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Redmi 10 Screen Turns Black During Calls | Call Disconnecting Problem | Solved

If your Redmi 10 screen turns black during phone calls and you cannot disconnect the call because the display remains off, the most likely cause is a dirty or malfunctioning proximity sensor.

Fortunately, before replacing any hardware or performing a factory reset, you can use the built-in Redmi hardware diagnostic tool to verify whether the proximity sensor is working correctly.

In my case, the proximity sensor initially failed the hardware test. After cleaning the sensor area with a tissue lightly moistened with 70% isopropyl alcohol, the test passed and the phone worked normally again.

Symptoms

Redmi 10 screen goes black during calls.
Unable to disconnect or end the call.
Screen does not turn back on after moving the phone away from your ear.
Touchscreen appears frozen only while making or receiving calls.

Step 1 – Open the Redmi Hardware Test Menu

Open the Phone (Dialer) application.
Enter the following code exactly as shown:

*#*#6484#*#*

The CIT (Hardware Test) menu should open automatically.

Insert Screenshot 1: Dialer showing the code.

Insert Screenshot 2: CIT Hardware Test menu.

Step 2 – Test the Proximity Sensor

Scroll through the hardware tests.
Select Proximity Sensor.
Tap Test.
Cover the upper part of the phone near the earpiece with your finger.

The proximity sensor is located near the top of the display, close to the earpiece speaker.

If the test displays FAIL, continue to the next step.

Insert Screenshot 3: Proximity Sensor test showing FAIL.

Step 3 – Clean the Proximity Sensor

Dust, skin oils, pocket lint, or other dirt can prevent the proximity sensor from operating correctly.

To clean the sensor:

Take a soft tissue or microfiber cloth.
Lightly moisten it with 70% isopropyl alcohol.
Gently wipe the top edge of the display around the earpiece and proximity sensor.
Allow the alcohol to evaporate completely before testing again.

Important: Never pour alcohol directly onto the phone. Apply it only to the tissue or cloth.

Insert Photo 1: Cleaning the top of the Redmi 10 display.

Step 4 – Test the Sensor Again

Return to the Proximity Sensor test.
Tap Test.
Cover the sensor again with your finger.

If cleaning solved the problem, the diagnostic should now report:

PASS

Insert Screenshot 4: Proximity Sensor test showing PASS.

Step 5 – Verify the Fix

Make a test phone call.

The screen should now:

Turn off only when the phone is near your ear.
Turn back on when you move it away.
Allow you to disconnect the call normally.

In my case, the issue was completely resolved after cleaning the proximity sensor.

What If the Test Still Fails?

If the proximity sensor still reports FAIL after cleaning:

Remove any screen protector covering the sensor area.
Remove the protective phone case.
Restart the phone.
Install any available MIUI or HyperOS updates.
Repeat the hardware test.
If it still fails, the proximity sensor or its flex cable may require replacement.

Frequently Asked Questions (FAQ)

Why does my Redmi 10 screen turn black during calls?

The phone uses a proximity sensor to detect when it is close to your face. If the sensor is dirty or faulty, the display may remain black during the entire call.

Can a dirty proximity sensor cause this problem?

Yes. Dust, fingerprints, skin oils, or pocket lint around the sensor can interfere with its operation.

How do I test the Redmi 10 proximity sensor?

Open the Phone app, dial *#*#6484#*#*, select Proximity Sensor, and tap Test.

Do I need to replace the sensor?

Not necessarily. If the sensor passes after cleaning, no replacement is required. If it continues to fail after cleaning and restarting the phone, hardware repair may be necessary.

Conclusion

If your Redmi 10 screen turns black during calls and you cannot end the call, don't assume the phone is defective.

Using the built-in CIT diagnostic menu, I confirmed that the proximity sensor initially failed. After cleaning the sensor area with a tissue lightly moistened with 70% isopropyl alcohol, the sensor passed the hardware test and the problem disappeared completely.

This simple five-minute procedure may save you from an unnecessary repair or factory reset.

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