DOWNLOAD LG LS-J0760NL / LS-J0820NL / LS-J0961NL_NT / LS-L1220NL / LS-L1260NL_NT Service Manual ↓ Size: 2.07 MB | Pages: 74 in PDF or view online for FREE

Model
LS-J0760NL LS-J0820NL LS-J0961NL_NT LS-L1220NL LS-L1260NL_NT
Pages
74
Size
2.07 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner
File
ls-j0760nl.zip
Date
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LG LS-J0760NL / LS-J0820NL / LS-J0961NL_NT / LS-L1220NL / LS-L1260NL_NT Service Manual ▷ View online

Cycle Troubleshooting Guide 
Trouble analysis 
1. Check temperature difference between intake and discharge air and operating current. 
Temp. Difference 
Temp. difference   :   approx. 0°C
Current                  :   less than 80% of 
rated current  
Temp. difference   :   approx. 8°C
Current                  :   less than 80% of 
rated current  
Temp. difference   :   less than 8°C
Current                  :   over the reated
current 
Temp. difference   :   over 8°C 
Operating Current 
• All amount of refrigerant leaked
out. Check refrigeration cycle.
• Refrigerant leakege
Clog of refrigeration cycle
Defective compressor 
• Excessive amount of refrigerant
• Normal 
Notice : 
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger. 
2. Check temperature and pressure of refrigeration cycle. 
Notice : 
1. The suction pressure is usually 4.0~6.0 kg/cm
2
G(Cooling) at normal condition. 
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty. 
Suction pressure
Temperature
(Compared with
(Compared with
Cause of Trouble
Description
the normal value)
the normal valve)
Defective compressor
Current is low.
Defective 4-way reverse valve
Excessive amount of
High pressure does not quickly
Normal
refrigerant
rise at the beginning of 
operation.
Insufficient amount of 
Current is low.
Lower 
Higher
refrigerant (Leakage)
Clogging
Current is low.
High 
Higher  
-51-
Electronic Parts Troubleshooting Guide
-54-
❇
Refer to electronic contorol device drawing & schematic diagram.
The Product doesn’t operate at all.
Turn off the main power and wait to 5 seconds
Turn on the main power again.
Does "Beeping" sound is made from the indoor unit?
• Primarily, the operating
condition of Micom is O.K.
• Check CN-DISP1
CN-DISP2
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, Bridge Diode, etc.)
Trouble 1
NO
YES
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)
Specification
1) AC230V ± 30V
: Check the rated voltage
2) 14V ± 3V
3) DC12V
4) DC5V
5) The voltage of micom pin 29 
: DC4.5V
↑
Remedy
1) Replace 
power transfomer.
2) Replace 
power transfomer.
3) Replace IC01D.
4) Replace IC02D.
5) Replace IC01A.
-63-
■
The problem of missing the connector (INDOOR MAIN PCB ASSY)
Connectors
CN-POWER
(AC2)
CN-FAN
CN-DATA
CN-DISP1
CN-DISP2
CN-TH
CN-U/D
Condition
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN/SHORT
OPEN
• Malfunctions all indoor & outdoor unit.
• Malfunctions remocon, force, test operation mode.
• Malfunctions outdoor unit.
• Stop compressor and outdoor fan motor.
• The operation LED blinks 5 times.
• Communicaion error.
• Malfunctions remote contoller.
• Don't operate the power display module.
• Don't operate the power display module.
• The operation LED blinks twice.
• Enable to receive remote singnal.
• Malfunctions UP/DOWN step motor.
• Don't operate louver.
• Malfunctions indoor fan motor.
Problem (error mode)
-64-
■
The problem of missing the connector (SUB PCB ASSY)
Connectors
CN-UVW
CN-AC
CN-DC
CN-IPM
Condition
OPEN
OPEN
OPEN
OPEN
• Stop compressor.
• Malfunctions outdoor unit.
• Stop compressor and outdoor fan.
• The operation LED blinks 5 times.
• Malfunctions PFC & inverter circuit.
• Stop compressor and outdoor fan.
• Malfunctions outdoor unit.
• Stop compressor and outdoor fan.
• The operation LED blinks 5 times.
Problem (error mode)
■
The problem of missing the connector (OUTDOOR MAIN PCB ASSY)
Connectors
CN-POWER
CN-AC
CN-DC
CN-IPM
CN-GND1,2
CN-HEAT
CN-4WAY
CN-FAN
CN-OLP
CN-TH
CN-COMP
Condition
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN/SHORT
OPEN/SHORT
OPEN/SHORT
• Malfunctions outdoor unit.
• Stop compressor and outdoor fan.
• The operation LED blinks 5 times.
• Malfunctions outdoor unit.
• Stop compressor and outdoor fan.
• The operation LED blinks 5 times.
• Malfunctions PFC & inverter circuit.
• Stop compressor and outdoor fan.
• Malfunctions EMI /EMS
• Malfunctions Sump Heater
• Malfunctions 4-WAY valve.
• Malfunctions fan.
• Malfunctions Comp. Motor.
• The operation LED blinks 4 times.
• The LED01K blinks 4 times.
• The operation LED blinks twice.
• The LED01K blinks twice.
• The LED01K blinks 10 times.
• Continue Comp. operation.
(when the discharge pipe TH opens)
• Stop Comp. operation
(when the discharge pipe TH shorts)
• Malfunctions outdoor unit.
• Stop compressor and outdoor fan.
• The operation LED blinks 5 times.
Problem (error mode)
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