A 2.39 MB PDF schematic for the Samsung SM-J120F handset, describing the phone's main board circuits. It is useful when diagnosing no-power, no-charge or no-signal faults, as it shows how the battery connector, PMIC, charger IC and RF sections connect. Open it in any PDF reader and search for net names to jump between pages. The name gives no board revision, so compare the layout and component markings on the actual PCB with the drawings before replacing parts based on them.
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.