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Powers on but turns black after LG logo

Have an LG 55LS5700 with the same problem. I replaced the power board with a different one and didn't help. Measured voltages to the LEDs and they all measured around 18VDC. The LED+ measured 71VDC. I assume they are correct. Measured the voltages on the connector from the video/main board and they appear to be correct but not sure a couple of the voltages. P-DIM2 voltage is 1.2VDC and PWR-ON is 3.4V(board says 24V).

I am hesitant replacing the LEDs because they turn on during power up with the LG logo but have read that they can overcurrent and cause them to shut down. Would think there would be a voltage somewhere that indicates they went into shutdown but don't have a schematic. Any way to tell if the LEDs are in shutdown due to overcurrent? Thinking it could be

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@bgoral42 where did you check those voltages ? First ones look high and second one looks low. Post some pictures of your boards with your QUESTION. That way we can see what you see Aggiungere immagini ad una domanda

No power board schematics available. Once the screen turns off and you shine a flashlight at an angle against the screen what do you see?

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Hi @bgoral42 ,

Try updating the firmware for the TV, via USB and check if this resolves the problem.

To me getting the logo indicates that the fundamentals are there in that the screen works, the backlights work and the power is OK, all to a degree anyway. ;-)

Verify that your exact TV model number is listed in the Reference link to the right of the software downloads as installing the incorrect firmware can brick the TV

I realize that you cannot verify what firmware is already installed in the TV and it doesn’t allow for the installation of the same version or earlier version firmware, but perhaps it is worth trying to install the latest version firmware unless you know that it is already installed. If you already have the latest firmware installed, the installation won’t proceed

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Bill Goral sarà eternamente grato.
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