(Topic ID: 290233)

DMD Help (displaying garbage)

By Bax1

3 years ago


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  • Latest reply 3 years ago by northvibe
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#1 3 years ago

Just picked up a LAH and the DMD has garbage on the screen. I have tried different known good ribbon cables and same result. I checked voltages and everything is good except the 68v. it is at 78v. The game does have a brand new rotten dog ps and all test points are proper. Does the voltage run straight to the dmd from the ps? what could cause it to be 78v at the connector? will that harm the dmd?

#3 3 years ago

Thank you. Planned on checking that out. what about the voltages?

#5 3 years ago

had a buddy that said to replace resister 95 which could cause garbage on the screen. Anyone heard of that?

#8 3 years ago

Well got a new rom today and just got a flash of garbage then blank. I’m going to order some new ribbon cables. So the 78v is ok at 68v? Other than that one, the rest are pretty good

#10 3 years ago

The power supply is a new rotten dog. The -112 and -100 are good. Only the 69v is high

#12 3 years ago

right on. I do have the original power supply when I bought the game. it probably needs to be rebuilt but not opposed to doing that.

#14 3 years ago
Quoted from PinballManiac40:

The DMD and DMD controller are also at suspect. You can swap the DMD controller without swapping the display ROM.
If both the display ROM and DMD controller are good on another game, it would just display wrong animations and would do no harm testing this way. You may see long blank screens doing this swap since he display ROM may be trying to access an unused area the other game may have. Still worth swapping as a test.
Again, I have seen DMDs with the same problem as you show. It is a bit harder to swap than the DMD controller or power supply.

right on. I will give it a shot when I get a few.

#16 3 years ago

Well. Pulled out my r&b dmd out. Swapped control boards and the r&b dmd booted fine. The lah dmd still garbage. Even swapped the 14 pin ribbon cables. Should I try putting the r&b dmd back into lah to see if it boots? I just don’t want the 78v being high blow out the good dmd

#18 3 years ago

right on. that is what I am afraid of. so I have already tested it in r&b so will keep looking at things to test on it. might be toast.

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