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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:

http://pages.sssnet.com/test/LG_55LW5600...

Check out the test on page 58-59. Apparently the SMPS and Inverter are OK because the back light came on during test. All i can assume is that its the main board. Don’t want to just spend that money like i did on the T CON board. Need some assistantence from an expert before I take this thing out back and fill it with holes about 9mm wide. Thanks in advance for your time and I eagerly await for you’ll’s advice!

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Mark,

Did you end up figure out the root cause. I seem to have same issue with my TV, same model, does not turn on display, no sound. On switching on this set red LED comes on and flashes once and end up as white.

Even I suspect T CON board as culprit but haven't run any of tests.

Cheers

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@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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So F101 and F501 have 328 V while performing test 1. On test 1 page 58 part (a)...all 3 have proper voltage.

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If you refer to the same manual on page 62. I’m only getting 55.8 volts at those three points not 63 volts

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Yes, same manual. Let's see what it does. Probably your backlight circuit.....

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Let’s see what what does?

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I should mean that the colors were distorted for ten or 15 minutes before it faded to black.

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