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Happens to me too. The drain freezes, freezer floor freezes and then ice starts building up to the point where it forms in the fan area and then the blades hit the fan and it gets very noisy. In my case, the container that is supposed to carry the defrosted water to the drain has a electric wire running underneath and twisting around the drain hole. I believe this wire is supposed to heat up and melt the ice to stop the drain hole from freezing. I believe the heating mechanism has failed in my case and suspect the same for you. Until fixed, this will continue to freeze up every so often. Search for your LG freezer drain heating element or parts.
When you see that ice forms on the bottom of your freezer it is most likely means that the drain hose of the fridge is blocked. You will need to take the panel inside the freezer off, clear all the ice and pour hot water into the drain hole until you hear the water coming out at the beck where the compressor is located. The next step would be running a 1/4" hose thru that hole. Good luck. www.QuickFixAppliances.ca
Need to completely defrost freezer. hot rags, hot water, paper towels, etc. Until you get all the ice out you don't have a chance of unclogging the drain. Could be just ice clogging it too which in that case hot water will solve that as well. If it's something else clogging the drain, I've used a mini bottle brush to unclog them or even a stiff piece of solid wire.
Ice build up wil accor if the evaporater blower goes out and does not crculate the air. If you have the model number off the tag I can be of more assistance, with the mobel number I can break the unit componants down in a diagram
What I would do is find the drain hole inside the evaporator and unclog it. The water from defrost operation is not draining properly. To keep ice from forming in the hole a neat trick is to attach a wire from the heater down into the entrnace of the hole to prevent the ice from forming. Basic Ice Box 101
That water should be draining out the hole in the evaporation compartment. The defrost drain is stopped up. Remove the service panel and get the junk out the hole and the water from defrost will drain out instead of in the bottom.
If ice is forming in the hole a neat trick to know is to run a wire from the defrost heater down in the hole a hair to keep ice from forming over the drain hole.
There is a drain port in the behind the freezer panel where all of the water drains when your evaporator coils defrost. It has gotten clogged with food, or ice. Thaw all of the ice and unplug the drain hole, and ice will stop forming on the bottom of your freezer.