I have replaced the power supply board with no improvement. The back lights come on for approx 5 min then the top row seems to dim a little then they all go out. If I power cycle the set they will come back on for several minutes and go off.
Inverter board is most likely the culprit since it feeds power to the backlights.
Testimonial: "Thanks for the quick response. But this model LG set combines the power supply and inverter on one board. So when I said I replaced the power supply I changed the inverter too. I failed to mention earlier that there is a red LED on this board that is flashing four times, pauses and four times all the time the set is on."
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