PDF schematic for board NM-B421, with the R10 token most likely marking revision 1.0 and ATE appearing as an extra label whose meaning the name does not explain. The NM-xxxx numbering matches the LCFC pattern used on Lenovo laptops. A 3 MB circuit diagram like this lets a technician follow power sequencing, find which rail is shorted, and identify part values around the charger and VRM stages. Any PDF reader opens it; check that the board number and revision printed on the PCB match before trusting it.
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 @ShareMan_Electronic_Files. 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.