LG T8526AFPT Service Manual page 54

4-9-3. HALL SENSOR
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
m otor rotor b y hand . You s ho u ld
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.
- Voltage Testing Hall Sensor from the Main PCB Assembly
Test
Point
1. Unplug power cord.
2. Remove rear panel.
and
3. Remove Washer Top.
4. Remove Main PCB Assembly cover as shown in Figure below.
Result
5. Locate the white Hall Sensor 4 wire connector using wiring diagram wire colors as your guide.
(Hall
6. Plug in power cord, close door, and press power button. DO NOT PRESS START!
Sensor)
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.
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 e d & b l u e w i r e s f o r c o n t i n u i t y . R e p a i r o r r e p l a c e h a r n e s s a s n e e d e d .
( ) 8 ( ) 7 ( ) 6 ( ) 5
Test Points Test Points
53
re ad a puls i ng 10 Vdc from r ed to gray.
( ) 4 (3)
Result Result Remarks Remarks
Voltage Input Voltage Input
Pulsing Signal Pulsing Signal
Pulsing Signal Pulsing Signal
( ) 2 ( ) 1