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Hello, I'm Aric and I will be assisting you. Please don't mind the auto-generated messenger above - it's simply a computer.
I will find and post where you can buy the replacement AC adapter for your LG below:
There is also one for less money at the following link. To answer your other question, the specs MUST match as it is a 19 VDC switch model universal power supply with center tip positive. Below is also a more cost effective unit ($12 and change with free ship) that will also work:
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