(Topic ID: 33551)

TECH: Tmnt issues - DMD and switch help

By dlbuller

6 years ago

Topic Stats

  • 7 posts
  • 2 Pinsiders participating
  • Latest reply 6 years ago by LTG
  • No one calls this topic a favorite


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#1 6 years ago

My buddy just bought a tmnt. Was working ok until we brought it in. Noticed the ppb board was missing some screws so we attached it back. This is all we did. Seems like something is screwy with the switch matrix. When you push the start button, sometimes the sewer out hole will pop open. The trough coil will not fire. After the sewer out hole opens it acts like a ball is in play. If you hit the out lane switches the knocker will fire. Same with the left bank of targets.

Problem stopping me from checking in diagnostics is the dmd doesn't work. Tested the voltages and the 98 and 101 are about 30 volts high. Does that indicate its out gassed?

Any suggestions on either issue would be great. Anything common?

#2 6 years ago

Try your DMD in a different game if you can, it sounds like a power issues on the high power driver to the board.

The screws you replaced - was the game turned on during this ?

I'm thinking the board may have issues ( cracked traces or something - why it was loose ) or you may have shorted something if power was on during this.

LTG : )

#3 6 years ago

Thanks ltg. I don't have another game with a 128 x 16 dmd. No the game wasn't on when I replaced the screws. The indicator lights on the mpu during the boot sequence are acting like they should. My guess is something on the ppb.

#4 6 years ago

Reflowed everything on ppb. Nothing

#5 6 years ago
Quoted from dlbuller:

Reflowed everything on ppb. Nothing

The board may have been loose for a reason. When you fastened it down, no telling what damage may have occurred. Cracked traces. Broken components.

You might have a project on your hands with that board.

LTG : )

#6 6 years ago

Alright thanks. For the dmd, is a higher voltage An indicator of a gassed out display? Or am I looking at problems with my power driver as well?

#7 6 years ago
Quoted from dlbuller:

looking at problems with my power driver as well?


LTG : )

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