LG Electronics LA120CPO, LA120HPO, LA090HPO, LA120HPI When Vertical Louver does not operate

Troubleshooting Guide

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 Normal

•Check the connecting condition of CN-UP/DOWN Connector

•Check the soldering condition(on PWB) of CN-UP/DOWN Connector

Check the operating circuit of the Vertical Louver

•Confirm that there is DC +12V between pin(RED) of CN-UP/DOWN and GND.

•Confirm that there is a soldering short at following terminals.

- Between 77 , 78	, 79 and 80	of MICOM
- Between 4 , 5 , 6 and 7		of IC02M
- Between 10 , 11	, 12 and 13 of IC01M
- Between 1 , 2	, 3 , 4 and 5 of CN-UP/DOWN

If there are no problems after above checks

•Confirm the assembly conditions that are catching and interfering parts in the rotation radial of the Vertical Louver

Service Manual 67