Xiaomi Redmi 9C is a budget smartphone with a non-removable battery, but sometimes users need access to internal components: to replace the battery, clean the dust or repair plumes. The main problem is a plastic lid on latches and glue, which is easy to damage if sloppy dismantling. In this article, we will analyze 3 safe ways to remove the lid, list the necessary tools and warn about typical errors that lead to cracks or plumes break.
It is important to understand that even if you have never disassembled smartphones, Redmi 9C can be opened yourself - its design is simpler than flagship models. However, the glue on the lid of this device loses elasticity over time, so after 2-3 years of operation the risk of damage increases by 2 times.
Preparation for disassembly: tools and security measures
Before you start, make sure you have everything you need, and without the right tools, you risk tearing the battery plume or leaving scratches on the body.
- 🔧 Plastic mediators (2-3 pieces) - for careful lid lashing. Metal blades will leave traces!
- 🔥 Dryer or thermo-air station - for softening the glue (temperature 60-80)°C).
- 🧲 Suction cup – helps to separate the lid from the body after heating.
- 🔌 Screwdriver. T3 — to unscrew the screws under the lid (if you plan to completely disassemble).
- 📦 Container for screws - so as not to lose small details.
If you don't have professional tools, you can do with the tools at hand: instead of a mediator, a plastic card will do, and instead of a hair dryer, a heating pad or hot water in a bag (but be careful with overheating!). The main rule is: do not use knives, scissors or screwdrivers for putting on - they will damage the plastic.
⚠️ Note: If the smartphone was in water or was hit, disassembly can lead to a short circuit due to oxidized contacts.
Method 1: Heating hair dryer and mediators (the safest)
This is a method that works for most users and minimizes the risk of damage, and the idea is to soften the adhesive around the perimeter of the lid and then carefully separate it.
- Turn off your smartphone and remove it. SIM-scatter-card.
- Heat the back cover around the perimeter with a hair dryer (don't direct air flow to one place for longer than 10 seconds!) Temperature - 60-80 ° C (the hand should tolerate, but not burn).
- Apply the suction cup to the bottom edge of the lid (where the charging connector is) and pull up. If the lid fails, repeat heating.
- Insert a plastic mediator into the gap, and slowly move it along the edge, separating the latches. Take your time, the latches are stronger at the corners of the lid!
If the lid starts to creak or resist, stop and reheat the problem area. Don't force it, it's better to spend an extra 5 minutes heating than to break the latch.
Will the glue heat up all over the perimeter?|Are you using a plastic mediator?|The suction cup fits tightly to the lid?|The screws under the lid are not unscrewed (unless you plan to completely disassemble)-->
Method 2: No heating (for power users)
If you don't have a hair dryer, you can try to remove the lid with a cold method, but it requires precision and patience. It's suitable for smartphones that haven't been overheated (the glue is less stiff).
- 📱 Start at the bottom edge (near the connector). USB-C), lens.
- 🔳 Insert the mediator in the gap between the lid and the body and gently wiggle it, trying to "crush" the mounts.
- 🔄 Repeat the process around the perimeter, gradually increasing the gap. If the lid does not lend itself, do not press harder, you better go to the method of heating.
⚠️ Warning: Without heating, the risk of breaking latches or leaving scratches on the body increases by 40%. 9C, released before 2021 – their glue is more durable.
If you hear a crunch, it means that the latch has broken, in which case continue carefully, but be prepared for the lid to sit less tightly after assembly.
Method 3: Removal of the lid after battery replacement (if the glue is already broken)
If you've changed your battery or opened your smartphone before, the glue on the lid may lose its properties, which is a simplified process, but there are some nuances:
- Check whether there are any foreign objects (screws, pieces of glue) inside the body.
- Start at the corner where the lid is already a little bit off (usually seen by the gap).
- Use a mediator to evenly separate the lid, but be careful - the battery plume may be glued to the lid!
If you find that the glue is still on the case after removing the lid, remove it with alcohol or a special cleaner.
What to do if the lid is cracked?
Common Mistakes and How to Avoid Them
Even experienced users sometimes make mistakes when disassembling the Redmi 9C. Here are the most common ones and ways to prevent them:
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Use of metal tools | Scratches on the body, damage to plumes | Use only plastic mediators. |
| Too much heat by a hair dryer | Deformation of plastic, detachment of the sensor from the screen | Keep the temperature not above 80°C, heat evenly |
| Sharp compartment of the lid | Breakage of battery plume or antenna | Separate the cover slowly, starting at the bottom edge |
| Disassembly without turning off the smartphone | Short circuit when touching the board | Always turn off the device and remove it. SIM-map |
Another common problem is damage to the rubber gasket seal (if any) that protects the smartphone from dust and moisture, and when you build it, make sure that the gasket is flat and not twisted.
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If the smartphone doesn't turn on after assembly, check if the battery plume is connected, and often it will leave when the lid is not installed neatly.
What to do after the lid is removed?
When the lid is finally removed, the Redmi 9C’s interior design will open up in front of you.
- 🔋 Battery replacement - if the battery is swelling or discharged quickly.The original battery is labeled BM47.
- 📶 Dust cleaning is especially important for the speaker and charging connector. Use a soft brush or compressed air balloon.
- 🛠️ Repair plumes -- if the screen or the camera isn't working, you'll need a soldering station.
- 🔄 Adhesive replacement - if the lid is not holding well after assembly. Use double-sided tape 3M 9448A.
If you want to replace your battery, remember that the new battery should be the same capacity (5,000 mAh) and don't buy cheap ones, because they may swell or not hold the charge.
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After any repair, check the tightness of the case. If the smartphone does not turn on, disassemble it again and check all the plumes.
Smartphone Assembly: How to Avoid Problems
Putting the Redmi 9C together after disassembly is as important as disassembling it properly.
- Make sure all plumes are connected (battery, screen, camera).
- Check if there are any foreign objects (screws, pieces of glue) inside.
- Set the lid in place and gently press it around the perimeter so that the latches fall into place.
- If the lid is not tight, use double-sided tape for fixation.
Once built, turn on your smartphone and check all the features: sensor, cameras, speakers, charging. If something doesn't work, disassemble the device again and check the connections.