LG LMX25981 Series - TROUBLESHOOTING; BEFORE CALLING FOR SERVICE

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3. Open Door Detection Circuit Check
8-2-3 Temperature Sensor Circuit
Measurement
Location
Freezer/
Refrigerator Door
Closed
Open
Pin 11 & 12 of con4 Ref.Door
Pin 5 & 6 of con6 Fre.Door
5V
0V
The upper circuit reads refrigerator temperature, freezer temperature, Icing sensor 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
Room Temperature sensor
Icing sensor
CHECK POINT
POINT Ⓐ Voltage
POINT Ⓑ Voltage
POINT Ⓒ Voltage
POINT Ⓓ Voltage
POINT Ⓔ Voltage
NORMAL (-30°C ~ 50°C)
0.5V ~ 4.5V
SHORT-CIRCUITED
0V
OPEN
5V