Service schematic for the Xiaomi Mi 9, the device with code name cepheus, in a 1.15 MB ZIP archive. The diagrams show how power rails leave the PMIC and charger and reach the SoC, memory and subsystems, with signal names and designators useful when diagnosing no-power, no-charge or missing display faults. Unpack the archive and open the sheets in a PDF reader. Compare the board revision on the phone with the drawings first, because component placement and values can change between 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 @esquematicosparatodos. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.