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LG Manuals
Air Conditioner
Multi-Inverter Type
Service manual
LG Multi-Inverter Service Manual
Multi air conditioner
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Service manual
(87 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Part 1 General Information
Safety Precautions
Model Line up
Outdoor Units
Nomenclature
Part 2 Functions & Controls
List of Functions & Controls
Air Flow
Auto Swing (Left & Right)
Auto Swing (up & Down)
Chaos Swing (Up/Down)
Air Flow Step
Chaos Wind (Auto Wind)
Jet Cool Mode Operation
Swirl Wind Swing
Air Purifying
PLASMA Air Purifying System
Installation Functions
External Static Pressure) Setting
High Ceiling Operation
Reliability
Hot Start
Self-Diagnosis Function
Soft Dry Operation
Convenience Functions & Controls
Auto Changeover Operation
Heat Pump
Cooling Only
Auto Cleaning Operation
Auto Operation (Fuzzy Operation)
Auto Restart Operation
Child Lock Function
Forced Operation
Group Control
Sleep Timer Operation
Timer(On/Off)
Weekly Program
Two Thermistor Control
Special Function & KIT
Zone Controller
Low Ambient Control
Space Control
Auto Elevation Grille
Defrost Control(Heating)
Part 3 Test Run
Check before Test Run
Test Run Flow Chart
Test Runing
Ceiling Cassette Type
Part 4 Trouble Shooting Guide
Self-Diagnosis Function
Pump down
Pumping down
Evacuation
Gas Charging
Cycle Part
Electronic Parts
When Indoor Fan Does Not Operate
When the Louver Does Not Operate
Troubleshooting Indoor Error
Troubleshooting Outdoor Error
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Model Line up
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List of Functions & Controls
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Part 4 Trouble Shooting Guide
4
Self-Diagnosis Function
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Electronic Parts
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http://biz.lgservice.com
Multi Air Conditioner
SVC MANUAL(General)
MODEL : Multi-Inverter Type
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
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Summary of Contents for LG Multi-Inverter
Page 1
Internal Use Only http://biz.lgservice.com Multi Air Conditioner SVC MANUAL(General) MODEL : Multi-Inverter Type CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel.
Page 2: Table Of Contents
1. Self-diagnosis Function ..................46 2. Pump Down ......................50 3. Evacuation......................51 4. Gas Charging .......................52 5. Cycle Part ......................53 6. Electronic Parts....................54 - 1 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 3: Part 1 General Information
Part 1 General Information 1. Safety Precautions ......................3 2. Model Line Up ........................6 3. Nomenclature........................11 - 2 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 4: Safety Precautions
Do not turn the air-conditioner ON or OFF by plugging or unplugging the power plug. There is risk of fire or electrical shock. - 3 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 5
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. - 4 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 6
Check the drainage of the indoor unit after the repair. If drainage is faulty the water to enter the room and wet floor. - 5 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 7: Model Line Up
[MT24AH NH0] * indicates color of panel(B:Blue, C:Cherry, D:Wood, M:Metal, R:Mirror, V:Silver, W:White wood, E:Red, G:Gold, H:White Silver, 1:KISS) - 6 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 8
[MB09AHB NP0] [MB12AHB NP0] AMNH096VEA0 AMNH126VEA0 [MV09AH NE0] [MV12AH NE0] Ceiling & floor AMNH186VBA0 AMNH246VBA0 [MV18AH NB0] [MV24AH NB0] - 7 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 9: Outdoor Units
No. of connectable indoor units Max.5 Total capacity index of connectable 14.1 15.2 indoor units kBtu/h Power supply 1ø, 220-240V, 50Hz Chassis - 8 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 10
Number of BD units to be connected Max.3 Total capacity index of connectable 21.4 indoor units kBtu/h Power supply 3ø, 380-415V, 50Hz Chassis - 9 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 11
PMBD7230 PMBD3640 Connectable indoor unit capacity 2.05~7.03 5.28~10.6 2.05~7.03 5.28~10.6 2.05~7.03 kBtu/h 7~24 18~36 7~24 18~36 7~24 BD unit - 10 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 12: Nomenclature
Indicates that this is multi system outdoor unit using R410A Ex) A4U : Connectable max. 4 indoor units A6U : Connectable max. 6 indoor units - 11 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 13
Ex) 36,000 Btu/h ¡ '36', 72,000 Btu/h ¡ '72' BD : Branch distributor M : Multi system outdoor unit P : Parts - 12 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 14: Part 2 Functions & Controls
7.1 Zone Controller ......................36 7.2 Low Ambient control....................36 7.3 Space Control ......................37 7.4 Auto Elevation Grille....................37 7.5 Defrost Control(Heating) .....................38 - 13 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 15: List Of Functions & Controls
Wireless LCD remote control General central controller General central controller Optional CAC network (Non LGAP) function Dry contact Optional Dry contact - 14 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 16
Soft start for compressor Optional Test function Test operation Notes: The Exploded View part has the particular Function table for each model. - 15 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 17: Air Flow
Mode7 Mode6 Mode5 Mode4 Mode3 7~8° Mode2 OPEN NOTE: Some Models are different by swing width and swing pattern. - 16 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 18: Air Flow Step
After one minute, it is opposite. Vane 1 Vane 3 Vane 4 • Comparison of Air Flow Types 4-Open (conventional) Swirl Swing (New) - 17 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 19: Air Purifying
Dust electrode discharge Dust particles Photo-Catalyst Coated Mesh Ionizer +4.8KV discharge Polluted Air Purified fresh Air Generating plasma Odour Odour molecule - 18 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 20: Installation Functions
R03S R01S HIGH Slide switch for ceiling height 4.1.4 Close the rear cover and check if it works normally. - 19 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 21
AUTO Heater Preheat Defrost Humidify Timer Filter Out door Time ZONE Operation unit Program set Set no. Time 01 - 20 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 22
& E.S.P. which are mentioned in the table. 2. Table data is based at 230V. According to the fluctuation of voltage, air flow rate varies. - 21 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 23: High Ceiling Operation
- When the elevation is high: higher than 3.0m in height. - Operate the device at one level higher than the standard level. - 22 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 24: Reliability
Compressor OFF Temp. ➔ Setting Temp-0.5°C • In 10-min dehumidification operation, the indoor fan operates with the low airflow speed. - 23 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 25: Convenience Functions & Controls
Heating thermo off +0.5°C SET Temp. -0.5°C Cooling thermo off Switching point -2°C Cooling Heating operation Cooling operation operation - 24 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 26
- intake air temperature reaches below 1.0°C of the temperature of setting temp.. • Compressors two minutes time delay. - After compressor off, the compressor can restart minimum 2 minutes later. - 25 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 27
Thermo ON : Setting temp. Thermo OFF : +4 °C above setting temp. Thermo OFF : +3 °C above setting temp. - 26 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 28
Setting fan Indoor fan speed speed 4way Valve * Some Models are different with temperature of indoor fan ON/OFF - 27 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 29: Heat Pump
Setting step 13~14 minutes 1 minute 2~3 minutes (Cooling Only) Unit Operation Indoor Setting step L Low Comp. Setting step - 28 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 30: Auto Operation (Fuzzy Operation)
• While in Fuzzy operation, the airflow speed of the indoor fan repeats the low airflow speed or pause as in dehumidifica- tion operation. - 29 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 31: Auto Restart Operation
Memorized condition are on / off condition, operating mode (cooling/ heating), set temperature and fan speed. The unit will memorize the above conditions and start with same memorized condition. - 30 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 32: Child Lock Function
- The operation will be started if the ON/OFF button is pressed. - If you want to stop operation, re-press the button. - 31 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 33: Group Control
• While executing group control command, use the random data(0-3minutes) in the main body of indoor equipment for limiting starting current. • Control device can control up to 16 indoor equipments. - 32 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 34
• The maximum length of connecting wire should be below 200m(25Ω) on connect- ing each units. • Use a wire more than 0.5mm2 - 33 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 35: Sleep Timer Operation
Operation Time Table (Example) Setting Temp. 25°C 25°C 25°C 25°C 25°C 09:00 08:00 09:00 08:00 09:00 12:00 17:00 12:00 12:00 12:00 - 34 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 36: Two Thermistor Control
• To control the room temperature by a wired remote controller, install controller(room temp. sensor) to sense the temperature more accurately. • Maunfactured in the position 1. - 35 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 37: Special Function & Kit
• It can prevent frosting of evaporator and keep cooling operation Outdoor pipe T2°C T1°C Outdoor Setting Setting Setting Speed Fan Speed Speed Speed - 36 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 38: Space Control
• In case when obstacle such as curtain hides the signal reception part of receiver in between the space interval, Remote Controller operation is infeasible. - 37 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 39: Defrost Control(Heating)
• The second defrost starts only when the outdoor pipe temperature falls below – 6°C after from ending of the first defrost and more than 4 minutes operation of compressor. - 38 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 40: Part 3 Test Run
3. Test Run 3. Test Run 1. Check before Test Run.....................40 2. Test Run Flow chart ......................41 3. Test Running........................42 - 39 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 41: Check Before Test Run
2.0 MΩ as a result of refrigerant accumulation in the internal compressor. If the insulation resistance is less than 2.0 MΩ, turn on the main power supply. - 40 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 42: Test Run Flow Chart
Guide Normal • Each indoor unit should be tested. • If the unit has accessory, it should be tested. - 41 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 43: Test Runing
I In the case when the vibration of the unit is conveyed to the hose, secure the unit with an anti-vibration rubber. Discharge temperature - 42 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 44
PCB Assembly to the ' CEILING' state. ¡Ø The initial state of the slide switch is set for the bottom installation. CN_INSTALL CEILING BOTTOM - 43 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 45: Ceiling Cassette Type
❏ Aren't terminal screws loosened? (refrigerant and drain piping)? ❏ Is there any leakage of refrigerant? M4..118N.cm{12kgf.cm} M5..196N.cm{20kgf.cm} M6..245N.cm{25kgf.cm} M8..588N.cm{60kgf.cm} - 44 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 46: Part 4 Trouble Shooting Guide
1. Self-diagnosis Function....................46 2. Pump Down........................50 3. Evacuation ........................51 4. Gas Charging ........................52 5. Cycle Part ........................53 6. Electronic Parts ......................54 - 45 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 47: Self-Diagnosis Function
Float switch Open Communication(Indoor ↔ Outdoor) Communication Poorly Outlet pipe sensor Open / Short Different operation mode Different operation mode - 46 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 48
7times ¢Å Outdoor Fan is not operating PFC Fault Error(S/W) 7times ¢Å 3times ¢Å Over Current of Outdoor Unit PFC - 47 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 49
Signal Error(DSP Board <-> Main Board) 5times ¢Å 2times ¢Å Signal Error (Indoor <-> Outdoor) 5times ¢Å 3times ¢Å - 48 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 50
6times ¢Å 5times ¢Å Outdoor BLDC Fan Lock 6times ¢Å 7times ¢Å PFC Fault Error(S/W) 7times ¢Å 3times ¢Å - 49 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 51: Pump Down
– Open the low-pressure valve on the charge set slightly to air purge from the charge hose. (5) Set the 2-way valve to the closed position. - 50 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 52: Evacuation
(4) Disconnect the charge hose from the vacuum pump. – Vacuum pump oil. If the vacuum pump oil becomes dirty or depleted, replenish as needed. - 51 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 53: Gas Charging
1 minute and then repeat the procedure (pumping down-pin). - 52 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 54: Cycle Part
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty. - 53 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 55: Electronic Parts
4) Replace P.C.B Ass'y 5) IC01A(KIA7036) 5) The voltage of micom pin 19 5) Replace P.C.B Ass'y : DC4.5V↑ - 54 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 56
* Check display P.C.B Assembly - Voltage between CN-DISP1 should be DC +5V, - If problem still persists, Replace display PCB - 55 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 57
Check the electrical wiring diagram of Outdoor side. Check the open or short of connecting wires between Indoor and Outdoor. - 56 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 58: When Indoor Fan Does Not Operate
The voltage of Pin No 1(orange) and 3(black) of CN-FAN. About AC 160V over About AC 50V over SSR is not damaged Check SSR - 57 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 59: When The Louver Does Not Operate
If there are no problems after above checks. • Confirm the assembly condition that are catching and interfering parts in the link of the vertical louver - 58 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 60: Troubleshooting Indoor Error
8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. ¡ Repair or Change the PCB. - 59 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 61
3. Check the volt. Of main PCB power source. (DC 12V, DC 5V) ¡ Repair or Change the main PCB. 4. Check the installation of wired remote controller. (Noise interference) ¡ Adjust the state of installation - 60 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 62
3. Check the level of water 4. Check the volt. Of Drain pump power supply. (AC 230V) ¡ Repair or Change the main PCB. - 61 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 63: Troubleshooting Outdoor Error
¡ Check the another indoor unit. * CH05 is displayed at indoor unit, CH53 is displayed at out- door unit. - 62 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 64
5. Check the insulation from water at IPM part. ¡ Check the trace of water. 6. Check the IPM circuit. - 63 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 65
2. Check the fan operation is right. 3. Check the current. 4. Check the install condition. 5. Check the internal circuit. (C/T, Diode, Resistor) - 64 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 66
• Check the components. Check Point 1. Check the power source. 2. Check the components (B/Diode, Reactor, PSC Parts ) - 65 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 67
2. Check the install condition for over load. (Trans1, B/Diode, Diode, Resistance) 3. Check the SVC V/V open. 4. Check the leakage of refrigerant. - 66 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 68
2. Check the components 2. Check the insulation of IPM part. (IGBT, R04S, NF1, BD02S) 3. Check the compressor. (same with CH21) - 67 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 69
3. Check the leakage of refrigerant. 3. Check the leakage of refrigerant. 4. Check the constant compressor. (same with CH21) - 68 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 70
3. If the resistance of the sensor is 0 kΩ or ∞, then sensor is abnormal. Ω If the voltage of the sensor is 0 V or 5Vdc, then sensor is abnormal. - 69 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 71
• CH 51 1. Check the insertion condition of EEPROM. 1. Check the indoor unit capacity. 2. Check the poor soldering - 70 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 72
1. Check the install condition for over load. (Refrigerant, Pipe length, Blocked, …) 2. Check the Outdoor temp. is very high. - 71 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 73
2. In Case of CH53, Check the Connection ¡ CN-COMM at the Main PCB ¡ L , N at the terminal block CN-COMM CN-Power < MAIN PCB > - 72 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 74
Resistance(Ω) at 20°C Constant Inverter Terminal comp. comp. Ω U-GND 2MΩ 2MΩ V-GND 2MΩ 2MΩ W-GND 2MΩ 2MΩ - 73 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 75
In case that the control box is opend and before checking electrical parts, it should be checked that the LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock. - 74 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 76
In case that the control box is opend and before checking electrical parts, it should be checked that the LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock. - 75 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 77
Check inverter PCB assembly IPM normality Is inverter PCB assembly ¡ Replace inverter PCB assembly normal? Recheck power and installation condition - 76 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 78
< Input Power Source Check Point > < Main PCB> <CT Sensing Check Point> < Inverter PCB> <CT Sensing Check Point> - 77 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 79
Power connection normal? Inverter PCB assembly CN(L), CN(N) Replace inverter PCB assembly Is Inverter PCB Normal? Recheck power and installation condition - 78 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 80
< Input Power Source Check Point > 27/30/40k < Main PCB> <DC_LINK Sensing Check Point> <DC Link Voltage Check Point> - 79 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 81
48/56k < Inverter PCB> <DC Link Voltage Check Point> <Connection Check Point> DC_LINK DC_LINK DC_LINK <DC_LINK Sensing Check Point> - 80 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 82
LGMV similar as Replace high pressure sensor at manifold gauge? Check pipe is blocked or not and take measure - 81 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 83
< Checking the Press switch > 48/56k < Main PCB : Connection Check Point > < Checking the H/press switch > - 82 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 84
1. Check the Input Voltage (L–N ➔ 220V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) < Input Power Source Check Point > - 83 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 85
< Input Voltage Sensing Check Point > < Inverter PCB> 48/56k INPUT(V) INPUT(V) INPUT(V) < Input Voltage Sensing Check Point > < Inverter PCB> - 84 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 86
Check inverter PCB assembly IPM normality Is inverter PCB assembly normal? ¡ Replace inverter PCB assembly Recheck power and installation condition - 85 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 87
¨é Replace PCB assembly if it is short between pins Signal pin Signal pin Signal pin except No.4,5 pins. CAUTION PFCM module No.4,5 pins are internal short state. - 86 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 88
Power connection normal? Inverter PCB assembly CN(L), CN(N) Is Inverter PCB Normal? Replace inverter PCB assembly Recheck power and installation condition - 87 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 89
< Input Power Source Check Point > 27/30/40k < Main PCB> <DC_LINK Sensing Check Point> <DC Link Voltage Check Point> - 88 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 90
48/56k < Inverter PCB> <DC Link Voltage Check Point> <Connection Check Point> DC_LINK DC_LINK DC_LINK <DC_LINK Sensing Check Point> - 89 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 91
Check inverter PCB assembly IPM normality Is inverter PCB assembly ¡ Replace inverter PCB assembly normal? Recheck power and installation condition - 90 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 92
1. Check the Input Voltage (L–N ➔ 220V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) < Input Power Source Check Point > - 91 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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< CT Sensing Check Point > < Inverter PCB> 48/56k INPUT(CT) INPUT(CT) INPUT(CT) < CT Sensing Check Point > < Inverter PCB> - 92 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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Replace inverter compressor PCB Check Point - Check the Transmission connector and LED (Main & Inverter) 48/56k <Inverter PCB> <MAIN PCB> - 93 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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Recheck power and installation condition Check Point - Check the EEPROM Check sum & Direction 27/30/40k <MAIN PCB> <EEPROM Direction Check Point> - 94 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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4. Trouble Shooting 48/56k <MAIN PCB> <Inverter PCB> <EEPROM Direction Check Point> - 95 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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2. Check resistance between No.24 pin and NO.25 pin of PCB PFC module - only 48/56k 3. Resistance value should be in 7kΩ ±10%.(at 25°C). - 96 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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Measuring resistance between No.19,20 pin 48/56k PFCM : IPM : Measuring resistance Measuring resistance between No.19,20 pin between No.24,25 pin - 97 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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3. Resistance value should be in 7kΩ ±10%.(at 25°C). 4. Check the PFC Module No.19, 20 and IPM Module No.24, 25 pin soldering condition. - 98 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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Measuring resistance between No.19,20 pin 48/56k PFCM : IPM : Measuring resistance Measuring resistance between No.19,20 pin between No.24,25 pin - 99 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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1. Check voltage between 1pin and 4pin of Fan Mortor connector (Tester diode mode) 2. Voltage vaule should be in 1V ±0.2V. - 100 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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27/30/40k Check voltage betwen 1pin and 4pin of fan motor Fan motor connector Tester <Main PCB> 48/56k <Inverter PCB> - 101 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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Is inverter PCB assembly Check inverter PCB assembly IPM normality normal? ¡ Replace inverter PCB assembly Recheck power and installation condition - 102 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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< Noise Filter wiring Check Point > < Main PCB wiring Check Point > < Input Power Source Check Point > - 103 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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< Noise Filter wiring Check Point > < Input Power Source Check Point > < Inverter PCB wiring Check Point > - 104 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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¡ CN- INVERTER at the Noise Filter < Noise Filter > AC-220V AC-220V AC-220V MAIN-COMM MAIN-COMM MAIN-COMM < INVERTER PCB > - 105 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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1.083 1.123 1.096 Copper Comp pipe Resistance(Ω) at 20°C Inverter Terminal comp. Ω U-GND 50MΩ V-GND 50MΩ 50MΩ W-GND - 106 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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In case that the control box is opend and before checking electrical parts, it should be checked that the LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock. - 107 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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Check inverter PCB assembly IPM normality Is inverter PCB assembly ¡ Replace inverter PCB assembly normal? Recheck power and installation condition - 108 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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5. Check the CT Sensor Output signal (Check output pin 1.2 of the CT Sensor : 5V ) Tester CT Sensor Output (at the INVERTER PCB) - 109 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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Inverter PCB assembly CN_L1(R), CN_L2(S), CN_L3(T) Power connection normal? Replace inverter PCB assembly Is Inverter PCB Normal? Recheck power and installation condition - 110 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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<DC Link Voltage Check Point> Tester DC Link DC Link Voltage INV DC Link Voltage INV oltage INV <INPUT VOLTAGE Check Point> - 111 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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< CH25 Check Point > INPUT VOL INPUT VOLTAGE INV INPUT VOLTAGE INV AGE INV <INPUT VOLTAGE Check Point> - 112 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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W V U 4. Check the IPM.(Refer 106 page) 5. Check the pressure of refrigerant. 6. Check the Service Valve Open. - 113 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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2. Check the Service Valve open. 3. Check the outdoor fan operating condition 4. Check the leakage of refrigerant. - 114 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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Upgrade Micom Program S/W Program normal? Replace inverter PCB assembly Is Inverter PCB assembly normal? Recheck power and installation condition - 115 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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COMP CURRENT CURRENT U,V,W U,V,W <INVERTER PCB> INPUT INPUT INPUT VOLTAGE INV VOLTAGE INV AGE INV <INPUT VOLTAGE Check Point> - 116 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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3. If the resistance of the sensor is 0 kΩ or ∞, then sensor is abnormal. Ω If the voltage of the sensor is 0 V or 5Vdc, then sensor is abnormal. - 117 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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• CH 51 1. Check the insertion condition of EEPROM. 1. Check the indoor unit capacity. 2. Check the poor soldering - 118 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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<Noise Filter Connection Check> CN-L3(T) CN-L3(T) CN-L3(T) CN-L1(R) CN-L1(R) CN-L1(R) CN-AC-220V CN-AC-220V CN-AC-220V CN-L2(S) CN-L2(S) CN-L2(S) <INVERTER PCB Connection Check> - 119 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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Replace the heatsink sensor (10kΩ ±10% at 25°C) Replace the heatsink sensor Is normal Inverter PCB ? Recheck power and installation condition - 120 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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Is Fan motor nomal? Replace inverter PCB assembly <INVERTER PCB connection> <fan motor middle connection> <FAN Motor Connection check> - 121 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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APRIL, 2008 P/NO : MFL36552501...
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