Removal of the back cover of the Xiaomi Redmi smartphone 9T — The challenge that owners face when replacing a battery, repairing a chamber or cleaning up dust, however, the wrong actions can lead to cracks in the case, damage to plumes or loss of leakage. This instruction will help to disassemble the device without risk, using the tools at hand and proven methods.
Model Redmi 9T (The codename lime has a glue-based cap fixation, which makes it more difficult than the latches on budget phones, and it's important to consider the location of antenna lines, the fingerprint scanner and the flexible plumes. If you have never disassembled smartphones – it is better to train on an old device or contact a service center.
In this article you will find:
- 🔧 List of necessary tools (with alternatives)
- 📸 Step-by-step instructions with photo and video examples
- ⚠️ Common Mistakes and How to Avoid Them
- 🔄 Tips for reverse assembly and seal check
Preparation: tools and modalities
Before you start, make sure you have everything you need, and if you don't have at least one tool, you can damage the body or the internal components, and here's the minimum set:
- 🔨 Plastic blade (or mediator) - to separate the lid without scratches. Metal tools will leave traces!
- 🔥 Dryer or thermo-air station - for softening the glue (temperature 60-80)°C) Replacement can be made with a heating pad or hot water in the bag.
- 🧲 Suction cups (2 pcs) - help to evenly pull the lid. even suction cups for glass from the navigator will work.
- 📦 The screw container - at Redmi 9T They're few, but they're easy to lose. Use a magnetic substrate or a sticky tape.
- 🧴 Isopropyl alcohol (90%+) — Acetone or solvent will damage the plastic!
Also prepare the workplace:
- Cover the table with a soft cloth (towel, microfiber) so as not to scratch the screen.
- Make sure you have good lighting – it’s best to use a table lamp.
- Turn off your smartphone and remove it. SIM-A memory card, a battery in Redmi. 9T has no protective cover, so the risk of short circuit with careless actions is higher.
⚠️ Warning: If you have dropped your phone recently or it has been in water, disassembly can aggravate damage.
Step 1: Heating the case to soften the glue
The glue fixing the Redmi lid 9T, loses strength when heated to 60-80°C. Do not overheat the device - this may damage the battery or display:
- Turn on the dryer at average power (or set the temperature 70)°C at the thermo-air station).
- Heat the back cover in circular motions, paying attention to the edges. Keep the hair dryer at a distance of 5-7 cm.
- After 2-3 minutes, check the temperature of the body with your hand - it should be hot, but not burning.
Alternative methods of heating:
- 🔥 Wrapped phone in a towel, put the heating pad on top for 5 minutes.
- ☕ Hot water: Pour water into the bag (60–70)°C), put the phone on it for 3-4 minutes.
⚠️ Warning: Do not heat the camera and fingerprint scanner for longer than 10 seconds, as thermosensitive components are located there.
After heating, immediately start to separate the cover, and if the glue cools, you have to repeat the procedure.
☑️ Preparation for lid removal
Step 2: Separating the cover with suction cups
When the glue has softened, proceed to carefully remove the lid. Here it is important to evenly distribute the force so as not to break the latches.
- Install two suction cups on the top and bottom of the back cover (avoid the camera area).
- Pull up at the same time with moderate force. If the lid doesn't lend itself, repeat the heat.
- As soon as there is a gap (1-2 mm), insert a plastic blade into it.
- Carefully drive the blade along the edge, separating the lid, and the characteristic crackling will start to work, which is normal.
Common mistakes at this stage:
- ❌ Too much pressure on the suction cups. → cracks around the chamber.
- ❌ Use of metal tools → slashing.
- ❌ Trying to separate the cover from one side → damage to the fingerprint scanner plume.
If the lid doesn't lend itself to something, don't put too much effort into it. Go back to heating or try the other side.
What to do if the suction cups do not hold?
Step 3: Carefully remove the lid and disconnect the plumes
When the lid is 70-80% apart, don't remove it completely! 9T It's got a fingerprint scanner plume connected to it, and a sudden movement can tear the connector off.
So, act like this:
- Lift the cover to the corner 45.° and fix it in this position (for example, place the box).
- Find the scanner plume – it is located at the top under the cover (see photo below).
- Carefully unplug the connector with a plastic blade.
- Now the cover can be completely removed and put aside.
Redmi's interior design 9T post-cap:
| Component | Location. | Features |
|---|---|---|
| Battery | The bottom part | Sticked, has stretching "ears" to extract |
| Camera. | Upper left corner | Three modules (main, wide-angle, macro) |
| Fingerprint scanner | Upper centre | Connected by a flexible plume to the motherboard |
| Antenna lines | Perimeter. | Thin metal strips - do not rot! |
⚠️ Warning: If you are planning to replace your battery, don’t rush to remove it immediately. First, disconnect the battery from the motherboard (the connector is usually marked in red or orange).
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Take a picture of all the plumes and screws before you turn them off, which makes it much easier to reverse assemble.
Step 4: Cleaning and Preparing for Reverse Assembly
After removing the lid, inspect the insides for dust, moisture or damage. Cleaning is a must, especially if you have taken your phone apart due to overheating or poor camera performance.
What and how to clean:
- 🧹 Dust: Use a soft brush (for example, for lenses) or a spray of compressed air. Don't blow with your mouth - saliva can get into the contacts!
- 🩹 Glue residues: Soak the cotton swab in isopropyl alcohol and carefully remove the glue from the frame. Don't rub too hard -- you can erase the markings.
- 🔋 Battery contacts: Drain the battery connector on the motherboard with alcohol, which will improve contact and extend life.
If you notice,
- 💧 Traces of corrosion → The phone has been in contact with moisture, requires a diagnostic board.
- 🔥 Darkening near the processor → - A sign of overheating.
- 📶 Detached antenna lines → Possible problems with the signal.
You'll need a new glue to build back, and the best options are:
- 📦 Double-sided scotch 3M (0.2–0.3 mm thickness – budget decision.
- 🧴 Liquid glue. B-7000 — It is more reliable, but requires careful application.
- 🛠️ Ready-made adhesive tapes for Xiaomi - sold in spare parts stores.
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Never use superglue or Moment glue! They will damage the plastic and make the next piece impossible.
Step 5: Reverse Assembly and Testing for Leakability
Build Redmi 9T It's easier to disassemble, but there are some nuances:
- Make sure all plumes are connected (fingerprint scanner, camera, speakers).
- Put new glue on the frame of the case. If you use scotch, cut the jack holes.
- Carefully apply the lid, starting at the power and volume buttons. Press it evenly.
- Twisting the screws (if you've twisted them) in Redmi. 9T There are only 4 of them – do not confuse the length!
After assembly, check:
- 📱 Performance of the fingerprint sensor.
- 📷 Photo quality on all cameras (sometimes the plume departs during assembly).
- 🔊 Speaker and microphone sound.
- 📶 Network signal strength (if antennas are disturbed).
If something's not working:
- ❌ Fingerprint scanner: Check the plume's connection. It may have overbent.
- ❌ Camera: Turn it off and reconnect it. If it doesn't work, the problem is in the plume.
- ❌ Battery not charging: Check the connector on the board and charging cable.
⚠️ Warning: Don't turn the phone on immediately after assembly. Give the glue to hold for 10-15 minutes, especially if you've been using liquids.
Frequent problems and their solutions
Even with a careful disassembly, there can be problems, and here are the most common ways to fix them:
| Problem. | Possible cause | Decision |
|---|---|---|
| The lid doesn't fit tightly. | Insufficient glue or uneven application | Disassemble and apply the glue again using a template |
| The phone will not turn on after assembly. | Disconnected battery or plume display | Check all connectors, especially near the battery |
| There were scratches on the frame. | Use of metal tools | Cover the scratches with a metal marker or replace the frame |
| The fingerprint scanner works once in a while. | Poor plume contact or pollution | Clean the contacts with alcohol and reconnect the plume |
If the phone overheats or discharges quickly after assembly, the most likely problem is:
- 🔋 Battery: Probably damaged during retrieval. Check the voltage with a multimeter (normal: 3.7–4.2V).
- 🖥️ Thermopaste: On a Redmi processor 9T (Snapdragon 662 can dry out. Replace it with a new one (e.g., a new one, MX-4).
- 🌡️ Temperature sensor: If it detached, the phone will not properly adjust the heating.
In difficult cases (for example, if the phone is not turned on or not determined by the computer), it is better to contact the service.