Chosen Solution
I connected everything for my iphone 6 plus except the connectors on the motherboard. Well the last connector is giving me a problem. I am lining it up and it is not bent. It just keeps popping back off.
This is a belated answer so hopefully it can be of use to folks who search for and find this question. You need to take a closer look at the connector on the screen flex. If it is damaged then it will not hold into place in the receiving connector. These connectors are quite fragile and can be easily damaged. When properly connected, they should make a subtle yet noticeable “snap” sound. If this is during a screen replacement, you could try to re-connect the original screen to see if that one connects better. If it does, then the problem is with the connector on the replacement screen and if it doesn’t then the problem is with the logic board connector.
