No picture but have sound from iPhone hdmi to tv

Hi there, Rsummers2.

Check out the steps below as those steps may resolve the issue you're having with no video showing:

"If you need help with other issues

1. Disconnect and reconnect your adapter from your iPhone, iPad, or iPod touch and from your TV, monitor, or projector.
2. Make sure that your VGA or HDMI cable works, since the issue could be with the cable.
3. Remove any VGA or HDMI extension cables or converters. Accessories that convert a VGA or HDMI signals to different video formats (DVI, Composite, Component) aren't compatible.
4. Make sure that you have the latest version of iOS."

Those steps, and further information, can be found here: About Apple Digital AV Adapters for iPhone, iPad, and iPod touch - Apple Support

Take care!