Schematic diagram for the Xiaomi Mi 2s phone, packed as a 949 KB ZIP archive. The circuit drawings let a technician follow supply rails from the battery connector and PMIC to the processor, memory and peripherals, and identify signal names, part designators and test points while hunting a short or a dead line. The extracted pages are usually PDF and open in any PDF reader. Before measuring, confirm that the mainboard revision on the PCB matches the sheets, because component values can differ 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.
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Compressed archive that every operating system opens without extra software.