LG WM0742HGA Installationsanleitung

TRAINING MANUAL WM0742HGA

WM0742HGA Page 1 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 (+) Gray is (-)

Red is Hb Blue is Ha.

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

Correct Incorrect

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.

TRAINING MANUAL WM0742HGA

WM0742HGA Page 2 TRAINING MANUAL

Magnetic Pickups &

Attaching Clips

1 2 3 4 5

OHM Checking Voltage Checking

5 to 1 = 10 K Ω

5 to 4 = 10 to 15 VDC Voltage Input

5 to 2 = 10 K Ω

4 to 1 = pulsing 10 VDC Signal Output

4 to 2 = pulsing 10 VDC Signal Output

Note: Ohm values are approximate; if the ohm check determines either resistor

open, the hall sensor has failed and must be replaced!!

1 – BL (Ha)

2 – RD (Hb)

3 – Not Used

4 – GRY (-)

5 – WH (+)

Hall Sensor testing methods are now available on the following pages when LE error code

troubleshooting says “

hall sensor is out of order or defective.

”

Test FIRST!!

TRAINING MANUAL WM0742HGA

WM0742HGA Page 3 TRAINING MANUAL

Terminal Designation / Ohm & Voltage Specifications

Part No. 6501KW2002A

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. If

the hall sensor is good, you should

measure approximately 10 KΩfrom pin 5

to pin 1 and 10 KΩfrom pin 5 to pin 2. If

either test shows an open (infinity) the hall

sensor is defective and must be replaced.

Voltage Testing Hall Sensor at Stator

If measuring voltage from the control board to the hall sensor, follow the

following steps:

1. Unplug the power cord.

2. Remove the rear washer panel.

3. Locate the Hall sensor connector on the stator behind the rotor.

4. Place the meter leads on terminals 5 to 4, white to gray.

5. Plug in the power cord, close the door, and press the power button.

DO NOT PRESS START!

6. You should measure 10 to 15 VDC. If 10 to 15 VDC is present, the control board

is OK!

If not, follow the testing output voltages on control board in next section.

7. To measure output signal voltage from the hall sensor, carefully move test leads

to terminals 4 (gray) to 1 (blue). Slowly rotate the motor rotor by hand. You

should read a pulsing 10 VDC. If 10VDC is measured from 4 to 1, move the lead on

the blue wire to the red wire, terminal 2. Repeat rotating motor rotor by hand.

You should read a pulsing 10 VDC.

8. If pulsing 10 VDC is measured from pin 4 to pin 1 and pin 4 to pin 2, the 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 the

washer. Ohm check the hall sensor as outlined in Ohm Testing The Hall Sensor

(see above) to verify failure of the hall sensor.

TRAINING MANUAL WM0742HGA

WM0742HGA Page 4 TRAINING MANUAL

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.

•White to Gray – 10 to 15 VDC

•Gray to Blue – pulsing 10 VDC

•Gray to Red – pulsing 10 VDC

Note: If 10 VDC from gray-to-blue or gray-to-red does not change (pulse), that resistor

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!

TRAINING MANUAL WM0742HGA

WM0742HGA Page 5 TRAINING MANUAL

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.

3. Remove the top plate.

4. Remove the main board from the rear cabinet corner.

5. Identify the hall sensor connector on the main board, as shown on page 68, using

the wiring diagram and wire colors as your guide. (See wiring diagram and main

board photo, page 68.)

6. Plug in the power cord, close the door, and press POWER.

DO NOT PRESS START!

7. Place your meter leads on the WHITE and GRAY wires. You should read between

10 ~15 VDC output from the main board to the hall sensor. If 10 ~15 VDC are

not observed, the main board is defective.

8. Place your meter leads on the BLUE and GRAY wires. Turn the motor rotor slowly

by hand. You should measure a pulsing 10 VDC. Place your meter leads on the

RED and GRAY wires. Turn the motor rotor slowly by hand. You should measure a

pulsing 10 VDC.

If both of these tests measure a pulsing 10 VDC, the hall sensor and wiring

harness are OK. If either or both tests measures 9 ~10 VDC but does not pulse

or change, the hall sensor has failed and must be replaced.

If either test measures 0 (zero) voltage, check the red and blue wires for

continuity. Repair or replace the wiring harness as necessary.

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