The screen on my iPhone XS has gone blank but the phone is working

So I'm not sure what your issue is. You posted that your screen isn't working and sberman posted a link for dealing with a screen that is not working, you respond by saying the screen is working and that your problem is solved and now you say your screen is blank.

If the screen isn’t working on your iPhone or iPad - Apple Support

Try this, If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support

So your problem is now resolved?

In that case click on the blue letters in the post by sberman, they are a link and will take you to a knowledge base article that may resolve your issue.