid board distortions. Do not use excessive force; the threads in the housing may break.
• 🔋 Before installing the battery Check that there is no debris or glue residue underneath. Otherwise, the battery may become deformed.
• 📱 Test your phone after each assembly step. For example, after connecting the screen, check whether it responds to touches.

Pay special attention plumes: They should be connected tightly, but without kinks. If the phone does not turn on after assembly, check:

• Is the battery connected (sometimes the cable falls out of the connector).
• Are the contacts on the board shorted (inspect for foreign objects).
• Is the power button installed correctly (if it was removed).

⚠️ Attention: If after assembly the phone heats up more than usual, most likely you forgot to apply thermal paste to the processor or did not secure the heatsink correctly. Disassemble the device and check the cooling system.

When the phone is assembled, turn it on and check all the functions: camera, speakers, sensor, charging. If everything works, congratulations, you did it! If not, don’t panic, most likely a contact has come loose somewhere. Disassemble the phone again and check all connections.

Common mistakes and how to avoid them

Even experienced craftsmen sometimes make mistakes when disassembling Redmi Note 9. We have collected TOP-5 most common problems and ways to prevent them:

1. Broken back cover latches. The reason is the use of metal tools or excessive force. Always heat plastic and use only plastic spatulas.
2. Torn screen cable. Most often this happens when the display is suddenly removed. Disconnect the cable only after the latches are completely unlatched.
3. Lost screws. B Redmi Note 9 there are many of them, and they are of different lengths. Use a magnetic mat or container with cells.
4. Overheating of the board during soldering. If you are replacing the charging connector, do not hold the soldering iron in one place for more than 3-5 seconds. Use a heat sink (eg tweezers).
5. Dust getting under the screen. Disassemble the phone in a clean room and do not blow on the parts. Dust under the sensor will be irritating when used.

If you do break something, don't despair. Many details Redmi Note 9 You can buy on AliExpress or at local service centers. The main thing is not to try to fix something you are not sure about. For example, if the phone does not turn on after replacing the screen, the problem may be damaged motherboard, and here professional diagnostics will be required.

And remember: in 80% of cases, breakdowns during self-disassembly occur due to haste. Take your time, take breaks and check each step again.

FAQ: answers to popular questions

Is it possible to disassemble Redmi Note 9 without a hair dryer?

Technically yes, but the risk of damaging plastic latches or cables increases significantly. A hair dryer softens the glue and makes the plastic more elastic. If you don't have a hairdryer, you can use hot water in a bag (apply to the lid for 1-2 minutes), but this is less reliable.

How much does it cost to disassemble Redmi Note 9 at a service center?

The cost depends on the type of work:

• Diagnostics - 500-1000 rubles.
• Screen replacement - 2000-4000 rubles. (excluding cost of spare parts).
• Battery replacement - 1000-1500 rubles.
• Dust cleaning - 800-1200 rubles.

Disassembling it yourself will be cheaper, but only if you already have the tools.

What should I do if the phone does not turn on after disassembling?

Check the following:

1. Is the battery connected (sometimes the cable falls out of the connector).
2. Are the contacts on the board shorted (inspect for debris or solder drops).
3. Is the power button installed correctly (if it was removed).
4. Have you damaged the screen cable or motherboard?

If all else fails, the firmware may have been reset. Try going to Fastboot (press Power + Volume down) and reflash the phone.

What glue should I use for the battery after replacement?

Best fit double-sided tape 3M 9448A or its analogues. It is quite sticky, but at the same time allows you to remove the battery during the next repair. Do not use superglue or hot melt glue - they may damage the case.

Is it possible to replace only the screen glass and not the entire display?

Technically it's possible, but it's very complex and risky procedure. The glass is glued to the sensor layer and matrix, and when separated, they are easily damaged. In 90% of cases it is cheaper and more reliable to replace the entire screen module.