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Hello, and sorry you're having problems. Can you please get me the model number off of the back of the set?
Offhand this is a fault in either the Mainboard or Power Board of the TV, which I've encountered many times with different brands (LG, Samsung, Sony, etc.).
Also, are you looking to repair the set yourself, or are you looking for a repair estimate and TV service locator please?
Are you able to see my reply?