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The battery is probably dead. Every battery has something known as recharge-cycle limit(number of times it can charge and discharge). Replacing the battery will most likely resolve this issue as the screen turning on when connected to an external power supply indicates that there is nothing wrong with the charging port.
The problem could be one of two things - the phone, or your charger.
Most likely the problem is with the phone, since it's pretty rare for a charger to cause problems this severe. I would recommend taking it into your carrier's local store and trying to get it replaced.
take it back to where you got it and use the warranty. Lg is good at fixing any problem with their phones. But... be ready for a bit of a wait, speaking from experiance... I was with out my phone for about 7 weeks as it went from Sydney to Perth to be fixed. Have had no problem since. It should be still under warranty so use it thats what its for....