SOURCE: LG 47LB5D - When TV is turned on green light flash
There's no quick fix on your problem because you hava a leaky electrolytic on the supply of the microcontroller.Leaky capacitor affect the regulation of b+ and sometimes works within warms-up but the sympton will get worst. I've rather suggest you to send it to repair shop to isolate the problem because the microcontroller itself is one of the major suspect on this case.
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