PDF schematic for the Lenovo K4 Note smartphone, model A7010a48, about 1.5 MB in size. Phone schematics show the PMIC, charging circuit, display and camera connectors, and the RF and audio sections, which helps when tracing a missing voltage, a no-charge fault or a dead peripheral. Any PDF reader opens it, and its text search makes it easier to find component designators. Match the board version printed on the PCB, as hardware revisions of the same model can differ.
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 @smart_repair_phone. 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.