LG 86BH7C Owner's Manual page 30

Make sure to read the Safety Precautions before using
the product.
The model and serial numbers of the SET are located on
the back and one side of the SET. Record it below should
you ever need service.
MODEL
SERIAL
WARNING -This is a class A product. In a domestic
environment this product may cause radio interference
in which case the user may be required to take adequate
measures.
Temporary noise is normal when powering ON or OFF this
device.