In my venture I am utilizing a CM2009 IC between precise VGA controller and VGA output connector. It can be pointed out during the datasheet for this IC which i can use EMI filters on HSYNC, VSYNC and DDC channels ideal immediately after IC and in advance of VGA connector. https://simonfczbz.tinyblogging.com/getting-my-emi-emc-filter-circuit-to-work-74979393