On the LG 1100 HK, the earbuds are metal and threaded together. Because LG used thread lock compound on the threads, it was necessary to use two pliers to unthread the two halves. It didn’t take much force to twist them apart, though it could not be done without the tools. As a result, the two halves got slightly gouged/scratched which wasn’t too difficult to clean up with a fine jewelers file and a bit of 1000 grit sandpaper.
On my 1100, the connection at the bud was fine so next
step is checking the joints at the reel on the main body. If contacts are good then check wire with an ohm meter.
Hope this helps and good luck.