If you can hear notifications but the screen remains completely dark, you likely have a broken backlight circuit.
The Nokia 8.1 frequently suffers from charging port wear and tear, but if replacing the flex cable doesn't work, the fault lies on the motherboard. nokia 8.1 schematic diagram
Safety Warning: Component-level motherboard repair requires specialized equipment, including a hot air rework station, a microscope, and professional micro-soldering skills. Attempting to desolder chips without proper training can permanently destroy the smartphone's logic board. If you can hear notifications but the screen
: You will need a precision screwdriver set, plastic spudgers/opening picks, a suction cup, isopropyl alcohol to soften adhesive, a digital multimeter, and a steady DC power supply. Attempting to desolder chips without proper training can
If you have a specific issue like a shorted capacitor or a dead charging port , please let me know: What is the exact failure symptom ? Have you already tried replacing any parts ? Do you have a multimeter or microscope ?