LG LSC27931SB Service Manual

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1-9. Fan motor driving circuit (freezer, mechanical area)
1. The circuit cuts all power to the fan drive IC, resulting in a standby mode.
2. This circuit changes the speed of the fan motor by varying the DC voltage between 7.5 Vdc and 16 Vdc.
3. This circuit stops the fan motor by cutting off power to the fan when it senses a lock-up condition.
4. The ground is connector 7, pin 2.
Between a c , d c Between b c Between e c
Motor OFF 5V 2V or less 2V or less
Motor ON 2~3V 12~14V 8~16V
C-FAN
R50
P54
1
D15
1mH
1.5K
R49
C-FAN LOCK
10
4.7K
FR107
CC18*
Q6
4
Q9
1/2W
3
R44*
8
2K
FR107
F-FAN
KTB1151
53
R39
R47*
/25V
330
R48*
D14
F-FAN LOCK
4
R41*
L4
D16
R43
4.7K
CE11
FR107
D17
KTC3198
Q7
10K
3.9K
2
CC20*
50
330
1mH
R42
FR107
52
R46
10K
3.9K
220uF
4.7K
102
CC19*
CC17*
2K
R38
1
KTC3198
R51*
223
KTB1151
102
/25V
R40*
12
R45
CE10
9
L3
P51
1/2W
3
7
F-FAN PWM
P50
49
C-FAN PWM
223
11
220uF
2
P53
4.7K
Q8
1.5K
b
a
d
c
c
d
b
a
e
c

LG LSC27931SB Specifications

General

Brand	LG
Model	LSC27931SB
Category	Refrigerator
Language	English