Pinball Help

The adventures of a pinball enthusiast (all original content)

Replacing a DMD on Williams Slugfest Pitch and Bat game

Posted on 2020-04-21 by admin

I’ve had this game sitting around for awhile and finally got around to looking at it. I shot a few videos awhile back and forgot to publish them, so here’s a useful short video on how to access the DMD in Slugfest. It’s nowhere near as easy as you’d expect as it is in a regular pinball machine.

Fixing a dead dot matrix display board

Posted on 2011-11-02 by admin

The other day the DMD just went “poof” on one of my machines. After doing a little research, and checking connections and things, I realized the DMD board died. In this installment, I walk through the process of rebuilding the power supply-portion of a Bally/Williams WPC DMD board. In part 1 I describe what I’m doing and introduce you to the tools I’m using.

Next up, let’s talk about using a meter to check circuit board traces as we go along..

Desoldering and replacing components.

Now the moment of truth! One thing I want to add is pay very close attention to each item you are replacing on these boards. Two diodes, capacitors or transistors may look alike, but have slightly different values or part #s. The three power transistors and the diodes are not all the same. You may have to bust out a magnifying glass to note the different in the markings on each part. This should also be cross-referenced with the schematics and/or parts list from the game manual.