Intel publicly provides the Intel H55 Chipset Datasheet (document number 323274) which includes power sequencing, pinouts, and signal definitions. This can help you reverse-engineer or troubleshoot without the exact Zebronics schematic.
If you're repairing the board, you can trace circuits manually using a multimeter in continuity mode and compare with generic H55 reference schematics available on sites like ElectroSchematics.com or AllAboutCircuits.com .