For all those who have updated their Yu Yureka to Lollipop update and are facing the black screen problem while making or receiving calls, is due the problem with the proximity sensor.
Though you can wait for the next update, you can also try to fix it by yourself by doing the following:
Open the dial pad in the mobile phone.
Dial the no *#*#7769#*#*
In the calibration screen click the Start button.
Wait till it shows Calibration Good in green color.
Then click the Exit button.
Thats it !
This should fix your problem. Well it did work in my case.
Though you can wait for the next update, you can also try to fix it by yourself by doing the following:
Open the dial pad in the mobile phone.
Dial the no *#*#7769#*#*
In the calibration screen click the Start button.
Wait till it shows Calibration Good in green color.
Then click the Exit button.
Thats it !
This should fix your problem. Well it did work in my case.
