LG LWC1264AAG_AAN_ACE_ACF_ACN_ACP_BAG_BCF_BCG_BCS_ACG / LWC1264PAG_PAN_PCG_QAG_QAS_QAE / LWC1264AHE_AHF_AHG_ABG_BBG / LWC1264PBG_PHG_QBG_VBS / LWC126CGAB0 / LWC1264BAE / W12LH Service Manual ▷ View online
—25—
Possible Trouble 6
Remote controller does not operate.
Possible Trouble 7
It displays abnormally on display PCB Ass’y.
NO
NO
NO
NO
YES
YES
YES
Is the IC01G all right?
Is the connection of
CN-DISP2 all right?
• Exchange the display
PCB Ass'y.
PCB Ass'y.
• Exchange IC01G.
• Exchange Q12G,
Q13G, Q14G.
Q13G, Q14G.
• Connect connector
to CN-DISP2 exactly.
to CN-DISP2 exactly.
Does the Q12G,
Q13G, Q14G operate normally
on main PCB Ass'y?
• Check the PCB pattern.
Is the voltage of Battery
about over 2.3V?
• Exchange Receiver Ass'y.
Is the connection of
CN-DISP2 all right?
Is the voltage No.10
of CN-DISP2 on Main PCB
Ass'y DC 5V?
• Exchange the battery.
• Check the PCB pattern.
• Connect connector to
CN-DISP2 exactly.
CN-DISP2 exactly.
NO
NO
NO
YES
YES
YES
—26—
Electrical Parts Troubleshooting Guide
LWC1264PBG/PHG, LWC1264VBS/QBG
LWC1264PBG/PHG, LWC1264VBS/QBG
Possible Trouble 1
The unit does not operate.
• Check the Fuse.
• Check the wiring diagram.
• Check the wiring diagram.
Is the Trans output power
AC 220V/240V?
Is the Trans output power
about AC 13V?
Is shorted the Trans. output?
Is output Voltage of IC2
DC 12V?
Is output Voltage of IC3
DC 5V?
Is the voltage No.20 of IC1
DC 5V?
Exchange Main PCB Ass'y.
Is the
connection between
Main and Display
all right?
Is the reset circuit all right?
(The No.16 of
IC1 is 5V.)
• Check the Fuse.
• Check the wiring diagram.
• Check the wiring diagram.
• Check the Main
PCB pattern.
PCB pattern.
• Exchange the Trans.
• Exchange BD1.
• Exchange IC2.
• Exchange IC3.
• Exchange IC4, C07.
• Connect connector
exactly.
exactly.
• Check the PCB
pattern.
pattern.
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
YES
—27—
Possible Trouble 2
The compressor does not operate.
Possible Trouble 3
The compressor always operate.
Is setting
Temp. set lower than Room
Temp.-0.5
°
C?
Is the voltage No.10
of IC7 0V?
• Exchange IC7.
• Select the setting Temp. to lower Number.
• Wait 3 Minutes.
Is the Unit for 3 minutes
delay?
• Exchange MAIN
PCB Ass'y.
PCB Ass'y.
Is the voltage N0.7 of
IC 7 DC 5V?
• Check the RY-COMP.
• Check the wiring
Diagram.
Diagram.
NO
NO
NO
YES
YES
YES
YES
Is the wire connection of
RY-COMP all right?
• Check the RY-COMP.
• Connect LEAD Wire to
RY-COMP again.
RY-COMP again.
NO
YES
NO
—28—
Possible Trouble 4
FAN does not operate.
• Check the PCB pattern.
• Exchange IC1.
• Exchange IC7.
Is the voltage NO.2 or 3
of IC7 DC 5V?
Is the voltage NO.14 or 15
of IC7 0V?
• Check the RY-High or
RY-Low.
• Check the wiring diagram.
NO
NO
YES
YES
Is the voltage of Battery
about over 2•3V?
• Exchange Receiver Ass'y.
Is the connection of
CN-DISP2 all right?
Is the voltage No.7
of CN-DISP2 on Main PCB
Ass'y DC 5V?
• Exchange the battery.
• Check the PCB pattern.
• Connect connector to
CN-DISP2 exactly.
CN-DISP2 exactly.
NO
NO
NO
YES
YES
YES
Possible Trouble 5
Remote controller does not operate.
Click on the first or last page to see other LWC1264AAG_AAN_ACE_ACF_ACN_ACP_BAG_BCF_BCG_BCS_ACG / LWC1264PAG_PAN_PCG_QAG_QAS_QAE / LWC1264AHE_AHF_AHG_ABG_BBG / LWC1264PBG_PHG_QBG_VBS / LWC126CGAB0 / LWC1264BAE / W12LH service manuals if exist.