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Model: LS-M3060HL LS-M3060CL LS-M3061HL LS-M3061CL LS-M3064HL LS-M3064CL LS-M3221HL LS-M3221CL LS-N3660HL LS-N3660CL LS-N3661HL LS-N3661CL LS-N3821HL LS-N3821CL
Pages: 80
Size: 5.5 MB
Type: PDF
Document: Service Manual
Brand: LG
Device: Air Conditioner
File: ls-n3661hl.zip
Date: 2018-11-20

LG LS-M3060HL / LS-M3060CL / LS-M3061HL / LS-M3061CL / LS-M3064HL / LS-M3064CL / LS-M3221HL / LS-M3221CL / LS-N3660HL / LS-N3660CL / LS-N3661HL / LS-N3661CL / LS-N3821HL / LS-N3821CL Service Manual ▷ View online

- 54 -
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-POWER
• 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
• IC01D(7812) Output (Outdoor unit)
• IC02D(7805) Output (Outdoor unit)
IC04D(7805) Output (Indoor unit)
• IC01A(KIA7036, Reset IC)
OSC01B(8MHz) (Indoor unit)
• IC01A(KIA7036, Reset IC)
OSC01B(4MHz) (Outdoor unit)
• Replace Trans
• Replace IC01D
(Outdoor unit)
• Replace IC02D
(Outdoor unit)
IC04D(Indoor unit)
• Replace faulty parts
- About AC220V/240V±10% - Check the power voltage
- About AC14±3V
• DC +12V
• DC +5V
• Voltage of Micom No. 2, (Indoor unit)
(DC +4.5V over) and Soldering condition.
No. 5 (Outdoor unit)
Content
Remedy
NO
YES
(After 10 seconds)

- 55 -
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-DISP 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 DISP 
- 
: DC +5V
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 the connecting circuit between the remote controller
MICOM (No.  ) - R17(2
Ω
) - IR LED - Q1 - R16(2.2K
Ω
).
Check point
• Check the connecting circuit between PIN 
-
Rø1L(1K) - Cø1L(680PF) - MICOM PIN
• Check Receiver Ass'y

- 56 -
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 tempera-
ture 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.3.4) (Indoor unit).
• Check the related circuit of R04H (6.2K) Micom (No.3) (Output 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 - COMP2) for driving compressor.(Outdoor unit)
• 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.15) and GND
DC5V
DC0V
Between Relay (G5N-1A) (No.1)
DC12V
DC0V
and (G5N-1A) (No.4)
Between CN-COMP2
AC 220~240V
Below AC 10V
and CN-POWER 2(N)

- 57 -
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 2, 15)
• 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

Display

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