I get sound but no picture
It will show shadowed like images
shadow on a dark screen?. Shine a flashlight at an angle against the screen just to make sure we understand you correctly. If you see shadows, silhouettes it is your backlight that is not turning on. This is commonly caused by a bad power board or a bad backlight array. You would have to remove the back cover from your TV and take a look at the power board etc. Check for obvious damage like charred or missing components. Post some good pictures of your boards and interconnect cables so that we can help you further. You an check the LED output voltage with a multimeter and need to let us know what voltages you get. We will also need your TV’s complete model number so we can try to see if schematics etc. are available.
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