Weird monitor issue: bright screen, no image, wells-gardner 4900

GrahM

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Just fired up a project cab with a WG 4900. Screen powers on and glows bright white, but no image or game video at all. Flyback seems fine, neck glow is solid. Already checked B+ voltage and it's in spec.

Where would you look next, blanking circuit? Bad socket?

Suggestions welcome!
 
Not sure I've messed with black level before, where exactly do you adjust that on a 4900?
I believe you want to turn it clockwise to turn it down. I also believe if the G2 connection to the neckboard is bad it will go full white (this will be the thinner wire from the flyback to the neckboard)

k4900 black level.png
 
Got it, thanks for the diagram. I'll check that G2 lead and try backing it down clockwise to see if it clears the white screen.
 
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