problem with punchout

chips4sle

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hey
i have done a few searches here and still have a question
i have a punchout board that does not display blue on the bottom monitor. i have changed the color prom with one from a working board but then i have blue where the black should be.

somewhere on here it says there are 2 revisions of the boardset
where do i fin that out at on the board
thank you
 
hey
i have done a few searches here and still have a question
i have a punchout board that does not display blue on the bottom monitor. i have changed the color prom with one from a working board but then i have blue where the black should be.

somewhere on here it says there are 2 revisions of the boardset
where do i fin that out at on the board
thank you

Be sure if you are swapping proms you are swapping the right one. The proms for the top and bottom monitor are different.
 
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display

Have your tried hooking up another PCB to the monitor and testing it? Try to isolate where the trouble is: wiring, monitor, PCB, etc. For example you could hook up the current PCB to the other monitor to verify the PCB signal out to the monitor.
 
Everything has been verified that it's the bottom monitor on this board. I also swapped the color proms with the identical ones from another board
 
Everything has been verified that it's the bottom monitor on this board. I also swapped the color proms with the identical ones from another board

Those BAK boards are a nightmare to de-bug. The Nintendo documentation is LACKING at best. They state there's two different versions...a 01 and 02. This, so far, is true. Your BAK board should be screened with that. Version 01 ROMs and PROMs cannot be mixed or used with 02 ROMs and PROMs. A lot of this crap the differentiated by color coding....01 ROMs are white, 01 PROMs are white......02 ROMs are green, 02 PROMs are pink. One problem, all there colors have now faded.....AND EVERYTHING LOOKS WHITE! To make matters more fun, I've seen these things with so many different factory modifications...to use all kinds of oddball memories (yet the retain the 01 or 02 revision markings...when they're totally not compatible). I've also seen (at least) a third set of PROMs that wasn't compatible with the "white" or "pink" versions. At the time, I didn't realize how screwed up this shit was or I would have saved the code. I now have another one of those said boards I can't fix because it's got a bad PROM.....and nobody has a copy of the code to burn a new one.

At some point Nintendo did mark the ROMs with an "a" or a "b".....to designate 01 or 02. Most are red ink of a rubber stamp type....which also has a tendency to fade away.

For starters, see what revision your BAK board is (01 or 02)......then see if the ROMs have an "a" or "b"....then the fun starts!

Edward
 
hi
ok board revision 02
roms are revision b

but i cant change out the color proms
when i change out the color prom 8f for the blue in the bottom monitor it shows the black background as blue but works perfectly right in the other boardset
 
hi
ok board revision 02
roms are revision b

but i cant change out the color proms
when i change out the color prom 8f for the blue in the bottom monitor it shows the black background as blue but works perfectly right in the other boardset

Is this working PROM from an 01 or 02 BAK board?

Edward
 
both board have all the same markings

i even swapped the entire back board to make sure it was a problem with that board and not a cable
 
both board have all the same markings

i even swapped the entire back board to make sure it was a problem with that board and not a cable

So, you've got two 02 boards, but with non-compatible PROMs.....Uugghh.
The ROMs and the PROMs have to work together. Are the ROMs between the two boards the same kind (I believe (most) are 2764s....but I've seen oddball stuff)?

Edward
 
so now i took all the roms off my good board and put them on my other board and they show the same problem. so i think it is a board problem. so what chips work with the blue on the bottom monitor
 
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