Usually there are sync settings in you surround system receiver and in some TVs. Are there any and have you tried them? My Sony surround has a limited option: A/V Sync Y/N My Samsung smart tv will allow me to manually set the sync in increments of 1ms.
Yes, my receiver does have the option to manually adjust the ms in av sync, but the problem only happens when watching a 3D movie on my PC source. 2D is fine, and I don't want to mess up 2D sync as well.