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?
da oldturkey03