Electrical Parts Troubleshooting Guide - LG LW8012ER Service Manual

Troubleshooting Guide

Electrical Parts Troubleshooting Guide

Possible Trouble 1
Is the
Trans input power AC 115V?
YES
Is the Trans output power
about AC 14V?
YES
Is output Voltage of IC01D
DC 12V?
YES
Is output Voltage of IC02D
DC 5V?
YES
Is the reset circuit good?
(The No.14 of
Micom is 5V.)
YES
Is the
connection between
AC and DC
OK?
YES
Is the voltage No.18 of Micom
DC 5V?
YES
Replace AC PCB Ass'y.
26 Room Air Conditioner
The unit does not operate.
NO
NO
Is shorted the Trans. output?
NO
NO
NO
NO
NO
NO
YES
• Check the Fuse.
• Check the Fuse.
• Check the wiring diagram.
• Check the wiring diagram.
• Check the Main
PCB pattern.
• Replace the Trans.
• Replace D02D~D05D.
• Replace IC01D.
• Replace IC02D.
• Replace IC01A, C02A.
• Connect connector
exactly.
• Check the PCB
pattern.