Without a schematic, you don't have the logic map. You don't know what resistor controls what gate, or where the next trace leads. This is where the comes in.
Boardview files (commonly .brd , .cad , .fz , or .asc ) are used by repair technicians, engineers, and reverse engineers to visualize component placement, net connections, test points, and hidden inner-layer traces without requiring the original PCB design software. cm-4 94v-0 boardview