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We have an LG LED smart TV model 50UM6900 that has a black screen but the red power light on the front flashes a few times when powered on. Any television that has sound but a black screen, the very first thing you should do is put a flashlight up against the TV screen and see if you can see any type of image or words on the screen.
If you can see an image on the screen with a flashlight then that means in most cases that you have a bad backlight strip.
In this particular LG model we will identify the bad backlight strip and replace the individual LED lights that are bad and causing the television to have a black screen with sound problem.
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