Unfortunately there is no way to defeat this behaviour. The manufaturers assume that if you are making use of the headphone jack it is because you do not need to make use of the internal speakers. Normally a person will connect headphones because they need to cancel out the noise of the built in speakers due to a need for quiet, or because someone else in the room does not want to hear those speakers. With the headphones on you would not be able to hear the TV's external speakers anyway, so that is why the manufacturers program the headphone jack to work that way.
About the only way to defeat this behaviour would be to get a hold of the TV's schematics, figure out how LG has programmed the behaviour into the TV's circuitry, and then come up with a way to defeat it. Needless to say this would be an expensive proposition, especially if you would have to pay someone else to figure out how to defeat the behaviour.
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