LG WM0742HGA Training Manual

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TRAINING MANUAL

HALL SENSOR TEST, DIAGNOSIS, and REPAIR

Check the wiring diagram for your machine. The wiring diagrams on some washing

machines were incorrect in depicting the hall sensor wiring. The error involves wiring

terminal designation. See the diagrams below.

The correct wiring terminal colors are:

White is (+)

Red is Hb

The correct depiction is shown left and the incorrect depiction is shown right.

Correct

Pay particular attention to the color codes and the position numbers in the connectors.

This will be critical when you take voltage readings to determine component malfunction.

WM0742HGA

Gray is (-)

Blue is Ha.

Incorrect

Page 1

WM0742HGA

TRAINING MANUAL

Page 1 TRAINING MANUAL WM0742HGA HALL SENSOR TEST, DIAGNOSIS, and REPAIR Check the wiring diagram for your machine. The wiring diagrams on some washing machines were incorrect in depicting the hall sensor wiring. The error involves wiring terminal designation. See the diagrams below.
Page 2 TRAINING MANUAL WM0742HGA Hall Sensor testing methods are now available on the following pages when LE error code hall sensor is out of order or defective. troubleshooting says “ ” Test FIRST!! 1 – BL (Ha) 2 – RD (Hb) 3 –...
Page 3 TRAINING MANUAL WM0742HGA Terminal Designation / Ohm & Voltage Specifications Hall Sensor Testing The hall sensor can be tested from the control board or at the hall sensor. Ohm Testing the Hall Sensor If tested off the stator using the diagram on the previous page, ohm check the resistors from pin 5 to pin 1 and pin 2.
Page 4 TRAINING MANUAL WM0742HGA Testing the Hall Sensor from the Control Board Control Board Testing Location 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.
Page 5 TRAINING MANUAL WM0742HGA Actual Terminal Wiring The potting epoxy has been removed to show the PC board and components. Voltage Testing Hall Sensor at Control Board (See page 50.) 1. Unplug the power cord. 2. Remove the rear control panel cover.