Schematic for the Xiaomi Mi 9 Lite smartphone, labelled in Spanish as esquematico, in an 803 KB PDF; the brand appears misspelled in the name. A PDF reader is enough to view it. Phone schematics like this are used to follow charging and power circuits, trace battery, PMIC and display connector lines, and locate the source of current draw or no-power faults. The name gives no board revision, so compare the circuit and component markings with the actual phone mainboard before replacing parts.
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 @uzb4422. 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.