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Hello, we need to troubleshoot the issue in TV to determine the cause of problem.
Do you get bright white light (backlight) comes from any vent hole at rear of panel when turn On and have program sound?
If no light visible, please shine a good flash light on front of screen bit closely and observe if faint image of program visible inside screen?
To my understanding your TV has got backlight failure issue and if faint image is visible when shine flashlight on screen then need to replace power supply/ LED inverter board in TV. Please reply back with result to proceed further.