Disassembly Xiaomi Redmi 7A: how to open the case without the risk of damaging the phone

Xiaomi Redmi 7A is one of the most popular budget smartphones of the brand, but even it has problems that require disassembly over time, from replacing the battery to cleaning the connectors. However, the design of the model has its own peculiarities, and improper opening of the body can lead to damage to the plumes, chipped glass or even failure of the power button.

In this article, you'll find a step-by-step photo guide, a list of tools you need, and unique tips to help you avoid typical disassembly errors, how to safely remove the back cover without damaging the adhesive layer, and what to do if the case is stuck to the frame, and also what hidden latches hold the board and how to properly unfasten them so as not to break them.

If you've never taken a smartphone apart before, don't worry. The Redmi 7A is a relatively simple design, and with the right approach, it can be opened even without professional experience.

Preparation for the disassembly: what will be needed

Before you start opening the case, make sure you have everything you need. Lacking even one tool can damage the phone. For example, trying to lid a knife instead of a mediator almost always ends in scratches or chips.

Here is the minimum set of tools you will need:

• 🔧 Plastic mediator (or guitar mediator) - for careful liding.
• 🔨 The screwdriver. PH00 (magnetic preferable) - for screws of the body.
• 🧲 Suction - helps to separate the cover if the glue is too strong.
• 🔥 Hair dryer or thermo-air station - for softening the glue (temperature not higher than 60)°C!).
• 📦 The screw tray - so as not to lose small details (in Redmi) 7A 8 grand).
• 🧴 Isopropyl alcohol 90%+ — glue-cleaner.

Also, prepare the workplace: the desk should be clean, well-lit and without carpeting (screws are easily lost in the pile); it is advisable to use an antistatic mat or at least touch an earthed object before work - static electricity can damage the motherboard.

⚠️ Warning: If the phone was in water or was exposed to high humidity, it is better to postpone the disassembly for 2-3 days.

Step 1: Turn off and remove the back cover

The first and most important step is to separate the back cover, which is attached to glue and plastic latches in the Xiaomi Redmi 7A, so you have to be careful, and if you pull the lid by force, you can break the latches or tear the fingerprint scanner plume (if you have one in your version).

Procedure:

1. Turn off the phone and remove it. SIM-scatter-card.
2. Heat the hair dryer around the perimeter for 1-2 minutes (hold the hair dryer at a distance of 5-7 cm!). The glue will become softer, and the cover will move away easier.
3. Suction the top of the lid (near the camera) and pull up. If the lid doesn't lend itself, gently apply the mediator to the side.
4. Once you have a crack, use the mediator around the perimeter to crack the clamps, and start at the top corner, and there's less risk of damaging the plumes.

If the lid doesn't lend itself, don't use force! Better dryer the problem areas again. Redmi 7A has particularly stubborn areas, near the charging socket and volume buttons.

Warm the cover with a hair dryer (max 60°C)|

Use the suction cup for initial tearing |

Push the mediator from the top corner |

Check for unclashed clamps around the perimeter-->

⚠️ Note: Some modifications of Redmi 7A have an extra layer of glue under the tray SIM-If the lid doesn't move out in this area, gently put it on there, but don't push too hard to avoid damaging the antenna contacts.

Step 2: Unscrew the screws and remove the metal plate

When you take the lid off, you'll see a metal plate that covers the battery and the motherboard, and it's attached to 8 screws of different lengths -- that's important -- if you confuse them with the parts you build, you can damage the board or the case.

How to properly unscrew the screws:

• 🔧 Use a magnetic screwdriver. PH00 — screws 7A very small and fall out easily.
• 📝 Place them on a piece of paper in the same order as on the board (or take a picture!) Long screws (3 pieces) are in the corners, short (5 pieces) in the center.
• ⚠️ Do not apply excessive force - the thread in the plastic case easily breaks off.

Once you unscrew the screws, carefully remove the metal plate, and underneath it you'll see:

• Battery (stick to the body).
• Camera plumes and fingerprint scanner.
• The motherboard connector (connected to the display).

Don't pull the plate up sharply, it can cling to the plumes. Better lift it slightly on one side and check if there are any obstacles.

Step 3: Disconnect the battery and plumes

Before you touch the motherboard, be sure to turn off the battery. Even a phone turned off can retain residual charge on the capacitors, which will lead to a short circuit when accidentally touched.

How to safely disconnect the battery:

1. Find the battery connector (usually black and located at the bottom of the board).
2. Carefully tuck the connector with a plastic spatula or a nail. Do not use metal tools!
3. After disconnecting, check with a multimeter that the voltage on the board contacts is 0 V.

Now you can disconnect the other plumes:

⚠️ Note: Fingerprint scanner plume in Redmi 7A It's very fragile. If it breaks, the scanner stops working, and it's almost impossible to replace it separately, and you have to change the entire back cover.

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If the plume doesn't detach, don't pull it by the wires! Try gently swinging from side to side or moisten the contacts with alcohol - sometimes helping to remove oxidation.

Step 4: Removing the motherboard

The motherboard in the Redmi 7A is mounted on 4 screws and a few latches, and the challenge is not to damage the flexible antenna contacts that are located on the sides of the board, and they easily break off if you don't pull the board carefully.

Extraction order:

1. Unscrew 4 screws (they can be under rubber plugs - check!).
2. Carefully raise the fee with a plastic spatula, starting at the top edge.
3. If the board gets stuck, check if you forgot to disconnect any plume (often it is the plume of a vibrating motor).

After you have retrieved the board, you will see the back side where:

• 📶 Antenna modules (do not touch them with metal tools!).
• 🔋 Battery contacts (can be covered with heatpaste).
• 🔊 Speaker and microphone (often glued to the body).

If you need to get to the charging connector or the buttons, you can take the board off completely, but if the goal is to replace the battery or clean it, just push it aside.

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Don't touch the board contacts with your bare hands - sweat and fat from the skin can cause corrosion.Use gloves or charge for edges.

Common Mistakes and How to Avoid Them

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

1.Display plume damage

The screen plume in this model is very thin and easily breaks if you bend it, always disconnect it last and fix the board so that the plume is not stretched.

2.Loss of screws

The screws in the Redmi 7A are of different lengths, and if you confuse them when you build them, you can damage the board. Use a magnetic mat or stick them on tape in order to unscrew.

3. Overheating of the body with a hairdryer

Many people heat the body too much to detach the lid faster, resulting in deformation of the plastic or detachment of the antenna tracks, the optimum temperature is 50-60 ° C, not higher!

4. Damage to the power button

The power button in this model is mounted on a fragile plastic locker, and if you press it when you remove the lid, the lock breaks, and the button starts to "fall over." Always remove the lid from the opposite angle.

5. Forget to disconnect the battery

This is the most dangerous mistake! Even if the phone is turned off, there is still a voltage on the board. When you touch it with a metal tool, you can burn the power controller. Always turn off the battery first thing!

Assembly of the phone after disassembly

Putting the Xiaomi Redmi 7A back together is often harder than disassembling, and the rule of thumb is to go backwards and check every step.

1. Checking the plumes

Before connecting the battery, make sure that all the plumes are tightly inserted into the connectors. Pay special attention to the plume of the display - it should lie flat, without inflections.

2. Rotary screw twisting

Screw the screws cross-cross so that the board is even. Don't pull them over, because the thread in the plastic case can break.

3. Sticking the lid

If you used a hair dryer to separate the lid, the original glue might lose its properties.

• Clean the remains of the old glue with alcohol.
• Apply a new 3M double-sided tape or a special B-7000 glue around the perimeter.
• Press the lid and warm it up with a hair dryer (40–50°C) for better fixation.

4. Testing before final assembly

Before you fully assemble the phone, plug in the battery and check:

• 🔋 Is the phone on.
• 📱 Does the sensor and display work.
• 📸 Are the cameras functioning.
• 🔊 Is there sound in the speaker and microphone.

⚠️ Warning: If the phone doesn't turn on after assembly, but when you connect to charging, the indicator shows - the problem is in the plume of the power button.

FAQ: Frequent questions about the dismantling of Xiaomi Redmi 7A