In my task I'm utilizing a CM2009 IC between true VGA controller and VGA output connector. It is stated in the datasheet for this IC which i can use EMI filters on HSYNC, VSYNC and DDC channels correct just after IC and ahead of VGA connector. Though there isn't any https://gunneruehge.azzablog.com/31350740/getting-my-ac-emi-filter-to-work