Archive for the Lenovo IdeaPad Y770 tied to the Compal LA-6758P motherboard. Compal uses the LA-xxxxP pattern for its laptop boards, and the same number is printed on the PCB near the memory slots or along an edge. The 1.88 MB RAR probably holds the schematic, which helps when tracing the power path from the adapter input, checking switching regulators and locating a shorted capacitor. Confirm the board number and revision on your board, since Compal often reuses layouts across several models.
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.