A compact 1.63 MB PDF schematic covering the Samsung SM-J320F phone. The name states the model only, with no board revision. Even a smaller document like this is useful for tracing power and charging paths, checking the USB and battery connector circuits, identifying SIM and memory card lines and locating protection components on rails that show a short. Any PDF reader handles it, and text search by designator speeds up work. Before trusting part numbers or values, verify that the board in hand is the SM-J320F version shown.
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 @tamirat_moobile. 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.