LG GM-B208SS Service Manual page 28

2. Fan motor driving circuit (freezing compartment fan)
1. The circuit makes the Motor Fan OFF by cutting Off the power supplied to driver inside the Fan Motor when it is necessary.
2. This is a circuit to perform a temporary change of speed for the fan motor and applies DC voltage up to 7.5V ~ 16V to motor.
3.This circuit prevents over-driving the fan motor by cutting off power applied to the fan motor in the lock of fan motor by sensing
the operation RPM of the fan motor.
MOTOR OFF
MOTOR ON
A part
2V or less
13V ~ 15V
- 28 -
C part
B part
0V
2V ~ 3V
0V
5V