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Why is my screen grayish black when I turn it on?

Why is my screen grayish black when I turn it on?

I have a 65UH6030 LG LED TV when I turn it on its just a gray and blackish screen. I just replaced the main board in the TV and still the same issue. I did the flash light test and didn’t see no image. When I took the back cover off and plugged it in the LED backlights seem to be working. It has sound but no image.  I need more ideas then just replacing all the boards and led backlights. What is the issue?

ANSWERS:

@dcochran86 since you already replaced the main board and you have backlight on, it could be a T-con issue. I’d replace it just to make sure. It’s not to expensive and consider purchasing from a place that has a good return policy just in case…..

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