LG WM2550HVCA 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
AG
VALVE
PRE
WASH
BLEACH
HOT
VALVE
1
2
1
2
1
2
1
2
1
2
RD
BL
BL
RD
NA
WH
NA4
VT
GY YL
BL
NA2
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)
(1)
(2)
(1)
(2)
(2)
(1)
(2)
(1)
(2)
(1)
(1)
(2)
(1)
(2)
(2)
(1)
(2)
(1)
(2)
41
9-6. HEATER ASSEMBLY
Wiring
diagram
diagram
Circuit in the MAIN PWB
MICOM
12V
Heater
Vac
X100
3
4
3
4
Tab Relay
Heater driving circuit
Wiring diagram
MAIN PWB
(X71)
3 4
3 4
3 4
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
E
S
U
F
E
S
U
F
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)
42
9-7. THERMISTOR ASSEMBLY
Wiring
diagram
diagram
Circuit in the MAIN PWB / Wiring Diagram
MAIN PWB
MICOM
NA3
BL
BN
WH
1
2
1 2
1 2
1 2
1 2
WH
WASH
THERMISTOR
STEAM
GENERATOR
THERMISTOR
1 2
3
4
5
6
1
5V
5V
R
R
R
R
C
C
C
C
2
3
4
5
6
Function
Test
points
points
The thermistor (temperature sensor) is used to monitor water temperature in the tub
or steam generator.
or steam generator.
Wash Thermistor
(2)
(1)
Steam Generator Thermistor
(1) (2)
(1) (2)
43
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)
Click on the first or last page to see other WM2550HVCA service manuals if exist.