LG F12695RDH Service Manual ▷ View online
46
Test point
and
Result
(Hall
Sensor)
(Hall
Sensor)
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.
It also can read that the load is off balance when the drum speed fluctuates.
- 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.
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.
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.
board in next section.
(1) (3) (5)
(2) (4)
47
Test Point
and
Result
(Hall
(Hall
Sensor)
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
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 White & Gray 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.
measured the control board is defective.
8. Place meters leads on Blue to Gray. Turn motor rotor slowly by hand. You
should measure a pulsing 10 Vdc. Place meter leads on Red to Gray. 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 red
& blue wires for continuity. Repair or replace harness as needed.
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 red
& blue wires for continuity. Repair or replace harness as needed.
- Voltage Testing Hall Sensor from the Main PCB Assembly
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.
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.
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.
likely defective. Disconnect power by unplugging washer and ohm check hall
sensor to verify failure of the hall sensor.
Test Points
(1) to (2)
(1) to (3)
(1) to (4)
(2) to (4)
(3) to (4)
Result
8-12 kΩ
8-12 kΩ
10-15 Vdc
10 Vdc
10 Vdc
Remarks
Voltage Input
Pulsing Signal
Pulsing Signal
(2)
(1)
(4)
(3)
48
9-4. PUMP MOTOR ASSEMBLY
!
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!
!
!
!
!
!
!
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)
*
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+
* All load circuits in wiring diagram areall thesame.
Two pump motors are used to drain the tub and to circulate the water / detergent solution.
"
"
Test Points
Result
(1) to (2)
10-20 9
,
-.
-.
-.
-.
)*
49
9-5. INLET VALVE ASSEMBLY
Depending on the cycle and water temperature, the controller will energize the hot or cold
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 k9
!
* All load circuits in wiring diagramare all the same.
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