Why the sensor on the Xiaomi phone does not react: a full analysis of the causes and solutions

The touchscreen on Xiaomi’s smartphone is not just an interface, but a key element that accounts for 90% of the device’s functionality. When the touchscreen stops responding to touch, the phone becomes a brick: you can’t open apps, type a message, or even unlock the screen. Service center statistics show that 37% of calls about Xiaomi are related to a broken sensor — and in half of cases the problem is solved without changing the display.

In this article, we will analyze all possible causes, from banal screen contamination to serious hardware breakdowns, as well as give step-by-step instructions for diagnosis and repair. 10/11/12, POCO X3/X4/X5 and flagships Xiaomi 13/14, If your phone doesn't respond to touch partially (for example, only at the top of the screen) or completely, here's the solution.

1. Software failures: when the software is to blame

In 60% of cases, a broken sensor on Xiaomi is associated with firmware errors, application conflicts or system lags. Before you carry your phone to the service, try these methods:

• 🔄 Reboot the device. Press the power button for 10-15 seconds until the phone turns off and re-engineered.
• 📱 Safe Mode. If the sensor is running in safe mode, it's the third-party app's fault. → long tap on "Switch off» → «Safe regime».
• 🔧 Reset sensor settings. Go to Settings. → Special facilities → Touching → Reset calibration (not available on all models).
• 📲 Update MIUI. Go to Settings. → The phone. → System update. Sometimes bugs get fixed in new firmware versions.

If the sensor is running after the reboot, but the problem is back, it's the application that's to blame to find it.

1. Enter Settings → Annexes → Application management.
2. Sort by installation date (new) → old-fashioned).
3. Remove suspicious programs (especially launchers, antiviruses, or games with advanced resolutions).

⚠️ Attention: On Xiaomi models 12T and POCO F4 post-update MIUI 14 reported massive complaints about the sensor's dead zones. MIUI 13.5 via Fastboot.

2. Hardware damage: what breaks physically

If the software methods didn't work, the problem is the hardware. Xiaomi's touchscreen is made up of several layers:

• 🔲 Protective glass (if cracked, it can block the signal).
• 📱 Touchscreen (film with touch sensors).
• 🖥️ AMOLED/LCD matrix (responsible for the image).
• 🔌 Display plume (connects the screen to the motherboard).

The most vulnerable areas:

On models Xiaomi 13 Ultra and POCO X5 The Pro plume is integrated with the frame of the case, and if it is damaged, it requires replacing the entire module, which costs up to 70% of the price of a new phone.

3.Moisture and oxidation: a hidden threat

Even if your Xiaomi hasn’t drowned in water, moisture can get in through:

• 💦 Microcracks in the body (especially after falls).
• 🔌 Charging connector (if the phone was lying in a wet room).
• 📶 Antenna lines (on models with metal body).

Signs of moisture intrusion:

• 🔴 Moisture indicator in the tray SIM-the cards are red.
• 📱 The sensor reacts spontaneously (as if someone touches the screen).
• 🔥 The phone overheats without loading.
• 🔌 Charging is jerky or does not go at all.

What to do:

1. Turn off the phone immediately and remove it. SIM-memory-card.
2. Put the device in a silica gel bag (out of a shoe box) for 24 to 48 hours. Rice or salt won't help!
3. Do not turn on the phone until it is completely dry (at least a day).
4. If after drying the sensor did not work - requires cleaning the board with ultrasound (in the service).

⚠️ Note: On Xiaomi models with IP53 (For example, the Redmi Note 12 Pro+) We have minimal protection against moisture -- even high humidity in the room is enough to make the contacts oxidized!

4. Failures after falling or impacting

Drop Xiaomi on the pavement, hit a corner, or get on your phone? Even if the screen is intact, internal damage can be serious.

• 💥 Cracking matrix → black-bar + sensorless.
• 🔌 The plume break → The screen flashes, the sensor responds only in one corner.
• 📐 Deformation of the framework → touchscreen → false-touch.

How to check:

1. Connect your phone to an external monitor USB-C → HDMI (If there is an image but the sensor is not working, the problem is the display module.
2. Light a flashlight at an angle on the screen: if you see rainbow divorces - touchscreen peeled off.
3. Click on different parts of the screen: if the sensor starts to work when pressing on the upper left corner, the plume is to blame.

Cost of repair:

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If the sensor is working after the fall, but the screen is floating when pressed, don't pull with the repair! The detachment of the touchscreen over time leads to complete sensor failure and damage to the matrix.

5. Problems with firmware and drivers

Sometimes the sensor stops working after:

• 📲 Updates MIUI (particularly beta).
• 🔧 Installation of custom firmware (LineageOS, Pixel Experience).
• 🛠️ Incorrect reset to factory settings.

How to fix it:

1. Firmware rollback: fastboot flash system system.img fastboot flash boot boot.img (requires an unlocked loader).
2. Flashing through Mi Flash Tool: Download the official firmware for your model from Xiaomi. Unpack the archive and launch MiFlash.exe. Connect your phone in Fastboot mode (keep Volume down). + Select the firmware folder and press Flash.
3. Reset via Recovery: Turn off the phone. Press Volume up + Power until the Mi logo appears. Select Wipe Data → Wipe All Data.

If the sensor has not worked after firmware, check:

• 🔌 Is the display plume connected correctly (if the phone was disassembled).
• 📋 Does the firmware version match the phone model (for example, the firmware for the Redmi Note 11 is not suitable for the Note 11 Pro).

6.When battery or board is to blame

It is rare, but sometimes the sensor does not work because of:

• 🔋 Bloated battery (presses on the display plume).
• 🔌 Faulty power controller (does not apply voltage to the screen).
• 🔥 Overheating of the processor (on Snapdragon) 8 Gen 1/2 Xiaomi 12/13).

Signs:

• The phone turns off when charging.
• The screen flickers and the sensor shuts down for a few seconds.
• The body is deformed (especially from the battery side).

What to do:

1. Try to connect the charging: if the sensor is working, the battery is to blame.
2. Light a flashlight on the back cover: if you see a bloated battery - urgently replace it.
3. If the phone is warming without loading - reset the settings through Recovery or check the thermal paste on the processor (in the service).

⚠️ Attention: On models POCO F2 Pro and Xiaomi Mi 10 Ultra bloated battery can damage not only the plume of the display, but also the motherboard. If the case is already "flavoring" - do not turn on the phone until the battery is replaced!

7.Diagnostics through test modes

All Xiaomi smartphones have hidden tests to check the sensor.

1. Open the Phone app.
2. Dial the code: ##6484## (for display test) or #4636## (general diagnostics).
3. Select Touch Test or Sensor Test from the menu.
4. Swipe your finger across the screen: if the track is interrupted or disappears, the sensor is damaged.

Alternative method (if the codes do not work):

1. Install the Touchscreen Test app from Google Play.
2. Run the Multi-Touch test.
3. If the screen does not respond to 2+ Touching – a problem in the sensor controller.

Test results:

• 🟢 All touches are displayed - the sensor is serviceable (problem in the software).
• 🟡 Traces are interrupted in one place - a touchscreen or plume is damaged.
• 🔴 The screen does not respond at all – the controller or board is faulty.

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If the test shows that the sensor is working, but the actual touches are not recorded, it's the firmware or driver conflict. Try resetting the settings through Recovery.

8 What to do if nothing helps

If you’ve tried all the methods and the sensor on Xiaomi still doesn’t work:

1. Contact the service center: 🔧 Official Xiaomi Partners (listed on Mi Service website). 💰 Cost of diagnosis: 500–1 500 ₽ (often included in the cost of repair).
2. Check warranty: If the phone is warranty, don't disassemble it yourself - this will void the warranty. In the case of a factory defect (for example, detachment of the touchscreen on the new Redmi Note 12), repairs will be free.

Consider replacing your phone

• If the cost of repair exceeds 50% of the price of a new smartphone, it is more advisable to buy a new one.
• On models older than 3 years (such as the Redmi Note 8), replacing the display module is often unprofitable.

Before the service visit:

• 📋 Write it down. IMEI phone (on a box or under a battery).
• 🔄 Backup your data (if the phone is switched on somehow).
• 📸 Take a photo of external damage (cracks, dents) for insurance.

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If you live in a small town that doesn’t have Xiaomi service centers, send your phone for repair by mail. Many workshops (like Fix Price or TechnoDoctor) offer free round-trip delivery.

FAQ: Frequent questions about Xiaomi's broken sensor