The sensor on Android does not work: how to diagnose and fix the problem

Problems with the touch screen on an Android smartphone can turn ordinary use of the gadget into real torture. Either does not respond to touchesit works spontaneously, or part of the screen “does not feel” your fingers—are these familiar symptoms? Before taking your phone to a service center (where they will charge from 500 rubles for diagnostics, and from 2000 for repairs), try to figure it out yourself. In 60% of cases, the malfunction is eliminated using software methods or simple cleaning.

In this article we will analyze all possible reasons from banal contamination to hardware failures, and also provide step-by-step guide with photos and videos (where this is critical). We will pay special attention to the Samsung Galaxy, Xiaomi Redmi, HONOR i Realmemodels, since their sensors most often suffer from “glitches” after updates. If your phone is older than 3 years, do not skip the section on contact wear!

⚠️ Warning: If the screen is cracked or physical damage is visible on it (swelling, smudges), immediately go to the “Hardware failures” section. Trying to “fix” this programmatically is like treating a fracture with a band-aid.

1. Diagnostics: how to understand what exactly is broken

The first thing to do is determine the nature of the malfunction. The sensor may not work well for two main reasons:

• 🔹 Software failure - glitches after an update, viruses, application conflicts.
• 🔧 Hardware problem - damage to the cable, wear of the touch film, moisture ingress.

To distinguish one from the other, run sensor test. To do this: Sensor test or

1. Go to Settings → System → About phone.
2. Find an item Diagnostics (on Samsung) or Hardware test (on Xiaomi/Redmi).
3. Select Touch screen test.

If there is no such item, use third-party applications, for example, Touchscreen Test (available in Google Play). In the test you will be asked to touch the crosses on the screen one by one. Please note:

• ✅ If all touches are registered, but with a delay, the problem is in software optimization.
• ❌ If part of the screen does not respond or reacts incorrectly (for example, a touch in one place is displayed in another) - this is hardware failure.

2. Software solutions: from rebooting to resetting settings

Start with the simplest methods. Often the sensor starts to fail due to overloaded RAM or a system conflict. processes.

2.1. Forced reboot

It sounds trivial, but it works in 30% of cases. If the screen responds to touches, but with a delay:

1. Press the button Power for 10-15 seconds.
2. Wait for vibration and the appearance of the manufacturer's logo.
3. After turning on, check the operation sensor.

If the screen does not respond at all, try hard reset (button combination depends on the model):

• 📱 Samsung Galaxy: Power + Volume up (hold for 10 sec).
• 📱 Xiaomi/Redmi/POCO: Power + Volume up + Volume down.
• 📱 HONOR/Realme: Power + Volume down.

2.2. Clearing the cache and data of the System Interface application

Sometimes the sensor slows down due to a failure in the system process com.android.systemui. To reset it:

1. Go to Settings → Applications → All applications.
2. Find System interface (or Launcher on some firmware).
3. Click Storage → Clear cache and Clear data.

⚠️ Attention: After clearing the system interface data, the settings will be reset home screen (wallpaper, widgets, folders). Take screenshots of the current arrangement of icons in advance.

2.3. Sensor calibration

Older versions of Android (up to 10) had a built-in calibration function. Now it has been removed, but you can use third-party utilities, for example Touchscreen Calibration (requires rights root) or Screen Adjust.

If rootthere are no rights, try alternative method:

1. Enable Developer mode (click on Build number 7 times Settings → About phone).
2. Go back in Settings → System → For developers.
3. Find the option USB debugging and enable it.
4. Connect the phone to the PC and enter in ADB command:

   adb shell wm touch calibration reset

2.4. Reset to factory settings

If all else fails, use the last software method. Reset will delete all data, so make a backup first copy.

How to reset settings if the sensor does not work:

1. Turn off the phone.
2. Hold down the button combination to enter Recovery Mode (see section 2.1).
3. Use the volume buttons to select Wipe data/factory reset.
4. Confirm the action with the button Power.

After the reset, the phone will turn on like new. If the problem was in the software, the sensor should work normally.

3. Hardware faults: when repairs are unavoidable

If software methods do not help, most likely the problem is physical damage. Let's consider the most common causes:

3.1. sensor cable

The cable (flexible cable) connects the touch panel to the motherboard. When dropped or pressed hard, it may move away or breakSymptoms:

• 🔸 Part of the screen does not respond to touches (usually the top or bottom).
• 🔸 The sensor works in “waves” - sometimes it’s normal, sometimes it doesn’t react at all.
• 🔸 When you press the phone body in certain places the reaction improves.

🔧 What to do: Disassemble the phone and check the cable. If it comes loose, carefully reconnect it (experience with small parts is required). If it breaks, just replace it.

3.2. Wear of the touch film

Touch screens have a limited resource - usually 3–5 years active use. Over time, the film responsible for registering touches becomes thinner, especially in places of frequent use (for example, in the center of the screen).

📌 Signs of wear:

• 🔘 The sensor responds only to strong pressure.
• 🔘 “Dead zones” appear (usually at the edges).
• 🔘 The screen spontaneously clicks in the same places.

⚠️ Attention: If your phone is older than 4 years and you notice these symptoms, do not waste time on software methods. The touch film can only be replaced at a service center (cost - from 1500 to 5000 rubles depending on the model).

3.3. Ingress of moisture or dust

Even if the phone did not sink, humidity or dust they could penetrate under the screen through micro-slits. This leads to oxidation of the contacts and disruption of the sensor.

🔍 How to check:

1. Shine a flashlight at an angle on the screen - if streaks or condensation are visible, moisture has definitely gotten inside.
2. Check the moisture indicator (on most phones, it is located in the SIM card tray - a small white dot that turns red when in contact with water).

💧 What to do:

• 🌬️ If moisture has recently entered - do not turn on the phone, put it in a bag with silica gel (from the shoe box) for 24-48 hours.
• 🔧 If more than a day has passed, disassembly and cleaning with alcohol is required (it is better to entrust it to a specialist).

What will happen if you ignore moisture ingress?

If you do not dry the phone in time, oxidation of the contacts will lead to corrosion of the tracks on the board. In this case, repairs will cost 50–70% of the cost of a new phone.

3.4. Cracks or swelling of the screen

If there are cracks on the screen (even microscopic) or it has begun to “move away” from the body (bloating), the touch film could tear. In this case:

• 🚫 Do not press hard on the screen - this will aggravate the damage.
• 🛠️ The only solution is replacement of the touch module (together with glass).

💰 Repair cost:

Phone model	Cost of sensor replacement (with work)
Samsung Galaxy A52/A72	3 500 – 5 000 ₽
Xiaomi Redmi Note 10/11	2 500 – 4 000 ₽
HONOR 50/70	4 000 – 6 000 ₽
Realme 9 Pro	3 000 – 4 500 ₽

⚠️ Attention: On some models (for example, Samsung Galaxy S21+ and newer) the touch module comes complete with an AMOLED matrix. In this case, a replacement will cost 10,000–15,000 rubles - sometimes it’s cheaper to buy a new phone.

4. Repair features for popular brands

Manufacturers use different touch screen technologies, so approaches to repair may differ. Let's consider the nuances for top brands.

4.1. Samsung Galaxy (A, S, Note series)

Phones Samsung often use technology Super AMOLED with an integrated touch layer. This means that:

• 🔹 Sensor and display - one part, they cannot be replaced individually.
• 🔹 If the sensor is damaged, you will have to replace the entire module (from 5,000 ₽).
• 🔹 On models with Ultra Sonic Fingerprint (fingerprint scanner under the screen), after replacement you may need flashing scanner (otherwise it will not work).

4.2. Xiaomi, Redmi, POCO

In budget models Xiaomi sensors from third-party manufacturers are often installed (for example, Goodix or FocalTech). This leads to two problems:

1. Incompatibility of firmware — after updating MIUI, the sensor may begin to fail. Solution: roll back the firmware or install a custom one (for example, Pixel Experience).
2. Low quality of cables - they often fail when overheated. Check the phone temperature in Settings → Battery.

🔧 Tip: If after replacing the screen with Redmi Note the sensor does not work correctly, try to Settings → Advanced → Special capabilities disable the option Touch when lifting.

4.3. HONOR and Huawei

In phones HONOR (especially rulers X and V) often There is a problem with false touches due to poor-quality anti-glare coating. If the screen clicks spontaneously:

• 🔹 Try disable option Smart touch in the settings screen.
• 🔹 Update the firmware via Huawei HiSuite (official utility for PC).
• 🔹 If the problem persists, the touch glass needs to be replaced (the service HONOR does this under warranty if the phone is under 2 years old).

4.4. Realme, Oppo, Vivo

These brands use highly sensitive sensorswhich may conflict with cases or films. If the sensor responds poorly:

1. Remove the case and protective film.
2. In Settings → Screen → Touch sensitivity select High.
3. If you use dark theme, try switching to light - sometimes it helps (a bug in the firmware ColorOS).

5. Temporary solutions if repair impossible

If it is not possible to repair the sensor right now, but you need the phone for work, use workaround methods:

5.1. Connecting a mouse via USB or Bluetooth

You can control the phone using the mouse:

• 🖱️ Connect USB mouse via an OTG adapter (costs ~200 ₽).
• 📶 Or connect Bluetooth mouse (in settings Bluetooth).

🔹 How to enable mouse support:

1. Go to Settings → Accessibility → Pointer Control.
2. Enable option Mouse or trackpad.

5.2. Remote control via PC

Using apps TeamViewer QuickSupport or ApowerMirror you can control the phone from a computer:

1. Install the application on your phone and PC.
2. Connect the devices to the same Wi-Fi network.
3. Follow the instructions on the screen to pair.

⚠️ Attention: For these apps to work, you need Stable Internet. If the sensor does not respond at all, enable USB debugging in advance (in Settings for developers).

5.3. Voice control

If the screen responds to some touches, set up voice assistant:

1. Open Google Assistant (long press on the button Home).
2. Say: “Open Settings», «Call Mom", etc.
3. To launch applications, use the commands: "Open WhatsApp», «Launch Camera».

6. How to avoid problems with the sensor in the future

To make the sensor last longer, follow simple rules:

• 🛡️ Use high-quality protective glass (for example, Spigen Glas.tR EZ Fit or Belkin Invisiglass). Cheap films can scratch the sensor.
• 🔥 Do not leave the phone in the sun or near heat sources - overheating damages the adhesive that holds the sensor.
• 💧 Avoid contact moisture. Even if the phone is protected IP68, over time the seals wear out.
• 📱 Do not press hard on the screen (for example, when typing). Modern sensors are designed for light touches.
• 🔄 Update the firmware regularly, but do not install beta versions —they often contain bugs that affect the operation of the sensor.

📌 Tip for gamers: If you play a lot on your phone, use gamepad or triggers (for example, Black Shark Gamepad). Constant intense pressing wears out the sensor 2-3 times faster.

7. When to contact a service center

If you have tried all the methods, but the sensor still does not work, it is time to contact a specialist. Here clear signsthat professional help is needed:

• 🔧 The screen does not respond completely to touches (even after resetting the settings).
• 💥Stains, smudges or swelling are visible on the screen streaks, smudges or swelling.
• 🔌 The sensor only works at a certain tilt phone (a sign of a problem with the cable).
• 🔄 After replacing the screen, artifacts or false touches appeared in an unofficial service artifacts or false touches.

💡 How to choose a service center:

Criterion	What to check
Official status	On the manufacturer's website (for example, Samsung Members or Mi Service) there should be a label “Authorized service center.”
Work warranty	Minimum 6 months (to replace the screen).
Spare parts used	Must be original or certified (for example, OEM).
Reviews	Check Google Maps, 2GIS or Yandex.Reviews -pay attention to the latest ones (for the last month).

⚠️ Attention: Unofficial services often install cheap Chinese copies of screens, which after 2-3 months begin to “peel off” or turn yellow. On models with AMOLED screens (Samsung Galaxy S/A, Xiaomi 12/13), the use of non-original spare parts leads to the appearance of dead pixels within a week.

Frequently asked questions

🔹 The sensor stopped working after updating Android. What to do?

First try roll back the update:

1. Go to Settings → System → Software update.
2. Click on the three dots in the upper corner and select Delete last update (if this option is available).

If a rollback is not possible, perform reset settings (see section 2.4). If this does not help, check the forums (for example, 4PDA) - perhaps a patch has already been released for your model.

🔹 Is it possible to fix the sensor yourself if it comes off the body?

If the sensor physically removed (you can see the gap between the screen and the case), but not cracked, you can try:

1. Gently heat the screen with a hairdryer (temperature no higher than 60°C!).
2. Press the sensor to the case (for example, put the phone under a heavy book for 12 hours).

⚠️ Risk: If you overheat, the glue will completely melt and the screen will have to be replaced. It is better to take it to a service center, where they will glue it using special equipment (LOCA machine).

🔹 Why does the sensor work poorly in cold weather?

At temperatures below –10°C the liquid crystal layer of the screen becomes less sensitive, and touch sensors may malfunction. This is normal for most smartphones (except for “frost-resistant” models like CAT S62 or Doogee S96).

🔹 What to do:

• Put the phone in the inner pocket (closer to the body).
• Do not try to quickly warm it with hot air - this will lead to condensation inside.
• Use gloves that support touch input.

🔹 The sensor works, but with a delay. What is the reason?

Probable reasons:

1. Overloaded system - close background applications through Settings → Applications → Running.
2. Energy saving mode - disable it in Settings → Battery.
3. Low sensor polling rate —in Settings for developers find Minimum width and install Smallest width = 360 (this will increase sensitivity).
4. Worn out battery —if the battery is swollen, it can put pressure on the sensor cable.

🔹 How much does it cost to replace the sensor in the official service?

The cost depends depending on the model and screen type:

• Budget phones (Redmi, Galaxy A) — 2 500–4 500 ₽.
• Flagships (Galaxy S/Note, Xiaomi 12/13) — 6 000–12 000 ₽.
• Folding phones (Galaxy Z Flip/Fold) — 15 000–30 000 ₽ (due to the complexity of the design).

💡 Advice: Before repairs, check whether they provide a warranty for work and spare parts. In official services Samsung And Xiaomi the warranty for screen replacement is 6 months.