Have lg washing machine that will fill with water and then when next cycle clicks in it just makes a humming sound - nothing. i replaced hall sensor - no change. i called a technician out and he checked motor - said it was generating power and stated must be motor control board. i ordered new motor control board - part number 6871er1003c (to replace original 6871ec1087c - lg updated part apparantly). i installed - very easy 10 plugs. after install i got very excited and pluged machine in any nothing!. i am about to pull my hair out - any help would be appreciated.
Sorry to say it but i think you still have a faulty hall sensor.
Try another one and send the last one back as being faulty.
It means the motor gets the power but the hall sensor stops it dead in its track
HERE is your service manual
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SOURCE: Humming sound washer won't spin
It sounds like you have a hall sensor failure, if your machine fills with water and then does the buzz thing without the drum ever moving in the cycle.
The Hall sensor (part number 6501KW2001A) has failed. The hall sensor is rather easy to replace, and is covered by a seven year part warranty (in the US). Take the back cover off. Take the big nut off and remove the motor rotor. Remove the bolts holding the motor windings. Remove the electric plug on the sensor and unclip it from the motor winding. Snap new sensor on and reassemble. Usually takes under a half hour. On a difficulty scale of 1 - 10, it might rate a 4. This should be a Fix-Ya for your machine, and at basically no cost!
In the US, find a service provider using your zip code at http://us.lgservice.com/index_b2c.jsp or call LG at 800-243-0000
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