How to check the status of Xiaomi devices: from battery to iron

Xiaomi devices – from budget Redmi to flagship Mi and POCO — They're known for their value for money, but even the most reliable technology can fail over time, with the battery running out, the system slowing down, the processor overheating, or the sensors failing. Checking the condition helps to identify problems at an early stage, avoid expensive repairs or deception when buying a used gadget.

In this article, we’ll look at all the ways Xiaomi devices are diagnosed, from hidden engineering menus to third-party apps, and learn how to check the battery, screen, camera, speakers, sensors, and even hardware (processor, memory, communication modules). Instructions are suitable for smartphones, tablets, Mi TVs TV And if you're planning to buy a used watch, you'll find unique life hacks here, so you don't run into a drowned person or a phone with a swapped motherboard.

1. Quick status check through system settings

Start with basic diagnostics that don’t require third-party apps to be installed. Xiaomi’s menu has a few useful tools hidden in it:

• 🔋 Battery status: Go to Settings → Battery → Battery status: This shows wear level (if supported by the model) and temperature; normal wear up to 20%; excess of 30% means that the battery needs to be replaced.
• 📱 Device Information: Settings → The phone. → Version. MIUI. Check Uptime – If the device often reboots on its own, it’s a sign of firmware or hardware problems.
• 📊 Memory usage: Settings → Memory. If less than 10 percent of the total is free, the system will slow down. Clear the cache or transfer the files to the memory card.

Please note the Special Opportunities section → Diagnostics (not available on all models) You can test the touch screen, speakers, microphone and vibrator without additional software, for example, the screen color test will show broken pixels, and Sound will show problems with speakers.

⚠️ Warning: If the About Phone section shows Root status: Yes, it means the device has been unlocked. MIUI.

2. Hidden engineering codes for deep diagnostics

Xiaomi, like other manufacturers, hides the diagnostic menu for the first time. USSD-These commands allow you to get data that is not available through standard settings. Enter it in the Phone application (as a normal number):

For example, the code ##4636## will open a tabbed menu:

• Battery information: will show Charge Level, Temperature, Voltage and Technology (Li-ion/Li-poly). Normal tension — 3.7–4.2 V.
• Usage statistics: screen time, number of app launches. If you can see here, the phone's up 500.+ Watches without recharging are a sign of data spoofing (possibly fraud in the sale of goods).

For Mi TVs, TV There is a set of commands that are entered from the remote:

Click sequentially: Menu → Settings → All Settings → Support → Device Preferences → About → Press 5 times on “Regulatory Info”

This will open a service menu where you can check:

• 📺 The panel's working time (in hours) is up to 30,000 hours.
• 🔊 State of speakers (test of sound at different frequencies).
• 📡 Signal level Wi-Fi/Bluetooth (useful for diagnosing connection problems).

Battery check: wear, charging cycles and real capacity

The battery is the most consumable component in a smartphone, and even if the phone is turned on and running, it can be critical.

1. Through the settings MIUI: Settings → Battery → Battery status: If partition is missing, use the code ##4636## (Battery information tab).
2. AccuBattery (Play Market): shows battery health as a percentage, number of charging cycles and actual capacity, for example, if it was originally 5,000 mAh and now 3800 mAh, it's 24% wear.

Pay attention to the temperature of the battery:

• ❄️ 10 below°C – can cause a sudden shutdown (especially relevant for Redmi Note in the cold).

The phone turns off when 20-30% charge|Charging jumps (for example, with 50% on 20%)|Bloating of the body (seen from the raised screen)|Heating when charging to 50°C+-->

⚠️ Note: If AccuBattery shows Health: 0% or No data, it may mean that the battery was replaced with a non-original.

4. Screen Diagnostics: Broken Pixels, Backlight, Sensor

The screen is the second most expensive component after the motherboard.

• 🖥️ Broken pixels: use the ##0*## code or the Screen Test app. Carefully examine the screen in uniform colors (red, green, blue, black). White dots are dead pixels, colored dots are hanging».
• 💡 Backlight: In a dark room, turn on a white screen (for example, in Google Keep, create a new note). Uneven backlighting (yellow spots, dimming at the edges) is a sign of wear on the matrix.
• ☝️ Multitouch: In the engineering menu (##6484##) check how many fingers the screen recognizes at the same time.
• 🔄 Oleophobic coating: swipe across the screen if there are greasy marks that are difficult to erase, the coating is erased (relevant for phones over 2 years old).

For Mi TVs, TV Use YouTube test videos (search for "Mi" TV screen test:

• 🎨 Color rendering: gray gradations should not "stick together" (a sign of bitiness of the matrix).
• 🔍 Blurrency: Texts in static frames should be clear (if not, a matrix or plume problem).

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To check the screen on Xiaomi with AMOLED-a matrix (e.g. Mi 11 or POCO F3) Use Always-on Display mode. Turn it on for 10 minutes — if artifacts (shimmering, stripes) appear, this is a sign of burning out organic LEDs.

5. Testing of hardware: processor, memory, communication modules

If the phone brakes, overheats or suddenly turns off, the problem may be in the processor, RAM or communication modules.

1. Annex CPU Throttling Test: checks if the processor is reducing the frequency due to overheating. If the test shows Throttling detected, you need to change the thermal paste or clean the dust.
2. AIDA64 DevCheck: Shows detailed information about the processor, GPU, Compare the metrics with the references for your model (for example, the Snapdragon 8 Gen 2 in Xiaomi 13 Pro should give you a ~1200–1500 in the Geekbench single-core test).
3. Memory test: in AIDA64 Go to Memory and run Test Memory. Read/write errors (Read/Write Errors indicate problems with RAM.

To check communication modules (Wi-Fi, Bluetooth, GPS, NFC):

• 📶 Wi-Fi/Bluetooth: engineer (##4636##) Check Wi-Fi signal strength. -50 If the signal is weak even near the router, the problem is in the antenna or module.
• 📍 GPS: use GPS If satellites catch more than 30 seconds or coordinates jump, it may be damaged. GPS-module.
• 🔗 NFC: Try paying with a contactless card or reading the tag. If it doesn't work, check the settings (Settings) → Connections → NFC).

For Mi TVs, TV Xiaomi routers (such as Mi Router) 4A) Use the web interface:

Enter the address 192.168.31.1 (for routers) or 192.168.0.1 (for some TV-box models). Default Login/password: admin/admin.

In the Status or System Tools section, check:

• 📶 Wi-Fi signal level (for routers).
• 🔄 Temperature of the chipset (normal - up to 70)°C).
• 📡 Number of connected devices (if there are more than 20, lags are possible).

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If AIDA64 displays a processor model that does not match your device (e.g., Snapdragon 660 instead of Snapdragon) 720G) — It's a 100% sign of a motherboard swap!

Checking the camera, speakers and microphones

Xiaomi cameras are often praised for their value for money, but they can also fail.

• 📸 Main camera: take a photo at maximum resolution (e.g. 108 MP in Mi 11 Ultra) and zoom in. Blurrance, artifacts or "soap" - a sign of damage to the matrix or lens.
• 🔍 Autofocus: point the camera at text and tap the screen to focus. If the focus is floating or not, there's a problem with the lens motor.
• 🎥 Stabilization: Write down the video in 4K If the image twitches, it may be damaged by the gyroscope.

For the speaker and microphone test:

• 🔊 Speakers: play a test sound (for example, on YouTube, find "speaker test frequencies"). Skipping frequencies (for example, no bass) - a sign of membrane damage.
• 🎤 Microphone: record a voice memo in a recorder and listen. Noise, crackling or quiet sound is a problem with a microphone or plume.

For the Mi Band or Xiaomi Watch, check out:

• ❤️ Heart rate sensor: compare the readings to a medical pulse omometer, a difference of more than 10% is a sign of malfunction.
• 🏃 Accelerometer: Shake the clock - steps should be fixed in the Mi Fit app.

7. How to check the history of the device (whether it was repaired, drowned, unlocked)

When buying a used Xiaomi device, be sure to check its history. Fraudsters often hide:

• 🔧 Repair: Replacement of screen, battery or motherboard.
• 💦 Moisture intrusion (even if the phone is turned on, corrosion may occur later).
• 🔓 Unlock the loader (such devices do not receive) OTA-update).

Methods of verification:

1. IMEI.info service: enter IMEI on the site to find out the date of production, model and status (for example, Blacklisted means that the phone is wanted).
2. Oxidant indicators: on most Xiaomi models under the lid or in the tray SIM-cards have white stickers that turn red when moisture is ingested.

For Mi TVs, TV check:

• 📺 Serial number on the back and in the menu (Settings) → A mismatch is a sign of a change in the body or board.
• 🔧 Autopsy marks: there should be no scratches from the screwdriver on the box and back cover.

⚠️ Note: If Mi Check displays Device Unlocked status, it means that the bootloader is unlocked, such devices do not support data encryption and may have security problems.

8.Stress test: how to identify hidden defects

Some problems only show up under stress. Do a stress test to see if you have:

• 🔥 Processor overheating.
• 🔋 Sudden shutdowns at high load.
• 🎮 Artifacts on screen (strips, flickering).

Instructions:

1. Install. 3DMark or GFXBench and run the test at maximum settings (e.g. Manhattan 3.1).
2. Run it at the same time. AIDA64 and monitor the temperature in the Sensors section.
3. If the temperature of the processor exceeds 85°C, and the graphics accelerator - 75°C, this is a sign of cooling problems.

For Mi TVs, use:

• 🎬 Burnout test: turn on a static image (for example, the channel logo) for 24 hours. If there is a shadow after turning off, the matrix is burned out.
• 🔊 Test speakers at maximum volume: play low frequency (20-50 Hz) Wheezing or distortion - a sign of damage.

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If during a stress test the phone turns off when the charge is above 20%, this is a sign of critical battery wear or a malfunction of the power controller.

FAQ: Frequent questions about Xiaomi vetting