Disconnect the LG washing machine from power, and pull the washer away from the wall.
Turn off the water supply, and disconnect the water hoses. Set the hoses down in buckets to catch any water. Clean the inlet screens in the hoses and the washer to remove debris.
Remove the screws along the edges of the rear of the washer, and remove the back panel.
Identify the water fill valve on the upper right side of the washer interior. The valve is often blue and gray in color.
Examine the valve for obvious signs of cracking, wear, or other damage. Contact LG for a replacement valve if needed, and do not use the washing machine until the valve is replaced.
Label each of the two wires connected to two solenoids (one hot, one cold) on the valve. The solenoids look like coils. Disconnect the wires by pulling the connectors out of the wire terminals. Look at the terminals and connectors for corrosion. Replacement is necessary if corrosion is found.
Use the leads on an ohm meter to touch one probe to each side of the solenoid terminal. If the valve shows no resistance, the valve needs to be replaced. Repeat on the other solenoid.
Clean the valve of debris and residue, as the valve cannot close if it is blocked by debris. If there is continuity with the ohm meter, and the wiring, terminals and connectors are all functional, the fill valve now may be in working order.