If your screen goes black on a phone call, it could be a result of the proximity sensor or distance sensor being miscalibrated or broken.

How to calibrate the sensor to solve black screen issue during calls

1: You will need a credit card for covering the proximity sensor (as shown in Video)

2: Turn on the device

3: Go to Call App

4: Enter engineering code *#87#

5: Select MMI1

6: Select Single Test

7: Scroll down the menu and select Distance Calibration to start calibration.

8: Before you start, make sure that the sensor is not obstructed from the light source. Please press [START]

9: See that it shows "STEP 2". Place the card over the sensor as close as possible. Then press [NEXT]

10: See that it shows "STEP 3". Place the card approximately 1cm away from sensor. Then press [NEXT]

11: Do NOT click on [RECALIBRATION]. Move the card close to the sensor and away from the sensor. The [PASS] button will become tappable. Press [PASS]

12: Press [Distance Sensor]

13: Use a card to slowly move towards the sensor and move away.

14: The screen should turn RED when your hand is on the top of the phone

15: The screen should turn BLACK when your hand is a certain distance away from the phone

If you are having trouble with calibration, please send us a video of this process so we can help you. Or email us (us@blackview.com.sg) to setup a time when we can video call you to help you on this process.

Other videos that you can also refer to