Archive of drawings for the Lenovo E40 based on the HM55 chipset and the GC5 board, which follows Quanta's project-code naming. The name says drawings, which usually means schematics, but the exact contents of the 1.04 MB RAR should be checked after extracting. The HM55 detail places the design among Intel's first-generation Core i platforms. These documents help trace power rails and chipset supply voltages, so make sure the board markings match first.
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.
7-ZipWinRARThe Unarchiver (macOS)