This is an IPoX IP-4GV163 motherboard with 845GV chipset and P4 Socket 478. Its on-board LAN MAC address is 00-1A-D4-00-11-FA.
I got search hits for User's Manual and Datasheet. Your chances of find schematics for this board - or any board, for that matter - are slim; manufacturers simply do not release schematics; that's part of their IP. While IDE interfaces are indeed in the ICH (southbridge), AGP is handled in the GMCH (northbridge). If your failure has gone this far, the board is likely scrap. I did see some for sale on eBay, BTW...
Hope this helps,