LG LS-F1260HL - Electronic Parts Troubleshooting

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Only for training and service purposes
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1. Product does not operate at all.
(* Refer to Electronic Control Device drawing and Schematic diagram.)
Electronic Parts Troubleshooting Guide
Turn off Main Power
Turn on Main Power
Does "beeping" sound is made from the Indoor Unit?
Primarily, the operating condition of Micom is OK.
Check the voltage of power(About AC 220V/AC240V, 50Hz)
• Main power's voltage
• Voltage applied to the unit
• Connecting method of Indoor/Outdoor connecting
cable
• Check PWB Ass'y
- Fuse
- Pattern damage
- Varistor(ZNR01J)
Check the connection housing for contacting
• Connector related to CN-POWER
• Connector related to CN-MOTOR
• Connector contacting of Outdoor Fan/Compressor
• Display PWB Ass'y Check
Check each load(Indoor/Outdoor Fan Motor,
Compressor, Stepping Motor) and contacting
condition of related connector
PCB Board Operation Check
Items
• Power Transformer
(Outdoor unit)
- Input Voltage
- Output Voltage
• IC01D(7812) Output
(Indoor/Outdoor unit)
• IC02D(7805) Output
(Indoor/Outdoor unit)
• IC01A(KIA7036, Reset IC)
X01(8MHz)
• Replace Trans
• Replace IC01D
• Replace IC02D
• Replace faulty parts
- About AC220V/240V
±
10% - Check the power voltage
- About AC14
±
3V
• DC
+
12V
• DC
+
5V
• Voltage of Micom No. 2,
(DC +4.5V over) and Soldering condition.
Content Remedy
NO
YES
(After 10 seconds)