LCFC schematic for board NM-A681P at early revision r0.2, a 1.41 MB PDF with no laptop model named in the file name. LCFC is the Lenovo design arm that numbers its boards NM-Axxx, so the board belongs to a Lenovo machine. An early 0.2 revision may differ from mass-production boards in component values or placement, so compare the PCB revision before relying on it. Use it to trace power rails, check signal paths and locate parts when chasing a short or a no-power fault.
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 @ITHINKHS. 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.