(Topic ID: 238255)

No Fear DMD Not Working

By loren3233

44 days ago

Topic Stats

  • 12 posts
  • 6 Pinsiders participating
  • Latest reply 38 days ago by PinballManiac40
  • No one calls this topic a favorite


Linked Games

#1 44 days ago

I am having an issue with a NF dmd not working. I have checked the dmd in another game and the dmd does light up and work properly. I pulled the fuses on the dmd board and they tested fine, reseated all connectors including the ribbon cable.
I tested voltages at the plug that attaches to the dmd and they appear to be correct.
Orange 122.2 V
Blue 121.3 V
Black 0 V
Black 0 V
Grey 5.1 V
Grey/Yellow 12.4 V
Brown 14.1 V

I also installed a different ribbon cable from a different machine and that did not help. I am not sure what else I can check as I have power to the plug that attaches to the dmd. I have also tried using a spare dmd and that would not light up as well.

Any ideas or what I should look at next? Any assistance would be greatly appreciated.

#2 44 days ago
Quoted from loren3233:

Any ideas or what I should look at next?

Can you try a different DMD driver board ?

Try different ribbon cable from CPU to DMD driver board ?

LTG : )

#4 44 days ago

Should be 62 volts.

#5 44 days ago

Thank you all for the responses. This gives me a good starting point and I will research on why I am not getting the correct voltage. Thank you fellows for the quick response.

#6 44 days ago

FYI. If you go with a ColorDMD, you would not have to worry about repairing the -110v,-100v, or 62v as it will not need those voltages. And the display looks awesome in color.

#7 44 days ago

Or you can send out the DMD controller board for repair. If you want to repair it, there is a list of parts you would need to replace. https://www.greatplainselectronics.com/proddetail.asp?prod=WPC-HVP-KIT

#8 44 days ago

If you find that the board has been overheated beyond repair then you can use this.


#9 44 days ago

There is also this board which replaces a burnt up HV section:


#10 43 days ago

Thanks guys for all of the options, I had no idea so much was available.

Update, I have access to a rottendog dmd board that I can borrow from a friend so I am going too install that to see if it takes care of the problem. If so, I may just get the board repaired depending on the cost or purchase a new board. I will have access to the game tomorrow so I will update you all on what I find out.

Thank you again for the responses.

#11 38 days ago

Rottendog was installed and dmd is now working, I plan on having the board that was removed looked at by Rob Anthony at GSPF to find out if it is repairable. Thank you again for the information provided.

#12 38 days ago

You can post pictures of the front and back of the DMD controller board. It is rare these are not repairable.

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