LG LFXS30726 series Service Manual
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LG LFXS30726 series Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODEL : LFXS30726*
COLOR : STAINLESS(ST)

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Summary of Contents for LG LFXS30726 series

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MODEL : LFXS30726* COLOR : STAINLESS(ST)

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ............................... 2 1. SPECIFICATIONS ................................3 2. PARTS IDENTIFICATION ..............................4 3. DISASSEMBLY ................................. 5 REMOVING AND REPLACING REFRIGERATOR DOORS ................5 DOOR ................................6 SUB PCB FOR WORKING DISPENSER ......................7 DOOR ALIGNMENT ............................8 FAN AND FAN MOTOR........................... 8 DEFROST CONTROL ASSEMBLY ........................

  • Page 3: Specifications

    1. SPECIFICATIONS 1-1 LFXS30726* 29.8 cu.ft. ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DOOR DESIGN Side Rounded VEGETABLE TRAY Clear Drawer Type 3 /4 1 /4 1 /4 DIMENSIONS (inches) X 36 X 70 (WXDXH) 29.8cu.ft. COMPRESSOR Linear NET WEIGHT (pounds) 150kg (331lb) EVAPORATOR Fin Tube Type COOLING SYSTEM...

  • Page 4: Parts Identification

    2. PARTS IDENTIFICATION Modular Door Bin Interchangeable bins can be arranged to suit your storage needs. Icemaker Ice Bin Ice Compartment Door - 4 -...

  • Page 5: Disassembly

    3. DISASSEMBLY 3-1 REMOVING AND REPLACING REFRIGERATOR DOORS Removing Refrigerator Door CAUTION: Before you begin, unplug the refrigerator. Remove food and bins from doors. Left Door -FIG. 2 1. Disconnect water supply tube by pushing back on the disconnect ring (3).-FIG. 1 2.

  • Page 6: Door

    3-2 DOOR Door Gasket Replacement 1. Insert gasket into channel Mullion Removal Insert and press gasket into channels at doorliner. 1. Remove 2 screws. 2. Lift mullion up carefully. Mullion Replacement 1. Connect wire harness. 3. Disconnect wire harness. 2. Insert mullion into channel. Insert the mullion into channel at door as shown below.
  • Page 7 - 7 -...

  • Page 8: Door Alignment

    3-4 Door Alignment * Ice Fan Assembly Replacement If the level of refrigerator doors is uneven, follow the 1) Remove the plastic guide for slides on left side by instructions below to align the doors: unscrewing phillips head screws. Turn the leveling legs (CCW) to raise or (CW) to lower the 2) Pull out the cover sensor to disassemble by using tools height of the front of the refrigerator by using flat blade shown in the figure.

  • Page 9: Refrigerator Light (Top)

    3-7 Refrigerator Light (Top) 3-7-2 Refrigerator Light (Side) Unplug Refrigerator, or disconnect power at the circuit 1. Unplug refrigerator power cord from electric outlet. breaker. 2. Put flat screwdriver into sevice hole and remove cover of If necessary, remove top shelf or shelves. refrigerator light.

  • Page 10: Multi Duct

    3-7-3 Cap Duct LED LAMP(Bottom) 3-8 MULTI DUCT 1. Unplug refrigerator power cord from electric outlet. 1. Remove 2 screws and guide rail. 2. Open the refrigerator door to need diassembly. 3. Put flat screwdriver into service hole, remove the cover of cap duct LED LAMP.

  • Page 11: Dispenser

    3-9 DISPENSER 3-11 ICE BUTTON ASSEMBLY 1) Remove the 1 screw holding the lever. 2) Remove the spring from the hook. 3) Push and pull on the tab to remove. 2) Holding the inner side of 1) Pull out the drain the dispenser pull Button Lever forward to remove.

  • Page 12: Icemaker Replacement

    3-14 Icemaker replacement 3-15 CAP DUCT MOTOR REPLACEMENT 1) Remove 3 screws marked in the picture below. 1) Separate the Housing of the Cap Duct Motor. 2) Unscrew 3 screws to disassemble the motor. 2) Grasp the bottom of motor cover assembly and pull it out slowly to remove.

  • Page 13: How To Place Ice Bin In Position

    3-16 HOW TO REMOVE ICE BIN 3-17 HOW TO PLACE ICE BIN IN POSITION 1) Grip the handles, as shown in the picture. 1) Insert the Ice Bin, slightly tilting it to avoid touching the Icemaker. (Especially, Ice-Detecting Sensor) Auto shuto (feeler arm) Note) Before remove ice bin, put on clean golves for 2) Lift the lower part slightly.

  • Page 14: How To Remove And Reinstall The Pullout Drawer

    3-18 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER 3-18-1 Follow Steps to Remove Step 1) Open the freezer door. Step 2) Remove the lower basket. Step 3) Remove the two screws from the guide rails (one Step 4) Removal of the freezer door is done by l ifting clear from each side).
  • Page 15 3-18-2 Follow Steps to Reinstall Step 1) Insert both side of supporter cover tv into Step 2) Assemble a bar and gear ice with screw. connector rails, and then screw them. Push the otherside of the gear to inside of the bar.

  • Page 16: Water Valve Disassembly Method

    3-19 WATER VALVE DISASSEMBLY METHOD 3-20 FAN MOTOR ASSEMBLY AND DISASSMEMBLY METHOD 1) Turn off the water to unit. Remove the waterline from the 1) Remove screws for the Drain Pipe Assembly and the 1 valve. connected to the Motor Cover. 2) Remove cover and 1 screw from the valve.

  • Page 17: Pull Out Drawer

    3-21 PULL OUT DRAWER Top Drawer 1. Use a flat blade screwdriver to push the tab in on the left rail and push the tab on the right rail in with your finger. Once the tabs have been pushed in, you can lift the tray up and out. 2.

  • Page 18: Caution : Sealed System Repair

    CAUTION : Sealed System Repair 3-22 Before making a sealed system repair : Start with the power cord unplugged from the outlet. Plug in the power cord and between 6 and 12 seconds after it has been pugged in, unplug it from the power source. this will allow both sides of the 3 way valve to be opened to allow for proper evacuation.

  • Page 19: Adjustment

    4. ADJUSTMENT 4-1 COMPRESSOR 4-2-3 Compressor protection logic Since linear Comp conducts linear reciprocating motion, 4-1-1 Role we have protection logic for compressor, motor and PCB The compressor intakes low temperature and low pressure as the below. gas from the evaporator of the refrigerator and compresses this gas to high-temperature and high-pressure gas.

  • Page 20: Circuit Diagram

    5. CIRCUIT DIAGRAM - 20 -...

  • Page 21: Troubleshooting

    6. TROUBLESHOOTING - 21 -...
  • Page 22 - 22 -...

  • Page 23: Pcb Picture

    7. PCB Picture 7-1. Main PCB ( P/N : EBR789406) ( P/ P P N / / : EBR789406) 6 CON7 CON201 CON6 CON3 CON2 CON1 CON5 7-2. Display PCB ( P/N : EBR791597) CON802 CON102 CON101 CON3 CON103 - 23 -...
  • Page 24 7-3. Sub PCB - 24 -...
  • Page 25 8. Trouble Shooting 8-1. Freezer Sensor Error (E FS) Symptom Check Point 1. E FS 1. Check f or a loose connection 2. Check Sensor Resistance CON7 CON201 CON6 CON7 CON3 CON2 CON1 CON5 Resistance [Ω] Short CON7 Open pin ~ 18 Other Normal CON7...
  • Page 26 Freezer Sensor Error (E FS) Reconnect or Is the Connector disconnected Check the Sensor resistance. repair the or loose between Main PCB and Is resistance normal? connector sensor? CON7 Check the Temperature and resistance ref er to the table. No problem? CON7 Resistance [Ω] pin ~18...
  • Page 27 2. Refrigerator Sensor Error (E rS) Symptom Check Point 1. E rS 1. Check f or a loose connection 2. Check Sensor Resistance CON7 CON201 CON6 CON7 CON3 CON2 CON1 CON5 Resistance [Ω] Short CON7 Open pin ~ 16 Other Normal CON7 Resistance [Ω]...
  • Page 28 Refrigerator Sensor Error (E rS) Reconnect or Is the Connector disconnected Check the Sensor resistance. repair the or loose between Main PCB and Is resistance normal? connector sensor? CON7 Check the Temperature and resistance ref er to the table. No problem? CON7 Resistance [Ω] pin ~ 16...
  • Page 29 8-3. Icing Sensor Error (E IS) Symptom Check Point 1. E IS 1. Check f or a loose connection 2. Check Sensor Resistance CON7 CON201 CON6 CON5 CON3 CON2 CON1 CON5 Resistance [Ω] Short CON5 Open pin ~ 12 Other Normal CON5 Resistance [Ω]...
  • Page 30 Icing Sensor Error (E IS) Reconnect or Is the Connector disconnected Check the Sensor resistance. repair the or loose between Main PCB and Is resistance normal? connector sensor? CON5 Check the Temperature and resistance ref er to the table. No problem? CON5 Resistance [Ω] pin ~ 12...
  • Page 31 8-4. Defrost Sensor Error (F dS) Symptom Check Point 1. F dS 1. Check f or a loose connection 2. Check Sensor Resistance Defrost Controller CON7 CON201 CON7 CON6 CON3 CON2 CON1 CON5 Resistance [Ω] Short CON7 Open pin ~ 20 Other Normal CON7...
  • Page 32 Defrost Sensor Error (F dS) Reconnect or Is the Connector disconnected Check the Sensor resistance. repair the or loose between Main PCB, Is resistance normal? connector Def rost controller and Sensor? CON7 Check the Temperature and resistance ref er to the table. No problem? CON7 Resistance [Ω]...
  • Page 33 8-5. Defrost Sensor Error (r dS) Symptom Check Point 1. r dS 1. Check f or a loose connection 2. Check Sensor Resistance Defrost Controller CON7 CON201 CON7 CON6 CON3 CON2 CON1 CON5 Resistance [Ω] Short CON7 Open pin ~ 14 Other Normal CON7...
  • Page 34 Defrost Sensor Error (r dS) Reconnect or Is the Connector disconnected Check the Sensor resistance. repair the or loose between Main PCB, Is resistance normal? connector Def rost controller and Sensor? CON7 Check the Temperature and resistance ref er to the table. No problem? CON7 Resistance [Ω]...
  • Page 35 8-6. Defrost Heater Error (F dH) Symptom Check Point 1. F dH 1. Check the door gasket 2. Check the Def rost Heater 3. Check the PCB output voltage CON7 CON7 CON201 CON201 CON3 CON6 CON6 CON3 CON2 CON3 CON2 CON1 CON1 CON5...
  • Page 36 Defrost Heater Error (F dH) Replace Defrost Is the resistance value of defrost Sensor sensor as follow? Resistance is influenced by temperature. Replace the Check the Door gasket . Door gasket Is door gasket damaged? CON7 Resistance [Ω] pin ~ 20 23ºF / 5ºC 32ºF / 0ºC...
  • Page 37 8-7. Defrost Heater Error (r dH) Symptom Check Point 1. r dH 1. Check the door gasket 2. Check the Def rost Heater 3. Check the PCB output voltage Defrost Controller CON7 CON7 CON201 CON201 CON3 CON6 CON6 CON3 CON2 CON3 CON2 CON1...
  • Page 38 Defrost Heater Error (r dH) Replace Defrost Is the resistance value of defrost Sensor sensor as follow? Resistance is influenced by Replace the temperature. Check the Door gasket . Door gasket Is door gasket damaged? Is the Connector Properly Sensor Reconnect connected? CON7...
  • Page 39 8-8. Refrigerator Fan Error (E rF) Symptom Check Point 1. E rF 1. Check the air f low 2. Check the PCB Fan motor voltage Duct CON7 CON201 CON6 CON6 CON3 CON2 CON1 CON5 TEST MODE 1 Voltage [V] CON6 8~12V pin ~ 5 CON6...
  • Page 40 Refrigerator Fan Error (E rF) Reset the unit and Input Test1 Mode. Replace (Push the button 1 time) Check the Fan Motor voltage Main PCB Is Fan Motor voltage 8~12V? TEST MODE 1 Voltage [V] Go to 3 Open the f reezer door and Check CON6 8~12V the air f low.
  • Page 41 8-9. Freezer Fan Error (E FF) Symptom Check Point 1. E FF 1. Check the air f low 2. Check the Fan Motor 3. Check the PCB Fan motor voltage Fan Motor CON7 CON201 CON7 CON6 CON3 CON2 CON1 CON5 TEST MODE 1 Voltage [V] CON7...
  • Page 42 Freezer Fan Error (E FF) Reset the unit and Input Test1 Mode. Replace (Push the button 1 time) Check the Fan Motor voltage Main PCB Is Fan Motor voltage 8~12V? TEST MODE 1 Voltage [V] Go to 3 Open the f reezer door and Check CON7 8~12V the air f low.
  • Page 43 8-10. Icing Fan Error (E IF) Symptom Check Point 1. E IF 1. Check the air f low 2. Check the Connector 3. Check the PCB Fan motor voltage Air Flow Connector CON7 CON201 CON7 CON6 CON3 CON2 CON1 CON5 TEST MODE 1 Voltage [V] CON7...
  • Page 44 Freezer Fan Error (E IF) Reset the unit and Input Test1 Mode. Replace (Push the button 1 time) Check the Fan Motor voltage Main PCB Is Fan Motor voltage 8~12V? TEST MODE 1 Voltage [V] Go to 3 Open the f reezer door and Check CON7 8~12V the air f low.
  • Page 45 8-11. Condenser Fan Error (E CF) Symptom Check Point 1. E CF 1. Check the air f low 2. Check the Connector 2. Check the PCB Fan motor voltage Fan Motor CON7 CON201 CON7 CON6 CON3 CON2 CON1 CON5 TEST MODE 1 Voltage [V] CON7 8~12V...
  • Page 46 Condenser Fan Error (E CF) Reset the unit and Input Test1 Mode. Replace (Push the button 1 time) Check the Fan Motor voltage Main PCB Is Fan Motor voltage 8~12V? TEST MODE 1 Voltage [V] Go to 3 Check the f an rotating. CON7 8~12V Does f an rotate?
  • Page 47 8-12. Communication Error (E CO) Symptom Check Point 1. E CO 1. Check the loose connection 2. Check the Hinge connection CON7 CON201 CON6 CON3 CON2 CON1 CON5 CON101 CON5 Voltage [V] CON101 pin ~ 2 CON101 Not 0V, 5V pin ~ 3 CON101 Not 0V, 5V...
  • Page 48 Communication Error (E CO) Change the Main PCB Check the voltage. Is CON101 2 pin ~ 4 voltage 0V or 5V? Check the loose connection Voltage CON101 CON101 pin ~ 4 0V, 5V Check the Check the voltage. Hinge (loose Is CON101 1 pin ~ 2 connection)
  • Page 49 8-13. Cube mode doesn’t work Symptom Check Point 1. Cube mode 1. Check the loose connection doesn’t work 2. Check the resistance CON1 CON2 Ice Maker Geared Motor Dispenser Motor - 49 -...
  • Page 50 LEVER S/W Voltage [V] Resistance [Ω] Pushing 112~115V Geared Motor 31.1 ~ 42.1 CON2 pin ~ 9.9 ~ 12.1 Dispenser Motor 0~2V B(NEUTRAL) Pushing Pushing 9~12V CON1 pin ~ 0~2V Pushing - 50 -...
  • Page 51 Cube mode doesn't work Replace Geared Motor Check the resistance value. Is Geared Motor resistance 31.1 ~ 42.1Ω? Check the loose connection Geared Motor Change the Check the voltage. (while pushing the lever S/W) Is voltage correct? Resistance [Ω] Geared Motor 31.1 ~ 42.1 CON2 Replace...
  • Page 52 8-14. Crush mode doesn’t work Symptom Check Point 1. Crush mode 1. Check the loose connection doesn’t work 2. Check the resistance CON1 CON2 Ice Maker Geared Motor Dispenser Motor - 52 -...
  • Page 53 LEVER S/W Voltage [V] Resistance [Ω] Pushing 112~115V Geared Motor 31.1 ~ 42.1 CON2 pin ~ Dispenser Motor 9.9 ~ 12.1 0~2V B(NEUTRAL) Pushing Pushing 9~12V CON1 pin ~ 0~2V Pushing - 53 -...
  • Page 54 Crush mode doesn't work Replace Geared Motor Check the resistance value. Is Geared Motor resistance 31.1 ~ 42.1Ω? Check the loose connection Geared Motor Change the Check the voltage. (while pushing the lever S/W) Is voltage correct? Resistance [Ω] Geared Motor 31.1 ~ 42.1 CON2 Replace...
  • Page 55 8-15. Water mode doesn’t work Symptom Check Point 1. Water mode 1. Check the loose connection doesn’t work 2. Check the resistance valve CON2 Water Valve Pilot Valve CON2 LEVER S/W Voltage [V] Pushing 112~115V CON2 pin ~ 0~2V B(NEUTRAL) Pushing Pushing 112~115V...
  • Page 56 Freezer room lamp doesn’t work Explain to Change the The Switch senses if the door is customer LED Lamp Check the LED Lamp voltage open or close. Is voltage 12V? When the door open, lamp On LED Lamp When the door Close, lamp Of f LED Lamp Change the Check the door S/W resistance.
  • Page 57 8-16. Freezer room lamp doesn’t work Symptom Check Point 1. Freezer room lamp 1. Check the f reezer door switch sticky doesn’t work 2. Check the door S/W resistance 3. Check the LED Lamp LED Lamp CON7 LED Lamp CON201 CON6 CON3 CON2...
  • Page 58 8-17. Refrigerator room lamp doesn’t work Symptom Check Point 1. Ref rigerator room 1. Check the Ref rigerator door switch sticky lamp doesn’t work 2. Check the door S/W resistance 3. Check the LED Lamp CON7 CON201 LED Lamp CON6 CON3 CON2 CON1...
  • Page 59 Refrigerator room lamp doesn’t work Explain to Change the The Switch senses if the door is customer LED Lamp Check the LED Lamp voltage open or close. Is voltage 12V? When the door open, lamp On When the door Close, lamp Of f LED Lamp Change the Check the door S/W resistance.
  • Page 60 8-18. Poor cooling in Fresh food section Symptom Check Point 1. Poor cooling in Fresh 1. Check the sensor resistance f ood section 2. Check the air f low 3. Check the air Temperature 4. Check the R-Fan motor voltage CON7 CON201 CON6...
  • Page 61 Poor cooling in Fresh food section Check the Compressor Check the air temperature. and sealed Is it cold? system Check the sensor resistance. CON7 Go to 7 CON7 Replace Resistance [Ω] Check the Fan Motor voltage Main PCB pin ~ 14 Is Fan Motor voltage 8~12V? 23ºF / -5ºC 32ºF / 0ºC...
  • Page 62 8-19. Poor cooling in Freezer compartment Symptom Check Point 1. Poor cooling in 1. Check the sensor resistance Freezer compartment 2. Check the air f low 3. Check the air Temperature 4.Check the Fan motor sticky 4. Check the Fan motor voltage CON7 CON201 Duct...
  • Page 63 Poor cooling in Freezer compartment Check the Compressor Check the air temperature. and sealed Is it cold? system Check the sensor resistance. Change the CON7 Resistance [Ω] Fan motor Check the Fan motor. pin ~ 20 Rotate f an using hand. -22ºF / -30ºC It f eel sticky? -13ºF / -25ºC...
  • Page 64 Replace Check the Fan Motor voltage Main PCB Is Fan Motor voltage 8~12V? TEST MODE 1 Voltage [V] CON7 8~12V pin ~ 12 Change the Check the Fan Motor voltage motor Is Fan Feed Back voltage 1~5V? TEST MODE 1 Voltage [V] CON7 Not 0V, 5V...

  • Page 65: Reference

    9. Reference 9. TEST MODE and Removing TPA 1. How to make TEST MODE If you push the test button on the Main PCB, the refrigerator will be enter the TEST MODE. * 1 time : Comp / Damper / All FAN on (All things displayed) Refrigerator Freezer...
  • Page 66 9-2 TEMPERATRUE CHART - FREEZER AND ICING SENSOR TEMP RESISTANCE VOLTAGE -39°F (-40°C) 4.09 V 73.29 -30°F (-35°C) 3.84 V 53.63 -30°F (-21°C) 3.55 V 39.66 -13°F (-25°C) 3.23 V 29.62 -4°F (-20°C) 2.89 V 22.33 5°F (-15°C) 2.56 V 16.99 14°F (-10°C) 2.23 V...
  • Page 67 9-3 TEMPERATRUE CHART - REFRIGERATOR AND DEFROST SENSOR TEMP RESISTANCE VOLTAGE -39°F (-40°C) 4.48 V 225.1 -30°F (-35°C) 4.33 V 169.8 -30°F (-21°C) 4.16 V 129.3 -13°F (-25°C) 3.95 V 99.30 -4°F (-20°C) 3.734 V 76.96 5°F (-15°C) 3.487 V 60.13 14°F (-10°C) 3.22 V...

  • Page 68: Component Testing Information

    10. COMPONENT TESTING INFORMATION 10-1 Defrost Controller Assembly Function The controller assembly is made up of two different kinds of parts. The fuse and the sensor. To determine if these parts are defective, check for resistance. The fuse will cut power to the defrost heater at very high temperatures.
  • Page 69 10-2 Sheath Heater (Freezer Room) Function Sheath heater is the part for defrost. All heating wire is connected to only one line. So we can decide part is defective or not when we check the resistance. How to Measure (1) (2) Set a ohmmeter connect to The housing pins.
  • Page 70 10-2 Sheath Heater (Freezer Room) Function Sheath heater is the part for defrost. All heating wire is connected to only one line. So we can decide part is defective or not when we check the resistance. How to Measure Set a ohmmeter connect to The housing pins. Measure the pins connected to Sheath Heater.
  • Page 71 10-3 Sheath Heater (Refrigerator Room) Function Sheath heater is the part for defrost. All heating wire is connected to only one line. So we can decide part is defective or not when we check the resistance. How to Measure Set a ohmmeter connect to The housing pins. Measure the pins connected to Sheath Heater.

  • Page 72: Door Switch

    10-4 Door Switch 10-4-1 Door Switch,R Check Voltage between pin 13 and 14 disconnection CON5 1.Check Reed S/W 2.Check Harness disconnection 3.If No.1,2 ok ,change PCB Check the Reed S/W resistance -.No Magnet Magnet Center Magnet Center Switch Center Switch Center Good position Bad position -.Magnet Near the Switch...
  • Page 73 Push Hook Push Hook Push second Push first - 73 -...
  • Page 74 10-4-2 Door Switch,F The Switch senses if the door is open or close. .When the door open, lamp On .When the door Close, lamp Off close Door and check the lamp Through the gap Check Voltage between pin 21 and 22 disconnection CON7 1.Check Reed S/W...
  • Page 75 Push First push Second push - 75 -...
  • Page 76 10-5 Dispenser DC Motor Function - Dispenser DC Motor : When customer push the dispenser button, Pull duct door and abstract from ice bank. How to Measure Dispensor DC Motor Standard Dispenser DC Motor Test Points Result (1) to (2) 9.9 ~ 12.1 - 76 -...
  • Page 77 10-6 AC Motor ASSEMBLY Function The motor in the door pushed the ice into the dispenser. How to < In-door Motor > < In-door Motor > Measure Separate the Separate the housing. housing. Measure the Measure the resistance between resistance between (1) and (2) (1) and (3) Check the resistance between connectors (In-door motor 1, 2) and...
  • Page 78 10-7 Damper Function The damper supplies cold air from the freezer to the chill room using the damper plate. The chill room is colder when the damper plate is open. When the damper is closed the chill rooms temperature will rise. How to Measure <...
  • Page 79 10-8 Lamp Socket Function The lamp socket connect cover lamp assembly to lamp. The lamp socket fix lamp and unite lamp and cover lamp assembly. The lamp socket supply electric source to lamp also. How to Measure Check the resistance between connector of housing and connector of lamp socket. It means check whether or not applying an electric current.
  • Page 80 10-9 Flow Sensor Function Flow Sensor (in machine room) Count the water quantity from city water to water filter in refrigerator How to Measure Flow Sensor (in machine room) Standard Test Points Result Red wire to Black wire 4 ~ 30 - 80 -...

  • Page 81: Compressor Troubleshooting

    11. Compressor Troubleshooting PCB Check (Simplify) Protection Logic TEST 1 Mode A-inverter Con201 Time>30sec Power Off Power On PCB OK Disconnect & V≒200 Replace Driver PCB Check Voltage about 200V past 30second after turn on Test Mode Comp Ref. Display & sound Refer FLB075(A-Inverter) TEST1...
  • Page 82 11-1 Check A - There is PC Board located in the PCB case. The control driver is PC board for the compressor. - This step shows the source voltage of the driver PC board. Step1. Open PCB Cover Step2. Check Driver PCB LED Lamp * Driver PCB located in machine room.
  • Page 83 IPM Output check - Measure the voltage between the POWER and COMM pins of the connector as shown below. Check to make sure compressor is receiving voltage from IPM - In order to determine whether the compressor is operating normally, check the output voltage during the refrigeration cycle.
  • Page 84 11-2 Check B B1. LED blinks once, then repeats (FCT0 Fault: A-Inverter) Protection Logic Blink OFF Blink OFF - Purpose: Detecting motor current and voltage error - Check voltage at point A (Motor Voltage), point B (Motor Current) and Point C (Capacitor Voltage) when compressor is off.
  • Page 85 B3. LED blinks three times, then repeats (Stroke Trip) Protection Logic Blink Blink Blink Blink Blink Blink - Purpose : Prevent over voltage and current detecting connecting error. - Cause : -.Connecting error of PCB and Comp, Capacitor harness -. Comp insulation damage. - Logic : Compressor is forced off and tries to restart within 40 seconds.
  • Page 86 B4. LED blinks five times, then repeats (Locked Piston: A & E Inverters) Protection Logic Blink Blink Blink Blink Blink OFF - Purpose: To detect locked piston - Cause: Lack of oil to the cylinder, cylinder or piston damaged and or restricted discharge. A Locked Piston can also be caused by foreign materials inside the compressor.
  • Page 87 B6. LED blinks seven times, then repeats (IPM Fault: A & E Inverters) Blink Blink Blink Blink Blink Blink Blink OFF - Purpose: Prevent high current due to IPM Short - Cause: Damaged IPM (Dead Short) - Test for a dead short at Point A with a VOM. - Logic: Compressor is forced off and tries to restart in 20 seconds.
  • Page 88 B7. LED Blinks eight times, then repeats (Communication Error) Blink Blink Blink Blink Blink Blink Blink Blink - Purpose: To detect Set control Micom and communication error - Cause : Communication Error - Logic : LED blink. (Compressor runs reference value before occuring communication Error) 1.
  • Page 89 11-3 Check C C1. Harness Connection Check Check Process C2. Capacitor Specifications C3. Compressor Check - Step 1. Power off. Step 2. Check capacitor spec. (table1). Step3. Check resistance of point A Step 4. Check wire harness (INF ohm). Step 5. Check resistance at point B. Step 6. Point D. Check Check Harness...
  • Page 90 11-4 Check D D1. Activate Protection logic Cycle check with protection logic - We have to check Condenser fan and Freezer fan before performing Check D - Locked Piston, Current trip and stroke trip can be activated by other problems then the driver or compressor. →...
  • Page 91 Compressor Troubleshooting WARNING HIGH VOLTAGE Step 1) Open PCB cover Step 2) Check for blinking frequency of LED and PCB LED Lamp When compressor is normal, it does not blink : Refer to the next page to find out what actions to take according to how many times LED blink - 91 -...
  • Page 92 LED operating condition Cause Service guideline 1. Please check, Whether connector of PCB Parts compressor is attached defect or rightly or not. after LED two - time repetiton (Stroke Trip) Compress power off 2. After the first action, Connector You check on normal miss operation of - off -...
  • Page 93 11-5 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY • Is the power cord unplugged from the outlet? • Plug into the outlet. No Cooling. • Check if the power switch is set to OFF. • Set the switch to ON. •...
  • Page 94 11-6 REFRIGERATION CYCLE Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE OF THE CAUSE REMARKS THE UNIT EVAPORATOR COMPRESSOR PARTIAL Freezer Low flowing sound of A little higher than • Refrigerant level is low due LEAKAGE compartment and Refrigerant is heard ambient to a leak.
  • Page 95 11-6-2 SEALED SYSTEM DIAGNOSIS “Not Cooling” Complaint All components operating, No airflow problems, Not frosted up as a defrost problem problem has been isolated to sealed system area Frost Partial None Pattern? Equalization Equalization Test Test Very Fast Very Slow Very Slow Very Fast Fast...
  • Page 96 12. ICEMAKER OPERATING METHOD AND TROUBLE SHOOTING 12-1 Icemaker’s Basic Operating Method Power On Power On • Adjusts EJECTOR to Start Position with power on. Start Position Icemaking • Walls until water becomes cold after starting the Mode icemaking operation. Full Ice •...
  • Page 97 12-2 Trouble Shooting Ice & Water system Issues 12-3-1 Icemaker not making ice or not making enough ice (Environmental Diagnosis) Icemaker can’t make ices itself. Basically, water, temperature and time are needed. - Water : If no Water, then no Ice. - Temperature : The compartment, where the icemaker is located, has to be at least 1°F so that icemaker dumps ices to the bin.

  • Page 98: Description Of Function & Circuit Of Micom

    13. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM - 98 -...
  • Page 99 - 99 -...
  • Page 100 13-1-9 CONTROL OF FREEZER FAN MOTOR 1. Freezer fan motor has high and standar speed. 2. When refrigerator is overloaded, fan motor runs in high speed as powered-up Standard speeds is used for general purposes. 3. To improve cooling speed, the RPM of freezer fan motor changs from normal speed to high. 13-1-10 Cooling Fan Motor 1.
  • Page 101 13-1-15 Defrosting (removing frost) 1. Defrosting starts each time the COMPRESSOR running time Betwee 7~50 hours. 2. Defrosting stops if the sensor temperature reaches 41°F(5°C) or more. If the sensor doesn’t reach 41°F(5°C) in 1 hours, the defrost mode is malfunctioning. (Refer to the defect diagnosis function) 3.
  • Page 102 14. EXPLODED VIEW & REPLACEMENT PARTS LIST CASE PARTS CAUTION : Use the part number to order part, not the position number. 603C 503E 603E 626A 624E 207B 624G 402A 503D 624C 500P 409D 158A 103B 610F 271B 103A 207A 282G 402A 406D...
  • Page 103 FREEZER PARTS CAUTION: Use the part number to order part, not the position number. 145G 145C 145J 145K 131A 249M 136C 136B 133C 145F 249L 132Q 145M 136E 134A 133C 145J 145H 132P 237C 136A...
  • Page 104 REFRIGERATOR PARTS CAUTION: Use the part number to order part, not the position number. 141H 142B 141A 143A 142A 142D 141F 141B 141H 141H 141A 141A 141F 141B 141F 141B 255A 255B 154D 177C 255A 132P 177E 161B 161C 177D 133E 161A 133E...
  • Page 105 DOOR PARTS CAUTION: Use the part number to order part, not the position number. 205F 500C 180A 241A 241C 231B 233B 233A 231A 241K 212G 235A 241B 241K 241E 241K 241E 312B 205E 243D 243C 262C 243A 262C 244A 244A 624A 405M 262E...
  • Page 106 DISPENSER PARTS CAUTION: Use the part number to order part, not the position number. 276A 276G 276F 276I 405A 276B 275A 278C 279A 278D 279K 402E 402C 279L 501D 279B 281A 501A 279C...
  • Page 107 VALVE & WATER TUBE PARTS CAUTION: Use the part number to order part, not the position number. 617A 625A 616G 616G 623B 616J 623B 616J 627B 603C 627A 619A 603B...
  • Page 108 ICE MAKER & ICE BIN PARTS CAUTION: Use the part number to order part, not the position number. 630J 630J 612A 630F 630B 630C 600A 611A 607A 630A 630H 630D 606A 630E 630Q 630G...
  • Page 109 P/No. MFL68488601 SEP., 2014 Printed in Korea...

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