Chosen Solution
I have an iPhone 6s and I received a replacement screen to swap out the cracked screen. The screen replacement went without issue, but after installing the new screen. I can turn on the phone and the backlight will flash for a moment before turning off. The backlight comes on fine when the phone is completely dead and plugged in showing the white/red charge icon. I have attempted to reset the device, but still have no working backlight. Any suggestions?
Ryan Collins , Unplug the LCD connector and charge the phone around 15 mins then unplug the charger and connect the LCD connector and check whether phone charge at last 5% if it is something wrong with your new LCD backlight. otherwise you may need to check the logic board.
