Super Punch-Out PCB - no blue on main monitor

pc10builder

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Hi guys,
I came across a problem with my new Super Punch-Out PCB that I originally thought was a monitor problem. But after lots of testing, (and monitor swapping, and cabinet swapping) it looks like it is a problem with the PCB.

For some reason, the game isn't displaying the color blue on the main game play monitor. It will display all the colors on the second menu monitor. I've tried swapping monitors, connectors, cabinets, etc. and it dosen't help. (see photos).

Can anyone tell me what part of the board controls colors? Would it be in a particular EPROM chip or capacitor, or what. It should be set up similar to the regular Punch-out PCB if anyone has experience with that.

I do have a working SPO PCB I could try rom swapping with, but it would help to know where I should start.

Thanks
Pete
 

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I'd check the color PROMs first... they seem to always go bad. They're the small PROMs on the top small board.

DogP
 
8f on the BAK board.

BTW, could you tell me what the revision is for the 5 EPROM on the CPU board for your two sets? The revision is written in red, probably faded to pink, and should read e, e-1,f, or something like that.
 
Thanks for the quick reply. I'll try both suggestions tonight and let you know about the revision info.

Pete
 
Been there, Done that!! If you need some help please PM me and I can help you figure this out, Sounds like a color prom but what prom version you need will be determind by the SPO board set you have, the 01 set will use the mame files but the 02 set has a special file set not used by mame. Steph at hobbie roms has both files sets now. If your able to burn Color proms I have the files for both sets too.
 
My working SPO board has a red "e" next to most of the eprom labels. My bad SPO doesn't have any letter by any of the eprom labels. (I've also got a PO parts board but that has "g" next to the eprom label)

So I suppose that means I can't do a rom swap. Can someone tell me which chips to buy from hobby roms?

Thanks,
Pete
 
Before you go do all of that...

Check the socket for a bad contact with the pin... and check the outputs of the color PROM with a logic probe.
 
Like mentioned above, swap 8f on the BAK board. The revisions on the Eproms have nothing to do with the board revision. For completeness though, what is the revision of your BAK board. It is silkscreened on the BAK board CHP-01-BAK or CHP-02-BAK(IIRC it CHP may be something else).
 
Both boards use CHPI-01-BAK and CHPI-01-CPU.

What's wierd to me is that when I swap out the entire PROM set from the SPO working board to the non-working board, is that the color get more off - almost inverted. I tried swapping the 8f, then the screen got really blue. So I tried swapping each of the other chips individually. You'd think that if the chips are working correctly then swapping a chip from one board to the other would have no effect, but each chip I swap changes the color palette.

The only other difference I can see between the SPO BAK boards is that one has mask roms in 4a and 4b, while the other has eproms.

I'll play with it some more tomorrow. I don't have a logic probe, but I'll try and pick one up. Thanks for the advice.

Pete
 
If you can tell, what color are the labels on the proms for each board? ie the row of 6 chips on the BAK board. They will either be white or pink, but the pink has tended to fade.

I think there is more to it then the proms are different between -01 and -02 boards. The SPO manual makes not mention of -01 vs -02 for proms. The manual swaps the proms based on color. I've had a -02 version SPO and it had the same proms as a -01. I haven't dumped all my boards, but I'm not sure I have a board with a prom difference.

4a-4d on the bak board have an impact on color as well so you could try swapping that. Otherwise, you'll need to do some real trouble shooting instead of plug and chug.
 
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