How to change the screen on Xiaomi Mi Band 4: disassembly, replacement and assembly

Why the Mi Band 4 screen fails and when to replace it

The Xiaomi Mi Band 4 screen is one of the most vulnerable parts of the device. Despite its 5ATM claimed protection against dust and moisture, the display often suffers from mechanical damage, liquid falling under glass or factory defects. Typical symptoms of malfunction: vertical stripes, flickering, lack of response to touch or complete shutdown of the backlight. In 80% of cases, the problem is solved only by replacing the screen module.

Self-repairing is 3-5 times cheaper than a service center, but requires care. The main difficulty is to disconnect the adhesive layer between the body and the display without damaging the plume. If you haven't previously done microelectronics, practice on an off-the-shelf bracelet or watch video disassembly. In this article, a step-by-step algorithm with photos, a list of tools and typical beginner errors.

What tools will be needed to replace

You don't need professional gear to disassemble the Mi Band 4, but without specialized tools, the risk of damage to the board or plume increases significantly.

• 🔧 Plastic mediators (2-3 pieces) - for neat tweaking of the case. Metal blades scratch the plastic.
• 🔥 Dryer or thermo-air station - heating to 60-80°C softens the glue, even a household hair dryer at minimum power will do.
• 🧲 Magnetic screwdriver. T3 — for spinning two battery attachment screws.
• 📱 Suction cups (2 pcs) - help to evenly raise the screen after heating. 20-30 mm diameter.
• 🧴 Isopropyl alcohol (90%+) — Acetone or solvent will damage the plastic!
• 🔌 Tweezers with curved ends - for working with plumes and small details.

Additionally, you will need an antistatic mat (or at least a metal surface) to avoid static discharge, and a backlit magnifier - the plumes on the Mi Band 4 board are thinner than hair. If you plan to use the bracelet after repair in water, stock up with a LOCTITE 577 sealant to restore moisture protection.

Step-by-step: how to remove the old screen

Start by completely discharging the bracelet, which will reduce the risk of short circuits when working with the board.

1. Heat the body. Put the bracelet up on a flat surface. Heat the hair dryer around the perimeter of the display for 2-3 minutes, holding the nozzle at a distance of 5-7 cm. The glue should become elastic, but not melt.
2. Screen separation. Stick the suction cups to the top and bottom of the display. Pull up carefully while putting the body on with a plastic mediator. If the screen doesn't respond, repeat the heat.
3. Turn off the plume. When you take off the display, you'll see a thin white plume connecting the screen to the board, tweez it on the side (not up!) and gently pull it out of the connector.

Attention: the plume is attached to the board without locks, it is easy to pull out randomly. If the contacts are bent, straighten them with a needle under the magnifier. At this stage, check the integrity of the flexible board: cracks or tears mean that a new plume is needed (article MB4-DISP-CABLE).

Installation of a new screen: nuances and typical errors

Before installing the new display, clean the case of glue residues with isopropyl alcohol. Do not use abrasive materials - they scratch the plastic and worsen the leakiness. The new screen (the original article XMSH07HM) should go with adhesive tape around the perimeter. If not, buy separately a double-sided 3M 467MP tape with a thickness of 0.1 mm.

Assembly algorithm:

1. Stick a new plume to the screen (if it's not assembled) and use a heat-glue or a drop of super-glue on the base.
2. Connect the plume to the board. Make sure the contacts match, the skewed connection leads to artifacts on the display.
3. Place the screen on the body, align the charger connector, and press it evenly, starting at the center.
4. Place the bracelet under a press (such as a stack of books) for 10 to 12 hours to polymerize the glue.

Critical error: 60% of the breakages after self-replacement are associated with the compression of the plume. If after assembly the screen flashes or does not respond to touch, disassemble the bracelet and check if the plume under the battery is bent.

How to Restore Water Protection After Replacement

The Mi Band 4's factory sealing is provided by adhesives and rubber pads, and you have to re-seal it by hand after disassembly.

1. Apply a thin layer of LOCTITE 577 sealant around the perimeter of the body under the screen. Avoid hitting the speaker or touch button.
2. Check the integrity of the rubber gasket around the charging socket. Replace it if damaged (MB4-GASKET).
3. After assembly, place the bracelet in a plastic bag with silica gel for 24 hours - this will remove the residual moisture.

⚠️ Warning: Without sealing, the bracelet will lose water protection after 2-3 showers. Test for moisture protection no earlier than 48 hours after repair: lower the bracelet in warm water for 10 seconds and check the screen for condensation inside.

Where to buy parts for Mi Band 4 and how not to run into a fake

The original screens for the Mi Band 4 are manufactured in Huami factories (the article begins with XMSH).

• 🏷️ Holographic sticker on the back with serial number.
• 🔍 Clear font printing on the plume (for fakes, the letters are blurred).
• 📦 Factory packaging – antistatic package with the Xiaomi logo.

Checked areas for purchase:

• 🌍 AliExpress – Look for sellers with a 98 rating%+ Average screen price: 800-1200 rubles.
• 🛒 Beru/Yandex Market - filter by the "Original" option (1500–2000 RUB.), but less risk of forgery.
• 🔧 Local service centers - sometimes sell used parts with a guarantee. Cost: 500-900 rubles.

⚠️ Note: Fake screens often have inverted colors or incorrect sensor calibration. Before buying, ask the seller for a video display test (for example, scrolling through the menu).

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Before ordering, check the compatibility of the screen item with your version of the Mi Band 4. The models for the Chinese market (article XMSH07HM-CN) plume connector may differ!

Frequent problems after replacement and how to fix them

Even with careful repairs, there are possible failures, and here are the typical symptoms and their causes:

If the bracelet does not turn on at all, connect it to charging for 30 minutes - sometimes the settings of the power controller are confused. To reset the settings to the factory, hold the touch button for 10 seconds (before vibration).

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90% of the problems after a screen change are due to the plume or its connection. Always test the bracelet before the final assembly of the case!

FAQ: Answers to Frequent Questions