How to disassemble Xiaomi Redmi 3S: detailed instructions with nuances and warnings

Xiaomi Redmi 3S

In this article, you will find a step-by-step manual for disassembling the Redmi 3S, taking into account its design features, which tools you will need, how to avoid typical errors, and what to do if something goes wrong. Importantly, if you have never disassembled a smartphone, you should practice on a non-functional device or consult a specialist - some elements (such as plumes) are extremely fragile.

Preparation for disassembly: tools and security measures

Before you start disassembling, make sure you have everything you need, the wrong tool can damage the body or internal components, and the lack of antistatic protection can disable the chips.

Minimum set for disassembling Xiaomi Redmi 3S:

• 🔧 Plastic blade (or mediator) - to separate the back cover.
• ⚙️ The screwdriver (PH00 or PH0) — hull-rotor.
• 🧲 Magnetic mat or container – so as not to lose screws.
• 🔥 Hair dryer or thermo-air station - for softening the glue (optional).
• 📱 Suction - will help to suction the screen (if you need a deep disassembly).
• 🛡️ Antistatic bracelet – to protect against static electricity.

Also, prepare the workspace: it should be well lit, free of dust and moisture. Put the phone on a soft surface (such as a napkin) so as not to scratch the screen. If you disassemble the phone to replace the battery, charge it up to 30-50% in advance - a fully discharged or 100% charged battery can be dangerous if mechanically exposed.

⚠️ Warning: If the phone has been in water or has been subjected to severe vibration (for example, after a fall), disassembly may lead to a short circuit, in which case it is better to first dry the device in rice or silica gel for at least 48 hours.

Step 1: Removing the back cover

The Redmi 3S back cover is mounted on latches and glue, so you need to remove it carefully so as not to break the plastic locks. Start by heating the edge with a hairdryer (temperature no higher than 60 ° C) - this will soften the glue and facilitate the process.

Procedure:

1. Turn off the phone and remove the tray for SIM-map.
2. Blow the hair dryer around the perimeter of the cover for 1-2 minutes.
3. Insert a plastic blade into the gap between the lid and the body (start at the lower corner where the charging connector is located).
4. Carefully lead the shoulder blade along the edge, alternately snapping the clamps.

If the lid doesn't work, don't put too much effort into it -- you better warm up the glue again. Don't use metal tools to keep the case from scratching. Once you remove the lid, you'll see the battery, the motherboard and the camera.

I warmed up the edge with a hairdryer |

Using a plastic spatula |

Starting at the bottom corner |

No use of force.|

Put the screws in the container.-->

⚠️ Note: Some versions of Redmi 3S There may be an extra protective film under the lid. Don't unnecessarily remove it, because it prevents dust from entering the board.

Step 2: Battery disconnection

The battery in the Redmi 3S is glued to the body, and it requires care to remove it. Never tear the battery by force - it can damage it or the board; It is better to use special plastic cards or thread for neat tweaking.

Instructions:

1. Unplug the protective film (if any) from the battery.
2. Find the plume connecting the battery to the board, and gently disconnect it (you can spoon it).
3. Tap the battery from one edge and slowly pull up, placing cards under it for even separation.

If the battery is swelling, do not try to pierce or bend it, this can lead to fire, in which case it is better to contact the service center.

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If you are planning to replace the battery, choose the original battery or a quality analogue (for example, from Baseus or Remax). Cheap fakes can quickly fail or damage the board.

Step 3: Removing the motherboard

The Redmi 3S motherboard is mounted with multiple screws and connected to other components through plumes, and must be retrieved by:

• 📸 Disconnect camera plumes, speaker and power buttons.
• 🔌 Disable the display connector (if full disassembly is required).
• 🔧 Unscrew all screws (usually 6-8 pieces).

Then you can gently push the board over the edge, don't pull it around the corners, it can damage the soldered contacts, if the board is stuck to the heat sink, sway it slightly from side to side.

Notice the metal screen above the board, which protects the components from interference, and when you build it, remember to put it back in, or you may have problems with communication or Wi-Fi.

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If you are disassembling the phone for board repair (for example, after getting moisture), be sure to clean it with isopropyl alcohol and dry it for at least 24 hours before assembly.

Step 4: Disassemble the screen (if necessary)

If you need to replace the display or touchscreen, you need to completely disassemble the front panel, which is the most difficult step, since the Redmi 3S screen is glued to the frame and connected to the board through a fragile plume.

Algorithm of action:

1. Warm up the screen with a hair dryer (temperature 70-80 ° C) for 3-5 minutes.
2. With a suction cup, lift the screen from one edge and insert the spatula.
3. With a mediator, carefully separate the screen from the body, moving around the perimeter.
4. Disconnect the display plume and touchscreen from the board.

If the screen is cracked, wear gloves – the shrapnel can hurt your hands. Use the original module (including display + touchscreen + frame) to replace it, as a separate glass replacement often leads to sensor problems.

⚠️ Warning: When disassembling the screen, don't push the center, it can damage the matrix. It's better to start at the corners where the glue is usually weaker.

Step 5: Replace other components

Depending on the purpose of the disassembly, you may need access to other details:

• 🔊 Speaker and microphone: attached to glue or latches, the plumes are disconnected like a battery.
• 📷 Camera: screwed, the plume is short - do not overflex it.
• 🔋 Power/volume button: often broken when unassembled. replaced entirely.
• 📶 Antenna modules: glued to the back cover, check the integrity of the contacts when replacing.

If you're replacing a charging connector, be careful, it's soldered to the board, and you'll need a soldering station to repair it, and it's hard to do that at home, so you'd better go to the service.

To clean the connectors (for example, from oxidation), use WD-40 or isopropyl alcohol, but do not overdo it - the liquid should not fall on the board.

Build the phone: reverse order and check

To assemble Xiaomi Redmi 3S need in reverse order, following several rules:

• 🔄 Make sure all plumes are tightly connected (they should click).
• 🔧 Twisting the screws cross-cross to avoid skewing the fee.
• 🧹 Before closing the cover, remove dust from the internal components.
• 🔋 When you first charge after replacing the battery, use the original adapter.

Turn on the phone and check all the functions. If the device doesn't turn on, disassemble it again and check:

• Connecting the battery plume.
• Contact integrity on the board.
• Correct installation of the power button.

If there are problems, it is possible that one of the components was damaged during the dismantling, in which case the diagnosis at the service center is mandatory.

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Once assembled successfully, let the phone run for 10 to 15 minutes as normal, and if it gets hotter than usual, disassemble it and check the circuit board's heat sink.

FAQ: Frequent questions about the dismantling of Xiaomi Redmi 3S