LG LS-J0762Y / S07LHN Service Manual ▷ View online
-61-
■
The problem of missing the connector (INDOOR MAIN PCB ASSY)
■
The problem of missing the connector (OUTDOOR MAIN PCB ASSY)
Connectors
CN-POWER
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 remocon, force, test operation mode.
• Malfunctions outdoor unit.
• Stop compressor and outdoor fan motor.
• The operation LED blinks 5 times.
• Communicaion error.
• 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.
• Don't operate the power display module.
• The operation LED blinks twice.
• Enable to receive remote singnal.
• Enable to receive remote singnal.
• Malfunctions UP/DOWN step motor.
• Don't operate louver.
• Don't operate louver.
• Malfunctions indoor fan motor.
Problem (error mode)
Connectors
Condition
OPEN
OPEN
OPEN
• Stop compressor.
• Malfunctions 4-WAY valve.
• Malfunctions fan
Problem (error mode)
CN-TH
CN-UVW
CN-4 WAY
CN-FAN
CN-COMP
OPEN/SHORT
OPEN/SHORT
• The operation LED blinks twice.
• The LED01M blinks twice.
• The LED01M blinks twice.
• The LED01M blinks 10 times.
• Continue Comp. operation.
• Continue Comp. operation.
(when the discharge pipe TH opens)
• Stop Comp. operation
(when the discharge pipe TH shorts)
-53-
Turn on main power.
While the compressor has been stopped, the compressor does not operate
owing to the delaying function for 2 minutes after stopped.
When the compressor stopped Indoor Fan is driven by a low speed.
At this point the wind speed is not controlled by the remote controller.
(When operated in the Sleeping Mode, the wind speed is set to the low speed as force).)
Caused by the remote controller.
Caused by other parts except
the remote controller
When the mark ( ) is displayed in LCD
screen, replace battery.
Check the contact of CN-DISP 1, 2 connector
When the detect switch (double key) inside the
remote controller door is fault, it is impossible to
operate temperature regulating(
▲
/
▼
) and wind
speed selecting.
Check DISP PWB Ass'y
-Voltage between CN1
-
: DC +5V
Check the connecting circuit between the
remote controller MICOM(No.30)-R17(2
Ω
)-IR-
LED-Tr-R16(2.2k
Ω
)
Check point
• Check the connecting circuit between
• Check the connecting circuit between
MICOM PIN
• Check receiver ass'y
Product doesn't operate with the remote controller.
Trouble 2
-54-
Turn on the main power.
When in air circulation mode, compressor/outdoor fan is stopped.
Turn off main power.
Check the electrical wiring diagram of Outdoor side.
Check the open or short of connecting wires between Indoor and Outdoor.
Check the open or short of connecting wires between Indoor and Outdoor.
Check the sensor for Indoor temperature is attatched as close as to be effected by the
themperature of Heat Exchange (EVA.)
themperature of Heat Exchange (EVA.)
When the sensor circuit for Indoor temperature and connector are in bad connection or are
not engaged, Compressor/Outdoor fan is stopped.
not engaged, Compressor/Outdoor fan is stopped.
• Check the related circuit of R02H(12.1K), R01H(6.2K), R04H(1K), R03H(1K), C01H(103),
C02H(103), Micom(pin No. 4.5).
• Check the Indoor temperature sensor is disconnected or not (about 10K at 25°C).
Check the Relay(RY-PWR) for driving Compressor.
• Check the voltage between brown and blue cable of terminal to connect the Outdoor
(About AC220V / 240V).
• Check the related circuit of relay in Outdoor PCB Ass'y.
Operate Cooling Mode by setting the disired temperature of the remote controller is less
than one of the Indoor temperature by 1°C at least.
than one of the Indoor temperature by 1°C at least.
The Compressor/Outdoor Fan are unable to drive.
Trouble 3
Check Point
Between Micom(No. 46) and
GND
GND
DC 5V
DC 0V
DC 12V
DC 1V
↓
Between IC01M(No. 15) and
GND
GND
Comp. ON
Comp. OFF
-55-
When indoor Fan does not operate.
Trouble 4
Check the SSR high speed operation by remote control.
(the Indoor Fan Motor is connected)
Turn off main power.
Check the connection of CN-MOTOR.
Check the Fan Motor.
Check the Fuse(AC250V, T2A).
Turn on the main power
Check the related circuit of indoor Fan Motor.
• The pin No.45 of micom and the part for driving SSR.
• Check the related pattern.
• Check the SSR.
• Check the related pattern.
• Check the SSR.
- SSR Open: Indoor Fan Motor never operate.
- SSR short: Indoor Fan Motor always operates in case of ON or OFF.
- SSR short: Indoor Fan Motor always operates in case of ON or OFF.
The voltage of Pin No 1(orange) and 3(black) of CN-MOTOR.
About AC 180V over
About AC 50V over
SSR is not damaged
Check SSR
Click on the first or last page to see other LS-J0762Y / S07LHN service manuals if exist.