LG WF-D1019DD / WF-D1119DD / WF-D1219DD Service Manual ▷ View online
52
- Voltage Testing Hall Sensor at Stator
If measuring voltage from the Main PCB Assembly to the Hall Sensor, use the following steps:
1. Unplug power cord.
2. Remove rear washer panel.
3. Locate Hall sensor connector on the stator behind the rotor.
4. Place meter leads on terminals 5 to 4, white to gray.
5. Plug in power cord, close door, and press power button.
1. Unplug power cord.
2. Remove rear washer panel.
3. Locate Hall sensor connector on the stator behind the rotor.
4. Place meter leads on terminals 5 to 4, white to gray.
5. Plug in power cord, close door, and press power button.
DO NOT PRESS START!
6. You should measure 10 to 15 Vdc. If 10 to 15 Vdc is present, control board,
white wire, and gray wire are OK! If not follow testing output voltages on control board
in next section.
in next section.
(2)
(3)
(4)
(5)
(1)
The hall sensor determines the speed and direction of the motor.
It also can read that the load is off balance when the drum speed fluctuates.
Test
point
and
Result
(Hall
Sensor)
4-9-3. HALL SENSOR
53
4-9-3. HALL SENSOR
(3)
)
4
(
)
2
(
)
1
(
- Voltage Testing Hall Sensor from the Main PCB Assembly
1. Unplug power cord.
2. Remove rear panel.
3. Remove Washer Top.
4. Remove Main PCB Assembly cover as shown in Figure below.
5. Locate the white Hall Sensor 4 wire connector using wiring diagram wire colors as your guide.
6. Plug in power cord, close door, and press power button. DO NOT PRESS START!
7. Place meter leads on Brown & Yellow wires. You should read 10 to 15 Vdc output from the Main
2. Remove rear panel.
3. Remove Washer Top.
4. Remove Main PCB Assembly cover as shown in Figure below.
5. Locate the white Hall Sensor 4 wire connector using wiring diagram wire colors as your guide.
6. Plug in power cord, close door, and press power button. DO NOT PRESS START!
7. Place meter leads on Brown & Yellow wires. You should read 10 to 15 Vdc output from the Main
PCB Assembly to the Hall sensor. If no 10 to 15 Vdc is measured the control board is defective.
7. To measure output signal voltage from the hall sensor, carefully move test leads to terminals 1
to 4, blue and gray. Slowly rotate motor rotor by hand. You should read a pulsing 10 Vdc. If 10
Vdc is measured from 1 to 4, move lead on blue wire to red wire, terminal 2. Repeat rotating
motor rotor by hand. You should read a pulsing 10 Vdc from red to gray.
motor rotor by hand. You should read a pulsing 10 Vdc from red to gray.
8. If pulsing 10 Vdc is measured from 1 to 4 and 2 to 4, hall sensor is OK! If either test netted
only 9 to 10 Vdc without changing (no pulsing) the hall sensor is likely defective. Disconnect
power by unplugging washer and ohm check hall sensor to verify failure of the hall sensor.
power by unplugging washer and ohm check hall sensor to verify failure of the hall sensor.
8. Place meters leads on Blue to yellow. Turn motor rotor slowly by hand. You should measure a
pulsing 10 Vdc. Place meter leads on Red to Yellow. Turn motor rotor slowly by hand. You
should measure a pulsing 10 Vdc. If both tests measure a pulsing 10 Vdc, hall sensor and
harness OK. If either or both tests measures 9 to 10 volts, but does not pulse or change, Hall
sensor has failed and must be replaced. IF zero (0) voltage is measured on either test, check
r ed & b l ue wi r es f or c o nt i nu it y. Re pa i r or r eplace harness a s needed.
should measure a pulsing 10 Vdc. If both tests measure a pulsing 10 Vdc, hall sensor and
harness OK. If either or both tests measures 9 to 10 volts, but does not pulse or change, Hall
sensor has failed and must be replaced. IF zero (0) voltage is measured on either test, check
r ed & b l ue wi r es f or c o nt i nu it y. Re pa i r or r eplace harness a s needed.
Pulsing Signal
Pulsing Signal
Pulsing Signal
Voltage Input
Remarks
Result
Test Points
Pulsing Signal
Pulsing Signal
Pulsing Signal
Voltage Input
Remarks
Result
Test Points
Test
Point
and
Result
(Hall
Sensor)
)
8
(
)
6
(
)
5
(
)
7
(
54
4-9-4. PUMP MOTOR ASSEMBLY
Circuit in the MAIN PWB
R
1
2
3
4
5V
Cs
Cg
Vdc
PUMP
Rg
Vac
Rs
MICOM
10-20
(1) to (2)
Result
Test Points
10-20
(1) to (2)
Result
Test Points
(2)
(1)(2)
(1)
(1)
(2)
(1)
(2)
Used to drain the tub
Wiring Diagram
IC
PCB
CONNECTOR
Pump Driving circuit
Drain Pump
Drain Pump
* Each circuits of loads in wiring diagram are all same.
Wiring
diagram
Result
Test
points
Function
PUMP
55
4-9-5. INLET VALVE ASSEMBLY
0.8-1.2
Result
(1)-(2)
Test
points
0.8-1.2
Result
(1)-(2)
Test
points
Depending on the cycle and water temperature, the controller will energize the hot or cold water
valve solenoids to meet the selected water temperature.
Circuit in the MAIN PWB
Wiring diagram
Cs
Cg
Vdc
Rg
MICOM
Vac
Rs
PCB
CONNECTOR
INLET
VALVE
IC
After pull out the connector of defective valve, check the resistance.
* Each circuits of loads in wiring diagram are all same.
Inlet valve driving circuit
Wiring
diagram
Test
points
and
Result
Function
(1) (2)
(1) (2)
(1)
(2)
(1) (2)
INLET VALVE
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