When needing to convert RGB to VGA, here is what I have found to work with the Golden Tee Fore boards.
This is a GBS 8220 Version 3.0 RGB to VGA converter PCB.
When you have a symptom where you hook this board up and have a great picture for a few minutes and it keeps getting more and more washed out until you cant hardly see the picture then you will need to follow these directions.
Brightness set to 50
Contrast to 52
Sharpness to 05
ST set to 55
SP set to 56
_______________ 1360 X 768 resolution That will get you right on or at least in the range to tweak If you have a picture that shakes then add a 860 ohm 1/4 watt resister from sync to + 5vdc