LG ATNH126ELFB Service Manual page 101

6. When Vertical Louver does not operate
• Confirm that the Vertical Louver is normally geared with the shaft of
Stepping Motor.
• If the regular torque is detected when rotating the Vertical Louver with
hands
• Check the connecting condition of CN-U/D Connector
• Check the soldering condition(on PWB) of CN-U/D Connector
• Confirm that there is DC + 12V between pin
GND.
• Confirm the assembly conditions that are catching and interfering parts
in the rotation radial of the Vertical Louver
Normal
Check the operating circuit of the Vertical Louver
If there are no problems after above checks
Electronic Parts Troubleshooting Guide
(RED) of CN-U/D and
Service Manual 105