Disassembly Xiaomi Redmi 7: step-by-step guide with photos and tips

The Xiaomi Redmi 7, released in 2019, remains a popular budget smartphone due to its robust build and balanced performance. However, even such a device can require repairs over time, from replacing the battery to cleaning the connectors or diagnosing the motherboard. Disassembling the Redmi 7 is not the most difficult task, but requires accuracy and the right tools. In this article, you will find a step-by-step instruction with photos, a list of necessary tools, and key nuances that will help avoid errors.

It's important to understand that self-disassembly is insecure (if it's still in place) and can damage components if you've never disassembled a smartphone, work out on a broken device or go to a service center, but for power users or those willing to take risks, our guide will be a reliable assistant.

Preparation for disassembly: tools and security measures

Before you start, make sure you have everything you need, and the wrong tools are the main cause of the shell chipping, the damaged plumes and the screws being torn, and here's the minimum set you'll need:

• 🔧 Plastic mediators (2-3 (a) - for separation of the back cover without scratches.
• ⚒️ Set of screwdrivers (cross-haul) PH00, pentalobe P2) — for the Redmi 7 screws.
• 🧲 Magnetic mat or container – to avoid losing small details.
• 🔥 Hair dryer or thermoair station - for softening the glue (optional, but recommended).
• 📸 Smartphone to capture the process – fix each step so as not to confuse the order of the assembly.

Also prepare your workspace: a clean desk with good lighting, no carpets (to keep the screws out) and away from static electricity sources. If you disassemble the device because of fluid intake, pre-dry it in rice or silica gel for at least 24 hours - disassembling a wet smartphone can cause a short circuit when turned on.

⚠️ Warning: Do not use metal mediators or knives to separate the lid - this is almost guaranteed to damage the plastic latches inside the case. The glue on the Redmi 7 is strong enough, but can be neatly heated with a hairdryer (temperature not above 60).°C).

Step 1: Removing the back cover

The back cover of Xiaomi Redmi 7 is attached to glue and plastic latches. To remove it, follow the following steps:

1. Turn off your smartphone and remove the tray for SIM-cards (use a paper clip or special key).
2. Heat the edge of the body with a hair dryer around the perimeter for 1-2 minutes. This will soften the glue and facilitate separation.
3. Insert a plastic mediator into the gap between the lid and the housing (start at the bottom edge where the charging connector is). Carefully drive the mediator along the housing, separating the latches.
4. As soon as the lid begins to move away, do not pull it sharply - under it there are plumes of the fingerprint scanner and antenna contacts.

If the lid fails, reheat the problem areas. Don't force too much because the plastic may crack. After removing the lid, put it aside and inspect the insides for dust or corrosion (especially if the device has come into contact with moisture).

Step 2: Shutting off the battery

Before you continue disassembling, be sure to turn off the battery, which will prevent short circuits from accidentally touching the contacts. On the Redmi 7 motherboard, the battery connector is located at the top (under the metal screen).

To disconnect the battery:

1. Put a plastic mediator on the black battery connector (it is usually marked in red or orange).
2. Carefully pull the connector up, it should come out without effort.
3. Check with the voltmeter (if any) that there is no voltage on the contacts of the battery.

If the connector is stuck and does not move away, do not use force - moisten it with 90% isopropyl alcohol and try again in 5 minutes. Damage to the connector can make it impossible to charge the device after assembly.

⚠️ Warning: Never use metal objects to disconnect the battery.Even static electricity can damage the power controller on the motherboard.

Step 3: Removing the motherboard

The Redmi 7 motherboard is mounted on 10 screws (of different lengths!) and multiple plumes, and before you remove it, take a picture of the layout of all the components, which will make it easier to reverse assemble.

1. Unscrew all the screws starting with the longest ones (usually located at the corners of the board).
2. Disconnect the plumes: 📱 Display (the widest, at the bottom). 🔊 Dynamics and microphone (thin ribbons in the middle part). 📷 Cameras (short plume at the top).

Carefully tuck the board with a plastic spatula, starting at the top edge.

If the board doesn't come out, check if all the screws are unscrewed. Sometimes there are additional mounts under the stickers or plumes. After extraction, check the board for darkening, chipping or corrosion - these are signs of damage that needs repair.

Step 4: Diagnostics and replacement of components

Now that the device is disassembled, you can start diagnosing or replacing parts, and consider the most common Redmi 7 problems and how to fix them:

• 🔋 Battery: If the battery is swelling or does not hold the charge, replace it with a new one (original model — BM47). Use bilateral tape to fix.
• 📲 Display: If cracks or a broken screen, replace the module entirely (including the touchscreen.
• 🔌 Charging connector: If the smartphone is not charging, clean the contacts with alcohol or replace the connector (model) USB-C 24pin).
• 📡 Antenna: Bad network signal is often associated with broken contacts or damaged plume.

When replacing components, use only compatible parts. For example, the Redmi 8 battery will not work for the Redmi 7 due to different connectors. If you are not sure about the part model, check the official documentation of Xiaomi or the spare parts catalogs (for example, AliExpress or eBay).

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Before assembly, clean all contacts on the board and plumes with a cotton swab dipped in isopropyl alcohol, which will improve the connection and prevent corrosion.

Step 5: Assembly of the device

The Xiaomi Redmi 7 is assembled in reverse order, but with a few nuances in mind:

1. Make sure all plumes are connected to the point – a undressed connector can cause a broken display or camera.
2. Screw the screws cross-twisted to avoid skewing the board. Don't use excessive force - the thread in the aluminum case easily breaks.
3. Before you install the back cover, check all the buttons and connectors. If something doesn't work, disassemble the device again.
4. Use a new double-sided tape (e.g. 3M 9448A) or a special glue B-7000 to fix the lid.

After assembly, turn on the smartphone and check:

• 🔋 Charging (plug the cable and make sure the current is going on).
• 📶 Network signal and Wi-Fi.
• 📷 Operation of the cameras (front and main).
• 🔊 Sound in the speaker and microphone.

⚠️ Warning: If the smartphone doesn't turn on after assembly, check the battery and display connection. A common mistake is a forgotten disconnected plume or an incorrectly inserted one. SIM-card that pushes down the board.

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The most common cause of failure after dismantling is incomplete connection of the plumes. Always check their fixation before final assembly.

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling the Redmi 7, and here are the most common ones and ways to prevent them:

• 🔧 Torn screws: Use a high-quality magnetic-tipped screwdriver. If the screw is licked, try removing it with a rubber band or a special extractor.
• 🔥 Train damage: Never pull wires, only take the hard parts of the connectors. Redmi 7 plumes are particularly fragile in the fingerprint scanner.
• 💥 Short circuit: Always turn off the battery before working with the board. If you accidentally touch contacts, check the charge for darkening.
• 📉 Loss of parts: Magnetic mat and screw containers are your best friends.

If you have damaged the board or plume, don't panic. Many of the components of the Redmi 7 can be found on AliExpress or in service centers. For example, replacing the display module will cost 2000-3,000 rubles, and repairing the board (for minor damage) - from 1500 rubles.

FAQ: Answers to popular questions