My Apple lightning AV adapter only shows audio and not video using my iPad but works fine using another iPad?

Greetings, Reklaw_W.

Welcome to the Apple Support Communities. We can understand why you’d want to resolve the issue with your adapter only playing sound and no video. 

Were you able to complete the following steps, from the resource you used to reach us? 

“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.” About Apple Digital AV Adapters for iPhone, iPad, and iPod touch 

If so, have you tried testing another adapter?

We hope this helps! Thanks for being a part of the community.

Sincerely.