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How do I diagnose a black screen?

I have a Vizio E470i-A0. When I power up, the led lights come on for a split second showing the Vizio symbol on the screen, then goes dark and there is nothing. I did the flashlight test and saw nothing. I tested the 0500-0605-0270 power supply and got readings over 140v at led1+ and led2+ leads. Please advise. Thanks

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irishjfp, Video tutorials links below may help in diagnosing your TV's issue. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.

https://www.youtube.com/watch?v=xDmK12hl...

https://www.youtube.com/watch?v=xUzCLgoS...

https://www.youtube.com/watch?v=CwMjNNKH...

https://www.youtube.com/watch?v=U7hnmJS8...

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irishjfp will be eternally grateful.
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