LG LWHD1000R Service Manual - Page 26

Electrical Parts Troubleshooting Guide

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

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26
Room Air Conditioner
Troubleshooting Guide
Is the
Trans input power AC 115V?
Is the Trans output power
about AC 14V?
Is shorted the Trans. output?
Is output Voltage of IC01D
DC 12V?
Is output Voltage of IC02D
DC 5V?
Is the voltage No.18 of Micom
DC 5V?
Replace AC PCB Ass'y.
Is the
connection between
AC and DC
OK?
Is the reset circuit good?
(The No.14 of
Micom is 5V.)
• Check the Fuse.
• 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.
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
YES
Possible Trouble 1
The unit does not operate.
Electrical Parts Troubleshooting Guide