(Topic ID: 266247)

Weak DMD: Is it fixable?

By uphamj

4 years ago


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  • 42 posts
  • 6 Pinsiders participating
  • Latest reply 3 years ago by Clizifer
  • Topic is favorited by 1 Pinsider

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#1 4 years ago

I have been working on a TMNT and have it playing again, the bigest issue I have is the DMD seems weak so does not display properly. Is this fixable or do I just wait it out until I am able to fork over the cash for a LED DMD?
I have replaced the original Power board with a new rottendog since the 68 volts was out on the original.

20200411_165535 (resized).jpg20200411_165535 (resized).jpg
#3 4 years ago

That was my thoughts but figured I would ask and see if anyone has any magic fixes.

#5 4 years ago
Quoted from Clizifer:

i'm having this same issue with a data east batman machine. after being turned on for a few hours it starts to get better and is almost 100%. could mine be a different issue or is my display dead as well?

Mine is the same way, if I leave it on for awhile it gets a little better, may have to do with temperature as well.

Even though I put in a new power board I am going to double check the voltages at the DMD and see what they are.

#11 4 years ago
Quoted from PinballManiac40:

Can you measure the resistance (power off) of R95 and R104 on the back of the DMD, just below the J2 connector. These are 33.k 1/2 watt resistors. They should measure within 5% of that, even when still installed on the DMD.

I checked my voltages and all are where they should be. I did Ohm out the resistors and they came out to 32.7 and 32.8 K ohms.

So when the display gets bad enough and have some extra funds may just have to bite the bullet and buy a new LED DMD.

#13 4 years ago

Sure no problem:
This is off the power board connector with the DMD plugged in:
+5 = 5.04
+12 = 12.25
+68 = 69.8
-110 = -113
-100 = -99.3

3 weeks later
#41 3 years ago

Yeah I am holding out, and of course for mine anyway it seems to be better with the warmer weather so for the most part it is fine and does not bother me too much.

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