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It sounds like a problem in the high voltage circuit. Had a similar TV set which had the same problem. When there's power leaking from the high voltage circuit, these TV's will tend to cycle on and off. Voltage leaks are mostly caused by accumulated dust for the most part.
When it shuts off does the power light stay on like the unit is still on?If yes,try shining a bright flashlight at the screen and see if you can see any video.If you can your power and main boards are ok.you would then probably need an inverter board or panel.If it is shutting completely off you need a main total assembly since you have already replaced the power supply.The main total assembly is avery common issue on lg lcd tv's.