Remove the batt, place it on universal charger and boost it. For 1 hr. Reinsert it and power on. Good luck.
You haven't mentioned which model of LG phone.
You could try removing the back of the phone and taking out the battery.
Consult your owner manual on how to remove the battery.
Press and hold the power button for 10 seconds.
Leave the battery out for half an hour.
Replace the battery and plug in the charger.
Leave it for five minutes and then try to turn it on again.
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