Black screen, audio, no backlight. What's wrong?
I ran the flashlight test and could see the menu. Replaced the power supply board with no improvement
Televison & Video - Vizio - E420I-A0 42" LED TV 1920x1080, 120 Hz, HDTV
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Answers & Comments
This is most likely a failure of the actual LED strips themselves. They do attach to a board at the edge, it could be the board but you have to order the board and strips as one unit.
http://www.shopjimmy.com/lg-lc420dug-jfr1-led-strips-10-strips-1-board.htm