Samsung Galaxy A30 schematic for model SM-A305N, delivered as a 1.75 MB PDF. A service diagram of this kind lets a repair technician follow battery and PMIC power rails, charging circuitry, display and camera connector pinouts, and signal paths between the main processor and peripherals. PDF schematics open in any reader, and text search helps locate net names and component designators quickly. Check that the model suffix on your unit matches, since regional variants of the same phone can use different board layouts.
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 @esquemaseletricos. 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.