LG LBNG3061YL Service Manual page 33

Electronic Parts Troubleshooting Guide
g Refer to electronic contorol device drawing & schematic diagram.
The Product doesnʼt operate at all.
Trouble 1
Check the voltage of power(AC220V/AC240V, 50Hz).
• 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
transformer.
2) The output voltage of power
transformer.
3) IC01D(7812)
4) IC02D(7805)
5) IC01A(KIA7036)
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Only for training and service purposes
Turn off the main power and wait to 5 seconds
Turn on the main power again.
Is the LCD of wired remote controller operate normally?
NO
Specification
1) AC230V ± 30V
: Check the rated voltage
2) 14V ± 3V
3) DC12V
4) DC5V
5) The voltage of micom pin 29
: DC4.5V↑
- 33 -
YES
• Primarily, the operating
condition of Micom is O.K.
Remedy
1) Replace
power transfomer.
2) Replace
power transfomer.
3) Replace IC01D.
4) Replace IC02D.
5) Replace IC01A.
LGE Internal Use Only