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Sound but no picture and won't turn off

Samsung UN55H6203AFXZA 55" HD Smart TV

The back light is working but no picture and won't turn off but I do have sound. This TV is 2 1/2 years old

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Sorry for delay, had to get help to remove from wall. Im not seeing any obvious damage?

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Not sure I posted pic's correctly?

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@stella88 "no picture and won't turn off" this sounds like an issue with with either an IC or MOSFET on your power board. Unplug your set and remove the back cover. Take a close look (try not touch anything yet since the caps are still charged) at the power board for any obviously damaged part. Post some images of your boards with your question. That will allow us to see what you see. Use this guide for that.

Update (08/13/2017)

@stella88 measure the voltage on CNM803 as well as CNL802. Set multimeter to DC voltage somewhere in the 50V range. Use the voltages listed on the board as reference. Right now it definitely sounds like a bad main board. I do not have access to the service manual right at this time but do you have one more board on your set? Is it just those two boards? The usually way to check it is from your powerboard==>LVD's cables/T-Con board==>Mainboard.

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Yes, there are only 2 boards (pic.s in prior post). If I want to replace both boards do you have suggestions on order #'s

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@stella88 looks like BN44-00774A for the power supply and BN94-07727D for the main board. Total cost around $100USD

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