Nokia 8.1 Schematic Diagram -

A visual map of the physical motherboard. If you click a pin on the Bitmap , it often highlights all the other points it connects to, which is a lifesaver for finding broken traces . Safety First Before you start poking around the motherboard:

4GB/6GB LPDDR4X RAM paired with 64GB/128GB eMMC 5.1 / UFS 2.1 storage. Power Management: Qualcomm PM660 and PM660L chips. nokia 8.1 schematic diagram

Liquid causes corrosion between tiny components. A resistor labeled "R2204" might turn black. Without the schematic, you don't know if that resistor was 0 Ohms (jumper) or 100k Ohms. The diagram gives you the specific value to replace it with. A visual map of the physical motherboard

The 6.18-inch IPS LCD panel connects via a ribbon cable. The schematic identifies the display interface connector (usually MIPI lines), backlight circuit (anode/cathode), and touch signals. Power Management: Qualcomm PM660 and PM660L chips

You need both . Use the schematic to know what to test. Use the layout to know where on the board to touch your multimeter probe.