Foxconn-designed Lenovo laptop schematic identified by the project name S04, with no model number or revision stated. Around 1.08 MB in PDF form, it should contain the usual block diagram, power rail pages and interface sections. Repair technicians use such documents to follow a rail back to its regulator, find which component pulls a line to ground, and read connector pinouts for keyboard, display or battery. Because Foxconn codes can be similar, verify that the PCB is marked S04 before working from this file.
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 @schematicslaptop. Enginerys does not host this file.
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How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.