The Xiaomi Redmi Note 4 is one of the most popular smartphones of 2017, but even after years, its owners are faced with the need to replace the battery, speaker or camera. The main problem: the back cover of the model is glued to the body, and remove it without preparation is a sure way to break latches or damage the plumes.
In this article, you will find a step-by-step photo instruction, a list of tools you need, and a list of common mistakes that cause your phone to break down. We will learn how to open a Redmi Note 4 with minimal risk, even if you don’t have experience repairing gadgets, and at the end, answers to frequent questions and tips on choosing a replacement for a lid or battery.
Preparation: What to Know Before Disassembly
Before you start screwdriver, consider: Redmi Note 4 (codenamed mido) has a non-removable back panel that is attached to double-sided tape and plastic latches.
- 🔧 Without special tools, the lid cannot be removed - when you try to prick a knife or credit card, you risk scratching the body or breaking the mounts.
- 🔋 The battery is glued to the lid, and it will have to be disconnected first, so as not to damage the plume.
- 📱 Xiaomi warranty is canceled upon self-opening (if it is still valid).
If your goal is to replace your battery, check the status of the battery through the engineering menu: enter the phone code ##4636##, then select Battery Information. If the capacity has fallen below 70% of its nominal value (3080 mAh for Redmi Note 4), it is time to think about replacing.
⚠️ Warning: Do not disassemble the phone at a charge level below 30%. Too-discharged battery can deform when disconnected, and fully charged - pose a danger if the contacts accidentally close.
Tools needed: what to buy and where
To disassemble the Redmi Note 4, you will need a minimum set of tools that can be ordered on AliExpress or bought from the electronics store:
| Tool. | Appointment | Where to buy | Cost, ₽ |
|---|---|---|---|
| Plastic spatula (suction cup + mediator) | Separation of the cover from the body without scratches | AliExpress, Fix Price. | 50–150 |
| Cross screwdriver PH00 | Turning the screws of the motherboard fastening | Any tool store | 80–200 |
| Tweezers with curved ends | Disconnection of plumes and battery | AliExpress, Chip and Deep. | 100–300 |
| Thermoclei or double-sided 3M Scotch | Reverse lid installation | Radio parts stores | 200–500 |
| Fen (optional) | Softening of glue for easy separation of the cover | Home or construction | — |
Critically important: Don't use metal blades or knives - they leave scratches on an aluminum frame and can damage plumes under the lid.Plastic mediators are sold in phone repair kits (look for "smartphone disassembly kit").
Step-by-step: how to remove the cover without damage
Follow this algorithm to minimize the risks:
- Turn off the phone and remove it. SIM-Wait until the case cools down (if the phone was in use).
- Heat the edges of the cover with a hair dryer (50–60°C) for 1-2 minutes. This will soften the glue. Don't overheat - the plastic can deform!
- Place the lid with a plastic blade starting at the lower left corner (near the charging socket). Insert the mediator to a depth of no more than 2 mm.
- Carefully drive the blade along the edge, separating the latches. If the lid does not lend itself, warm up the area again with a hairdryer.
- Remove the lid when all the latches are snapped. Don't pull it out, because there are plumes of the fingerprint scanner and antenna under the lid.
After removing the cover, you will see:
- 🔋 Battery (stick to the lid).
- 📶 antenna plumes and fingerprint scanner (attached to the cover).
- 🛠️ The screws of the motherboard fastening (they need to be twisted out for a complete parsing).
Is the phone off the grid?|Is it cut? SIM-map?|Is there a tweezer on hand for plumes?|Are you prepared for possible damage to the lid?-->
⚠️ Warning: If the phone doesn't turn on after the lid is removed, check the integrity of the battery plume. It's a common mistake to hit it with a spatula when the lid is separated.
What to do after removing the cover: further actions
When the lid is removed, you will have access to:
- 🔋 Battery - it can be replaced with a new (original articular: MB-BL3080MA).
- 📷 Main camera (13 MP, Sony module) IMX258 Samsung S5K3L8).
- 🔊 Dynamics (frequent problem - wheezing or lack of sound).
- 📡 Wi-Fi antennas and LTE (if there is a problem with the signal).
If your goal is to replace your battery, follow this order:
- Disconnect the battery plume with tweezers (gently slap the connector up).
- Heat the battery with a hair dryer (it is glued to the lid) and tuck it with a plastic spatula.
- Install a new battery, plug in the plume and check the phone before assembly (turn it on without a lid).
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If the new battery is not holding charge, check the power controller on the motherboard. Often the problem is not the battery, but the BQ24193 chip (resortment required).
Common Mistakes and How to Avoid Them
Even experienced craftsmen sometimes make mistakes when disassembling the Redmi Note 4.
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Use of metal tools | Scratches on the frame, damage to plumes | Use only plastic blades |
| Sharp compartment of the lid | Fracture of the fingerprint scanner plume | Separate the cover slowly, starting at the corner |
| Dryer overheating | Deformation of plastic, detachment of glue | Keep the hair dryer at a distance of 10 cm, the temperature is not higher than 60 ° C |
| Forgot to turn off the battery before work | Short circuit when touched with a screwdriver | Always disconnect the battery first. |
If you break the latches of the lid, do not despair: it can be glued back to the double-sided 3M 9448A tape (0.25 mm thick), the main thing is to clean the surfaces of the old glue with alcohol or acetone.
What if the phone doesn’t turn on after assembly?
How to glue the lid back: assembly tips
Building a phone is as responsible as disassembling it.
- 🧹 Clean the surfaces of dust and old glue with a cotton swab soaked in isopropyl alcohol.
- 📏 Check the location of the plumes – they should not bend or clamped with the lid.
- 🔥 Use a new glue: apply a thin layer of heat-glue or bilateral tape around the perimeter of the lid.
- 🔧 Twisting the screws cross-cross to avoid skewing the motherboard.
After assembly, check:
- Does the fingerprint scanner work (if the plume has been disconnected).
- Is there a lid on the back (if any, add glue).
- Does the phone charge (sometimes the battery plume is connected loosely).
⚠️ Warning: If you've got dead zones on the screen after you've assembled it, you've probably squeezed the plume of the display, and then you'll have to take the phone apart and check the plume's attachment.
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The rule of assembly is to take your time, and it's better to spend an extra 10 minutes checking each connector than looking for the cause of a speaker or camera that's not working.
Where to buy spare parts for Redmi Note 4: verified sellers
If you need original or quality parts, look for these options:
| Parts. | Article (original) | Where to buy | Price, ₽ |
|---|---|---|---|
| Battery | MB-BL3080MA | AliExpress (Xiaomi Original Store), "Svyaznoy" | 800–1500 |
| Back cover. | MZB6367IN (black) | AliExpress, MVideo. | 500–1200 |
| Main camera (13 MP) | XM-13MP-MIDO | AliExpress (seller "HONGKONG GOLDWAY"), "citrus" | 1200–2000 |
| Dynamician | DS-1608-MIDO | AliExpress, Eldorado. | 300–600 |
When buying a battery, pay attention to the capacity: the original is 4100 mAh (marking 3080 mAh is indicated nominal, the real one is above). Cheap analogues often have a capacity of 2500-3,000 mAh and quickly fail.
Tip: Before buying a lid, check its color code. For Redmi Note 4, options are available:
- MZB6367IN is black.
- MZB6368IN is gold.
- MZB6369IN is a gray (India version).