Archive for the Lenovo B570 laptop, naming Wistron as the board maker and LZ57 as the project code Wistron uses for this design. The 2.22 MB RAR most likely contains the schematic, though the contents should be confirmed after unpacking. Wistron boards usually carry the project name and revision on the PCB, so check them before trusting the diagrams. With a matching schematic a technician can follow the power-on sequence, test each regulator and find shorted components.
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 @alischematics. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.