redmi note 3 pro proximity issue - Xiaomi Redmi Note 3 Questions & Answers

Hello sir
After during call screen is black out and no wake up press any key pls help

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what rom ?

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Recalibrate the proximity sensor
Make sure your sensor is not blocked with screen guard etc.
Try to re-calibrate your proximity sensor.
http://webcazine.com/16981/qa-miui-7-how-to-calibrate-the-proximity-sensor-on-my-xiaomi-phone/
Or alternatively this link with more instructions: -
http://www.androidbeat.com/2016/10/fix-proximity-sensor-not-working-issue-redmi-note-3/
Recalibrate the proximity sensor
If a restart does not solve the proximity sensor issues on your Redmi Note 3, you can try recalibrating the sensor from the hidden service menu of the phone. This service menu can be accessed by opening the Dialer app and keying in “*#*#64663#*#*”. From the menu that opens up, tap Proximity Sensor followed by Calibration. Once the calibration successfully toast message comes up, tap Black Card and immediately keep your finger on the proximity sensor. You should get a BlackCard success message. If not, repeat the step again.
On your phone’s dialer, enter * # * # 64663 # * # *
On the Hardware tests menu, select Proximity sensor.
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Tap the Calibrate button.
When you see Calibration passed, you can tap the Home button to exit the hardware test.