Schematic for the Samsung Galaxy Young 2, model SM-G130E, in a 3.12 MB PDF file. The name gives no board revision, so read it from the drawing title blocks. Samsung circuit diagrams of this sort map the PMIC outputs, battery and charging circuit, SIM, display and keypad connections, helping locate test points and trace a short or a missing supply. It opens in any standard PDF viewer, and text search for net names speeds things up. Confirm the E variant and the PCB revision match before measuring.
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_mobile_iran. 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.