Vertical lines in sleep mode only
Recently I changed the screen of an iPhone 6. Everything seems fine except that when it goes into sleep by itself there are faint vertical lines, which disappear as soon as I press the power button. When I press the button again the screen appears and works fine and no lines when I put it to sleep by pressing the power button again. Would you say it is
a) software problem or
b) defective screen
c) defective connection/connector (but then it should do this all the time)
Is this a good question?