Chem I'm almost 100% certain the sync issue is only related to the xbox, and to our manual sync monitors. I just tested the dc with the other hackbox I got from lem (thx again buddy). I played through the first 2 levels of Castle of Shikigami 2 and left it on attract mode for about an hour after that. Zero sync problems, and no black screen.
when switching from the vga to a pcb, did you make sure the vga was unplugged? a couple weeks ago, the first time I tried to do that I forgot the vga was still plugged in, and had a bitch of a time trying to get the settings all back to normal. Just the other day I changed some buttons and the stick on my blast and wanted to do an input test, so I threw in a cps2 board, this time made sure the vga wasn't plugged in and flipped the proper switches, the cps2 board (and controller input) worked fine. I immediately unplugged the cps2, threw on the vga again, and flipped the right switches and everything synced perfectly, no adjustments whatsoever.
as far as the xbox goes, I'm wondering (and 300wins mentioned this also) if it is some sort of screen saver. I turned off the screen dimmer in the xbox settings menu, I need to try to turn it back on and see if it still has an issue, but I want to enjoy the dreamcast on there a little more, gonna play under defeat
