Bottom-side component placement sheet for the LCFC NM-C421 board used in Lenovo laptops, a 112 KB PDF that complements the matching top-side drawing. It helps you map designators from the circuit diagram to physical locations on the underside, such as capacitors, MOSFETs and connectors, when hunting a short or a missing part. Any PDF viewer opens it, and zooming reveals the reference labels. Make sure the PCB is printed NM-C421 and note that a later revision may shift some footprints.
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.