I don't have a video on LG 55la6200 TV or on 32ln5100 TV
ok, but check all the LEDs again, and you should check that the one you replaced must be of the same voltage, and check the voltage with an oscilloscope, if there is no voltage you have to check the switching oscillation of the drivers whether it is transistors or mosfet .
I checked the LEDs one by one, 2,6v are just I see that the circuit is not oscillating, only 87 vol arrive but the voltage does not increase that is the same that reaches the mosfet. but 0 tension in the connection of the led.
Is there a signal from the main to activate the oscillator? I do not have an oscilloscope to see only with the frequency meter of the meter.
Friends, the main board was defective, it does not send 3.5 v to activate the driv on and it did not oscillate, place 3.5v on that connector that goes from the source to the main board and turns on the backlight but there is no video. So that main board defective, I bought another changed and ready.