Disassembly Xiaomi Redmi 7A: a complete guide with step-by-step photos and expert tips

Why to Disassemble Redmi 7A and What to Know Before You Start

Xiaomi Redmi 7A is a popular budget model that, despite its simplicity of design, sometimes requires disassembly for repair or upgrade. The main reasons why users decide to disassemble themselves are: replacing the battery, cleaning from dust, recovering from a fall or moisture, and replacing the charging connector or speaker. However, improper disassembly can lead to damage to the plumes, detachment of the touchscreen or even complete failure of the device.

Before you start, consider that the Redmi 7A is built on latches and glue joints, and its body is not designed for frequent disassembly. If you've never disassembled a smartphone, practice on an old device or watch video instructions. In this article, we'll go through each step in detail, point out the hidden latches that beginners often break, and give recommendations for choosing tools. Ready?

Preparation: Tools and materials for safe disassembly

Without the right tools, it's almost impossible to disassemble the Redmi 7A. Here's the minimum kit you'll need:

• 🔧 Plastic mediator (or guitar) - to disconnect the body without scratches.
• 🔨 The screwdriver (PH00 or PH0) — screw-in.
• 🧲 Suction - helps to raise the screen after heating.
• 🔥 Dryer or thermo-air station - for softening the glue (temperature 60-80)°C).
• 🧴 Isopropyl alcohol (90%+) — glue-residue.
• 📦 Organizer for screws - so as not to lose small details.

⚠️ Warning: Do not use metal tools to disengage the body - they leave scratches and can damage antenna lines on the back cover. Also avoid overheating: if the glue does not respond, it is better to repeat the heating than increase the temperature above 80°C (risk of battery damage!).

If you’re disassembling a battery replacement phone, buy an original 4,000 mAh battery (MB-J20) in advance. Other uses (e.g., repairing the camera plume) may require a microscope or soldering station — but that’s a professional task.

Step 1: Removing the back cover - how not to break the latches

The Redmi 7A back cover is attached to glue and plastic latches, and the first mistake that newcomers make is to try to tamper with it from an angle without first heating it, and it causes cracks or snaps of the latches.

1. Turn off the phone and remove it. SIM-memory-card.
2. Heat the back cover around the perimeter with a hair dryer (30–40 seconds on each side).
3. Then, put the suction on the slack (there is less glue).
4. Insert a plastic mediator into the resulting gap and carefully lead along the body, snapping the mounts.

⚠️ Attention: Don't push the middle of the lid, because there's an antenna array that's easy to deform. If the lid doesn't respond, reheat the problem area. The most fragile latch is next to the power button, which is broken in 70% of cases of failure.

Heat the body around the perimeter |

Use the suction cup at the charging connector |

Insert the mediator not deeper than 2 mm|

Don't push the center of the lid.-->

Once you remove the lid, you'll see the battery, the motherboard and the plumes. Take your time to unplug them, take a picture of the location of all the elements first, so you don't get confused when you build them.

Step 2: Disconnecting the battery and plumes - the procedure

Before any internal manipulation, be sure to turn off the battery.

1. Carefully tuck the battery plume (it is under a black protective film).
2. Use a plastic spatula to lift the connector. Don't pull the wires!
3. Disconnect the display plumes, cameras and buttons (they are fixed with latches that open upwards).

⚠️ Warning: If you accidentally close the battery contacts with a metal tool, immediately disconnect it and do not turn on the phone for 10-15 minutes!

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If the plume doesn't detach, check if there's a locking screw next to the connector. In the Redmi 7A, the camera plume and the vibrator have these screws.

Step 3: Motherboard extraction – difficulties and nuances

The Redmi 7A motherboard is mounted on 8 screws and one hidden latch under the battery to remove it.

1. Unscrew all the screws (they are of different lengths - remember where you were!).
2. Carefully raise the charge from the charging socket. Don't pull the antenna wires!
3. If the board fails, check if you have forgotten to disconnect the speaker plume (it is hidden under a black tape).

⚠️ Warning: The board has a Qualcomm Snapdragon 439 chip that is sensitive to static electricity. Before working, touch a grounded object (such as a heating battery) or use an antistatic bracelet.

Once you remove the board, you'll have access to the speaker, the vibrator and the charging connector, and if you're looking to replace one of these, you can now start dismantling it, and you'll need to remove the front panel completely to replace the screen, which is what we'll talk about in the next section.

Step 4: Screen removal – risks and recommendations

The Redmi 7A screen is glued to the frame, and its plume runs under the motherboard.

1. Heat the front panel with a hair dryer (temperature 70°C, time 1-2 minutes).
2. Put the screen with a plastic card at the home button (there is less glue).
3. Carefully draw the map along the frame, separating the glue. Don't press the center, you can damage the matrix!

⚠️ Attention: At Redmi 7A The touchscreen and display plume are combined into one unit. If you tear the plume, you have to change the entire module, which is expensive (from 3000 rubles). If the goal is to replace the glass, you better give the phone to the service: self-replacement without experience often leads to the appearance of a "web" on the screen.

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If the screen is cracked, but the image is left, do not rush to remove it. In 80% of cases, the problem is solved by replacing the glass without dismantling the matrix, which is 2-3 times cheaper.

Phone Assembly: How to Avoid Mistakes

The Redmi 7A should be assembled in reverse order, but with a few nuances in mind:

• 🔄 Check all the plumes before fixing - they should sit tightly, without distortions.
• 🔋 Stick the battery to double-sided tape (original Xiaomi glue sold in service centers).
• 🔩 Screw the screws cross-curl to avoid skewing the board.
• 📱 Before final assembly, turn on the phone with the connected display to check the health.

⚠️ Note: If the phone does not turn on after assembly, check:

- Is the battery connected (a common mistake is forgetting to connect the plume).

- Are the contacts closed on the board (look for foreign objects).

Is the display plume sitting correctly (sometimes it falls out when you flip the phone over).

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To make the back cover sit tighter, warm it up with a hair dryer before installation (50°C temperature). The glue will become more elastic and there will be less gaps.

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling the Redmi 7A. Here are the most common:

If you doubt your abilities, better contact the service. The average cost of dismantling Redmi 7A in the workshops is 500-1000 rubles, which is cheaper than repair after a failed independent attempt.

FAQ: Answers to Frequent Questions