Misschien geeft dit ideeën:
https://nl.ifixit.com/Answers/View/608786/Samsung+TV+Backlight+Doesn't+Turn+on+but+there+is+Video+and+Sound
https://nl.ifixit.com/Answers/View/608786/Samsung+TV+Backlight+Doesn't+Turn+on+but+there+is+Video+and+Sound