Why Redmi 9 owners want to take the lid off – and when it really needs to be
The back cover of the Xiaomi Redmi 9 is not mounted on screws, but on a perimeter-latched adhesive basis. This makes it difficult to disassemble, but makes the case thinner and easier. Most users try to open it for three reasons: replacing the battery (5020 mAh capacity degrades in 2-3 years), cleaning dust (especially important for charging connectors), or repairing the display plume after a fall.
But it's not always worth disassembling. For example, if the phone just gets slower, the problem is more software -- try resetting to factory settings through Settings → About Phone → Reset. But if the Redmi 9 doesn't hold a charge (discharges in 2-3 hours), warms up when charging, or gives an error "Battery is not supported" -- you can't do without opening. It's important to understand: the glue on the Redmi 9 cover is disposible -- after removing it you have to glue it again or use bilateral tape.
Another nuance: Redmi models 9A, 9C and 9T structurally identical, but the 9T added NFC-If you're going through this version, be careful about the thin plume of the antenna, which breaks easily when you're not a good cub.
What tools are needed and what can not replace professional equipment
To safely remove the Redmi 9 cover, you will need:
- 🔧 Plastic spatula (or mediator) – metal tools leave scratches on plastic.
- 🔥 A hair dryer or a thermo-air station (from 800 watts) is for softening the glue. A household hair dryer is fine, but you'll have to heat it up longer.
- 🧲 Suction cup (3-5 cm diameter) - helps to separate the lid after heating.
- 📦 Thin Torx screwdriver T3 — squirt SIM-cards (if any) if installed).
- 🧴 Isopropyl alcohol (90%+) — acetone or solvent cannot be used to clean glue residues!
A common mistake for beginners is to try to open the lid without heating by simply putting on a blade. This leads to cracks in plastic or latches. The glue on Redmi 9 melts at ~60-70°C, so warming up is mandatory. If you don't have a hair dryer, you can use hot water (immerse the bottom of the phone in 60°C water for 1-2 minutes), but this is risky for tightness.
⚠️ Warning: Do not use a knife or screwdriver instead of a plastic shoulder blade! Metal will slip and damage the battery or display plume. Also avoid overheating - if the body becomes hot to the touch (more than 70).°C), let it cool for 30 seconds.
Step-by-step: how to remove the cover of Redmi 9 without damage
Turn off the phone before you start and remove it. SIM-If the battery is swelling, don't try to disassemble it yourself. Go to the service center:
- Heat the glue. Turn the dryer on at medium power (or set the temperature at 60-70 °C at the thermal air station). Warm the lid around the perimeter, paying special attention to the corners and bottom (there is more glue there). Keep the dryer at a distance of 5-7 cm so as not to melt the plastic. Heat time: 2-3 minutes.
- Suction lid compartment. Apply the suction cup to the bottom of the phone (above the tray) SIM-If the lid doesn't lend itself, warm up for another 30 seconds. Don't pull too hard, you can rip off the fingerprint scanner plume!
- Scapula squashing. Put a plastic blade in the gap, and carefully guide it along the edge, separate the latches. Start at the lower left corner, there are fewer plumes. If you hear a crack, stop and warm up more.
- Remove the lid completely. Once all latches are removed, remove the lid by holding it around the corners. Don't pull the middle, you can damage the flexible plume of the camera.
Phone turned off and removed. SIM-map
The hair dryer will warm up to 60-70 ° C
Suction cup is mounted on the lower part of the body
Plastic spatula on hand
Isopropyl alcohol for cleaning glue residues-->
If the lid is not amenable even after heating, check:
- ❌ Have you overheated the body (plastic should be warm, but not hot).
- ❌ Are there not undetached latches (most often "stick" corners near the camera).
- ❌ Did you get a scapula under the plume (if you feel resistance, stop).
What to do if the cover is broken when removed?
What not to do when you are in a Redmi 9: top-up-5 rookie-buyer
Even if you carefully remove the lid, you can make critical errors that will cause your phone to break, and here are the most common ones:
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Use of metal tools | Scratches on the body, damage to plumes, short circuit | Use only plastic or wooden blades |
| Overheating of the shell (>80°C) | Deformation of plastic, detachment of the screen module, battery damage | Control the temperature with your hand (it should be warm, but not hot) |
| Sharp compartment of the lid | Breaking the plume of the fingerprint scanner or camera | Separate the cover slowly, checking resistance |
| Emission of alcohol on the motherboard | Corrosion of contacts, failure of microcircuits | Apply alcohol only on the lid, avoiding internal components |
| Ignoring a bloated battery | Battery explosion when trying to remove | When bloating immediately contact the service |
It's especially dangerous to damage the battery plume, because if you accidentally rip it, the phone will stop turning on even if the battery is working, and you'll need a soldering iron and microelectronics experience, and repairing yourself without skills can be short-circuit.
⚠️ Warning: If you see the battery blowing up after you remove the lid, don't try to remove it! Bloated Li-Pol batteries can ignite if punctured. Take the phone to service or dispose of the battery according to local regulations.
How to Stick the Cover Back: Temporary and Permanent Solutions
Once the lid is repaired, there are three ways to fix it.
- Double-sided 3M Scotch is suitable for temporary attachment. Cut the strips 5mm wide and stick them around the perimeter of the lid, avoiding the location of the plumes. Minus: over time, the Scotch will fall off, especially when the phone is heated.
- The B-7000 glue is applied in a thin layer to the edge of the lid. After drying (24 hours) it holds tight, but the next autopsy will take longer to heat. Don't use superglue - it damages the plastic!
- Original glue (replacement) You can buy adhesive kit for Redmi 9 on AliExpress (cost ~200 rubles), includes glue and guides for accurate application.
Before you stick, make sure to clean the lid edge and the phone body of the old glue with isopropyl alcohol. If there are traces of glue on the plumes, remove them with a cotton swab dipped in alcohol. Don't use wet wipes - they leave fibers.
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If the lid is a little bit "playing" around the corners after you stick it, put it under the press (for example, between two heavy books) for 12 hours, which will help the glue to spread evenly.
To check the leakage after assembly:
- 🔋 Connect your phone to charge and check if the battery is warmer than usual.
- 📶 Make sure the antenna is working (check the signal level of the network).
- 🔊 Call the phone – the speaker should not wheez (this is a sign of glue hitting the grille).
Frequent questions after the dismantling of Redmi 9: what to do if you are not ready to play.
Even with a careful disassembly, problems can arise. Let's look at typical situations and their solutions:
1.The phone does not turn on after assembly
Reasons:
- 🔌 The battery plume is not connected - check if it sits tightly in the connector.
- 🔋 Battery damaged – if the battery is swollen or deformed, replace it.
- 📱 Disconnected the display plume – disassemble the phone and check the connection.
If the phone vibrates but the screen doesn't turn on, the problem is with the display plume or the motherboard. If there is no reaction, check the battery with a multimeter (voltage should be 3.7-4.2 V).
2.The fingerprint scanner is not working.
The scanner plume is likely to have come off or bent, located under the lid, next to the battery connector, carefully lift it and check the integrity of the contacts, if the plume is torn, you will need a replacement (cost ~300-500 rubles).
3.The phone is overheating
Possible causes:
- 🔥 Bad battery contact - check if the plume is bent.
- 🧹 Dust on the processor - clean it with a brush or spray of compressed air.
- 🔧 Incorrectly applied glue - if the glue hit the radiator, remove it with alcohol.
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If the phone gets worse after disassembly, check the antenna plume (Redmi 9T) or the metal contacts under the lid. They may bend or oxidized.