LG WM0742HGA Training Manual page 4

TRAINING MANUAL
Testing the Hall Sensor from the Control Board
Control Board Output and Hall Sensor Input can be measured with the connector
connected to the board and the machine operating. Also, these voltages can be
measured by parking the meter leads on the desired terminals and spinning the tub
briskly with the power cord disconnected.
• White to Gray – 10 to 15 V
• Gray to Blue – pulsing 10 V
• Gray to Red – pulsing 10 V
Note: If 10 V from gray-to-blue or gray-to-red does not change (pulse), that resistor
DC
is open! Confirm by disconnecting the power, disconnecting the hall sensor connector on
the main board, and ohm checking that individual circuit!
With power disconnected and the connector disconnected, the hall sensor can be tested
ohmmetrically from:
• White to Blue – 10 KΩ
• White to Red – 10 KΩ
Note: Ohm values are approximate; if either ohm check shows an open, the wire harness
is open or the hall sensor is defective. Test both separately to determine the exact
location of the failure!
WM0742HGA
Control Board Testing Location
DC
DC
DC
Page 4
WM0742HGA
TRAINING MANUAL