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LG led has black screen of death

LG led has black screen of death

Please help me peeps. i have a 55” LG led model #55LW5600. The screen literally faded to black as we were watching. Here’s what I’ve determined so far. The flash light trick does NOT work. There are no back lights what so ever. I ordered a T CON board prematurely thinking that was the problem. I was wrong. I tried the hair dryer trick on the main board with zero success. Check out this link:

ANSWERS:

"@sprinklerman if you check on the test and your backlight turns on while applying the jumpers, I would think it is your power supply that doesn't get the signal to turn the backlight on. Of course you checked F101 and F501 for proper voltage as indicated on page 55. You need to let us know if you had the right voltage going to the main board while performing test #1. Your main board is usually one of the last causes of a totally black screen.

Update (03/08/2018)

added location and layout of Q504"

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