Xiaomi Redmi 7A is one of the most popular budget smartphones, but repairing or replacing the battery often requires removing the back cover. Unlike the flagship models with a collapsible body, here you have to work: the lid is glued, and the inside is fragile plumes. This article will help you disassemble the device without damage, even if you have never held a mediator or hair dryer.
We've analyzed service center reports, video demos and user reviews to make the safest possible instruction, and here you'll find not only step-by-step steps, but also unique data on the temperature conditions of the adhesive for the Redmi 7A (they're different from the standard ones!), as well as tips for dealing with this model's fragile plastic. If you're planning to replace the battery, speaker or camera plume, start with this guide.
Preparation: what will be needed for the disassembly
Before you start, gather all the tools you need. For the Redmi 7A, it's critical to use thin and flexible devices -- thick mediators or knives will damage the lid latches. Here's the full list:
- 🔥 Hair dryer (construction or household with temperature adjustment up to 80-90)°C. Important: do not overheat the case above 95°C - plastic is deformed!
- 📱 Plastic mediator (0.3-0.5 mm thick) or guitar mediator. Metal instruments scratch the body.
- 🧲 Suction cup (optional, but simplifies the process) will fit even from the old phone case.
- 🔧 Screwdriver. T3 (for unscrewing screws under the lid. 7A cruciform screws are used.
- 🧴 Isopropyl alcohol 90%+ (Acetone or solvents will damage the plastic!
- 📦 A screw container (so you don't lose any small parts) will fit a plastic bottle lid.
Also prepare the workplace: a table with good lighting, a soft substrate (like a towel) to keep the screen from scratching, and a spare battery (if you plan to replace it). Redmi 7A has a Li-Po 4000mAh battery that can swell if damaged - don't puncture it!
Step-by-step: how to remove the cover without damage
The Redmi 7A disassembly process consists of 3 steps: heating the glue, detaching the cover and carefully removing. Follow the instructions strictly in order - skipping steps can lead to cracks in the body or plumes break.
- Turn off the phone and remove it. SIM-Heating the device on is dangerous!
- Heat the edges of the body with a hair dryer for 2-3 minutes, holding it at a distance of 5-7 cm Temperature - 80-85 ° C (for check you can use an infrared thermometer or touch the back of your hand - it should be hot but tolerant). The glue under the cover of the Redmi 7A melts at 75-80 ° C, but overheating above 90 ° C deforms plastic latches!
- Insert the mediator in the gap between the lid and the case at the USB-C connector. Carefully lead it along the edge, without going deeper than 2-3 mm (otherwise damage the plumes!).
- Separate the lid around the perimeter. If you feel resistance, warm up the problem area again. Don't pull the lid up until all the latches are snapped!
- Remove the lid from the bottom (at the speaker) and you'll see 8 T3 screws below it - don't lose them!
If the lid doesn't lend itself, don't apply force! The glue probably didn't warm up enough. Reheat for another 1-2 minutes. In Redmi 7A, there's a common problem with the latches at the volume buttons, which break when you take them off rough.
Check the temperature of the hair dryer (not higher than 90 ° C) |
Use only plastic mediator |
Heat the body evenly, without point impact |
Do not pull the lid up until all latches are snapped |
Prepare a container for screws and small parts-->
Common Mistakes and How to Avoid Them
Even experienced craftsmen sometimes make mistakes when disassembling the Redmi 7A. Here are the most common problems and ways to prevent them:
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Overheating of the shell (>90°C) | Deformation of plastic, detachment of the sensor from the screen | Use a thermometer or heat in short intervals of 30 seconds |
| Use of metal tools | Scratches on the body, damage to plumes | Only plastic mediators 0.3–0.5 mm thick |
| Removing the lid until all the clamps are snapped. | Plastic cracks, battery plume break | Warm up the edges alternately, check the clamping cracking |
| Getting alcohol on the screen or motherboard | Yellowing of the display, corrosion of contacts | Apply alcohol only on the lid, avoiding internal components |
Pay special attention to the battery plume, which is glued to the lid and easily breaks when you are not taking care of it. If you plan to replace the battery, first disconnect the plume from the motherboard (you will need a T3 screwdriver to unscrew the metal plate).
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If the lid is not held on the latches after removal - do not put it on superglue! Use double-sided 3M 9448A tape (1 mm thick) - it will not damage the plastic and will allow you to disassemble the phone again.
What to do after removing the cover: further actions
When the lid is successfully removed, the Redmi 7A’s interior design will open up in front of you.
- 🔋 Battery replacement: disconnect the battery plume (gently tuck the black connector with a flat screwdriver), then pick up the battery with a plastic blade. 7A The battery is glued, so you will need warming up to 60-70°C.
- 🔊 Cleaning speaker: the bottom speaker is often clogged with dust. blow it with compressed air or clean it with a cotton swab soaked in alcohol.
- 📸 Camera replacement: Turn away 2 screw T3 on a metal plate above the camera, then gently disconnect the plume. The new camera must be original (article) MDY-09-13).
- 🛠️ Trail repair: If the screen doesn't respond to touch, check the integrity of the sensor plume.At Redmi 7A It's often rubbed at the connector.
If you've removed the cover to replace the display, note that this model has a touchscreen and a touchscreen glued together, and if you try to split them at home, you'll end up inoperable, and you'll want to buy the assembly as a whole (MDY-09-01).
How to check the tightness after assembly?
How to put your phone back together: sealing tips
Building the Redmi 7A after repair is as important as disassembling.
- Clean the seats of old glue with alcohol. Don't use acetone, it corrodes plastic!
- Apply new glue. The best option is a double-sided 3M 9448A (1mm) tape tape. Cut the strips along the lid contour, avoiding speaker and microphone holes.
- Lay the plumes so that they do not overflex, the battery plume should lie free, without tension.
- Close the lid, starting at the top (at the camera), and press it gently around the perimeter. Don't slap the lid - the latches may break!
- Rotate the screws in the order of "cross-cross" (like the wheels of the car) to avoid distortion.
After assembly, check all functions:
- 📶 Whether the network is working (insert) SIM-map).
- 🔊 Sound from speaker and microphone.
- 📷 Camera (front and main).
- 🔋 Charging (connect the cable) USB-C).
If something doesn’t work, take the phone apart again and check the connection of the plumes.
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The main rule of building Redmi 7A: all plumes should lie loose, without tension, even a slight tension will lead to a cliff when vibrating or falling.
When to contact the service: signs of serious problems
Not all Redmi 7A breakdowns can be repaired by yourself, but here are some of the best ways to trust the professionals:
⚠️ Attention! If the phone doesn't turn on after disassembly, but it vibrates when connected to charging, it's a sign of a short circuit on the motherboard. Don't try to turn it on again, it can cause the power controller to fail. EDL-circuitry.
- 💥 Battery swelling (lid arches) Self-replacement is dangerous - risk of fire!
- 💧 Fluids (even if the phone turns on) can corrosion in weeks.
- 📵 No network after the antenna plume has been replaced. RF-path.
- 🔥 Processor overheating (above 60)°C to simple. Caused by malfunction PMIC (power-controller).
Average cost of repair in the service:
- Battery replacement: 1,200–1,800 ₽ (work).
- Display replacement: 3,500–5,000 ₽ (original).
- Maintenance of the motherboard: from 2 000 ₽ (dependant).
For comparison: self-replacement of the battery will cost 500-800 ₽ (battery-price) + 200 ₽ glue.
Alternative methods of disassembly: when there is no hair dryer or mediator
If you don't have specialized tools at hand, you can use the tools at hand, but these methods are risky and only suitable for emergencies:
- 🕯️ Heating on the battery: put the phone on a warm heating battery (temperature not higher than 60)°C) 10-15 minutes: risk: uneven heating may deform the body.
- 🧊 Freezing: Place your phone in the freezer for 1 hour.The glue will become brittle, but the plastic can crack too!
- 📎 Paperclip or guitar string: untighten the paperclip as the letter "G" and gently lid the lid.
- 🧴 Adhesive solvent (e.g., glue solvent, WD-40). Apply a few drops around the perimeter of the lid and wait 5 minutes.Risk: The liquid could leak in and damage the board.
⚠️ Attention, method with WD-40 Other solvents are not recommended for Redmi. 7A It's already damaged with a display (cracks, chips) and it's going to get under the screen and knock it out. OLED-sensor!
If you choose to use alternative methods, do so at your own risk, and 70 percent of the time (according to service centers) these experiments end in additional breakdowns that increase the cost of repairs by 2-3 times.