Check if terminal in PCB
area is pushed to final
position.
If not, reinsert it to final
position.

Set multimeter to
resistance gear.

In PCB area, measure the
resistance of defrost temp.
sensor with a multimeter.

Measure the temperature
of freezer air duct, near the
defrost temp. sensor.
Use measured temperature
to find the standard
resistance value in
Temperature-Resistance
Chart for Sensor.

Unscrew cover of
mainboard with a
Cross-head screwdriver.

Prize off the buckle to
remove mainboard.

Check if the terminal is
stuffed with foam.

Check if sensor is
attached in proper
position, as shown in
picture.
If not, correct it.

Check if wire of defrost
sensor is broken.
If yes, replace it with a
new one.

Disconnect terminal of
defrost temp. sensor.

Measure resistance of
defrost temp. sensor
from terminal in freezer,
and take note of it.

Measure the temperature
of defrost temp. sensor.
Use measured
temperature to find the
standard resistance
value in Temperature-
Resistance Chart for
Sensor.