LG Multi-Inverter Type Service Manual
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LG Multi-Inverter Type Service Manual

Multi air conditioner
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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.

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  • 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 ..................41 2. Pump Down ......................43 3. Evacuation......................44 4. Gas Charging .......................45 5. Cycle Part ......................46 6. Electronic Parts....................47 - 1 - Copyright ©2010 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........................7 - 2 - Copyright ©2010 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 ©2010 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 ©2010 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 ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Model Line Up

    No. of connectable indoor units Max.2 Max.3 Max.4 Max.4 Total capacity index of connectable indoor units Power supply 1Ø, 208~230V, 60Hz Chassis - 6 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 8: Nomenclature

    Indicates that this is multi system outdoor unit using R410A Ex) A2U : Connectable max. 2 indoor units A4U : Connectable max. 4 indoor units - 7 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Part 2 Functions & Controls

    6.4 Child Lock Function.....................22 6.5 Forced operation ......................22 6.6 Sleep Timer Operation ....................23 6.7 Timer(On/Off) ......................23 6.8 Defrost Control (Heating) ....................23 - 8 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: 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 - 9 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 Soft start for compressor Optional Test function Test operation Notes: The Exploded View part has the particular Function table for each model. - 10 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 12: List Of Functions

    Option : Model name & price are different according to options, and assembled in factory with main unit. Accessory : Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 11 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Air Flow

    Mode7 Mode6 Mode5 Mode4 Mode3 7~8° Mode2 OPEN NOTE: Some Models are different by swing width and swing pattern. - 12 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 14: 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) - 13 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: 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 - 14 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 16: Installation Functions

    • The central control could operate inappropriately depends on indoor unit type, when the remote controller is set as slave. - 15 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: How To Set E.s.p

    ❈ The E.S.P value is set at the proper value at the factory. So it is highly recommended that you should not change the E.S.P value at your discretion. - 16 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 18: High Ceiling Operation

    Selection of speed can be done by slide switch at the back of the LCD wired remote. installation on the higher ceiling Installation on the normal-height ceiling - 17 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: Reliability

    Compressor OFF Temp. ➔ Setting Temp-1°F(0.5°C) • In 10-min dehumidification operation, the indoor fan operates with the low airflow speed. - 18 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 20: Convenience Functions & Controls

    Setting step 13~14 minutes 1 minute 2~3 minutes (Cooling Only) Unit Operation Indoor Setting step L Low Comp. Setting step - 19 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 21: 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. - 20 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 22: 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. - 21 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 23: 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. - 22 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: Sleep Timer Operation

    • 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. - 23 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: Part 3 Control Logic

    7. Defrost Control .........................31 8. LEV Control........................32 9. Oil restoration operation....................34 10. Compressor warm-up control logic................34 11. Heat sink control......................35 - 24 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 26: Compressor

    Frequency → Number of poles BLDC Motor IPM (Inverter) U V W X Y Z Position Detect (16Bits) Circuit - 25 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 27: Step(Frequency) Control

    ✽ The compressor get the minimum step in case Step base value is lower than the minimum step of operating capacity. - 26 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 28: Reversing Valve Operation

    7. If the compressor is stopped during heating mode by Thermistor signal, reversing valve will remain in heating position. - 27 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 29: Discharge Pipe Control

    T1:90 (Option)˚C Hz(Option) COMP Hz (Option) Down Down 10 pulse 10 pulse Expansion valve Stop control (Option) up (Option) up - 28 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 30: Input Current Control

    5 Hz 5 Hz Frequency Setting Frequency Frequency Setting Frequency (Option) (Option) frequency fixed fixed frequency fixed [Hz] Down Down - 29 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 31: Outdoor Fan Control

    26°C 45°C 22°C 41°C 18°C 38°C 14°C 28°C 24°C 10°C 18°C 4°C 14°C 0°C -4°C 9°C 2°C -8°C -3°C - 30 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 32: Defrost Control

    Indoor defrost signal OFF indoor unit on/ Starting maximum defrosting time count Reversing Valve start Indoor Fan ON/OFF Outdoor Fan - 31 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: Lev Control

    Comp (Reset) Open Close -200 time Starting Time constant Initializin Starting control control control Heating and cooling Heating Cooling - 32 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 2. When the temperature reaches 4˚C, system return to the starting control pulse value. Pull open Starting LEV Target Pulse opening Target step Time (Option) Comp starting Time(sec) - 33 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 35: Oil Restoration Operation

    Opening target : 0.7 300 sec. 0 sec. 0 sec. 0 sec. 180 sec. 90 sec. Time (option) Time (option) Time (option) - 34 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 36: Heat Sink Control

    Heat Sink temp Toff=85(Option)˚C T2=75 (Option)˚C T1=70 (Option)˚C 5 Hz 5 Hz COMP Hz (Option) (Option) frequency frequency frequency Down Down - 35 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 37: Part 4 Test Run

    4. Test Run 1. Check before Test Run.....................37 2. Test Run Flow chart ......................38 3. Test Running ........................39 - 36 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 38: 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. - 37 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 39: Test Run Flow Chart

    Guide Normal • Each indoor unit should be tested. • If the unit has accessory, it should be tested. - 38 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 40: Test Runing

    ❏ 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} - 39 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 41: Part 5 Trouble Shooting Guide

    1. Self-diagnosis Function....................41 2. Pump Down........................43 3. Evacuation ........................44 4. Gas Charging ........................45 5. Cycle Part ........................46 6. Electronic Parts ......................47 - 40 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 42: Self-Diagnosis Function

    Communcation error between in and out Indoor Out-Piping sensor error Differnt mode operation EEPROM Check Sum Error Indoor BLDC Fan Lock - 41 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 Outdoor BLDC Fan Lock Outdoor Fan is not operating 7times ◑ 3times ◑ PFC Fault Error(S/W) Over Current of Outdoor Unit PFC - 42 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 44: 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. - 43 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: 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. - 44 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 46: Gas Charging

    1 minute and then repeat the procedure (pumping down-pin). - 45 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 47: Cycle Part

    2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty. - 46 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 48: 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↑ - 47 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 49 * Check display P.C.B Assembly - Voltage between CN-DISP1 should be DC +5V, - If problem still persists, Replace display PCB - 48 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 Check the electrical wiring diagram of Outdoor side. Check the open or short of connecting wires between Indoor and Outdoor. - 49 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 51: 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 - 50 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 52: 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 - 51 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 53: Troubleshooting Indoor Error

    8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. → Repair or Change the PCB. - 52 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 54 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 - 53 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 3. Check the level of water 4. Check the volt. Of Drain pump power supply. (AC 230V) → Repair or Change the main PCB. - 54 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 56 Press the on/off button or mode change button and matching the indoor unit mode same as the first operated indoor unit - 55 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 2. If the EEPROM value & the Program value are not matched, the Code is Displayed 3. After Checking the connection and Insertion, replace the PCB or Option PCB - 56 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 58 → Check Red line to Black line, Blue line to Black line → The resistance should infinite → replace the motor - 57 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 59: Troubleshooting Outdoor Error

    • 24k/36k 1. In Case of CH53, Check the Connection → L , N at the ter- minal block - 58 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 60 Resistance(Ω) at 20°C Constant Inverter Terminal comp. comp. Ω U-GND 2MΩ 2MΩ V-GND 2MΩ 2MΩ W-GND 2MΩ 2MΩ - 59 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 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. - 60 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 62 Check inverter PCB assembly IPM normality Is inverter PCB assembly → Replace inverter PCB assembly normal? Recheck power and installation condition - 61 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 - Check output the CT Sensor : DC 2.5±0.2V < Input Power Source Check Point > < Main PCB> <CT Sensing Check Point> - 62 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 64 Power connection normal? Inverter PCB assembly CN(L), CN(N) Replace inverter PCB assembly Is Inverter PCB Normal? Recheck power and installation condition - 63 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 < Input Power Source Check Point > < Main PCB> <DC_LINK Sensing Check Point> <DC Link Voltage Check Point> - 64 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 66 LGMV similar as Replace high pressure sensor at manifold gauge? Check pipe is blocked or not and take measure - 65 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 67 2. Check short or not at the connector of high pressure switch (Normal open) < Main PCB : Connection Check Point > < Checking the Press switch > - 66 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 68 1. Check the Input Voltage (L–N ➔ 220V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) < Input Power Source Check Point > - 67 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 69 5. Trouble Shooting < Input Voltage Sensing Check Point > < Inverter PCB> INPUT(V) - 68 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 70 Check inverter PCB assembly IPM normality Is inverter PCB assembly normal? → Replace inverter PCB assembly Recheck power and installation condition - 69 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 71 ③ 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. - 70 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 72 Power connection normal? Inverter PCB assembly CN(L), CN(N) Is Inverter PCB Normal? Replace inverter PCB assembly Recheck power and installation condition - 71 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 73 < Input Power Source Check Point > < Main PCB> <DC_LINK Sensing Check Point> <DC Link Voltage Check Point> - 72 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 74 Check inverter PCB assembly IPM normality Is inverter PCB assembly → Replace inverter PCB assembly normal? Recheck power and installation condition - 73 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 1. Check the install condition for over load. 2. Check the SVC V/V open. 3. Check the leakage of refrigerant. - 74 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 76 1. Check the Input Voltage (L–N ➔ 220V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) < Input Power Source Check Point > - 75 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 77 Is transmission cable Re-connect transmission cable connected correctly? Is MAIN PCB normal? Replace MAIN PCB Replace inverter compressor PCB - 76 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 78 3. If the resistance of the sensor is 0 kΩ or ∞, then sensor is abnormal. If the voltage of the sensor is 0 V or 5Vdc, then sensor is abnormal. Ω - 77 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 79 Max. single indoor unit Model Gross max. capacity capacity A2UW183FA2 A3UW243FA2 A4UW363FA1 A4UW363FA2 Check Point 1. Check the indoor unit capacity. - 78 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 80 Recheck power and installation condition Check Point - Check the EEPROM Check sum & Direction <EEPROM Direction Check Point> <MAIN PCB> - 79 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 81 Check Point - Check the install condition for over load. (Refrigerant, Pipe length, Blocked, …) - 80 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 82 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). PFCM : Measuring resistance between No.19,20 pin - 81 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 83 4. Check the PFC Module No.19, 20 and IPM Module No.24, 25 pin soldering condition. PFCM : Measuring resistance between No.19,20 pin - 82 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 84 2. Voltage vaule should be in 1V ±0.2V. Check voltage betwen 1pin and 4pin of fan motor Fan motor connector Tester <Main PCB> - 83 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 85 Is inverter PCB assembly Check inverter PCB assembly IPM normality normal? → Replace inverter PCB assembly Recheck power and installation condition - 84 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 86 5. Trouble Shooting < Main PCB wiring Check Point > < Input Power Source Check Point > - 85 - Copyright ©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 87 NOVEMBER, 2010 P/NO : MFL63744402...

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