No Backlight and Bootloop
I’ve got a question and I hope somebody can help me.
I changed the Lightning Connector and Battery on my IPhone 8 and now the Phone doesn't turn on again.
I can see the apple appear in a dark screen with no backlight but it seems to hang in a loop because it disappears and comes on again and so on.
What could be the mistake there? It's not the first repair on an IPhone and I made everything exactly like mentioned in the repair guide. I checked the connectors visually and could not find any damage.
Thank you for your help in advance!
Edit: The phone itself seems to be alive, because today the alarm went of, I can set it to snooze mode and I can charge my Phone via the wallplug.
I measured the voltages and resistance now. If I get the schematics of the J5700 Connector right, the 6 Pins from 37-47 are for the Backlight? These are the Values I got with my Fluke 179 in Beep Mode:
37 - 502 Ohm, 39 - Overload, 41 - 398 Omh, 43 - 612 Ohm, 45 - 523 Ohm, 47 - 612 Ohm.
I also checked the Voltages with the Battery attached and the values where:
37- 0V, 39 - 0V, 41 - 0V, 43 - 0V, 45 ~2.6V, 47 - 0V
So could anybody help me where I would have to look for the Problem further? I guess 39 should normally have a Voltage reading too? Or would it be a better Idea to go to a repair shop with the half disassembled Phone and let them do the further work?