ataritoobin
Active member
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.
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.
Attachments
Last edited: