If you connect your iPhone 7 Plus with the USB cable to your wall charger or PC/Mac, you may hear the vibrator turn on and sound and then you have changed the LCD/Glass assembly to make sure it is not your LCD or backlight film and, yet, you still have no screen or dim screen then you most likely have a backlight problem.
This is the Backlight Filter/Fuse on Board replacement for iPhone 7 Plus.
It can be used to replace your got damaged and stopped working Backlight Filter / Fuse.
Port Marking: FL4601 / FL4602 / FL4603 / 0201 / 33OHM.
Compatible with A1661 / A1784 / A1785 / A1786