Un55eh6000f

[damen]

I think that's one of the models that if you unplug the cable from the power board to the main board the backlights should come on when the set is plugged in. Quick way to tell that the power supply and LED's are good.

[JohnCT]

Damen is correct: if you unplug the harness between the main and the power supply and plug in the AC, the power supply will turn on (pull up resistor on power supply) and the back lights will come on if both the power supply and the LEDs are good. If the LEDs turn on, the main is the likely problem. Eeproms aren't that common in these. I have the .bin file for the 5000 main if you want to try it and you have a programmer.

Now, if the back lights don't come on with the harness between the supply and the main disconnected, unplug the AC and unscrew the power supply from the back of the display. Isolate/float it from the back of the display by laying it on a thin cardboard box, a thick towel, or some other insulator. With the main still disconnected and the LED harness still connected, plug the AC back in.

If the back lights now come on, you have one or more LED strips inside the display that have arced between one or more LED chips through the isolation coating and shorting to the metal heatsink back of the strips. Resist the temptation to permanently mount the supply off the back of the display using plastic mounts as the LEDs will fail further in a short amount of time.

If the back lights still don't come on with the power board isolated from ground, then check for high DC voltage on the TP point and the GND point near the LED connector. If there is 200 plus volts there, then there are one or more open LEDs inside the display.

If there is no voltage at that point, the power supply is bad.

John