On top right side of your phone, there is a proximity sensor.it has a specific use ie:- when you place it near your ear while calling proximity sensor gets covered and the touchscreen is disabled to prevent accidental pressing of button.
you are facing this problem because you laminated the proximity sensor so it is always covered and immediately when you call the touchscreen is disabled and so the screen gets blank..
remove your lamination to get it working
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that didn't work not sure if it has some kind of setting
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