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klight. That was my problem: the LED backlights didn't work but I could see the "No Signal" picture using the flashlight. So I took the TV apart and found that the power board was working for all supplies except the LED backlight. Found a bad fuse and replaced it, it popped immediately. Don't have the expertise (yet) to diagnose the power board, but found it at a good price. It showed up two days later, and now the TV is perfect.
The actual repair is easy enough, but you have to be careful tracking all the screws, as there are varied sizes and various locations, so take notes if you attempt the repair! Watch some videos, too, as it really simplified things. Read Less