Lenovo motherboard schematic for LCFC board NM-A052, in a 2.23 MB PDF. The name states no laptop model, revision or chipset, so match the NM-A052 label printed on the PCB before using it. Schematics like this show the complete circuit: power sequencing, voltage regulators, charger, embedded controller and data buses. That makes them the main reference for measuring expected voltages and tracing where a short originates. LCFC uses the NM-xxxx pattern on many Lenovo notebooks, and revisions can differ in component values.
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 @pepeelectronica. 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.