Are the DMD controller voltages good?
http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Testing_DMD_Controller_Power
(Topic ID: 241908)
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Does it say "RAM test OK" at the end of the display test? That PinWiki WPC DMD section indicates that bad or faulty RAM at U24 can cause a myriad of display issues.
Or you can try ordering the WPC High Voltage repair kit. It says it's out of stock, but that at least shows you the parts needed:
https://www.greatplainselectronics.com/proddetail.asp?prod=WPC-HVP-KIT
Something similar can also be ordered here (about 3/4 the way down the page). This one includes the capacitors:
http://lockwhenlit.com/products.htm
Or you can order a new board:
https://ksarcade.net/rottendog-wpc-dot-matrix-dmd-controller-dmd089.html
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