Sony MBX-195 motherboard schematic package for the M790 project, revision 1.0, built around the Intel PM45 chipset, packed as an 815 KB RAR. PM45 is a mobile Intel 4-series chipset used with discrete graphics, so this board version expects a separate GPU. The diagram assists with tracing rails, signals and components during power or display fault repairs. Confirm the MBX-195 label and revision on the PCB, and note that variants with other chipsets will differ.
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 @IT_SERVICE_WORLD. 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.
7-ZipWinRARThe Unarchiver (macOS)