Party Zone DMD Problems

kastawaykid

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I have a party Zone Project that I am working on that has some display problems. The Display currently is missing some of the right side column of characters. Also the screen seems to be oscilating at times (all characters lit, then the proper ones lit every other second). I think the characters may be inverted from what they should be when this is occurring. Is this an outgassing or voltage problem on the DMD? Anyone have any idea Where I should start to try to determine what is wrong? All of the ribbon cables are new. Could it be the CPU board, Display Driver board RAM or DMD bad? This is the only DMD pin that I have, so I have no extra DMD or pinball to place in to test. Please let me know.

Thanks to all,
Kid
 
Here's a great place for you to start.
http://www.pinrepair.com/wpc/index3.htm#dots

I was actually thinking this was it:
Missing Vertical or Horizontal Display Lines are Missing.
Another common problem is missing display lines in the DMD score display. This is very common with the "pin" style DMD display glass. This type of DMD glass has pins, bent at a right angle, that solder into the attached DMD circuit board. Often these pins break, due to vibration, right where they attach to the display glass' edge. Because of this problem, all the DMD manufacturers have changed to a very flat ribbon cable style of connection between the display glass and the attached circuit board. This largely solved the problem.

If missing some lines, and the score display glass is a "pin" style, often the pins can be reattached to the display glass using a conductive silver epoxy. This often works well, but is a difficult repair. It usually does not work if more than two horizontal and/or two vertical pins are broken.

Here's a great visual of how to fix.
http://www.txpinball.com/fixing_DMD_displays.html
 
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