Replacement of the display on Xiaomi Mi Band 4: a detailed guide with photos and nuances

Introduction: when you need a screen replacement and whether to take it yourself

Xiaomi Mi Band 4 screen is one of the most vulnerable spots of the bracelet: falling from a height, severe pressure or even prolonged exposure to moisture (despite the declared standard of protection). IP68) If your bracelet has stopped responding to touch, shows artifacts or doesn't turn on at all, 80 percent of the time it's the screen module that's to blame.

The cost of replacement in the service center often reaches the 70-80% The price of the new Mi Band 4, So many users are willing to do their own repairs, but there are pitfalls: careless disassembly can damage the plumes, and improper soldering of contacts can disable the control board. In this article, we will discuss all the stages of replacement – from the selection of a spare part to testing after repair, taking into account typical errors and ways to avoid them.

If you have never held a soldering iron in your hands or disassembled electronics smaller than a smartphone, it is better to entrust repair to professionals. For the rest, our guide will become a step-by-step instruction with photos, tips for choosing tools and unique life hacks that are not found in standard manuals (for example, how to restore the performance of the bracelet if it does not turn on after replacing the display).

Signs of Display Failure: How to Detect the Problem

Before you disassemble the Mi Band 4, make sure the screen is the problem, and sometimes other malfunctions, from a dead battery to damage to the main board, cause similar symptoms.

• 🔴 Cracks or chips on the screen surface (even if the touchscreen is still working).
• 🖥️ Image artifacts: vertical/horizontal stripes, broken pixels, flickering.
• 👆 The sensor is not working (the bracelet vibrates but does not respond to touch).
• 💥 The screen does not turn on, although the bracelet charges and vibrates when connected to charging.
• 🌡️ Spontaneous taps or “ghost” swipes (often associated with damage to the sensory layer).

If the bracelet doesn't show any signs of life at all (it doesn't vibrate, it doesn't charge), the problem might be the battery or the power controller, in which case replacing the display won't help. To rule out other malfunctions, try:

1. Connect Mi Band 4 to 30 charger+ Minutes – sometimes a discharged battery blocks the switch on.
2. Reset the bracelet to factory settings through the Mi Fit app (if it reacts at least somehow).
3. Call the battery contacts with the tester (voltage should be ~3.7–4.2V).

⚠️ Warning: If the bracelet fell into water or was subjected to severe humidity, be sure to dry the charge in rice or silica gel 24 before replacing the display.+ Otherwise, a short circuit could knock out a new screen.

Selection of the display to replace: original vs. analogues

Part quality is 90% of the success of the repair, and there are three types of displays available for Xiaomi Mi Band 4:

Where to buy:

• 🛒 AliExpress is cheap, but it's a long wait (3-6 weeks%+ and photo reviews.
• 🏬 Local service centers are original parts, but the price is higher than the market.
• 🌍 Overseas sites (e.g. eBay, Banggood) – average prices, delivery 2-3 weeks.

When choosing, pay attention to:

• 🔍 Display model: should be listed as Xiaomi Mi Band 4 AMOLED Display + Touch Panel (do not separate screen without sensor!).
• 📦 Set: Ideally, it should come with adhesive tape and protective film.
• 📸 Photo of the real product in reviews - check that the display was free of scratches and defects.

⚠️ Note: Some vendors give displays from Mi Band 5/6 spare parts 4-They're not compatible in terms of connectors and sizes, make sure the description says Mi Band. 4 (XMSH08HM).

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Before buying, ask the seller for a video display test, which will help to avoid marriage (broken pixels, non-working touchscreen).

Required tools: what you need to replace

To replace the Xiaomi Mi Band 4 display, you’ll need a minimal set of tools, but some are critical.

Screwdriver. T4 (torex) for shell screws|Plastic mediator or guitar mediator for disassembly|Thin-ended tweezers|A soldering iron with a thin sting (0.5-1 mm) and solder|Flux (preferably without washing, for example, RMA-223)|Thermo-air station or hair dryer (optional, for display removal)|Isopropyl alcohol (90%+) clean-up|Double-sided tape or adhesive tape to fix a new display|loope USB-microscope (for soldering small contacts)-->

Pay special attention to the soldering iron:

• 🔥 Power: 30-60 W (too powerful will overheat the board).
• 🔧 Sting: needle or conical (diameter not more than 1 mm).
• 🌡️ Temperature: 300-350°C (above - risk of lanes being detached).

If you don't have soldering experience, practice on an unnecessary board. The contacts on the Mi Band 4 display are extremely small, and one careless movement can damage them. The alternative to soldering is to use conductive glue (like Loctite 3880), but it is less reliable.

Also prepare the workplace:

• 🪑 Table with good lighting (preferably a lamp with an increase).
• 🧲 Antistatic mat or at least metal sheet to protect against statics.
• 📦 Containers for screws and small parts (so as not to lose).

Step-by-step: disassembling the bracelet and replacing the display

Now, to the process itself, follow the instructions in strict order to avoid damage.

Step 1: Removal of the capsule from the body

1. Remove the strap from the bracelet by pulling it away from the body.

2. Find two latches on the back of the capsule (near the charging contacts). Carefully put them in a plastic mediator as you move around. Don't use metal tools - they will scratch the body!

3. When the latches are snapped, remove the back cover, and underneath that you'll see the battery and the board.

Step 2: Shutting off the battery

⚠️ This is the most dangerous stage! The battery in the Mi Band 4 is soldered to the board, and its break can lead to a short circuit.

1.Pour off the red (+) And the black (-) wires of the battery. Use flux and the minimum soldering iron temperature.

2. After welding, isolate the battery contacts with captone tape to avoid circuiting.

Step 3: Removing the old display

1. The display is attached to the board with double-sided tape and soldered contacts. Heat it with a hair dryer (temperature). ~80°C) 1-2 minutes to soften the glue.

2. Gently tuck the display with a plastic card or a mediator. Start at the angle where there is no plume.

3. When the display separates, you will see a flexible plume with 6-8 contacts. solder it off or gently cut it (if the display is completely non-functional).

Step 4: Install a new display

1. Clean the contact area on the board with isopropyl alcohol.

2. Attach a new display and combine contacts. Secure it with double-sided tape (you can use the remnants of the old one).

3. solder the plume of the new display. Use a minimum of solder - excess can close adjacent contacts.

4. check with the multimeter that there is no short circuit between the contacts.

Step 5: Build the bracelet

1. solder the battery back (observe polarity!).

2. Put the board in the case and snap the back cover. Make sure the charging contacts are not bent.

3. Put on a strap and check the performance.

1.Solding quality of the display contacts (call the tester).

Battery polarity (red — "+", black — "–").

3. Integrity of flexible plume (sometimes damaged during installation).-->

Post-Replacement Testing: What to Check First

After assembly, take your time to rejoice, you need to thoroughly test the bracelet.

• 🔋 Charging: connect the bracelet to the charger. The battery icon should appear.
• 🖥️ Display: check for no broken pixels, uniformity of backlight, response to bright light (autoradjustment).
• 👆 Touchscreen: Test swipes up/down/left/right, touches on the edges of the screen.
• 📶 Synchronization: connect the bracelet to the Mi Fit and check the data transfer (steps, pulse).
• 💧 Waterproof: If you have used glue, do not wet the bracelet for 24 hours).

If something is not working properly:

• The screen flickers or goes out → Bad plume contact, re-drink.
• Touchscreen doesn't respond to touch → Check the integrity of the sensor layer or re-flash the bracelet.
• Bracelet discharges quickly → The battery may have been damaged during the rationing.

⚠️ Warning: If the bracelet gets overheated after you change the display, immediately disconnect it from charging! This is a sign of a short circuit on the board. Disassemble the bracelet and check the soldering of the contacts.

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To calibrate the touchscreen after replacing the display, go to Settings → Additionally. → Screen calibration (if such a point is in your firmware).

Common Mistakes and How to Avoid Them

Even experienced wizards sometimes make mistakes when replacing the display Xiaomi Mi Band 4. Here are the most common of them and ways to prevent them:

If you've already made one of these mistakes, don't panic. In most cases, you can fix the situation:

• 🔥 Lanes detached → Restore them with conductive varnish (e.g. Contac Cafe).
• 🔌 Closed contacts → Clean them with alcohol and re-drink them.
• 🔋 Faulty battery → replace it (worth it). ~300–500 ₽).

If the bracelet still doesn't work, it's probably a firmware problem. Try reflashing it through Mi Fit or special utilities (for example, Mi Band 4 Tools).

FAQ: Answers to Frequent Questions