: Locate the USB-C connector (sub-board) and the charging IC (PMIC) on the mainboard. Problems here often cause "not charging" or "slow charging" issues.
: Schematic tracks show the power distribution from the 3500 mAh battery through various PMICs (Power Management Integrated Circuits) to regulate voltage for sensitive components like the 500-nit HDR10 display. nokia 8.1 schematic diagram
Locating the backlight driver if your screen is "on" but too dark to see. : Locate the USB-C connector (sub-board) and the
Finding a comprehensive schematic for the Nokia 8.1 (also known as the nokia 8.1 schematic diagram