Xiaomi Redmi 9A is one of the most popular budget models of the brand, but even such a simple device sometimes requires disassembly. The reasons can be different from replacing the battery to cleaning the connectors or repairing after a fall. However, removing the back cover is a process that contains many pitfalls. Wrong actions lead to broken latches, damaged plumes or even a cracked body.
In this article, you will find detailed instructions tailored to the design of the Redmi 9A, a list of tools you need, and unique tips that are not in standard manuals. We will also take a look at common beginner mistakes and explain how to avoid costly repairs. If you have never taken your smartphone apart before, this material will help you get it right the first time.
⚠️ Warning: Disassembling the phone will void Xiaomi warranty. If your device is still warranty service, contact the service center. Self-repair can lead to permanent damage to the board due to static electricity or improper handling of plumes.
Why you should open the Redmi 9A
Owners of Xiaomi Redmi 9A are most often faced with the need to disassemble in the following cases:
- 🔋 Battery replacement: Lithium polymer batteries degrade over time: after 1.5-2 years, capacity drops by 30-40%, the phone quickly discharges or suddenly turns off. The official replacement in the service costs 2–3 thousand rubles, while the independent installation of a new battery costs 2-3 times cheaper.
- 📶 Clean connectors. Dust, moisture, or oxidation of the contacts cause problems with charging, speaker or antenna. 9A Poor network catch or only charges in a certain position of the cable, the reason is often a contaminated USB-Type C connector.
- 💥 Repair after a fall, impacts can damage the mountings of the cover, disconnect the plumes of the camera or display, in such cases, disassembly is necessary for diagnosis.
- 🔧 Modding: Some users install additional modules (e.g, NFC-chip) or modify the cooling system.
A less obvious reason is a checkup, and even if the phone is working normally, it could have accumulated dust or fibers from pockets that over time lead to overheating or corrosion of the contacts.
⚠️ Attention: If your Redmi is 9A You're in the water, don't disassemble it right away. First, turn off the device, wet the surface, and put the phone in a silica gel bag for 24 to 48 hours!
Disassembly tools: what really needs
There are often lists of 10 to 15 items on the Internet, but in practice, the Redmi 9A has a minimum set of tools, not just the number of tools.
| Tool. | Appointment | Where to Buy/Alternative |
|---|---|---|
| Plastic spatula (suction cup + mediator) | The lid is removed from the body without scratches, and the metal tools leave traces. | Smartphone repair kit (AliExpress, Chip and Deep) Alternative: guitar mediator. |
| Cross screwdriver PH00 | Important: Don't confuse it with PH0 or PH1! | Electronics stores or laptop kits. Don't use cheap kits, they're ripping off the slates. |
| Tweezers with curved ends | Careful disconnection of plumes and rearrangement of small parts. | Pharmacy (surgical tweezers) or radio parts store. |
| Thermistol or hair dryer (not necessary) | You only need to soften the glue around the perimeter of the lid if the phone hasn't been cleared before. | Building dryer (60-80°C) Alternative: hot water or hot water in the bag. |
| Antistatic bracelet | Protecting the board from static electricity, critical if you're working on a carpet or in a dry room. | Electronics stores. Alternative: periodically touch a metal object (heating batteries). |
🔹 What you don't need to buy:
- ❌ Metal blades – scratch the body and can damage plumes.
- ❌ Powerful hair dryer (over 100)°C) – melt plastic or damage the screen.
- ❌ A glue sealant for reassembly - in Redmi 9A Original two-way tapes are used, which are sold in remakes.
Read more: 5 Steps That 90% of Newcomers Miss
Before you start, do these things, and they'll save you time and nerves.
Turn off the phone and remove it. SIM-map + memory-card
Take a picture of the back cover (useful for the correct installation of the latches)
Prepare a clean, well-lit workplace (it is better to cover the table with white cloth)
Charge your phone at least 30% (in case of diagnosis after disassembly)
Wear an antistatic bracelet or periodically discharge statics-->
🔹 Why can't you take your phone apart in the kitchen or in the bathroom? Humidity and fatty fumes settle on the board, which can lead to corrosion of contacts. The ideal place is a table in a dry room with good lighting.
🔹 Secret Lifehack: If you don't have an antistatic bracelet, wrap your wrist with foil and ground it by touching the heating battery, which will reduce the risk of damage to the chips by static discharge.
⚠️ Attention: If your Redmi is 9A I've been in repairs before, and there might be some surprises inside, like propellers that are out of the box, broken latches, or mislaid plumes!
How to Open the Redmi 9A Cover
Now, to the most critical stage, follow the instructions in strict order to avoid damaging the device.
Step 1: Heat the case (if the lid has never been opened)
The glue that Xiaomi uses to fix the lid loses strength when heated to 60-70 ° C. Use a dryer at minimum power or place the phone in a warm water bag (not boiling water!) for 2-3 minutes. The main thing is not to overheat! It is enough to make the case warm to the touch.
Step 2: Separation of the suction lid
Apply a suction cup to the bottom of the lid (near the USB-Type C connector). Pull up carefully, creating a small gap. Put a plastic blade in the slot and slowly lead it along the body, snapping the locks. Don't put too much effort — if the lid doesn't lend itself, warm it up again.
What to do if the suction cup does not hold?
Step 3: Carefully remove the cover
Once all the latches around the perimeter are snapped, don't rush to remove the lid completely. It's connected to the body with two plumes:
Fingerprint scanner (if your model is equipped with one).
- Antenna plume (thin black wire).
Carefully lift the lid and unplug the plumes with tweezers. Don't pull the wires - they're fragile!
📌 Important: At Redmi 9A The fingerprint scanner plume is not attached by a connector, but by glue. Don't try to tear it off, you better gently shovel it with a spatula.
Step 4: Fixing the lid after disassembly
If you plan to assemble the phone back, use new two-way tapes (sold in Redmi 9A remakes). Old glue loses its properties after the first separation. Stick tapes around the perimeter of the case, then gently press the lid, starting at the top (where the camera is located).
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Before final assembly, check all buttons and connectors, and sometimes the volume button stops working after disassembly due to a misaligned plume.
Common Mistakes and How to Avoid Them
Even experienced craftsmen sometimes make mistakes when disassembling the Redmi 9A. Here are the most common of them and ways to prevent them:
- 🔨 The screws are ripped off, the reason is the wrong screwdriver or the excessive force. Solution: use the screwdriver. PH00 with a magnetic tip and do not press too hard.
- 🔥 Display plume damage, cause: abrupt opening of the lid without disconnecting the plumes Solution: Always check if the plumes are connected to the motherboard.
- 💔 Reason: Attempt to open the case from the wrong side (e.g., near the camera module). Solution: Start from the bottom edge, where the USB-Type C port is located.
- ⚡ Short circuit. Reason: touching the board with your bare hands in a dry room. Solution: use an antistatic bracelet or periodically discharge statics.
🔹 The Hidden Problem: At Redmi 9A The battery plume is very short. If you disconnect the battery completely and then try to turn the phone on for a check, the plume may break. Always plug the battery in before testing!
⚠️ Warning: If the phone doesn't turn on after assembly, but when you connect to charging, the battery icon shows up, it's a problem with the power plume, it's easy to damage if you disassemble it in a careless manner. ~500 rubles).
What to do after a successful disassembly
Congratulations! you have successfully opened the lid of the Xiaomi Redmi 9A. Now it is important to finish the process correctly:
- Diagnostics. Check the purpose of the disassembly: if you change the battery, charge the phone and make sure it holds a charge; if you clean the connectors, test the charging and operation of the speakers.
- Clean. Remove dust from the motherboard with a brush (not a metal one!) or a spray of compressed air. Don't use wet wipes!
- Assembling. Set the lid in place, starting at the top. Make sure all the latches are in place (you should hear the slight clicks).
- Test: Turn on your phone and check all the functions: camera, speaker, sensors, buttons.
🔹 Expert advice: If you've been cleaning a USB-Type C connector, put a thin layer of technical vaseline on your contacts before assembly, which will protect them from oxidation and improve contact with the cable.
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If the phone overheats after assembly, you probably forgot to connect the antenna plume or misplaced the thermal paste (in models with a Helio G25 processor).