Vertical lines on iPhone 5s during refurbishment
We recently started to refurbish iPhone screens. We are doing well with iPhone 6, but we have lines problem with 5s. Something around 30% of screens have vertical lines. We tried to reconnect them and it didn't work out. I heard it might be because of static electricity but we use antistatic silver paste. We tried to apply it in different ways it doesn't help, pretty sure there is no mechanical damage of flexes or screens. Anyone experienced the same? How to solve this problem?
Is this a good question?