Sanyo 20EZ-V: Contrast Too High With Video GND Connected

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Sanyo 20EZ-V: Contrast Too High With Video GND Connected

Here's an odd one, working on a Sanyo 20EZ-V with the chassis circuitry populated to accept a standard video signal (e.g. non-inverted)

The image looks good with the exception of the usual side effects of no video ground being connected. When connecting the video ground signal, the image darkens quite a bit and no amount of adjustment of flyback screen, sub-brightness, brightness, nor neckboard adjustments will give a good image.

Image appears to have too much contrast, and the vertical (visually horizontal with monitor rotated) raster is noticeably darker.

Confirmed this occurs with a PCB in a separate cabinet as well.

Any thoughts on where to start looking?

EDIT: same dark image result if the chassis GND is connected to the frame.
 

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