You might be able to verify by taking a fairly bright flashlight and aiminig across your screen when it does shut off. If you can see the image, it's probably the inverter.
If you've tried an external monitor and it does the same thing, it's probably the video card (hopefully yours is the replaceable kind.)
Six screws on the bezel and carefully pop it off. The inverter is on the bottom of the screen. I just replaced a broken screen on that exact model.
Testimonial: "Thank you. I will try that next."
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