How to Disassemble Xiaomi Redmi 7A: detailed instructions with photos and nuances

Introduction: when you need to disassemble Xiaomi Redmi 7A and what you need to know in advance

Disassembly of the smartphone Xiaomi Redmi 7A — The challenge that owners face when replacing a battery, repairing a screen, cleaning connectors or diagnosing internal components, which was launched in 2019 despite the budget price tag, is modular, making it easier to access key nodes. However, incorrect actions can lead to damage to the plumes, disconnection of contacts or even failure of the board.

Before you start, evaluate your skills: if you have never held a screwdriver in your hands T3 Or tweezers, you should go to the service center, and in this article, we'll look at the process in stages, from tool preparation to reassembly, and also point out the critical points that beginners often miss. 7A Fingerprint scanner plume is glued to the back cover - it is easy to tear with careless removal.

We will pay special attention to safety: working with lithium-ion batteries requires caution. Even a dead battery can ignite when short-circuited, so we will describe in detail how to avoid risks. If your goal is to replace the display or battery, prepare for the fact that it will require patience and accuracy: in low-end models Xiaomi often saves on glue, but compensate for this by the fragility of the mounts.

Preparation for disassembly: tools and precautions

For disassembly Xiaomi Redmi 7A You're going to need a minimal set of tools, but each one is important:

• 🔧 Screwdriver. T3 (Torx - for the back cover screws. Normal cross-top won't work!
• 📱 Plastic blade or mediator - to separate the lid from the body without scratches.
• 🔋 Tweezers with curved ends - for working with small plumes and connectors.
• 🧲 Magnetic mat or container - so as not to lose the screws (there are 8 pieces).
• 🔥 Insulation or shrink tube - for insulation of the battery when replaced.
• 📸 Smartphone for photography – fix the location of parts before taking off.

Before starting work, be sure to turn off the phone and remove it. SIM-If the battery is swelling, don't try to disassemble the device yourself, call a specialist. Bloating indicates battery damage, and any mechanical impact can cause a fire.

⚠️ Warning: Do not use metal tools to separate the back cover - this will damage the antenna lines (thin copper tracks at the edges of the case.

Also, prepare your workspace: the desk should be clean, well-lit and free of static electricity (ideally an antistatic mat). If you replace the battery, buy the original battery in advance. BYD Sunwoda with a capacity of 4000 mAh – cheap counterparts quickly lose capacity and can swell.

Removal of the back cover: how not to damage the plumes and antennas

Let's start with the most important part, the back lid. 7A It's mounted on 8 screws. T3 And then there's the two-way tape:

1. Unscrew all the screws around the perimeter of the lid. They are of different lengths — remember where it was (long usually at the charging connector).
2. Insert a plastic blade into the gap between the lid and the case at the connector USB-C. Carefully lead it along the edge, separating the glue.
3. Lift the lid at the top left corner (where the camera is) Be careful, there's a fingerprint scanner plume going through!
4. Disconnect the scanner plume by tweezing it with a black tongue, locking it.

If the lid doesn't lend itself, don't force it -- chances are you missed the screw or didn't completely separate the glue. 7A There is a common problem with the speaker glued: it can stay on the lid or on the board. Carefully separate it with tweezers without damaging the contacts.

⚠️ Warning: If you see corrosion on the board after removing the lid (green or white spots), do not continue disassembling. This is a sign of moisture intake - professional ultrasound cleaning is required.

At this stage, we recommend taking a picture of the location of all plumes and connectors. 7A There are few of them, but it's easy to mix up the connectors, especially if you're first in the business of repairing them. For example, the main camera connector and the fingerprint scanner connector look almost identical, but have different numbers of contacts.

Battery Disconnection: Why It’s Critical and How to Do It Right

Before you touch the board or plumes, be sure to turn off the battery. - Xiaomi Redmi 7A It's plugged in through a connector. JST 1.0 (white connector with orange lock) Here's how to do it safely:

• 🔌 Find the battery connector on the board – it is located next to the lower edge, under the metal screen.
• 📌 Carefully tuck the orange fixator upwards (it will crack off with a characteristic sound).
• ⚡ Do not touch the battery contacts with metal tools – this can cause a short circuit.
• 📸 Take a photo of the polarity of the connection (plus and minus on the battery and board should match).

If the lock connector breaks, do not try to connect the battery without it - this will lead to poor contact and overheating, in which case it is better to replace the connector completely (the detail costs a penny).

After the battery is turned off, wait 2-3 minutes to let the residual capacitors on the board run out. If you plan to solder or clean contacts, use an antistatic bracelet to avoid damage to the chips by static electricity.

Dismantling of the main components: board, camera, speaker

Once the battery is turned off, you can start dismantling the rest of the parts. 7A The board is attached to 4 screws and a few glue points:

1. Unscrew the screws that hold the metal screen over the board (they can be of different lengths).
2. Carefully remove the screen, starting at the corner near the charging connector, and underneath it are the camera and display plumes.
3. Disconnect all the plumes by tweezing the black locks. 7A There are three: the main camera, the front camera and the display.
4. If you need to remove the board, solder off the contacts of the vibration motor (they are soldered to the board).

The camera and speaker can be dismantled without a soldering iron — they are attached to glue or latches. The main rule is: don't pull the plumes. In Xiaomi's budget models, they are often soldered to the board and easily detached. If the plume is detached, you can solder it back, but this requires experience with the microscope.

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If you only need to replace the speaker, you don't have to remove the board, just disconnect the connector (it's next to the charging connector) and carefully separate the speaker from the body with a plastic blade.

When dismantling the board, look out for the heat paste under the processor. 7A It often dries out, which leads to overheating. If you notice that the paste has become hard, remove it with alcohol and apply a new one (for example, Arctic). MX-4).

Battery replacement: battery selection and installation nuances

Battery is the most common reason to disassemble Xiaomi Redmi 7A. The average lifespan is 2-3 years, after which the capacity drops by 30-40:

• 🔋 Capacity: 4,000 mAh (original) 5,000 mAh batteries will not fit into the case.
• 🏭 Manufacturer — BYD or Sunwoda (Chinese originals). Avoid no-name brands.
• 📅 Production date is 6 months or less, and older batteries lose capacity before installation.
• 🔌 The connector should be JST 1.0 with orange fixator (as in the original).

Replacement process:

1. Turn off the old battery (as described above).
2. Put a plastic blade on the side where there are no board components. 7A It's glued to a double-sided scotch.
3. If the glue is too strong, use isopropyl alcohol (not acetone!) – it dissolves the adhesive layer.
4. Install a new battery, making sure the plume is not twisted. Secure it with tape (you can use the original Xiaomi glue or a quality double-sided scotch). 3M).

⚠️ Warning: If the phone doesn't turn on after you replace the battery, check the polarity of the connection "+" and the "-" can burn the power controller, and then you need to replace the board.

After installing the new battery, we recommend calibrating:

1. Charge your phone to 100% and keep charging for another 1 hour.
2. Turn off the charging and discharge until it is automatically turned off.
3. Repeat the cycle 2-3 times, which will help the controller to correctly determine the capacity.

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Use only original or certified batteries, and cheap ones can not only fail quickly, but also cause fire.

Phone Assembly: How to Avoid Errors and Check Out Your Operability

Assembling Xiaomi Redmi 7A It's in reverse order, but it's got its own nuances:

• 🔍 Make sure the contacts are free of dust or oxidation. Clean them with alcohol if necessary.
• 📱 Check that all the plume locks are snapped to the end (should be heard clicking).
• 🔋 Connect the battery last when all other components are in place.
• 🔧 Twisting the screws cross-cross to avoid skewing the fee.

Don't turn on the phone after assembly.

1. Whether all screws are twisted (a missed screw can cause vibration or poor contact).
2. Is there any gap between the lid and the body (this is a sign of improper installation of plumes).
3. Whether the volume and power buttons are working (they are often clamped when assembled).

If the phone is not switched on:

• 🔌 Check the battery connection (possibly not fully inserted connector).
• 📱 Disconnect and connect back the display plume – it may not be fully inserted.
• 🔧 If before the dismantling the phone worked, and after – no, most likely damaged the board (check for chips or burnouts).

If everything is assembled correctly, but the phone is buggy (rebooting itself, not seeing). SIM-map), reset to factory settings via Recovery:

1. Turn off the phone.
2. Press Volume Up + Power before the Mi logo appears.
3. Select Wipe Data → Wipe All Data (Change Volume Buttons).

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling Xiaomi Redmi 7A. Here are the most common ones and ways to prevent them:

Another common problem is poor contact. SIM-This happens when the tray is assembled. SIM Make sure it sits flat and doesn't slug. If the tray contacts are oxidized, clean them with a blower or alcohol.

If the phone discharges quickly after battery replacement, possible reasons:

• 🔋 Low quality battery (check manufacturer).
• 📱 Calibration not performed (discharge to 0% and charge to 100% 2-3 times).
• 🔧 Damaged power controller on the board (requires diagnosis).

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If the speakers stop working after the dismantling, check if the plume is clamped under the board. 7A It often shifts when assembled and blocks the sound.

FAQ: Answers to Frequent Questions About Xiaomi Redmi Disassembly 7A