LG LFX23961ST Support Manuals Warranty More LG
I just used the link above to get the Manuals on your LG. On page 31, they did the following CYA statements...
The defrost timer will click when the automatic defrost cycle begins and ends. The thermostat control (or refrigerator control, depending on the model) will also click when cycling on and off.
Rattling noises may come from the flow of refrigerant, the water line, or items stored on top of the refrigerator .
Your refrigerator is designed to run more efficiently to keep your food items at the desired temperature. The high efficiency compressor may cause your new refrigerator to run longer than your old one, and
you may hear a pulsating or high-pitched sound.
You may hear the evaporator fan motor circulating the air through the refrigerator and freezer compartments.
As each cycle ends, you may hear a gurgling sound due to the refrigerant flowing in your refrigerator.
Contraction and expansion of the inside walls may cause a popping noise.
Water dripping on the defrost heater during a defrost cycle may cause a sizzling sound.
You may hear air being forced over the condenser by the condenser fan.
You may hear water running into the drain pan during the defrost cycle.
I bolded the statement. Sounds like you are going to have to get used to the sound.