Electronic Parts Troubleshooting Guide - LG TM-1830C2L Svc Manual

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, 60Hz)
• Main power's voltage
• Voltage applied to the unit
• Connecting method of Indoor/Outdoor connecting
cable
• Check Fuse (Outdoor PCB Ass'y)
• Check Varistor
ZNRØ1J(Outdoor PCB Ass'y)
Check the connection housing for contacting
• Connector related to CN-DC/AC
• 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)
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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 etc.) and contacting
condition of related connector
Content
- 44 -
YES
Remedy
• Replace Trans
• Replace IC01D
• Replace IC02D
• Replace faulty parts
LGE Internal Use Only