Read LG WM1873FDS Service Manual online
38
FOR AUTHORIZED SERVICE TECHNICIAN
Test Point
and
Result
and
Result
(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
as your guide.
6. Plug in power cord, close door, and press the button. DO NOT PRESS START!
7. Place meter leads on White & Gray wires. You should read 10 to 15 V
DC
output
from the Main PCB Assembly to the Hall sensor. If no 10 to 15 V
DC
is
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 V
DC
. Place meter leads on Red to Gray. Turn
motor rotor slowly by hand. You should measure a pulsing 10 V
DC
. If both tests
measure a pulsing 10 V
DC
, 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
Test Points
(1) to (2)
(1) to (3)
(1) to (4)
(2) to (4)
(3) to (4)
(1) to (3)
(1) to (4)
(2) to (4)
(3) to (4)
Result
8-12 k
8-12 k
8-12 k
10-15 V
DC
10 V
DC
10 V
DC
Remarks
Voltage Input
Pulsing Signal
Pulsing Signal
Pulsing Signal
(1) (3)
(2) (4)
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