Compressed schematic set named A405F, a code consistent with Samsung's SM-A405F phone model, packed as a 958 KB zip. The name gives no board revision or sheet breakdown, so check the contents after extraction. Circuit diagrams like these help when diagnosing no-power, no-charge or no-display faults, letting you follow the PMIC outputs, the USB charging path and the connectors pin by pin. Confirm the board marking on your handset matches the documentation, since regional variants sometimes differ in layout and components.
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 @phoneSchematics. Enginerys does not host this file.
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Compressed archive that every operating system opens without extra software.