LG LS-J0763EL Service Manual ▷ View online
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3. Compressor/Outdoor Fan are unable to drive.
Turn on Main Power
Operate "Cooling Mode( )" by setting the desired temperature of the
remote controller is less than one of the indoor temperature by 1°C at least.
remote controller is less than one of the indoor temperature by 1°C at least.
When in Air Circulation Mode, Compressor/Outdoor Fan is stopped.
Check the sensor for indoor temperature is attached as close as to be
effected by the temperature of Heat Exchanger(EVA).
effected by the temperature of Heat Exchanger(EVA).
When the sensor circuit for indoor temperature and connector are in bad
connection or are not engaged, Compressor/Outdoor Fan is stopped.
connection or are not engaged, Compressor/Outdoor Fan is stopped.
• Check the related circuit of R02H(12.1K), R01H(1.0K), R04H(6.2K),
R03H(1.0K) Micom (No.3.4) (Indoor unit).
• Check the indoor temperature sensor is disconnected or not(About 10k
Ω
/ at 25°C).
Turn off Main Power
• Check the electrical wiring diagram of outdoor side.
• Check the abnormal condition for the component of
• Check the abnormal condition for the component of
Compressor/Outdoor Fan Motor.
• Check the "open" or "short" of conmecting wires between indoor and
outdoor.
Check Relay(RY - COMP) for driving compressor.
• When the power(About AC220V/240V) is applied to the connecting wire
terminal support transferred to compressor, PWB Ass'y is normal.
• Check the circuit related to the relay.
Check point
COMP ON
COMP OFF
Between Micom(No.
DC5V
DC0V
62) and GND
Between IC01M(No. 14)
Below DC 1V
About DC12V
and GND
(app)
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Check the TRIAC 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 Main Power
Check the related circuit of indoor Fan Motor.
• The pin NO 63 of Micom, and the part for driving TRIAC(the input and
output signal of IC01M, PIN NO 2, 15)
• Check the pattern
• Check the TRIAC
• Check the TRIAC
- TRIAC Open: Indoor Fan Motor never operate
- TRIAC short: Indoor Fan Motor always operates in case of ON or OFF.
- TRIAC short: Indoor Fan Motor always operates in case of ON or OFF.
4. When indoor Fan does not operate.
The voltage of PIN NO 1(blue) and 3(yellow) of CN-MOTOR.
About AC 180V over
About AC 50V over
TRIAC is not damaged
TRIAC Check
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• Confirm that the Vertical Louver is normally geared with the shaft of
Stepping Motor.
• If the regular torque is detected when rotating the Vertical Louver with
hands
⇒
Normal
• Check the connecting condition of CN-U/D Connector
• Check the soldering condition(on PWB) of CN-U/D Connector
• Check the soldering condition(on PWB) of CN-U/D Connector
If there are no problems after above checks
• Confirm the assembly conditions that are catching and interfering parts
in the rotation radial of the Vertical Louver
5. When Vertical Louver does not operate.
Check the operating circuit of the Vertical Louver
• Confirm that there is DC +12V between pin
①
(RED) of CN-U/D and
GND.
• Confirm that there is a soldering short at following terminals.
- Between
, ,
and
of MICOM
- Between
,
,
and
of IC01M
- Between
,
,
and
of IC01M
58
59
60
61
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6. When Heating does not operate
Operate “Heating Mode( )” by setting the desired temperature of the
remote control is higher than one of the indoor temperature by 2°C at
least.
remote control is higher than one of the indoor temperature by 2°C at
least.
In heating Mode, the indoor fan operates in case the pipe temperature
is higher than 28°C.
is higher than 28°C.
Check the connector of intake and pipe sensor(thermistors)
• Check the related circuit of R02H(12.1K), R01H(1.0K), R04H(6.2K),
R03H(1.0K), Micom(No. 3, 4).
• Check the indoor room temperature is disconnected or not (about
10K
Ω
/at 25°C).
• Check the indoor pipe temperature is disconnected or not (about
5K
Ω
/at 25°C).
Turn ON Main Power
Check the DC voltage on the PWB ASS’Y
• The details of check are as followings
Check point
Between Micom
(NO.62) and GND
Between IC01M
(NO.14) and GND
Comp ON
DC 5V
Below DC 1V
Comp OFF
DC 0V
About DC
12V
Check point
Between Micom
(NO.54) and GND
Between IC02M
(NO.16) and GND
4 way ON
DC 5V
Below DC 1V
4 way OFF
DC 0V
About DC 12V
Check point
Between Micom
(NO.53) and GND
Between IC02M
(NO.15) and GND
Fan ON
DC 5V
Below DC 1V
Fan OFF
DC 0V
About DC 12V
• Comp Relay.
• 4 way Relay
• Outdoor fan Relay
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