i ran into this when i wanted to update a space invaders cab. I was just sure it would be easy to come up with some technology.
First no one in my area was willing to offer up a working arcade CRT.
Finally, I went with raspberry pi which has a config.txt setting for flipping and went with LCD.
Turned the brightness way up on the lcd and in the Pi settings and it reflected super great.
I'm chuckling since I interjected the proverbial Pi reference in the Main area.....sorry!
In this case you are going to have to get a CRT fixed, good luck!