Chosen Solution

Good morning. I replaced the display in my iphone 6 plus, immediately seemed to work perfectly, but sometimes when I unlock the phone the screen stays black (i hear the sounds of unblocking but remains black …. Heeeeeeelp

it could be that the Display Connector is not connected completely to the Port or you have a little bit of Dust in the Connector. Pull the Display out again and clean the Connector and the Port.