I work with LCD monitors often but the flat screen ones like for the IGT G23's or WMS BB2's.
It takes a lot careful patience to repair them.
I can only imagine the difficulty being much higher of trying to work on curved screens! Ugh!

Usually, it's one of five things...>>>
An oxidized pin in a video cord, a bad AD board, dying backlighting lamps, bloated caps in a ballast, or a dying LCD panel.
All of these above are like a lightbulb - they don't last forever.
Most LCDs have a lifetime expectancy of about 50,000 hrs.
One year in a casino, ON 24/7, uses up 8,760 hrs.
So it'll last about 5.7 years...well, yours is just about had it by now.
Is there a date on a label somewhere?
Make a video of your repair job!
I've never seen anyone take one of those curved ones apart.
I'm wondering if they're really any different from a cheap 27" Wamart Curved TV LCD screen panel or not.
I'll betcha there's no difference in the internal lighting parts...lol
Look at this deal!...>>>
https://www.walmart.com/ip/LS27D36DGANXZA/13606001665?