Chosen Solution
My Iphone has a dark screen. I have tried to adjust the brightness, but it is stil the same. Is is the Ambient light sensor defect or is it a defect LCD cable? I have also followed a guide of how to fic dim screen without open the Iphone, but it did not work. So it has to be a defect part, but I dont know which part.
could either be the screen or a bad component on the backlight circuit, possibly a coil
@djdannyrock is most likely correct then. If you have “Some” backlight, it is probably the coil as shown in pic. But if you are needing to flash a light on the screen to see anything, then I would start by checking continuity on the Filter first. If there isn’t continuity, it needs changed. If there is continuity, check the caps shown in red (3 in a row) if good, then purchase the Backlight repair kit and change the IC, Diode, Coil and Filter all at once. IC and diode are also pictured with red.
Settings > General > Accessibility > Display Accommodations > Reduce White Point > OFF
