TCL 55C803 Roku TV. Blank screen, but blacklight is on.

TCL 55C803 Roku TV. Blank screen, but blacklight is on. I have a 55 inch TCL 55Ç803 Roku TV that I found at someone's curbside for trash. The remote and power cord was included. The unit is very clean and no physical damage, so I optimistically brought out home for testing. ANSWERS:
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