White circle lightning , doesn't charge, diagnostic steps
I am trying to save a S9, my company doesen’t need it (no warranty).
If I plug the phone I get a white circle with lightning icon, nothing change after an hour.
Bought another battery, nothing changed.
The phone turns on by itself, if not plugged. Phone vibrates, Samsung Galaxy logo appears and nothing happens.
No signs of burned, missing or water damaged components.
I have laboratory power Supply, microscope, multi meter and experience with notebook repair.
Can you suggest me any diagnostic steps?