LG WM3070HVA Service Manual ▷ View online
46
9-6. HEATER ASSEMBLY
Wiring
diagram
diagram
Circuit in the MAIN PWB
MICOM
12V
Heater
Vac
X100
43
43
Tab Relay
Heater driving circuit
Wiring diagram
MAIN PWB
(X71)
3 4
3 4
3 4
3 4
3 4
3 4
(X135)
(X134)
BK
BL
YL
RD
GY
BL
BK
BK
Vac
WASH
HEATER
HEATER
STEAM
GENERATOR
HEATER
GENERATOR
HEATER
YL
FUSE
FUSE
Function
Test points
Result
1. The wash heater is designed to raise the wash water to the desired temperature
selection during certain wash cycles.
2. The steam generator heater is designed to make the water to the steam during
steam cycles.
Wash Heater
Steam Generator Heater
* Each circuits of loads in wiring diagram are all same.
Wash Heater
Steam Generator Heater
Test Points
Result
(1) to (2)
12-18
Ω
Test Points
Result
(1) to (2)
12-18
Ω
(1)
(2)
(2)
(1)
47
9-7. THERMISTOR ASSEMBLY
Wiring
diagram
Circuit in the MAIN PWB / Wiring Diagram
MAIN PWB
MICOM
NA3
BL
BN
WH
1
2
1 2
1 2
1 2
WH
WASH
THERMISTOR
STEAM
GENERATOR
THERMISTOR
1 2
3
4
5
6
4
5
6
1
5V
5V
R
R
R
R
C
C
C
C
2
3
4
5
6
3
4
5
6
Function
Test
points
The thermistor (temperature sensor) is used to monitor water temperature in the tub
or steam generator.
or steam generator.
Wash Thermistor
(2)
(1)
48
Result
Wash Thermistor
Test Points
(1) to (2)
Result
(tolerance ±5%)
39.5 k
Ω
26.1 k
Ω
12.1 k
Ω
8.5 k
Ω
3.8 k
Ω
2.8 k
Ω
Remarks
At 86°F (30°C)
At 104°F (40°C)
At 140°F (60°C)
At 158°F (70°C)
At 203°F (95°C)
At 221°F (105°C)
Steam generator Thermistor
Test Points
(1) to (2)
Result
(tolerance ±5%)
39.5 k
Ω
26.1 k
Ω
12.1 k
Ω
8.5 k
Ω
3.8 k
Ω
2.8 k
Ω
2.1 k
Ω
1.4 k
Ω
1.0 k
Ω
0.7 k
Ω
0.4 k
Ω
Remarks
At 86°F (30°C)
At 104°F (40°C)
At 140°F (60°C)
At 158°F (70°C)
At 203°F (95°C)
At 221°F (105°C)
At 241°F (116°C)
At 266°F (130°C)
At 293°F (145°C)
At 320°F (160°C)
At 356°F (180°C)
49
9-9. LAMP
Wiring
diagram
diagram
Circuit in the MAIN PWB / Wiring Diagram
16.5V
R
RD3
BL
GY
RD
1 2 3
1 2 3
1 2 3
12
3
12
3
RD BK
LAMP
TR
R
MICOM
MAIN PWB
R
Function
Test
points
points
Result
The Lamp (Drum Light) comes on when the POWER button is pressed. It goes off
when the door is closed and the washer starts operation. It remains off when the
door is locked. It can be turned on while the washer is in operation by pressing the
RINSE+SPIN button for 3 seconds.
The lamp will turn off automatically 4 minutes later. It comes on when the washing
cycle is finished and goes off 4 minutes later.
when the door is closed and the washer starts operation. It remains off when the
door is locked. It can be turned on while the washer is in operation by pressing the
RINSE+SPIN button for 3 seconds.
The lamp will turn off automatically 4 minutes later. It comes on when the washing
cycle is finished and goes off 4 minutes later.
Original
Test Points
(3) to (1)
Result
16.5 Vdc
Remarks
Voltage Input
LAMP
(1) (3)
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