I am having the same issue with our Vizio E550VL TV. Does your TV show No Signal on the screen? I was able to get regular AV to work with the Yellow, Red, and White cable to work but none of the HDMI ports would not work. If it does not power on at all it may be the power supply. I had to order the main board to get it to work correctly. Vizparts.com is where you can order it from.
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