Table of Contents
Advertisement
Electronic Parts Troubleshooting Guide
1. Product does not operate at all.
(* Refer to Electronic Control Device drawing and Schematic diagram.)
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
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)
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Turn off Main Power
Turn on Main Power
Does "beeping" sound is made from the Indoor Unit?
NO
PCB Board Operation Check
- 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.
(After 10 seconds)
Primarily, the operating condition of Micom is OK.
Check each load(Indoor/Outdoor Fan Motor,
Compressor, Stepping Motor) and contacting
condition of related connector
Content
- 50 -
YES
Remedy
• Replace Trans
• Replace IC01D
• Replace IC02D
• Replace faulty parts
LGE Internal Use Only
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
