Chosen Solution
The backlight on my Samsung MODEL: UN46EH50000FXZA LED tv stopped working. I still have sound, and can see an image when I shine a flashlight on the screen.
One of the common failures is of the LED strips inside the TV which provide the back light. It can be a single LED that fails since they are connected in series. i have successfully changed the individual LEDs to repair these recently. If you have a volt meter, check the voltages present on the connector that goes to the panel. There should be both a thin flat cable that carries the video signal and a thicker cable that should carry the LED power. Next to the LED connector there should be markings indicating the pins like L1+,L1- etc. There may be 2 or 4 sets of these labels. Check the voltages at that connector and report back here with the results. Depending upon what you report, we’ll move on from there. Dan