LG ARUN Series Service Manual page 121

Error No. Error Type
78*
Fan Motor Hall Sensor
Master 781
Error
Slave 782
I Error Diagnosis and Countermeasure Flow Chart
Is fan motor assemble
condition normal?
Yes
Is wiring between fan motor
and PCB normal?
Yes
Is connector color between
Hall Sensor PCB matched?
Yes
Is fan PCB assembly normal?
Yes
Recheck power and
installation condition
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Only for training and service purposes
Error Point
Fan Motor Hall Sensor short/open
No
Check ODU fan motor assemble condition and locking
¡ Reassemble or replace if abnormality found
No
Recheck f an motor hall sensor connection
¡ Reassemble if abnormality found
No
Check if connector color matched between fan motor hall sensor and PCB
¡ Reassemble if abnormality found
No
Replace Fan PCB assembly
Fan motor wire connection
Hall sensor connection
❈ Note : If LED is blinking oppositely after connecting Hall Sensor connector,
U.V.W output terminal oppositely, replace the motor.
If LED is not blinking oppositely,replace fan PCB assembly.
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Troubleshooting Guide
Main Reasons
1.Fan motor hall sensor defect
2.ODU fan motor hall sensor discon-
nection
3.ODU Fan Motor Hall Sensor wrong
insertion
4.Fan PCB assembly defect
LGE Internal Use Only