Advice on annoying noise in refrigerator no frost LG

[carlmdv]

The only additional noises on frost free are when it's doing the defrost cycle, the other system noises will still be present as the refrigerant turns from gas to liquid to gas on non frost free but will also be more basic models.

The cyclical (no frost free) also turn on every 15 minutes? I understood that they only turn on when they need to recover cold, perhaps the compressor is quieter.
Thanks!