Final Fight playing random sound, WW graphical lines, flipped A board, A board no video

Finally trying to figure out a lot of CPS1 issues I've been having:

I have a Final Fight board that plays a sound sample at startup, and then random samples over and over with occasional video flashes on an otherwise blank screen. There is a jumper from one of the pins under the C board to the interconnect housing, I'm not sure what this is for or if it affects the issue.


I have a World Warrior board that has proper sprites and sound but lines through everything.

https://www.youtube.com/watch?v=XFKu2sQDvHM&feature=youtu.be

I have an A board with no video at all. When a working game is attached it just outputs a bluish-gray blank screen.

Lastly, I have an A board that seems to work perfectly, just with upside down video. It reminds me of a cocktail mode issue on classic-era games.

Any ideas?

Final Fight- Clean and reseat the prog roms. If that does nothing you will want to verify them

World Warrior- Can be many things... dirty connections on the board connectors or eprom sockets, broken solder joints or traces, bad LS245, mask rom or C-board. I would start by pulling the boards and eproms apart and clean everthing. See if any of the problems change after that.

A-board1 - Bjorked...if you can, check the basics on the CPU, power, clock, reset, address and datas

A-board2- Flip that dip.... C5

Sorry, but I have no input on these. I don't work on CPS1 boards other than phoenixing them because of all the custom chip failures on the A and C boards.

bustedstr8 said:

Final Fight- Clean and reseat the prog roms. If that does nothing you will want to verify them

World Warrior- Can be many things... dirty connections on the board connectors or eprom sockets, broken solder joints or traces, bad LS245, mask rom or C-board. I would start by pulling the boards and eproms apart and clean everthing. See if any of the problems change after that.

A-board1 - Bjorked...if you can, check the basics on the CPU, power, clock, reset, address and datas

A-board2- Flip that dip.... C5

Click to expand...

The gameplan is to verify the FF ROMs next time I do some repair stuff.

As for checking the basics on the first A board, I know someone with a logic probe but I've never used it. Is this the right datasheet to check: http://html.alldatasheet.com/html-pdf/121318/HITACHI/HD68HC000-12/909/3/HD68HC000-12.html ? As for the last A board, I checked the manual of some game for DIPs, must've missed that one

Problem with troubleshooting A boards is being able to get to the chips with the probe.

Verified the ROMs, one was wrong. Blanked and reburned it successfully. There seem to be more graphical glitches now, but I get the same sound on boot and it plays random sound samples throughout. When the test DIP is set nothing changes.