TROUBLESHOOTING
https://julietapp.blogspot.com/p/troubleshooting-general.html

This app allows you to keep the screen always on.
The service is persistent so it will remain active even if you exit the app.

Features and Benefits

• Persistent service: Background service
Autostart on boot and after update
• Ability to disable the service if the screen is locked
• Ability to enable the service even during a call
• Ability to enable the service only during a call
• No root
• Easy to use