Look at the cables that come from the T-con board. They may be dislodged slightly. If they look ok then the screen is gone.
SOURCE: Vizio E70- C3 has black screen as well as horizontal and vertical lines.. Can anyone help. Thank you
Unfortunately, it's probably the controller board, but still could be the power supply board.
Get a quote from a TV repair shop, should be able to quote without bringing it in for both scenarios . Check reviews on the repair shop.
Don't open it up yourself! There are hazardous voltages even when the TV is unplugged!
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