LG LBC20514TT Service Manual page 27

8-2-5 Temperature Sensor Circuit
The upper CIRCUIT reads REFRIGERATOR temperature, FREEZER Temperature, and DEFROST-SENSOR temperature
for defrosting and the indoor temperature for compensating for the surrounding temperature into MICOM.
OPENING or SHORT state of each TEMPERATURE SENSOR are as follows:
SENSOR
Freezer Sensor
Refrigerator Sensor
Defrosting Sensor
8-2-6 Refrigeration Compartment Stepping Motor Damper Circuit
* The circuit shown below is the damper circuit to regulate the refrigerator temperature.
1
2
3
CHECK POINT
POINT A Voltage
POINT Voltage
B
POINT Voltage
C
NORMAL (-30°C ~ 50°C)
0.5 V ~ 4.5 V
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FREEZER-SENSOR
REFRIGERATOR-SENSOR
DEFROST-SENSOR
SHORT-CIRCUITED OPEN
0 V 5 V