LG GB7143**AV Series Service Manual page 61

No Checking flow
6 Check the Fan motor.
Rotate fan using your hand.
It feel sticky, change the motor.
(Cause of ice or rust inside of motor)
7 Check the Fan motor voltage.
(1) (3) (2) <CON6>
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Result & SVC Action
Point Result
Motor Sticky
Point Result
(1) ~ (2) Below 12 V
(2) ~ (3) 0 or 5 V
SVC Action
Change the motor
SVC Action
Change the PCB
Change the motor