Blank Screen
If it has sound, then its back-light has failed which is a service engineers work but may also be related to a screen fault in which case a new set is needed as cost of repair makes it not worth it.
If no sound then dare I say worse and mostly if more than 2 years old, not worth it, sad to say as parts do not linger very long other than major brand names most are generic badges on economy sets.
Hope this helps..........
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