In my venture I'm using a CM2009 IC between true VGA controller and VGA output connector. It really is pointed out from the datasheet for this IC that I can use EMI filters on HSYNC, VSYNC and DDC channels suitable soon after IC and in advance of VGA connector. Even https://sethdwmao.arwebo.com/54099498/fascination-about-emi-emc-filter-circuit