When you guys come across an LG french door refrigerator or something similar such as Kenmore or GE and have an excessive ice issue, remember to raise the evaporator up to expose the return air vent from the refrigerator. A lot of times, you will get a call for the refrigerator not cooling but the freezer is doing alright. To quickly test this, open one of the refrigerator doors, hold down the light switch button at the top of the hinge and check for cool air coming out of the vent. Allow 15 seconds for the damper door to open. If none, open the freezer door and repeat the test with the refrigerator. If you do get cold air coming through the vent when the freezer door is open but none when the freezer door is closed, you have a plugged return air vent inside the freezer. You will need to use a steam machine to clean this out.
In this situation, there was no defrost problem. This was an air circulation issue. The refrigerator temp thermistor would keep telling the computer that the refrigerator temperature was too warm and would keep the compressor running all the time without going into defrost. So it would just keep circulating air in the freezer for 1 week till I got to it. Once the ice was cleared up, everything worked fine.
I attached some pics for all to see what I'm talking about. Hope this helps make your job a lot easier.