RAR archive of about 2.17 MB holding a PDF schematic for board GK5CN5Z, a code in the GK5C family that resembles Tongfang barebone naming, though no retail brand is stated. Use it to trace supply rails, follow power sequencing signals and check what feeds each regulator when a laptop does not power on. Confirm the board code and revision on the PCB before trusting values, because sibling GK5C boards often share layouts but differ in populated parts.
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.
7-ZipWinRARThe Unarchiver (macOS)