Re: LG 60LB7100-UT backlights turn on then go out .

Use Shop Jimmy's LED Tester to test the 6 rows one at a time. I had 2 rows where the voltage on the tester was lower than the other 4 rows. This indicates that there are shorted LED's in those rows. On this model the normal voltage appears to be about 60.2 volts on the 4 good rows. Shorted LED's cause a over currant shutdown of the lamps. The green led on the power supply blinks 4 times indicating over currant also according to the blink code chart from LG.