Dji camera view on phone is black.

https://forum.dji.com/thread-120596-1-1.html     post # 12

What's the current version of APP and mobile OS? Have you tried to reinstall the APP and login your account to check?

Have you crashed the drone or had a hard landing?
Does the image or video save ok to the sd card?
If no image on sd card then i suggest you check the ribbon cable to see if it is damaged or has a loose connection.
If images are good on sd card then you may have an issue with image transmition or reception.
First thing i would try before you do anything is uninstall and then reinstall dji go app