Disassembly Xiaomi Redmi 9A: a complete guide to repair your own hands

Introduction

The Xiaomi Redmi 9A may need to be disassembled to replace the battery, repair the display, or clean the internal components from dust. Although it is a budget model, its design has a number of features that are important to consider when disassembling. Unlike flagship devices, it uses simpler mounts, but this does not make the process less responsible.

If you’ve never taken a smartphone apart before, start by learning the structure of the case and the layout of the interiors. The Redmi 9A has a non-removable battery soldered to the motherboard with plumes, as well as fragile flexible cables that can be easily damaged if handled carelessly, which will help avoid typical errors and disassemble as safely as possible.

Preparation for disassembly: tools and security measures

Before you start disassembling, make sure you have all the tools you need, and without them, the process can result in damage to the body or internal components.

• 🔧 Plastic blades (2-3 (p) for the rear cover separation
• 🔨 The screwdriver (PH00 or PH0) screw
• 🧲 Magnetic mat or screw container
• 🔥 Hair dryer or thermo-air station (for softening glue)
• 📱 Suction (optional, for ease of removal of the cover)

Also, prepare your workspace: it should be clean, well-lit and free of static electricity. Use an antistatic bracelet or periodically touch grounded metal objects to avoid damage to the chips by a discharge.

⚠️ Note: If the smartphone battery is swelling, do not try to disassemble the device yourself - the risk of fire or explosion is extremely high.

Step 1: Removing the back cover

The back cover of the Xiaomi Redmi 9A is attached to glue and latches. To remove it, you need to heat the body evenly around the perimeter. Use a hair dryer at minimum power (temperature not higher than 60-70 ° C) to avoid damaging the plastic. Heat the cover for 2-3 minutes, then try to tamper with a plastic blade.

Start at the bottom edge, where the charging jacks and headphones are located. Carefully swipe along the seam, gradually detaching the lid. If you feel resistance, don't force it, you'd better warm up the problem area again. Once the lid starts to move away, don't remove it completely: under it are the fingerprint scanner plumes (if you have one in your modification) and antenna wires.

Is the smartphone off the power supply?|Is it cut? SIM-memory-card?|Are plastic shoulder blades and suction cups ready?|Is the lid heated all over the perimeter?-->

Step 2: Shutting off the battery

When the lid is removed, the first thing you need to do is disconnect the battery, which prevents short circuits from being taken apart further, and on the Redmi 9A motherboard, the battery connector is located at the top (closer to the camera), and it's locked in a small latch that needs to be gently lifted with a plastic blade or nail.

If the latch breaks, it's not critical -- the battery can be soldered off, but it's best to avoid unnecessary damage. After you turn off the battery, check with a multimeter that there's no voltage on the contacts (if you have experience with electronics), which is an additional insurance against accidentally turning on the device during repairs.

⚠️ Warning: Never use metal tools to disconnect the plumes - this can lead to the closure of contacts on the board and the failure of the smartphone.

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If the battery latch is tight, moisten it with alcohol or WD-40 - this will facilitate the detachment process.

Step 3: Removing the motherboard

The Redmi 9A motherboard is mounted to the middle frame with several screws (usually 8-10 screws), all of which are of different lengths, so remember or photograph their location before extraction. Use a magnetic screwdriver to keep the screws from getting lost.

After you unscrew the screws, you need to gently raise the board on one side, and it's connected to the body by a few plumes.

• 📷 Main camera plume
• 🔊 Dynamics and microphone plume
• 📶 Antenna wires (can be glued)

Disconnect them one by one, starting with the camera. If the plume doesn't respond, don't pull it, check if there are any additional latches.

Step 4: Replace the battery (if required)

The battery in Xiaomi Redmi 9A is glued to the body with double-sided tape. To remove it, pull a special black tape (pull-tab) located under the battery. If the tape is not available or it has come off, use a plastic blade to gently tamper with the battery on the side.

The new battery should have the same capacity (5000 mAh) and similar connectors. Before installation, clean the contacts with alcohol and make sure they are not bent, 3M 9448A) And you can connect the plume to the board. Don't turn on the phone right after you've replaced it, let the glue grab (10-15 minute).

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When replacing the battery, be sure to check its voltage with a multimeter before installing. The normal value is 3.7-4.2 V. If the voltage is below 3.5 V, the battery may be faulty.

Step 5: Build a Smartphone

The assembly is carried out in reverse order, but with some nuances:

1. Make sure all plumes are tightly connected and the latches are closed.
2. Check if there are any screws or small details left on the table.
3. When installing the back cover, warm it with a hair dryer so that the glue is better grasped.
4. After assembly, turn on the smartphone and check all the functions: camera, speaker, sensors.

If the Redmi 9A is not turned on after assembly, check:

• 🔋 Battery connection (possibly the plume is not fully inserted)
• 🔌 Power button contacts (may be contaminated or bent)
• 📱 Integrity of the motherboard (visually inspect for damage)

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling the Xiaomi Redmi 9A. Here are the most common of them:

• 🔧 Shooting screws - use a high-quality screwdriver and do not apply excessive force.
• 🔥 Overheating of plastic - the hair dryer should be at minimum power, and the heating is uniform.
• 📱 Damage to plumes - never pull them, only carefully pull the latches.
• 🔋 Short circuit – before working with the board, turn off the battery and discharge static electricity.

If you have damaged the plume or connector, do not panic. Most parts for the Redmi 9A can be found on AliExpress or in specialized stores. For example, the display plume costs about 200-400 rubles., and the new battery - 800-1200 rubles.

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If the touchscreen stopped working after disassembly, it's likely that the display plume has gone away or the motherboard has been damaged, and 80 percent of the time, reconnecting the plume helps.

FAQ: Answers to Frequent Questions