I removed all the main board connections except for the LCD screen one at a time and started the 1680 up each time to see if I could isolate the issue to one board. The screen still misbehaved with only the main board and LCD powered up. I will look closer at CN6, IC11 and the connections of the contrast board. At this point I feel like they are the most likely candidates for video gremlins. It may get to where I look at replacing the entire main board because I cannot pinpoint where the problem(s) lie(s).
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