Default [Q] Sprint GS3 SPH-L710 Dock

G'day all.
I've been searching the net for a while now trying to find a fix for the lack of docking on the SPH-L710. I updated mine to 4.3 (stock) and lost my HDMI to TV.
I'm aware that the developers want people to try different ROM's themselves but I have no screen on my GS3. I was using it as a media player with the samsung multimedia dock and bluetooth mouse/keyboard. I've been using android screncast to look around the phone but I can find nothing to help me.
Does anyone know of a fix or a ROM that works to limit my building frustrations. I've just managed to enable root and disable KNOX if that helps..
Thanks in advance