19 inch CGA-EGA-VGA-SVGA LCD arcade monitor
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That looks like just a horizontal hold adjustment. Or maybe you have a EGA game hooked up to a CGA monitor? Did you get it working yet?
The monitor may not be getting the sync signal. Check the wiring from the PCB to the monitor and make sure they are good. Check the manual of the PCB to make sure it is wired correctly also.