Why the Redmi 9C is being dismantled and what you need to know in advance
Xiaomi Redmi 9C (codenamed angelica) is a 2020 budget model that is still popular today for its balanced specs and affordable price. However, like any gadget, it is not immune to breakdowns: battery failure, speaker problems, cracked camera glass or the need to replace the charging plume. In 70% of cases, repairs are cheaper than buying a new phone, but require careful disassembly.
This guide will help you disassemble the Redmi 9C without damage, even if you're doing it for the first time. We've taken into account all the pitfalls of the model: the brittle latches of the back cover, the battery glued and the location of the plumes. Importantly, disassembly is not warranty if it's still valid. Check this in the Settings menu → About phone → Warranty status.
Before you start, assess your strength. If the phone does not turn on after a fall, perhaps the motherboard is damaged, in this case, it is better to contact the service. But replace the battery, speaker or camera really yourself, saving 1,500-3,000 rubles.
Preparation: tools and security
The Redmi 9C will require:
- 🔧 Plastic mediator (or guitar) to unplug the lid. Metal tools scratch the body!
- 🔨 The screwdriver (PH00 or PH0) — There are 12 screws in the phone, different sizes.
- 🔋 Suction - helps to lift the cover, but not necessarily.
- 🧲 Magnetic mat or container – to avoid losing screws (they are easy to confuse!).
- 🔥 Hair dryer or thermoplatform - to soften battery adhesive (temperature 60-80)°C).
- 🧴 Isopropyl alcohol (90%+) — Cleaning contacts and removing glue residues.
⚠️ Warning: Do not use a knife or screwdriver to lash the lid - this will lead to chipped plastic. 9C fastened on latches and bilateral tape, not on glue, but with careless removal breaks.
Work on a clean desk with good lighting. Turn off the phone and extract SIM-If the battery is swelling, don't try to pierce it! Wrap the phone in foil and take it to the service - the risk of fire is high.
Removing the back cover: a step-by-step process
The most important step is that the lid is held on 8 latches around the perimeter. If you break it, the new case will cost 800-1 200 rubles.
- Heat the edges of the phone with a hair dryer (1-2 minutes) or put it on a warm battery. This will soften the scotch.
- Insert the mediator in the gap between the lid and the frame on the side of the USB-C connector (there are no plumes there). Carefully drive the tool along the body, snapping the mounts.
- When the lid starts to move, don't pull it out, because there's a fingerprint scanner plume underneath, and unplug it with a flat screwdriver.
If the lid doesn't lend itself, warm it up again. Don't force it, Redmi 9C plastic is thinner than flagships and cracks under pressure.
☑️ Checklist before lid removal
Battery Disconnection: How Not to Burn Your Phone
The battery in the Redmi 9C is glued to the body and connected to the board by two connectors: the main (power) and the additional (thermistor), which must be turned off in a strict order, otherwise a voltage surge is possible:
- Remove the metal battery protection (holds on 4 screws).
- Disconnect the additional connector (it is thinner and located above the main one).
- Only then turn off the main power connector.
To remove the battery:
- 🔥 Warm it with a hair dryer (not higher than 80).°C! 3-5 minutes.
- 🧹 Poke a plastic mediator from any angle and slowly pull up.
- 🧴 Clean the body from glue residues with alcohol.
⚠️ Attention: If the battery is swelling, do not try to pull it out by force - it can burst. In this case, it is better to use a special suction cup for the battery or contact the service.
| Action. | Risk | How to avoid |
|---|---|---|
| Disconnecting connectors in the wrong order | Short circuit on board | First, an extra jack, then the main one. |
| Use of metal tools for smacking of AKB | Battery puncture, fire. | Only plastic mediator + warming up |
| Strong pressure on the cover when removed | Plastic cracks, latch breaks. | Warming + careful management of the mediator |
Extraction of motherboard and other components
After removing the battery, you can start dismantling the board. In Redmi 9C, it is mounted on 8 screws (of different lengths!) and connected to the body with 5 plumes:
- 📱 Main display plume (the widest).
- 🔊 Dynamics and microphone plume.
- 📷 Main and front camera plumes.
- 👆 Fingerprint sensor plume (unless disconnected earlier).
Procedure:
- So, put them all together, and they are all different.
- Carefully tuck the board from the edge with the mediator. Don't pull it sharply, the display plume is fragile.
- Disconnect all connectors in turn, remembering their location.
If you want to replace a speaker, a vibrator, or a charging connector, they're attached separately from the board, USB-The port is held on 2 screws and connected to the board with a flexible plume. When replacing, make sure that the new connector is original - Chinese counterparts often do not support fast charging.
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Before assembly, take a picture of the location of the plumes and screws - this will save time and prevent errors.
Common Mistakes and How to Avoid Them
Even experienced craftsmen sometimes make mistakes when disassembling the Redmi 9C. Here are the most common:
- 🔌 Display plume damage when the board is not removed carefully. How to avoid: disconnect it last, preheated by a hairdryer.
- 🔋 Battery thermistor break when forced to disconnect connector. How to avoid: use plastic tweezers.
- 🔧 Confused screws when assembled. How to avoid: spread them out in groups (for example, on a marked magnetic mat).
- 📱 Avoiding dust from the camera or sensors after disassembly: work in a clean room and cover the exposed components with a napkin.
Another common problem is that the phone doesn't turn on after assembly.
- Unconnected battery plume or display.
- Short circuit due to metal shavings from screws (check the board with a magnifying glass!).
- Damaged charging connector (call the multimeter).
⚠️ Warning: If the phone warms up after assembly, turn it off immediately! This is a sign of short circuit. Take it apart again and check all the connectors.
What to do if the latch of the cover is broken?
Building a phone: reverse order and testing
Collect Redmi 9C in reverse order, but with nuances in mind:
- Make sure all the plumes are connected before the board is laid – then it will be difficult to reach them.
- Twisting the screws cross-cross so that the boards are flat.
- Before installing the battery, clean the contacts with alcohol - oxidation can cause charging problems.
- Warm up the double-sided tape on the lid with a hairdryer (30 seconds) so that it sticks better.
After assembly:
- 🔋 Connect the charger and check if the current is coming (the indicator should catch fire).
- 📱 Turn on your phone and test the sensor, cameras, speaker and microphone.
- 📡 Check the network and Wi-Fi – sometimes after disassembly, the antenna plume leaves.
If something's not working, don't panic. Take the phone apart again and check:
- Are all the plumes connected (especially the display and battery)?
- Whether there is a cable somewhere (for example, under the charge).
- Have you forgotten to install metal screen protections (they are necessary for the normal operation of antennas!).
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The basic rule of assembly is that if something doesn't fit in without effort, you forgot to disconnect the plume or you didn't install the component correctly. Don't push it, figure out the reason!