Schematic diagrams for the Samsung SM-A510FD, the dual-SIM variant code, in a 1.54 MB PDF. No board revision is given in the name, so compare the designators on your mainboard with the drawing. Technicians use this to follow battery and charging circuitry, read PMIC rail names, check connector pinouts and find the component responsible for a short or missing supply. Any PDF viewer opens it; combine it with the disassembly guide for the same model to reach the board safely.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @schematic_mobiles. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.