1)
Looks like there's 3 controls (R,G,B levels) to adjust for video levels near the CGA-in socket (3 yellow trimpots).

I'm sure if you turn the one marked 'Green' or 'G' while the fault is present, you should see the smearing change as you adjust the trimpot.
I assume there's some kind of setup procedure that comes with the card?

2)
Assuming the above is setup correctly, it still doesn't guarantee what level of signal is coming out the VGA-out connector, whether it's 1volt or 2volt signals, the modern (non glass/crt) monitors will hate 2volt signals.


I'm sure there's gotta be some forums somewhere that support that CGA-to-VGA card, and associated setups/problems etc etc, or the manufacturers site themselves??