LG WD-12470TD / WD-14475TD Service Manual ▷ View online
41
9-4. PUMP MOTOR ASSEMBLY
Wiring
diagram
diagram
Circuit in the MAIN PWB
Wiring Diagram
MICOM
IC
R
5V
Rg
Cg
Vdc
Rs
Cs
PCB
CONNECTOR
PUMP
Vac
2
1
4
3
Pump Driving circuit
MAIN PWB
BL4
1 2 3
1
2
3
3 2 1
3 2 1
3 2 1
1
2
3
4
1 2 3 4
BL3
SB
BK
BN
DRAIN
PUMP
PUMP
Object
Function
Test
points
points
Result
* Each circuits of loads in wiring diagram are all same.
Two pump motors are used to drain the tub and to circulate the water / detergent solution.
Drain Pump
Drain Pump
Test Points
Result
(1) to (2)
10-20 Ω
T.P
For Drain
(1)(2)
(1)
(2)
42
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 kΩ
Wiring Diagram
MAIN
WASH
PRE
WASH
BLEACH
HOT
VALVE
1
2
1
2
1
2
1
2 RD
BL
BL
NA
WH
NA4
GY VT
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)
43
9-6. THERMISTOR ASSEMBLY
Wiring
diagram
diagram
Circuit in the MAIN PWB / Wiring Diagram
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
Test
Points
(1)
to
(2)
Result
(tolerance –5%)
39.5 kΩ
26.1 kΩ
12.1 kΩ
26.1 kΩ
12.1 kΩ
8.5 kΩ
3.8 kΩ
2.8 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)
(1) (2)
44
9. DISASSEMBLY INSTRUCTIONS
Disassemble and repair the parts after pulling out power cord from the outlet.
1 Unscrew the screws on the top plate.
3 The cover(Inner) is disassembled.
2 The plate assembly(Top) is pulled back and
then upward to arrow direction.
1 Pull out the drawer and unscrew 2 screws.
2 Lift the side the Control Panel Assembly and
pull it out
1 Two screws is unscrewed.
2 Push out PANEL ASSEMBLY, CONTROL after
Push the hook below.
1 The PWB assembly(Display) is disconnected.
2 When 7 screws are unscrewed on the PWB
insulator and the PWB assembly(Display) is
disassembled from the PWB insulator.
disassembled from the PWB insulator.
CONTROL PANEL
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