The Xiaomi Mi A3 is a popular smartphone with a unique design and ceramic back, but it requires special care to disassemble. Many users face the need to remove the lid to replace the battery, repair the camera or clean up the dust, but are afraid to damage the fragile case. In this article, we will discuss all the steps of the process, tell you what tools you need, and warn about typical errors.
It's important to understand that disassembling a smartphone is not warranty if it's still in effect. The manufacturer doesn't recommend self-repair, but with the right approach, the risks are minimized. We've collected the proven methods that service centers use and adapted them for home use. If you've never taken your phones apart before, carefully study each step and prepare the workplace.
Preparation for disassembly: tools and conditions
Before you start removing the lid, make sure you have everything you need. Xiaomi Mi A3 has adhesive mounting back, so you can't do without specialized tools. Here's the minimum set:
- 🔧 Plastic mediators or shoulder blades (2-3 - for tidy lids. Metal tools can scratch the body.
- 🔥 Hair dryer or thermo-air station for softening the glue. Optimal temperature: 60-80°C.
- 🧲 Suction - helps to evenly lift the cover after heating.
- 📦 The screw container - in Mi A3 10+ screws of different sizes, they are easy to confuse.
- 🧴 Isopropyl alcohol (90%+) — scaling.
Also prepare the workplace:
- 🪑 A flat surface with good lighting (ideal - a table with a lamp).
- 🧹 Clean microfibre to wipe dust and prints.
- ⚡ Antistatic bracelet (optional) – protects the board from static electricity.
⚠️ Warning: Do not use a household hair dryer at maximum power - it can overheat the display or battery. Keep it 10-15 cm away from the case and move constantly to avoid local overheating.
Step-by-step: how to remove the back cover
The process of disassembling the Xiaomi Mi A3 consists of several key steps: follow the instructions strictly in order to avoid damage, it will take 20-30 minutes depending on the experience.
Step 1: Turn off and prepare the phone
Before disassembly completely turn off the smartphone and remove SIM-If the battery is swelling, don't try to disassemble the phone yourself, it's dangerous.
We also recommend removing the checkhall (if any) and rubbing the body with alcohol - this will remove fat and dirt that can interfere with the suction cup.
Step 2: Heating the glue layer
Turn the dryer on at medium power (60-70°C) and warm the back cover evenly around the perimeter for 2-3 minutes. Pay special attention to the corners - there the glue usually holds tighter. Do not direct hot air to the display or cameras!
Check if the glue has softened: press the lid near the charging connector a little bit, and if it's playing a little bit, you can move on to the next step.
Step 3: Finishing the cover with a mediator
Put a suction cup on the bottom of the lid (above the Xiaomi logo) and pull up slightly. Insert a plastic mediator into the gap and gently swipe it along the side frame, separating the glue. Take your time — if the lid doesn't lend itself, warm it up again.
Once the mediator passes through the perimeter, the lid should separate, and if you hear a crack, it's the adhesive anchors bursting, not the body itself (normally).
Is the phone off?|Whether removed SIM-card?|Will the glue warm up all over the perimeter?|Are plastic mediators ready?|Is there a screw container?-->
Step 4: Disconnecting the plumes
When you take the lid off, you'll see the battery and some plumes. Don't pull the lid out, it's connected to the body by a thin fingerprint scanner plume! Take it off carefully with a plastic blade (usually attached to the latch).
Also, turn off the battery connector to avoid short circuits, so you can apply a black plastic lock and carefully pull out the plume.
⚠️ Warning: If you find that the fingerprint scanner plume has broken after removing the cover, don't panic. It can be replaced separately (article: Xiaomi) 19041516-01), But it's gonna take rations on the service.
Common Mistakes and How to Avoid Them
Even experienced users sometimes make mistakes when disassembling the Mi A3, and we have collected the most common of them and ways to prevent them:
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Use of metal tools | Scratches on the lid, damage to plumes | Use only plastic or nylon mediators |
| Overheating by a hairdryer (>80°C) | Deformation of plastic, detachment of the display | Control the temperature with a thermometer or tactile (the body should be warm, but not hot) |
| Sharp compartment of the lid | Fracture of the fingerprint scanner plume | Check for the plumes before removing the lid completely. |
| Dust ingress on the adhesive layer | Poor fixation of the cover after assembly | Work in a clean room, wipe the details with alcohol |
Another common problem is that the adhesive layer is damaged when reassembled, so if you plan to reassemble the phone, buy a new adhesive tape (e.g. 3M 9448A or similar) in advance, the old adhesive loses its properties after heating and will not ensure leakage.
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If the lid is creaking when you press it, it means that the glue is not uniformly applied, disassemble the phone again, clean the frame with alcohol and paste a new double-sided tape.
What to do after removing the cover: further actions
When the lid is successfully removed, the internal design of the Xiaomi Mi A3 will open before you.
- 🔋 Battery replacement is the most common cause of disassembly. The original battery has an articular MDY11EF (4030mAh).
- 📸 Camera cleaning – dust on modules can degrade photo quality. Use a soft brush and compressed air.
- 🛠️ Charging connector repair – if the phone isn’t charging, the problem may be oxidized contacts.
- 🔄 Replacement of speaker or microphone – these elements often fail after moisture is ingested.
If your goal is to replace the battery, note that it's glued to the body.
- Disconnect the battery connector.
- Push the battery with a plastic spatula (start at the corner).
- If the glue is too strong - carefully warm it with a hairdryer (not higher than 60 ° C!).
- Install a new battery and connect the connector.
How to check the originality of the battery?
Phone Assembly: How to Put Everything Back in Place
Getting the Xiaomi Mi A3 back together is as important as taking it apart.
- Check all the plumes -- they should be plugged in before you click. Pay special attention to the plume of the fingerprint scanner and the display.
- Apply new glue – if you use double-sided tape, cut it with strips around the perimeter of the lid, leaving holes for the speaker and microphone.
- Line the lid -- start pressing it on the top (where the cameras are), then gradually lower down. Make sure all the gaps are uniform.
- Twirl the screws -- use a magnetic screwdriver and watch for the force. The screws in the Mi A3 are fragile and can break when you pull over.
After assembly, turn on the phone and check:
- Is the fingerprint scanner working?
- Is the battery charging?
- Do you have any noises when you press the lid (this is a sign of poor fixation).
- Are the cameras and speakers functioning?
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If the phone doesn't turn on after assembly, check the battery plume and display connection, and 90 percent of the time, that's where the problem is.
Alternative methods: when the standard method does not work
Sometimes the Xiaomi Mi A3 lid doesn't respond even after heating, which may be due to:
- Too old glue (if the phone was used in hot climates).
- Damage to the lid after the fall.
- Factory marriage (excess glue).
Alternative methods can be tried in such cases:
Method 1: Use of thread or line
Drain a thin nylon thread (like a guitar string) between the lid and the body, carefully saw it with a glue layer while warming up with a hair dryer, which takes patience but minimizes the risk of damage to the lid.
Method 2: Disassembly from the display side
If the lid is not removed and you need to take the phone apart immediately, you can try starting with the display.
- Warm up the front panel with a hair dryer (temperature 50–60 °C).
- Put the display on the side of the switching button with a plastic spatula.
- Keep it up (do not remove the stains!)
- Take out the motherboard and unplug the lid from the inside.
This method is risky – there is a high probability of damaging the display or plumes, so use it only as a last resort.
⚠️ Warning: If the lid cracks when disassembling, don't try to glue it with superglue! This is a temporary solution that will degrade the antenna signal and may damage the internal components. 19041516-02).