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Hi , I`m Jack an independent Tv/audio repairman with 40 years experience. Perhaps i can help you with this , please let me know when you see this.
Sorry , had to step out for a bit
Is the screen just blank with some background light or completely dark like when the tv is off ?If you`re not sure then darken the room and turn the tv off and on again while you observe the screen .Can you see the tv`s own menu for example ?