https://de.ifixit.com/Antworten/Ansehen/272663/My+LG+TV+55lv5500+suddenly+turn+black+with+no+sound+or+picture.
BEANTWORTET: My LG TV 55lv5500 suddenly turn black with no sound or picture. - LG Television -...
jpwinarto this sounds more like a power board issues. You do want to start by checking the power board voltages. Post some images of your boards with your...