Why do these bars appear on my iPhone 6 screen
I replaced a iPhone 6 battery yesterday (06/02/18) and since could not get the side power button to work, but the main problem is that since then, the screen had grey bars on it.
I disconnected the screen cables and reattached them in the right order/slot etc. Now I have these bars showing:
Please help as I don't want to have to buy a new phone