LG GR-R463JCA Service Manual page 26

7-2-5 TEMPERATURE SENSOR CIRCUIT
The upper CIRCUIT reads REFRIGERATOR temperature and DEF-SENSOR temperature for defrosting into MICOM.
OPENING or SHORT state of each TEMPERATURE SENSOR are as follows.
SENSOR
Refrigerator Sensor
Defrosting Sensor
7-2-6 DOOR OPEN DETECTING CIRCUITS
MEASURING POINTS
Freezer / Refrigerator Door
CLOSED
OPEN
CHECK POINT
A
POINT Voltage
POINT B Voltage
NORMAL(-30 °C ~ 50 °C)
0.5 V ~ 4.5 V
IC1 (Pin No. 8)
5 V
0 V
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SHORT-CIRCUITED OPEN
0 V 5 V