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Help me try and resurrect this CPS1 SF2WW JAMMA board.

yuro

yuro

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Hey guys! Love all the community here. Now I'm in need of your help.

I bought this CPS1 board dirt cheap as it wouldn't boot. No sound, no video, but the OSSC says there is a correct 15khz signal and shows a flat black screen.

B and C Board
IMG_2617.JPG

A Board
IMG_2616.JPG

B Board
IMG_2619.JPG

C Board
IMG_2618.JPG

Close up B Board ROMS
IMG_2620.JPG
IMG_2622.JPG

Diagnostic steps done so far:
I have a 12mhz Street Fighter 2 Turbo set. (From here:https://www.arcade-projects.com/forums/index.php?threads/ebay-sfiice-accelerator-not-mine.7939/)

I've placed the WW B+C boards on my working 12mhz A board: No sound/video.
Placed my SF2T B+C boards on the 10mhz A board: No sound/video

The gentleman I purchased it from said the last he saw of it was garbled graphics maybe about 7+ yrs ago.

I know from the ROMs this is one of those "Quicken Pt 1 (or 2)" WW bootlegs.

I do have a TL866II Plus EPROM burner and ten HN27C4096AG-10 EPROM chips.

What would you suggest I do next for troubleshooting?

Thanks guys.
 

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With the CPS1 multi hopefully coming I suspect interest in resurrecting dead boards is going to rise. Not something I know enough about to help, only fixed sound issues on CPS1, so hopefully someone here has better pointers because I'd be interested to see the suggestions myself.
 
Judging by other peoples repair logs. The culprit for a dead cps1 board is usually a messed up custom chip. However, judging by your board...you're missing a lot of roms. 28-31 and 35-38

I don't know what 33-34 roms are, but they look like they're for a bootleg hack version of world warrior.
 
I have an A board here with the exact same fault. Sync is generated by the C custom which is why you still get a black screen.

I tried multiple other B and C boards on it and got nothing so I put it down to a bad custom
 
Just got a SFII’ that has the same issue (black screen and no sound).
Started the process of desocketing everything and doing a few visual/continuity check (looking for lifted/bent parts) but no luck.

Will try swapping boards with the only other working CPS1 I have, Rockman Power Battle.
Is there a danger in doing so?

Here is the Imgur album of the board.

I see a chipped “FN” component on the C board and an Bnet connector on socket 30 but that does not seem to be a problem.

If not the B-21 on the C board, could it be the 68000 on the A board?
 
There's a quick check you guys can make to diagnose quickly a dead CPS-A-01 custom on the A-board.
Just probe pins 107 & 109, if you don't have any clock here the custom is fried.

P.S.: I should take pictures of my piles of faulty CPS1 A-boards.
 
Just to be sure I understand, that means testing using a Logic Probe with the B and C board removed (and A board powered up), right?
 
Cheers :) Been spending a lot of time reading but barely starting all this, so sorry for stating the obvious; it helps me making sure I do things right.
 
rewrite said:
This is good information. Now I have to test nearly 20 A boards...
Click to expand...
This might not be 100% accurate, I see at least 2 examples that could lead to the same result:
- problem in the 16Mhz clock circuitry
- problem in the reset circuitry (that one I'm not sure if it would prevent the custom chip to generate the sub clocks)
 
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Apocalypse said:
rewrite said:
This is good information. Now I have to test nearly 20 A boards...
Click to expand...
This might not be 100% accurate, I see at least 2 examples that could lead to the same result:- problem in the 16Mhz clock circuitry
- problem in the reset circuitry (that one I'm not sure if it would prevent the custom chip to generate the sub clocks)
Click to expand...
Ah, then I can't just use this one quick test to sort between "definite junk" and "At least I know the custom works". They'll stay in their bin for now. Ha.
 
Takosuke said:
I liked the idea not the price :D
Click to expand...
The idea isn't new, I've presented my solution 10 years ago but nobody cared.
I simply use flat cables to move the B-board away from the A-board.
I've also routed PCBs (more durable than hand assembled flat cables).
 
10 years ago is when I fell out of my arcade game, as I left France and donated almost everything I owned back then. Slowly rebuilding and rediscovering things nowadays. A lot has changed.... well mostly prices actually ;)
 
Takosuke said:
10 years ago is when I fell out of my arcade game, as I left France and donated almost everything I owned back then. Slowly rebuilding and rediscovering things nowadays. A lot has changed.... well mostly prices actually ;)
Click to expand...
So you're French? I thought you were from the US and had learnt some French.

[EDIT]
It's hard to see but here's the PCB I routed, you need two of them:

Capture.JPG
 
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Yup, moved to Cali in 2010 and left all my things behind. Still have my console collection (almost everything and several version of them) stores at relatives but gave away my KI2 cab and a lot of MVS and PCBs to my office before I moved.

Hard to see but I think I get it :) What I’m missing in Orange County is enough room for having a proper workbench and space for my cabs :p Girlfriend compromises by having my 2 cabs in my office but not enough room to tinker freely there, so I make due with premade things while I’m getting my feet wet again doing things on my own ;)

Thanks for sharing!
 
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