Model# UN55D6000SFXZA Samsung Smart Tv. After a storm the other night my TV went black. No sound and no visual picture but I do see a no signal image with a flashlight.

There might be a problem with the connection or an processing issue with the pannel and the processing board then. Or the TVs screen is no longer working.

Possibly storm damage to the main board.
Check your household insurance to see if it covers storm damage with a view to a replacement tv.

Check voltage at the power board. After 120 volts enter the TV, there is fuse then a small high voltage transformer, then a 100 uf rated at 450 volts capacitor. There should be 390 volts DC at the capacitor. Without this 390 volts the TV will shut down.

Hi there
I would go to menu on the remote , from there to picture go down the list, if you do not find anything there to help you. Go to Support and to the E manual .
Kolbrun

LG 42LS5700 - LG.com

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Here is what to check when your TV is turned on, power light is ON, but no picture is seen or sound is heard:

1 - Be sure the component you are using (Xbox, Cable, SAT, ROKU) is turned ON.
2 - Check to be sure all cable and cords are securely connected to the TV inputs and component outputs.
3 - Make sure you are on the correct input as some TV's will show a black screen if there is nothing connected to that input.
4 - Unplug the input you are trying to use from the TV (such as an HDMI Cable) and plug it back in.
5 - Check for signs of damage on all cords and cables from the TV to all components.
6 - Make sure the TV is not in ENERGY SAVE MODE, press the button on the remote control to go back to normal mode.
7 - Unplug the TV for 10 minutes to see if there was a temporary one time issue with the TV.
8 - Disconnect the TV from power for 2 minutes, then when plugging it back in PRESS AND HOLD THE POWER BUTTON ON THE TV FOR 10 to 20 SECONDS to try and force the TV to reset.
9 - If after checking all these different issues, you may have a Faulty Power Supply Board, A Bad Capacitor on the Power Supply Board, Loose Wire Harness, or Loose Ribbon Connector in the TV itself.
10 - Most likely when a TV has the power light ON but NO PICTURE and NO SOUND, it is the Power Supply Board that has failed.

BTW, here are solutions for you to play iTunes movies on Samsung smart TV

It could be your mainboard. How long did you have the TV?

eithor the flyback just craped out or the tube went
try turning up the flyback failing that call a service tech and ask for a quote
quote cose 30-50 bucks
atleast you will know forsurre if it's worth fixing

either bad Y buffers and y board or also could be just a few bad capacitors on the power supply, if you want you can do a visual of the power board caps will appear swollen on top and are easy to solder in cost about $1 each

I’m happy to help further over the phone at https://www.6ya.com/expert/eric_ab7c09ec01841771