Xiaomi smartphones are known for their value for money, but even the most reliable devices can fail over time. Diagnosing a phone is the first step to identifying problems, whether it’s a draining battery, an overheating processor or broken sensors. In most cases, you can check the condition of the device yourself without the help of service centers.
In this article, we will cover all the key aspects of diagnostics, from hardware testing to software bug analysis, which tools to use (including hidden Xiaomi service menus), how to interpret test results and when to really consult a specialist.
Preparation for diagnosis: what to do before the test
Before you start testing, make sure your Xiaomi is ready for the procedure. Incorrect preparation can distort the results or even aggravate the existing problems. For example, running stress tests on a discharged battery will cause an emergency shutdown, and checking the sensors during active background processes will give false positives.
Here is the minimum checklist before starting:
Charge your phone to at least 50% |Close all background apps |Switch off mobile internet and Wi-Fi (if you don't test the network) |Make sure the device has enough free memory (at least 1 GB) |Remove the case - it can interfere with sensor checks and heat transfer-->
If you diagnose a phone after falling or getting moisture, don’t turn it on right away – let it dry for at least 24 hours (for moisture) or check the integrity of the case for cracks.
Once a month |Only when there are problems |Never checked |After every fall or hit-->
Battery check: how to assess the actual state of the battery
The battery is one of the most vulnerable components of a smartphone. Even if the phone is "normally charged," it doesn't mean that the battery is in perfect condition. Hidden wear can manifest as sudden shutdowns at 20-30% charge or prolonged charging.
There are several methods for diagnosing the battery on Xiaomi:
- 🔋 Built-in battery menu: go to Settings → Battery → Battery status: This shows the approximate wear (if supported by the model) for example, 85% means that the capacity has decreased by 15%.
- 📊 AccuBattery: Shows real capacity, temperature and discharge rate, especially useful for models without built-in diagnostics (for example, Redmi Note 8 Pro).
Notice that the battery is bloating, which is a dangerous sign! If the phone body is bulging and the screen is moving away from the frame, immediately turn off the device and do not use it until the battery is replaced. Bloated lithium-ion batteries can ignite.
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If the phone turns off at 10-15% charge, try calibrating the battery: completely discharge it before turning it off, then charge it to 100% without interruptions. Repeat the procedure 2-3 times.
3. Performance testing: CPU, GPU and RAM
Slowdowns, lags, and overheating are often associated with iron or system overload issues. To gauge Xiaomi’s performance, use a combination of built-in tools and third-party utilities.
Methods of verification:
- 📱 Hidden menu MIUI: Type in the dialer ##4636##, then select Battery Information and Usage. This displays the CPU load and real-time RAM.
Pay special attention to the temperature of the processor.
| Processor | Max. temperature under load | Crete temperature (requires cleaning) |
|---|---|---|
| Snapdragon 865/870 | 75-80°C | 85°C+ |
| Snapdragon 732G | 70-75°C | 80°C+ |
| MediaTek Helio G95 | 65-70°C | 75°C+ |
| Snapdragon 480 | 60-65°C | 70°C+ |
If the temperature exceeds the critical mark, check the thermal paste (on models with a removable back cover) or clean the system of dust. On Xiaomi with a non-shatterable body (for example, Mi 11), self-cleaning is not recommended - contact the service.
What to do if the phone overheats without loading?
4. Diagnostics of sensors: camera, gyroscope, approximations and others
Failing sensors are a common problem after crashes or firmware updates, for example, if the screen does not go out during a call, the proximity sensor is to blame, and the "jumping" horizon in the camera indicates a malfunction of the gyroscope.
How to check the sensors on Xiaomi:
- 📸 Camera: Open the camera app and check all the modules (main, wide-angle, macro). Pay attention to artifacts (strips, blur) and autofocus. OIS (optical stabilization try to record video - image shaking indicates a malfunction.
- 🔄 Gyroscope and accelerometer: Install Sensor Test from Play Market or type in engineering code ##6484### (not all models). In Gyroscope, turn your phone around, and the values should change smoothly.
On Xiaomi models with IR-Check with a blaster (like the Redmi Note 10 Pro) through the Mi Remote app. If the remote doesn't respond to commands, clean the infrared port of dust or check the integrity of its contacts.
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If the sensor stopped working after the firmware update, try rolling back to the previous version of MIUI. Often bugs are fixed in the next patches.
5. Network and communication check: Wi-Fi, mobile internet, Bluetooth
Communication problems can vary from slow internet to no network, and Xiaomi’s Wi-Fi and Bluetooth modules are most commonly affected by software failures or hardware damage to antennas.
Diagnosis by step:
- 📶 Mobile Network: Check the signal level in Settings → SIM-maps and mobile networks → Signal level: If the network is constantly switching between 4G and 3G, Try to manually set the network mode (only) 4G). On models with Dual SIM (for example, Poco X3 NFC) Check both SIM cards – sometimes one of them may not catch the network due to a damaged slot.
- 📡 Wi-Fi: Run Wi-Fi Analyzer and check the connection speed. Norm for Wi-Fi 5 (802.11ac) — 300+ Mbps close to the router. If the speed is below 50 Mbps, try changing the router channel (for example, from Auto to Channel 6). 9A) It can help to disable the Wi-Fi function+ customized.
To test Bluetooth, connect your headphones or fitness bracelet. If the connection is constantly breaking, update your firmware or reset your network settings (Settings → System → Reset → Reset your Wi-Fi, mobile network and Bluetooth settings).
⚠️ Warning: If the phone stopped catching the network or Wi-Fi after the fall, it is possible to damage the antenna contacts on the motherboard. In this case, diagnosis at the service center is mandatory - self-repair can aggravate the problem.
6. Analysis of software errors: logs, crashes and viruses
Even if the hardware is fine, software bugs can simulate hardware malfunctions, such as constant reboots caused by a faulty battery or a damaged firmware.
Tools for diagnostic software:
- 🐞 Error Logs: Enable Developer Mode (7 times click on Version) MIUI In Settings → About the phone, then go to Settings → Additionally. → For developers → Error logs. Critical failures are recorded here.
- 🛡️ Viruses and Mining: Scan your phone through Malwarebytes or Xiaomi’s built-in Security Scanner. → Annexes → Launched.
- 🔄 Cache reset: go to Settings → Memory. → Clean up and do a deep cleaning, which will help if the phone is slowing down for no apparent reason.
If the crashes started after the MIUI update, check the forums (like 4PDA or XDA Developers) for known bugs for your firmware version. Often the solution is a rollback to a previous build or waiting for a patch.
For models with an unlocked bootloader, you can use fastboot to check partition integrity.
fastboot getvar allIt will show the status of critical components such as boot, recovery and system.
7.Diagnostics of display and sensor: broken pixels, touchscreen
The screen is the most expensive component of a smartphone, and its diagnosis requires special attention, and even microcracks on the glass can eventually lead to detachment of the touchscreen or damage to the matrix.
How to check the display:
- 🖥️ Broken pixels: run a color uniformity test (e.g., through the Screen Test in the Play Market). alternately display red, green, blue and black colors - broken pixels will be noticeable.
- 👆 Touchscreen: Swipe your finger around the edges of the screen -- if the sensor doesn't respond to touch in certain areas, it's a sign of plume damage. AMOLED (For example, Xiaomi 12) check the uniformity of the backlight in a dark room - yellow spots indicate a burnout matrix.
- 🔍 Artifacts: When watching a video or scrolling pages, pay attention to stripes, flickering or "ragged" animations. This can be a symptom of a graphics chip malfunction.
If the screen reacts to late touch, try calibrating the sensor through the engineering menu (#6484## → Touch Screen on some models (Redmi 9, Poco) M3) Helps reset the touchscreen settings in Settings → System system → Resetting settings → Resetting sensor settings.
⚠️ Note: If an unofficial service has "waves" when pressed or uneven backlighting after changing the screen, it is likely that an unoriginal display was installed.
8.When to contact the service: signs of serious malfunctions
Not all problems can be solved on their own, but there are symptoms that clearly indicate the need for professional diagnosis:
- ⚡ The phone won’t turn on even after charging (maybe the motherboard or power controller is damaged).
- 💦 Corrosion marks on board or connectors (after moisture is ingested).
- 🔥 Overheating without load (above 50)°C on standby).
- 📵 Total network absence (even after resetting and replacement) SIM-map).
- 🔋 The battery is swelling or the phone is switched off when 30-40% charge.
The cost of diagnostics in official service centers Xiaomi is usually 500-1000 rubles (2026), but it pays off by accurately identifying the problem. For example, replacing the camera plume will cost 1500-2500 rubles, while self-repair can lead to damage to the motherboard (repair price – from 5000 rubles).
If your Xiaomi is guaranteed, don’t bother disassembling it yourself – it will void warranty obligations. Contact an authorized service with a check and a box (in some cases, a passport is required).
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Before visiting the service, back up your data via Settings → System → Backup. After repair, the phone can be reset to factory settings.