Chosen Solution
My LG 50LN5400 screen goes black after a few millisecond when I turn my Tv on. I ‘ve done the flash light test, I can see the image behind and the sounds works fine. Plz help
Thomas Serra in that case it is a backlight issue. It could be the power board, the main board and the backlight array. Your sereis TV has issues with the backlight array itself. I suggest you remove the back of your TV and check the boads and wiring. Post some good images of your boards with your question so that we can se what you see. Use this guide Adding images to an existing question for that. You will need a multimeter to measure the output of the boards to diagnose the issue.
