Original post by: Josh White ,
Sounds to me like long screw damage if this is after an LCD replacement. Do you think it's possible you mixed up some of the screws while re-assembling the phone? iPhone 6 is very easy to damage if you mix them up. The wrong screw in the wrong hole can ruin motherboard traces. The first thing I would try would be removing all the screws for the LCD connector shield and any other screw you moved on the motherboard when you repaired it. Then see how it operates without those in. Let me know what happens.