Toshiba laptop repair archive identified only as FUX3SY2 with the code A4149A, delivered as an 80.6 MB ZIP. The name does not say what it holds, but the size suggests a package that may combine schematic, boardview or firmware material for that board. Extract it and check every file inside before use. Compare the board code silkscreened on the PCB with FUX3SY2 before tracing rails or flashing anything, since Toshiba boards with similar codes can differ in components and power circuitry.
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 @azvoltagemap. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.