I suppose it all comes down to LG and their customer support. I can only give my two pence worth with a similar experience I had with my Samsung TV. The capacitors blew and it wouldn't turn on it. The TV was was about 7 years old and after some research I found it was a common problem with the Rose red Samsung's of that age. I emailed Samsung basically saying that I was very disappointed that one of their TVs that wasn't cheap, should suffer such a fault and that I expected better from them and would not be buying another one of their TVs.
They emailed me back and within two days had a local engineer come out, pick up the TV and drop it off the next day, all at Samsungs expense.
I would try the same with LG. They don't want to lose custom.
Good luck!