39LN5300 with black screen, no image with flashlight

39LN5300 with black screen, no image with flashlight

I have a LG 39LN5300, manufactured 2/2014, with a black screen, but with sound (static). I looked at trouble shooting guides and confirmed there is no image even with a flashlight. I replaced the motherboard but this did not solve the problem.  Now I am suspcious of the power supply board, but would like to verify if mine is bad first.  I am able to use  a volt meter.

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