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We have a LG 42 inch LED TV model 42le5400 that does not have the "Backlight ON" voltage needed to power up the led driver for the televisions backlight. Whenever an LED television is powered on; it needs 2 important Main board voltages/signals going to the Power Supply Board. The first is the "Power Supply ON" or "PS ON" voltage to turn on the voltage rails on the power supply, and the second in the "Backlight ON" or "BL ON" to turn on the LED driver circuit for the TV's backlights. On many older model LG led televisions if you are missing the BL ON/DRV ON voltage, then the TV will come on with a totally black screen and no sound. In many cases all you have to do is heat up the microprocessor IC on the Main board because it has bad solder connections underneath the IC.