It could be a flaky cable as well.
Hey Mike...
Let me tell you a story. My BB1 dual screen had a bottom monitor issue. It worked great and over time developed a problem, it would flicker, it would be sharp and bright and then go dim. If I opened and closed/slammed the door it might help sometimes. One day it went dark...
I read and read and read on NLG to find a similar issue. I was ready to order parts, a board, a monitor...
I found a post that suggested to check the connections. I traced all my cables, got on my knees, stood on my head, everything checked out. I pulled the Molex from my backplane that went to the monitor and noticed one connection/pin was dark/brown like it got hot...
I made sure that Molex was plugged in solid and the monitor came to life. YEAH! Then it started doing the same thing, dimming. Again I pulled that Molex and squeezed that pin to make a better/tighter connection and plugged it back in securely. That did it. My screen was bright and functioning as expected.
Check and double check your connections.
Greg
PS...I found a WMS chair amp but am still hunting for the 2 harnesses. I might need to make my own. I might have some questions for you. Thank you again for those manuals I got from you...GB