LG LRFD25850SB Service Manual page 28

8-2-2 Load / Buzzer Drive & Open Door Detection Circuit
1. Load Drive Condition Check
To measure outputs of the control board, check voltages between the pins for the following components:
Circuit
Compressor
Condenser fan
Defrost heater
F,R-lamp
Water valve
Dew heater
Water valve
NOTE: When the door of the freezer/refrigerator is left open for 7 minutes or longer, the lamp of the
freezer'refrigerator turns.
2. Fan motor driving circuit (freezing compartment fan)
MOTOR OFF
MOTOR ON
Pin Number
Con2 pin11
Con2 pin11
Con2 pin9
Con2 pin,3.5
Con2 pin7
Con2 pin3
Con2 pin1
Pin1 & 2 of con4
2V or less
13V~15V
Pin Number
Con1 pin1
Con1 pin1
Con1 pin1
Con1 pin1
Con1 pin1
Con1 pin1
Con1 pin1
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Output Voltage
115 VAC
115 VAC
115 VAC
115 VAC
115 VAC
115 VAC
115 VAC