It could be the t con board, the power supply board, the backlighting, or the display itself.
Don't open it up unless you know what you're doing. There are hazardous voltages even with the TV unplugged!
Testimonial: "Thanks. It turns on. There is backlighting. Hoping its the t con."
Actually, the majority of failures I've seen are the power supply board. There are multiple power supplies on 1 board and if the one that fails happens to be the one that powers the t con board then you will see the same failure.
It's the power supply board that has the hazardous voltages. The rest are safe to handle.
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