When i turn on the tv it goes on get picture samsung smart logo comos on then goes off and repetly does it again and again....i change the main board the first time because it was doing the same thing...and now with new board doing it again after month used....can be a firmware problem because on the second main that i did put on after a month of use it ask me to upgrade so it did starter to download and upgrade but didnt finish to upgrade and after that it is doing cycling on and off
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