LG WM2020CW Service Manual ▷ View online
40
9-5. INLET VALVE ASSEMBLY
Wiring
diagram
diagram
Circuit in the MAIN PWB
INLET
VALVE
VALVE
Vac
Rs
Vdc
Cg
Rg
IC
MICOM
Cs
PCB
CONNECTOR
Inlet valve driving circuit
Function
Test
points
points
and
Result
Depending on the cycle and water temperature, the controller will energize the hot or cold
water valve solenoids to meet the selected water temperature.
water valve solenoids to meet the selected water temperature.
After pull out the connector of defective valve, check the resistance.
Test points
(1)-(2)
Result
0.8-1.2 k
Ω
Wiring Diagram
MAIN
WASH
PRE
WASH
BLEACH
HOT
VALVE
1
2
1
2
1
2
1
2 RD
BL
BL
NA
WH
NA4
GY YL
BL
BL4
BL3
4
3
2
1
1
2
3
1
2
3
4
3
2
1
4
3
2
1
4
3
2
1
COMMON
(BK)
(BK)
MIAN PWB
INLET VALVE
* Each circuits of loads in wiring diagram are all same.
(1) (2)
(1) (2)
(1) (2)
(1) (2)
41
9-6. HEATER ASSEMBLY
Wiring
diagram
diagram
Circuit in the MAIN PWB
MICOM
12V
X100
Heater
Vac
43
43
Tab Relay
Heater driving circuit
Wiring diagram
MAIN PWB
1 2
1 2
1 2
1 2
BK
YL
BN
RD
BK
(X71)
(X134)
WASH
HEATER
HEATER
YL
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
* Each circuits of loads in wiring diagram are all same.
Wash Heater
Test Points
Result
(1) to (2)
12-18
Ω
(1)
(2)
42
9-7. THERMISTOR ASSEMBLY
Wiring
diagram
diagram
Circuit in the MAIN PWB / Wiring Diagram
MAIN PWB
MICOM
NA3
BL
WH
1
2
WASH
THERMISTOR
3
4
5
6
1
5V
5V
R
R
R
R
C
C
C
C
2
3
4
5
6
Function
Test
points
& Result
points
& Result
The thermistor (temperature sensor) is used to monitor water temperature in the tub
or Steam Generator.
or Steam Generator.
Wash Thermistor
(1)
(2)
Test
Points
(1)
to
(2)
Result
(tolerance ±5%)
39.5 kΩ
26.1 kΩ
12.1 kΩ
8.5 kΩ
3.8 kΩ
2.8 kΩ
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)
10. DISASSEMBLY INSTRUCTIONS
43
CONTROL PANEL ASSEMBLY
1
Unscrew 2 screws on the back of the top plate.
Be sure to unplug the machine before disassembling and repairing the parts.
2
Pull the top plate backward and upward as shown.
4
Pull out the drawer and unscrew 2 screws.
5
Remove one screw.
8
Disassemble the Display PWB Assembly.
6
Lift the side the control panel assembly and
pull it out
7
Unscrew the 8 screws from the control panel
assembly.
3
Disconnect the Display PWB assembly connector
from trans cable.
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