Samsung SM-J120F schematic, the Galaxy J1 (2016) model code, provided as a 2.39 MB PDF with no board revision in the name. The drawings help trace rails out of the PMIC, examine the charging and battery connector circuits, follow display and SIM lines and pinpoint components on a short. View it in any PDF reader. Before using measured values or locations, compare the board revision printed on the PCB with the one documented in the schematic.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)