Electronic Parts Troubleshooting Guide - LG A3UH363FA0, A3UC363FA0, AMNH093D4A0, AMNC093D4A0, AMNH123DEA0, AMNC123DEA0, AMNH093APM0, AMNC093APM0, AMNH123APM0, AMNC123APM0 Service Manual

Electronic Parts Troubleshooting Guide

Refer to electronic contorol device drawing & schematic diagram.
The Product doesn't operate at all.
Trouble 1
Turn off the main power and wait until LED on outdoor PCB is off.
Check the voltage of power(AC208V/AC230V, 60Hz).
• The voltage of main power.
• The voltage applied to the unit.
• The connecting method of Indoor/Outdoor connecting cable (each color)
• The P.W.B. Ass'y
(Fuse, Noise Filter, Power Transformer, IC01D, IC02D, etc.)
The operation check of the P.C.B. Ass'y
Procedure
1) The input voltage of power trans-
former.
2) The output voltage of power
transformer.
3) IC01D(7812)
4) IC02D(7805)
5) IC01A(KIA7036)
Turn on the main power again.
Does "Beeping" sound is made from the indoor unit?
NO
Specification
1) AC230V ± 30V
: Check the rated voltage
2) 15V ± 1.5V
3) DC12V
4) DC5V
5) The voltage of micom pin 29
: DC4.5V
Troubleshooting Guide
YES
• Primarily, the operating condi-
tion of Micom is O.K.
• Check CN-DISP1
Remedy
1) Replace
power transfomer.
2) Replace
power transfomer.
3) Replace IC01D.
4) Replace IC02D.
5) Replace IC01A.
Service Manual 67