punch-out bad color prom?

mrbill2084

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Friend brought over his punch-out yesterday for me to try to fix. He thought it was bad monitors, but his monitors actually worked(they need to be adjusted).

But he did have a problem. The top monitor was missing blue. When he brought it over the top monitors color inverter board was removed off its pins and its back was lying on the monitor frame. (He did transport the game on its back, so it could have fallen off on the ride.)

I checked the top monitor and it works fine. Traced all the wiring back to the video board and its fine. I would guess its a bad blue color prom.

My questions are, what isthe chip location of the blue color prom? Can the chip be taken from another nintendo board (I have a few dk, dkjr, popeye, mario ect).

If it can't be pulled off another board, does anyone burn the color proms?
 
had this same problem myself a while back. Pretty sure you couldn't swap them from other nintendo boards. Stephen from hobbyroms.com can get you what it is you need. Got a whole new set for about $40. hope this helped.

Brad
 
i lost green on my bottom moniitor on my PO. Turned out it was the filter board. If its still there, tryremoving it and plugging the harness straight into the pcb and see if your color comes back.
 
I've been fighting this same problem. The color PROMs are on the smaller top board (the one labeled BAK). There's 4 ROMs and 6 PROMs on this board that control the colors. 2 ROMs and 3 PROMs for each monitor.

Here's where it gets tricky....
I have one board marked CHP1-02-BAK (I assume a revision "2" board). It has four 2564 EPROMs at location 4A, 4B, 4C, and 4D....these are all stamped with a "b" suffix. The six bi-polar PROMs are all 82S131...and also stamped with a "b" suffix.

My other board is marked CHP1-01-BAK. It has two 2763 EPROMs at 4C and 4D....and two 3864 masked ROMs at 4A and 4B. All four of these are stamped with an "a" suffix. These are not interchangable with the other boards 2564s. The six bi-polar PROMs are 82S131...and stamped with a "b" suffix.

The bi-polar PROMs between the two boards are marked identical, but they are not interchangable. The code on the PROMs isn't the same. PROMs 7E, 8E, and 8F is different (even though they have exact matching Nintendo numbers stamped onto them).

ROMs 4A & 4B and bi-polar PROMs 7E, 8E, & 8F control the bottom monitor.
ROMs 4C & 4D abd bi-polar PROMs 6E, 6F, & 7F control the upper monitor.

I keep meaning to e-mail Steph about this...I'm curious if he's ran into this issue.

My long winded point....not all Punch-Out bi-polar PROMs are the same....even though they have the same part number stamped on them. Depending on what ROMs you have in 4A and 4B (2564 EPROMs or 3864 masked ROMs) effects what bi-polars you need for 7E, 8E, and 8F.

Edward
 
I've seen quite a few PO boards and I'd say half had bad color proms.

I've tried to find a lot of the different revision EPROMs and haven't come across a different set of proms yet. The SPO manual references them, where it says one version has a white and the other has a red(pink) label, but usually they are so faded I can't tell what color they were.

Elutz is it possible to get a dump of your proms. Also, do both boards have the same rev EPROMs on the CPU board.
 
serious knowledge.. thanks! I didn't know PO had so many video problems. Glad someone knows the boardset. I would never have suspected 2 versions of the video board.

I will go simple first and remove the filter board(did not know you could do that on nintendo boards as I have zero in my personal collection).

Need to check which version of the board thats in there if I am going to order color proms.
 
I've seen quite a few PO boards and I'd say half had bad color proms.

I've tried to find a lot of the different revision EPROMs and haven't come across a different set of proms yet. The SPO manual references them, where it says one version has a white and the other has a red(pink) label, but usually they are so faded I can't tell what color they were.

Elutz is it possible to get a dump of your proms. Also, do both boards have the same rev EPROMs on the CPU board.

I finally had a moment to check my boards...

On my CPU boards...I've got 01s and 02s. They both appear to have the same EPROMs. The EPROMS are stamped "e" and some "e-1". The 01s and 02s seem identical.

On the video boards...I have 01s and 02s. These are different.

On the 02...
6N, 6P, 8N, and 8P are 2564 EPROMs
2R, 2T, 3R, 3T, 4R, and 4T are 27128 EPROMs
2U, 2V, 3U, 3V, and 4U are 2764 EPROMs

On the 01...
6N, 6P, 8N, and 8P are 3864 masked ROMs
all others are the same as the 02 version

The 01 and 02 boards can be mixed( so it seems) without issues....

On another note, I did notice a slight redish hue to the 01 bi-polar PROMs.
And sorry, I don't have anything that can read these bi-polar PROMs (or a lot of these other oddball things...2564/3864/2763---what the hell is that).

Edward
 
I've been fighting this same problem. The color PROMs are on the smaller top board (the one labeled BAK). There's 4 ROMs and 6 PROMs on this board that control the colors. 2 ROMs and 3 PROMs for each monitor.

Here's where it gets tricky....
I have one board marked CHP1-02-BAK (I assume a revision "2" board). It has four 2564 EPROMs at location 4A, 4B, 4C, and 4D....these are all stamped with a "b" suffix. The six bi-polar PROMs are all 82S131...and also stamped with a "b" suffix.

My other board is marked CHP1-01-BAK. It has two 2763 EPROMs at 4C and 4D....and two 3864 masked ROMs at 4A and 4B. All four of these are stamped with an "a" suffix. These are not interchangable with the other boards 2564s. The six bi-polar PROMs are 82S131...and stamped with a "b" suffix.

The bi-polar PROMs between the two boards are marked identical, but they are not interchangable. The code on the PROMs isn't the same. PROMs 7E, 8E, and 8F is different (even though they have exact matching Nintendo numbers stamped onto them).

ROMs 4A & 4B and bi-polar PROMs 7E, 8E, & 8F control the bottom monitor.
ROMs 4C & 4D abd bi-polar PROMs 6E, 6F, & 7F control the upper monitor.

I keep meaning to e-mail Steph about this...I'm curious if he's ran into this issue.

My long winded point....not all Punch-Out bi-polar PROMs are the same....even though they have the same part number stamped on them. Depending on what ROMs you have in 4A and 4B (2564 EPROMs or 3864 masked ROMs) effects what bi-polars you need for 7E, 8E, and 8F.

Edward

I haven't seen this posted anywhere, so I'm resurrecting this thread...

Just want to note this somewhere. The Rev 1 and Rev 2 schematics for the BAK board have 2 components changed, the chips at 5E and 5F.

Rev 1, 5E & 5F = 74LS158, use the PINK prom set from MAME
Rev 2, 5E & 5F = 74LS157, use the WHITE prom set from MAME

Hope this helps someone if they search the forum for Punch-Out color proms. Feel free to jump in if I missed something and I'll update my post.
 
I haven't seen this posted anywhere, so I'm resurrecting this thread...

Just want to note this somewhere. The Rev 1 and Rev 2 schematics for the BAK board have 2 components changed, the chips at 5E and 5F.

Rev 1, 5E & 5F = 74LS158, use the PINK prom set from MAME
Rev 2, 5E & 5F = 74LS157, use the WHITE prom set from MAME

Hope this helps someone if they search the forum for Punch-Out color proms. Feel free to jump in if I missed something and I'll update my post.

Here's some info I posted you might find helpful or interesting:
Link1
Link2
 
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