LG A30033W15 Diagram

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Electronic Parts Troubleshooting Guide

1. Product does not operate at all.
(* Refer to Electronic Control Device drawing and Schematic diagram.)

Turn off Main Power

Turn on Main Power

Does "beeping" sound is made from the Indoor Unit?

Primarily, the operating condition of Micom is OK.

Check the voltage of power(About AC 220V/AC240V, 50Hz)

• Main power's voltage

• Voltage applied to the unit

• Connecting method of Indoor/Outdoor connecting

cable

• Check PWB Ass'y

- Fuse

- Pattern damage

- Varistor(ZNR01J)

Check the connection housing for contacting

• Connector related to CN-TAB1, RY-COMP No. 3 PIN

• Connector related to CN-MOTOR

• Connector contacting of Outdoor Fan/Compressor

• Display PWB Ass'y Check

Check each load(Indoor/Outdoor Fan Motor,
Compressor, Stepping Motor) and contacting
condition of related connector

PCB Board Operation Check

Items

• Power Transformer
(Outdoor unit)

- Input Voltage

- Output Voltage

‹X

• IC01D(7812) Output
(Indoor/Outdoor unit)

‹X

• IC02D(7805) Output
(Indoor/Outdoor unit)

‹X

• IC01A(KIA7036, Reset IC)
X01(8MHz)

• Replace Trans

• Replace IC01D

• Replace IC02D

• Replace faulty parts

- About AC220V/240V±10% - Check the power voltage

- About AC14±3V

• DC +12V

• DC +5V

• Voltage of Micom 10,
(DC +4.5V over) and Soldering condition.

Content Remedy

NO

YES

(After 10 seconds)

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2. The product is not operate with the remote controller.

Turn on Main Power

While the compressor has been stopped, the compressor does not

operate owing to the delaying function for 3 minutes after stopped.

Caused by other parts except the remote controller

Cause by the remote controller

When the mark( ) is displayed in LCD screen, replace
battery.

Check the contact of CN-DISPI connector.

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 by force.)

Check DISP PWB Ass'y

- Voltage between CN DISP1 ¤ - ¤ : DC +5V

When the detect switch(double key) inside the remote
controller door is fault, it is impossible to operate

temperature regulating(¡ª/¡ ) and wind speed selecting.

Check the connecting circuit between the remote controller
MICOM (No. § ) - R17(2Ω) - IR LED - Q1 - R16(2.2KΩ).

Check point

• Check the connecting circuit between PIN §ł­R02L 5100 Ω - Cø1L(680PF) - MICOM PIN No. 43

• Check Receiver Ass'y

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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.

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).

When the sensor circuit for indoor temperature and connector are in bad
connection or are not engaged, Compressor/Outdoor Fan is stopped.

• Check the related circuit of R02H(12.1K), R04H(6.2K), Micom (No.26, 27)
(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
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

59) and GND

Between IC01M(No. 15) Below DC 1V

About DC12V

and GND (app)

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Check the TRIAC high speed operation by Remocon.

(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 1, 16)

• Check the pattern

• Check the TRIAC

- TRIAC Open: Indoor Fan Motor never operate

- 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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6. When Heating does not operate

Operate “Heating Mode( )” by setting the desired temperature of the
remote controller 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.

Turn ON Main Power

• 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

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¤ (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

60 61 62 63

3 4 5 6

11 12 13 14

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Check the connector of intake and pipe sensor(thermistors)

• Check the related circuit of R02H(12.1K), R04H(6.2K),
Micom(No. 26, 27).

• Check the indoor room temperature is disconnected or not (about
10KΩ/at 25°C).

• Check the indoor pipe temperature is disconnected or not (about
5KΩ/at 25°C).

Check the DC voltage on the PWB ASS’Y

• The details of check are as followings

Check point

Between Micom

(NO.59) and GND

Between IC01M

(NO.15) and GND

Comp ON

DC 5V

Below DC 1V

Comp OFF

DC 0V

About DC

12V

Check point

Between Micom

(No. 51) and GND

Between IC02M

(No. 15) 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. 14) and GND

Fan ON

DC 5V

Below DC 1V

Fan OFF

DC 0V

About DC 12V

• Comp Relay.

• 4 way Relay

• Outdoor fan Relay

Turn off Main Power

• Check the electrical wiring diagram of outdoor side.

• Check the abnormal condition for the component of
Compressor/Outdoor Fan Motor, 4 way.

• Check the "open" or "short" of connecting wires between indoor and

outdoor.