This is a protection circuit that prevents the tv from coming on (to stop damage of the components) ....you need to check your voltages off the power supply and make sure they all read well (EX: 24v12v5v etc). Also look for popped capacitors that would make the values lower than need be for the tv to power on properly.
Once you repair the power supply then you may need to replace other components if needed (EX: backlight inverter)!
Please rate if this helps! :D
Replacing capacitors is ALWAYS the cheaper option, but you need to have experience it, or you'll create more damage than good!
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