Same problem, fixed it with an 89 cent capacitor. TV is an LG 50PA5500, two and a half years old. Suddenly stopped working...would switch it on and it would immediately turn off. Inspection of the main power board showed C802, a square capacitor at the top of the board between the transformer and heatsksink was bulging at the sides. Found the part, 0.022UF 1.25KVDC, on DigiKey at $0.89 + ~$3 shipping. Replaced, TV working like new again.
If the tv unit goes to safety mode after you turn on that was mean an error was detected. check for bad component parts at y and z sustain board.
SOURCE: my lg 50"plasma tv turns
Look for Bad Capacitors,they will be vented,puffed up on Top if you see any like that they are Bad 1000uf 16v, 2200uf 10v, 3300uf 10v.
SOURCE: I hooked up an LG Home Theatre system to an LG 42
Please check fuse and check for leaky electrolytic caps.
SOURCE: i have a 42" lg
Its either Power supply or your main board. Can't be sure with out doing power checks.
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