Xiaomi POCO M3 schematic packed as a 4.20 MB RAR archive, with the name indicating the diagram is inside in PDF form. No board number or revision is given. Extract it with any RAR-capable tool and open the PDF in a standard reader to follow power rails, check PMIC outputs, trace charging, display and audio circuits and look up component values. A schematic complements a boardview for locating parts physically. Confirm the phone's board version matches the drawings, as Xiaomi models can have several hardware revisions.
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 @GENERAL_SMART_PHONE_SCHEMATICS. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.