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(Topic ID: 216107)

Help troubleshooting WPC DMD Controller power/display issue

By FlippinBallsEric

5 years ago



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#1 5 years ago
OP
 
ZUT

FlippinBallsEric

Flippin Balls

6y 29,900 35

I recently moved my Dirty Harry machine and when I set it up, the DMD was out. When I turn it on, I get a quick flash of a few pixels, then nothing. Everything else is powered and working - the game plays, just no display. I have checked every cable and connection inside the backbox and the playfield. Everything seems to be tight and properly seated. I did notice that the LED on the wpc controller is not lit however, so I tested the gray wire on J606 on the controller - I'm only getting about 2 volts to that board. Anyone have any suggestions on what I can test next - considering I dont have another controller board to swap out.

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#2 5 years ago
 
CLY

Cycloneman

Inactive member

US Detroit, MI

8y 36,150 649

OP
Quoted from FlippinBallsEric:

I recently moved my Dirty Harry machine and when I set it up, the DMD was out. When I turn it on, I get a quick flash of a few pixels, then nothing. Everything else is powered and working - the game plays, just no display. I have checked every cable and connection inside the backbox and the playfield. Everything seems to be tight and properly seated. I did notice that the LED on the wpc controller is not lit however, so I tested the gray wire on J606 on the controller - I'm only getting about 2 volts to that board. Anyone have any suggestions on what I can test next - considering I dont have another controller board to swap out.

i assume you reaseted all the ribbon cables and checked fuses,go ahead and try swapping the controller board and see if anything changes.post back your results

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#3 5 years ago
 
ABC

Crash

Pinside member

13y 141K 14,139

OP
Quoted from FlippinBallsEric:

I did notice that the LED on the wpc controller is not lit however, so I tested the gray wire on J606 on the controller - I'm only getting about 2 volts to that board.

The original poster already indicated the issue. I am assuming that is the 5v logic power feeding the DMD controller. Trace the wire back and reseat any connectors it ties in to. Does everything else work in the game? As in does it boot and does the sound work? Your high voltage is good or you would not see the dots flash.

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#4 5 years ago
 
CLY

Cycloneman

Inactive member

US Detroit, MI

8y 36,150 649

Quoted from Crash:

The original poster already indicated the issue. I am assuming that is the 5v logic power feeding the DMD controller. Trace the wire back and reseat any connectors it ties in to. Does everything else work in the game? As in does it boot and does the sound work? Your high voltage is good or you would not see the dots flash.

ok,i just wanted to rule out the ribbon cables then we can start testing volts and see what measurements he gets.

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