Press on all the ICs that are in IC sockets on the MPU board.

https://pinside.com/pinball/forum/topic/de-jurassic-park-will-not-boot
In the end my problem was the nvram.

Do you have another DMD controller board you can try?

Try taking the batteries out of the holder
Can't use both

You have a DMD controller board in WH20.

In this one picture, you do not show to have the ribbon cable plugged into the top DMD controller board.
pasted_image (resized).png
Can you show a new picture like this showing the ribbon cables all connected? I would definitely try with the WH20 DMD controller board.
2019-02-02 14_20_45-WPC ribbon cable to reseat - Paint (resized).png

I just put nvram in all my games
I can't tell for sure by pics is the nvram installed in the proper direction

It is in the proper direction.

Ok

You can try the RS DMD controller board in WH20. This does look to be a data issue in RS, not a voltage issue.

I had one problem with a game I did two weeks ago
Make sure resister r93 is good

I never used a PinLED DMD controller before. I don't see why it wouldn't work with a ColorDMD unless there is a problem with the board.

Can you post a picture of that manual?

Thanks. I read your comment wrong.

I had a couple dozen dots on mine replaced R93 and fixed it

Page errors or RAM address errors are typically issues on the DMC (dot matrix controller). The PinWiki has a small section on page errors but I think if you're going to play an odds game you have higher odds with replacing the 6264 SRAM on the DMC than any of the ICs involved with page selection.

Note: you can use a low voltage DMD to isolate issues without having to rely on a working high voltage section on the DMC.

R93 should be measuring 1.5k ohms across it. Be sure you are not accidentally touching something else.

I definitely would do this. It is leaning this way toward being the DMD controller board. If it is, might be tough to repair this board. Not sure if PinLED will offer to repair or replace it. If they do, I can see easily being a month with the shipping back and forth to Germany.

The SRAM might be a discrete IC. Their website shows an image of the board with a DIPW-28 socket and an SOIC-28 IC. I don't know their circuitry but the SOIC-28 might be the SRAM. Otherwise the SRAM will be integrated inside the other SMT IC and ... yes ... you will not be able to change that easily if at all.

I bet all the discrete logic ICs of the original Williams design (or equivalent circuitry) are embedded in that SMT IC. Might be an FPGA. I don't know for sure as I have no experience with this board.

A replacement is available @ https://pinballbasement.com/collections/wpc89-boards/products/wpc-dot-matrix-dmd-controller

The CPU writes data into the SRAM on the DMC through the ribbon cable. The DMC duly displays the contents of the SRAM on the DMD.

It is not possible to be certain that a problem is isolated to one board or another without inspecting the data transfer on the ribbon cable or swapping out with a known good on one end. The problem is that the CPU could be writing bad data (the data put out on the bus through the ribbon cable) and the SRAM on the DMC is good or the CPU could be writing good data and the SRAM on the DMC is bad. Or any other combination or possibility of problem.

If I were to bet I would say the problem is on the DMC rather than the CPU. That would be an odds game based on the error you report. There is no conclusive evidence to back up my claim.

Not always. I did have one Williams DMD controller board that turned out to be something other than the RAM on the board.

I was really wanting to see the problem move with the board before suggesting a replacement board. I am glad you chose that board over a Rottendog.

Yes there is a chance the problem is on the MPU board.

Which is why when I make a reproduction board I try hard to keep as true to the original Williams design.

• No schematic is necessary.
• Familiarity with circuit and components.
• You may already have components on hand.
• All through hole design for easy service.

No. Pinside user lordloss or PinballBasement is the proprietor of that store.

It almost certainly outputs the +12V required for the ColorDMD. Some of the plasma displays require this voltage to operate correctly.

<shameless plug>I have a variety of boards that you may be interested in having around as "known good" for comparison or testing. Of particular interest to you might be the WPC-89 CPU board I have. This board supports the standard configuration and with a jumper setting, the removal of some ICs (in sockets) and the addition of a small daughter board will support WPC-S. You can reverse those changes to restore it to WPC-89 standard. An "all-in-one" solution.</shameless plug>

5v,12v, and ground connections for the ColorDMD comes from J118 on the power driver board. You can follow the power adapter from the ColorDMD board to see that. Only thing then that comes from the DMD controller will be the display data when using a ColorDMD regardless of what DMD controller board you are using.

Good reason for me asking this because I just had a chance to go have a look at the board on the PinLED website. I see a lot of questions about their stock picture they show. Their schematic is not matching that picture, so I believe you have a different revision. I wanted to make sure you don't have the ribbon cable to the DMD connected wrong if you do have the one like this picture. https://www.pinled.de/WebRoot/Store31/Shops/87959183/5E0A/5D91/E915/A485/CFD9/0A0C/6D0C/F776/2004017_revc.pdf pasted_image (resized).png

No. I don't have anything color. The only DMDs I have are monochrome. They are ready for consumption by people who do repairs but not quite ready for public consumption. My goal is to have a low voltage (bench friendly) DMD as well a white DMD for my Twilight Zone (and perhaps other machines).

That is why I would like to see a picture of all the boards connected in the game as I had shown. Also, to look over any other differences.

That's understandable.

I make red boards. I only sent out a few green bench testing boards. The board you ordered is from Pinball Basement. It is a re-fabrication of the original Williams design and layout presumably with components recently manufactured. The original board is from PinLED - a company in Germany. PinLED boards have extensive use of SMT.

I have a DMC board reproduction but it does not work 100%. It mostly works but I need to figure out what's wrong with it before making it available.

Normally that is the top left ribbon cable that causes that issue, but seems you are not having the typical failure.

Can you replace this bottom ribbon cable from a working game, from the MPU to DMD controller, to see if there is an improvement? I had many issues in the past with any ribbon cables that have a strain relief built into the cable, as if the male board pins do not go deep enough into the ribbon cable when plugged in.

crappy ribbon cable (resized).png

I'm just saying that I have yet to have a DMD controller board fail with that type of result.

Actually ... that's not chaos. It's ordered. "(col - 1) % 8 = 5" is fixed (either on or off). That provides much stronger evidence that it is a logic problem in the processing of the SRAM than a logic problem in the display itself.