First of all, VGA is analog
Are you using HDMI to VGA adapter that converts digital to Analog? If you do you can't, because you need a digital to analog converter. Because VGA is waves and HDMI is 10101010 (Digital), so it's totally a two different things. It's not worth it to get some converter and rare.
Sorry for giving a bad new for you, but you need an HDMI TV...