H46Y board schematic supplied as a PDF within a RAR archive of about 1.43 MB. No brand, model or revision appears in the name, so check the code printed on the motherboard before working from it. A matching boardview for the same board is listed separately and pairs well with this diagram. The schematic helps with following power-on sequencing, diagnosing missing rails, finding pull-up and enable signals, identifying the BIOS flash chip and checking expected voltages on regulators and their feedback networks.
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 @cyberlanelectonik. 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.