In my job I am using a CM2009 IC between true VGA controller and VGA output connector. It's pointed out in the datasheet for this IC which i can use EMI filters on HSYNC, VSYNC and DDC channels right just after IC and right before VGA connector. Though there are https://erickbulap.designertoblog.com/62669742/the-basic-principles-of-fn3258-130-35