Vietnamese training PDF in a 198 KB RAR whose title translates to power supply circuit for the chipset. Not linked to any brand or board, it describes how the chipset rails are generated and sequenced on a laptop motherboard. Such guides usually cover the regulators, MOSFETs, enable and power-good signals involved, and the voltages to expect. It is useful for learning where to probe when a chipset rail is missing or shorted, but the actual values must be checked against the schematic for your board.
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 @generalschematics. 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.