Lenovo laptop boardview for LCFC board NM-F091, delivered as a 260 KB ZIP containing a BDV file with CAD layout data. LCFC is Lenovo's own design and manufacturing arm, and it uses NM-xxxx numbers on its PCBs. The layout shows part placement, net names and test pads for both sides of the board. Load it in a boardview program such as OpenBoardView or FlexBV to locate components, trace power rails and probe signals during diagnostics. Check the board number and revision printed on the PCB before trusting the layout.
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 @cynetitsolution. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.