LG LSC27990TT Service Manual page 27

EXPLANATION FOR MICOM CIRCUIT
1-7. Temperature sensing circuit
(1) GR-G277STSA(LSC27990TT)
The circuits involving the freezer and refrigerator sensors control the temperature in both the freezer and the refrigerator.
The icemaker sensor detects when ice is made. The defrost sensor determines both the need for defrosting and the
efficiency of the defrost operation. See the table below for voltages and checkpoints.
SENSOR
Freezing sensor
Defrost sensor
Refrigerator sensor 1
Refrigerator sensor 2
Magic room/ Opti Fresh Sensor
CHECK POINT NORMAL(-22 °F ~ 122 °F)
POINT A Voltage
POINT B Voltage
POINT C Voltage
POINT D Voltage
POINT E Voltage
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IN SHORT
0.5 V~4.5 V
IN OPEN
0 V 5 V