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Hi! My name is***** am the expert who will be assisting you today.
If you press the menu button, can you see the on-screen menu ok?
If you cannot see the on-screen menu then the display has likely failed, and a repair would be costlier than a new TV.
Please let me know if you have any further questions on this topic and I'll be more than happy to help.
Have a good day and stay safe,