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If you can please take a flashlight and shine on the screen to see if there are any picture at all when the set is on and has sound.
If you can this means the main board is good as well as the power supply...This model is famous for the LED strips inside the panel to go bad.
The LED strips light up the screen
Requires complete disassemble of the panel to get to the strips. You can find tutorials on YouTube...search how to change led strips
If you are sure your signal connection is correct and have tried to see if there is any action with the flashlight method..you must be sure of this first
Does the screen flash on for an instant when turned on?
It will require taking the back off the set to change the MAIN BOARD CLICK HERE FOR PICTURE REFERENCE
If you have a son or know someone with simple practical skills they could do it for you
Sorry to hear that.
If you are done Please rate positive