And another model but the idea is the same. Only your better TV techs would know this area so you might have to shop around.
Too bad you didn't hear this before buying a power supply. Listen to him around the 20 to 30 second mark.
My LG 55LN5710 TV has a strange issue. After turning it on, everything works great for about 10-15 minutes, but then the screen suddenly goes dark. I still have audio but no video. After some research, I did the flashlight test, and the image is indeed on the screen, its just the backlights that turn off for some reason.
After more research, the "likely" cause was a bad power supply/LED driver. Got a replacement part and did the swap. Unfortunately, the exact same thing happened, so now I'm back to zero.
The unfortunate thing is the TV is only 2 years old, and had only seen about 30 hours of use since we preferred a different room in the house. I'd moved my PS3 over to start streaming stuff to it about 2 days before this happened, so I'm pretty upset about this (it actually worked perfectly the day i hooked up the PS3, so no idea what went wrong).
Does anyone have any thoughts or ideas?