Logic block diagram for the Xiaomi Redmi 3A, with a Chinese title, supplied as a 738 KB PDF. It maps how the main chips and interfaces connect and which buses and supply rails tie the subsystems together, a quick reference before deeper troubleshooting. Use it to decide whether a fault in charging, display, audio or radio points to the PMIC, the processor or a peripheral chip. Combine it with the full schematic and the component map for measurements, and confirm the board version matches.
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 @mobileschematicshub. 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.