In my venture I am using a CM2009 IC between genuine VGA controller and VGA output connector. It is talked about inside the datasheet for this IC which i can use EMI filters on HSYNC, VSYNC and DDC channels proper immediately after IC and in advance of VGA connector. Though https://eduardodmvem.newbigblog.com/37275863/detailed-notes-on-emc-vs-emi-filter