Hate to revive an old thread, but as the new owner of an LGOG i just ran across this problem the other day. My phone has been able to go two day on a charge, and last week I forgot to charge it on night. Found it dead the next day. was leaving so I took it intending to charge at work or in the car. Car charger had no effect, but upper portion of phone got hot. plugged it in at home, same thing, charging icon, getting hot, but not charging. Also noted dim screen glow all the time.
tried 2o second hold on power button, vol up and down, got into the download screen and the bootloader screen, but no charge. Finally held the power button and vol. up and red charging light came on. Held it for a minute and the red charging light stayed on, let go out it went. Decided to try a couple of rubber bands around the phone to hold in the buttons, and it worked ---phone charged fully and operates as usual.
Thought I'd pass my experiance on to help anyone else with similar problem. Any idea why this worked?