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Part 5. Trouble Shooting

- 58 -

Only for training and service purposes

LGE Internal Use Only

Indoor BLDC Fan Motor

Lock

The Fan is not operated

properly

Check the Indoor fan locking

Display

code

Title Cause of error Check point & Normal condition

Check Point

Check the PCB during the Power on

1. Check the Voltage Red line to Black line

’ The Voltage is about [input voltage x 1.414]

’ if the Voltage does not come with the above Voltage,

’ Check the power input

’ Replace the PCB & Motor

2. Check the Voltage Black line to White

’ the Voltage is DC 15V

’ Check the Power input

’ Replace the motor

Check the Motor

1. Check the shaft

’ if the shaft is not turn smoothly, the Motor Power IC is defected

’ replace the motor

2. Check the motor resistance(if the shaft is turn smoothly, check the resistance)

’ Check Red line to Black line, Blue line to Black line

’ The resistance should infinite

’ replace the motor

Tester

Fan motor

connector

Yellow

Blue

White

Black

Red

LG LMN078HVT User Manual

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