In my project I am employing a CM2009 IC between actual VGA controller and VGA output connector. It is stated while in 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. Though https://neetclass11physics28271.dm-blog.com/31282323/getting-my-emi-emc-filter-circuit-to-work