Disassembly Xiaomi Redmi 7A: a complete guide with photos and tips

Xiaomi Redmi 7A is one of the brand’s most popular budget smartphones, released in 2019. Despite its simplicity of design, its disassembly requires care: the battery’s brittle plume, adhesive rear panel fixation, and compact component arrangement can create difficulties for beginners. This article will help disassemble the device without damage – from tool preparation to motherboard dismantling.

We'll look at not only the standard procedure, but also the typical errors that cause plumes to break or flexible cables to break, and we'll focus on battery shutdown, a key step that many people miss out on at the risk of short circuit. If you're planning to replace a battery, speaker or camera, here's a unique guide to working with Redmi 7A adhesives that aren't in the standard instructions.

Warning: Disassembly will void the warranty (if it still works), if you doubt your skills, contact the service center, but if you decide to act on your own, follow our steps carefully.

Preparation for disassembly: tools and security measures

Before you start, you need to assemble the tools you need, and without them, it's almost impossible to disassemble the Redmi 7A without damage.

• 🔧 Plastic blades (2-3 - to separate the back cover and to smear the plumes. Metal tools can scratch the body.
• 🔨 Cross screwdriver PH00 — for the motherboard screws. 7A Small screws are used, so the screwdriver must be accurate.
• 🧲 Magnetic mat or container, so you don't lose the screws, and there's about 15 of them in the device, all of them of different sizes.
• 🔥 A hair dryer or a thermo-air station to soften the glue under the back cover. Temperature should not exceed 80.°C, or the plastic will be damaged.
• 🔋 Capron tape or tape – to fix the disconnected battery to avoid accidental contact.

Also, prepare the workspace: it should be well lit, free of dust and static electricity. Put a soft substrate on the table (like a silicone mat) so that the screen doesn't scratch. If you're disassembling the phone for the first time, take a picture of each step, which will help you put it back together properly.

⚠️ Please note: Never take down Redmi. 7A Even if the phone is turned off, the battery remains energized. Short circuits can cause fire.

If you're planning to replace the battery, buy the adhesive strips for the new battery in advance. Xiaomi's original version uses high-strength double-sided tape, which is difficult to remove without residues. The alternative is liquid adhesive B-7000, but it needs to be applied in a thin layer.

Removing the back cover: how not to damage the latches

The Redmi 7A back panel is attached to glue and plastic latches. To remove it, you need to heat the body evenly around the perimeter. Use a hair dryer at minimum power, holding it 10-15 cm from the phone. Heat the cover for 2-3 minutes, paying special attention to the corners, where the glue holds stronger.

After heating, insert a plastic blade into the gap between the lid and the screen frame. Start at the bottom edge (near the Micro-USB connector), as there is less risk of damaging the plumes. Carefully drive the blade along the body, alternately cracking the clamps. Don't put too much effort — if the lid doesn't lend itself, heat it again.

When the lid is detached, don't remove it completely, it's connected to the fingerprint scanner plume (if your model is equipped with one), gently lift the lid and unplug the plume with a blade, the mounting location usually marked with a white or yellow tag on the motherboard.

⚠️ Warning: If you see signs of corrosion or oxidation on the battery contacts after removing the lid, don't turn on your phone! This is a sign of moisture. First, dry the rice or silica gel for 24 to 48 hours.

At this point, you can assess the state of the battery, and if it swells (as seen from the deformation of the lid), it needs to be replaced, further disassembly of the battery is dangerous, and also check the integrity of the antenna tapes (black stripes on the edges of the housing), their damage degrades the network signal.

Battery shutdown: Why it's critical

Before any manipulation of the internal components, be sure to turn off the battery. In the Redmi 7A, it is connected through a connector on the motherboard, which is closed with a black insulation tape. Carefully remove the tape with tweezers or nails, then slap the connector with a plastic blade.

The battery connector in the Redmi 7A is fragile, easily damaged by a metal tool, if the contacts bend, the phone will not charge. After shutdown, lock the battery with tape so that it does not touch the board, which will prevent accidental circuits during further disassembly.

If the battery is glued too tightly and does not separate from the body, do not try to tear it off by force. Inside it may be a traction cord (orange or black loop) that you need to pull to loosen the glue. If the cord is not, gently tuck the battery into a plastic card, preheating it with a hairdryer.

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If the battery doesn't shut down because of corrosion on the connector, don't try to rip it out. Treat the contacts with alcohol and clean them gently with a wooden toothpick.

Dismantling the motherboard and child modules

Once the battery is turned off, you can start removing the motherboard, which is mounted on 12-14 screws of different sizes (the Redmi 7A uses PH00 screws 3-5 mm long). Remember or photograph the location of each screw - when assembled, they are easily confused, which will lead to damage to the board.

Unscrew all the screws and gently raise the board with a spatula. It's connected to the body with several plumes:

• 📱 Display plume (wide, at the top).
• 🔊 The plume of the speaker and microphone (thin, at the bottom).
• 📷 Main camera plume (if not integrated into board).

Disconnect them one by one, starting with the display. Don't pull the plumes, they're fragile and they can break.

If the board doesn't separate, check if there are any undetected screws left under the stickers or near the connectors. 7A often forget about the screw under SIM-It's also a tray, hidden under a metal plate, and it can stick to the heat paste on the processor, in which case you can gently shovel it with a spatula.

After the charge is withdrawn, you will have access to the remaining components:

• 🔋 Vibromotor - is attached to two screws at the lower edge.
• 📞 Antenna modules – glued to the back cover (caution, they are fragile!).
• 🔊 The speaker and microphone are fixed on a metal frame.

To replace the camera or speaker, it is enough to disconnect their plumes, but to repair the Micro-USB connector, you will have to completely dismantle the lower part of the body.

Screen Disassembly: When It Is Needed

In most cases, you don't need to disassemble the Redmi 7A screen, because it's attached to a frame with glue and double-sided tape, but if you need to replace the touchscreen, the display module or the plume, you have to separate it from the body, which is the most difficult step, because there is a high risk of damage to the flexible cables.

The process includes the following steps:

1. Heat the screen with a hair dryer around the perimeter (temperature - 70-80 ° C).
2. Insert a plastic spatula into the gap between the screen and the frame (start at the bottom corner).
3. Carefully drive the blade along the edge, separating the glue. Do not go more than 2 mm deep - the plumes pass inside.
4. When the screen separates, lift it and disconnect the display plumes and touchscreen.

⚠️ Attention: At Redmi 7A The touchscreen and the display are combined into a single connector, but they are separate tracks, and if you damage any of them, the screen will not respond to touch or display the image.

If the screen is cracked but the image is displayed, it can be temporarily used with tape, but when disassembling the glass can crumble — work with gloves and safety glasses. To replace the screen, you will need special glue LOCA and UV lamp for polymerization.

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Replacing the Redmi 7A screen without experience is best left to professionals, with the new module costing 30-50% of the phone’s price, and an error in installation can cause the device to fail.

Phone Assembly: How to Avoid Mistakes

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

• 🔧 Screw them cross-curl them so that the boards sit evenly!
• 🔋 Battery - check the voltage with a multimeter before connecting (it should be 3.7–4.2V).
• 📱 Trains -- make sure they're firmly seated in the connectors. Sometimes a little finger pressing helps.

Before final assembly, turn the phone on in disassembled state (without the cover) to check the performance:

1. Connect the battery and press the power button.
2. Check the response to touch, camera and speaker.
3. If everything works, turn off the phone and complete the assembly.

When installing the back cover, use a new glue or double-sided tape. In Redmi 7A, the original adhesive often loses its properties after the first opening. The alternative is T7000 glue, but you need to apply it in a thin layer, otherwise the cover will "walk."

After assembly, check the tightness of the case, if there are gaps between the lid and the frame, this can lead to dust or moisture, in which case, disassemble the phone and re-add the lid.

Frequent Mistakes and How to Avoid Them

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

Another common problem is that the power button is broken after assembly, and this happens when the button plume (which comes with the volume plume) is not tightly attached to the connector, so to fix it, take the phone apart and check the connection, sometimes with a light tweezer press.

If the phone does not turn on after assembly, but the battery is charged (the indicator burns), the problem may be:

• 🔌 Unconnected display plume.
• 🔋 Faulty battery (check voltage).
• 🔧 Short circuit on the board (look for blackened elements).

FAQ: Answers to popular questions