I'm trying to get the same thing working in a jamma cabinet with no luck.  Did you have to do anything else to get this to work?  I'm using a JROK multiwilliams board as a test case.  If I get vertical and horizontal sync directly from the board and use the vga connector on the d9500, everything works fine.  If I use the 10-pin PCBA connector and use the composite sync off the jamma connector, the d9500 syncs, but I get black video. 
Any ideas?