Circuit schematic in PDF for the original Xiaomi M1 phone, with the Chinese title meaning Xiaomi schematic diagram. It documents the mainboard power tree, charging, processor, memory, display and radio connections and is used to trace a dead rail, find what a shorted part feeds, or check expected signals. The companion M1 top and mirrored bottom layer sheets help locate parts physically. Do not mix it with the M1s documents, since that model uses a revised board, and open it in any PDF viewer.
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.