still getting noise on the lcd screen? If so first try using a shielded vga cable (the thick ones that you find on a lot of older crt monitors, you may also want to cover connections with alloy foil to prevent EMI. If this dsnt work one method i would suggest is using a Magenta Cat5e system however this may be costly for your application. But before trying any of this, you should attempt to remove the source of EMI, a neon transformer is a common culprit. and should be a minimum of 30 cm away from any audio or video devices.