LG LFXS29766 Series Service Manual
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LG LFXS29766 Series Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
COLOR : STAINLESS(ST)
MODEL : LFXS29766*

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Summary of Contents for LG LFXS29766 Series

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. COLOR : STAINLESS(ST) MODEL : LFXS29766*...

  • 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 ................................7 DOOR ALIGNMENT ............................7 FAN AND FAN MOTOR ..........................7 DEFROST CONTROL ASSEMBLY .......................

  • Page 3: Specifications

    1. SPECIFICATIONS 1-1 LFXS29766* 28.5cu.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) 28.5cu.ft COMPRESSOR Linear NET WEIGhT (pounds) 155kg (342lb) EVAPORATOR Fin Tube Type COOLING SYSTEM...

  • Page 4: Parts Identification

    2. PARTS IDENTIFICATION LED interior lamps The interior lamps light up the inside of the refrigerator. Water filter The water filter purifies water. NOTE The filter should be replaced every 6 months. Please refer to Replacing the filter ¡£ ¡£ in this manual for details.

  • 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.
  • 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 SUB PCB FOR WORKING DISPENSER 1) Remove 3 screws marked in the picture below. 1) Disconnect the wire harness. 2) Remove 1 screw from PCB and replace with new PCB. 2) Grasp the bottom of motor cover assembly and pull it out slowly to remove.

  • Page 13: Cap Duct Motor Replacement

    3-16 CAP DUCT MOTOR REPLACEMENT 1) Separate the housing of the Cap Duct Motor. 2) Unscrew 3 screws to disassemble the motor. 3) When replacing the motor, check the position of the door duct and the link for proper fit. Duct Door Link Cap Duct Motor...

  • Page 14: How To Remove A Ice Bin

    3-17 HOW TO REMOVE ICE BIN 3-18 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) Note) Before remove ice bin, put on clean golves for 2) Lift the lower part slightly.

  • Page 15: How To Remove And Reinstall The Pullout Drawer

    3-19 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER 3-19-1 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 of the rail support.
  • Page 16 3-19-2 Follow Steps to Reinstall Step 1) Insert both side of supporter cover tv into connector Step 2) Assemble a bar and gear ice with screw. rails, and then screw them. Push the otherside of the gear to inside of the bar.

  • Page 17: Water Valve Disassembly Method

    3-20 WATER VALVE DISASSEMBLY METHOD 3-21 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 18: Pull Out Drawer

    3-22 PULL OUT DRAWER Top Drawer 1. To remove the Top drawer. Pull the drawer out to full extension. Lift the front of the drawer up, then pull it straight out. 2. To install, slightly tilt up the front and insert the drawer into the frame and push it back into push it back place. 3-23 CAUTION : Sealed System Repair Before making a sealed system repair : Start with the power cord unplugged from the outlet.
  • Page 19 HOW TO REMOVE AND REINSTALL THE HOMEBAR 3-24 3-24-1 CASE ASSEMBLY, HOME BAR 3-24-2 DOOR BASKET OF HOME BAR DOOR The home Bar is removable for easy cleaning and The Door Baskets are removable for easy cleaning and adjustment. adjustment. 1.
  • Page 20 3-24-4 COVER FRONT The Cover Front is removable for easy cleaning and adjustment. 1. To remove the Cover Front, simply lifts the basket doorr up and pulls slopingly out. 2. Remove two screws of The Cover Front and pull slopingly straight out. NOTE : To replace the Cover Front and basket door, Slide them in above desired support and push down until them snaps into place.
  • Page 21 3-26 HOW TO REMOVE AND REINSTALL THE DOOR FOAM ASSEMBLY, REFRIGERATOR 1. Remove the Screw of Right hinge Cover. 2. Remove two Wire connectors. 3. Rotate the hinge lever clockwise. 4. Separate the home Bar. 5. Pull ThE DOOR FOAM ASSEMBLY, REFRIGERATOR up and out.
  • Page 22 3-27 HOW TO REMOVE FRAME DOOR SWITCH OF DOOR FOAM 1. Remove screws on hinge assebmbly, Upper 2. Separate the Cap,decor on the frame door. 3. Press the hook of door switch, 4. Remove a wire connector for change. Then pushes it outward. - 22 -...
  • Page 23 3-28 HOW TO REMOVE THE HOME BAR DOOR. 1. Remove the screw located on the top of hinge. 2. Remove the cap hinge(upper) Cap hinge(Upper) 3. Remove the bar by pushing it up from the 4. Pull out the bar thought the top hinge. bottom through the SVC hole (bottom hinge).

  • Page 24: 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 25: Circuit Diagram

    5. CIRCUIT DIAGRAM - 25 -...

  • Page 26: Troubleshooting

    6. TROUBLESHOOTING 6-1 Error Code Summary WARNING: When checking Resistance values, make sure to turn off the power, and wait for the voltage to discharge. NOTE) Within 3 hours after the error : Press the Ice Plus button and Freezer button simultaneously All errors except for “E rt”, “E SS”, “E IS(except for icing Sensor)”, “E gF”, “E It”, E hS”, “E Id”, “E IU”...

  • Page 27: Pcb Picture

    7. PCB Picture 7-1. Main PCB ( P/N : EBR78940502) ( P/N : EBR78940502) CON7 CON8 CON201 CON203 CON6 CON3 CON2 CON5 CON1 7-2. Display PCB ( P/N : EBR79159704) CON102 CON802 CON101 CON3 CON103 - 27 -...
  • Page 28 7-3. Sub PCB ( P/N : EBR76468401) - 28 -...
  • Page 29 8. Trouble Shooting 8-1. Freezer Sensor Error (Er FS) Symptom Check Point 1. Er FS 1. Check f or a loose connection 2. Check Sensor Resistance CON7 CON8 CON201 CON7 CON203 CON6 CON3 CON2 CON5 CON1 Resistance [Ω] Short CON7 Open pin &...
  • Page 30 Freezer Sensor Error (Er 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 31 8-2. Refrigerator Sensor Error (Er rS) Symptom Check Point 1. Er rS 1. Check for a loose connection 2. Check Sensor Resistance CON7 CON8 CON201 CON7 CON203 CON6 CON3 CON2 CON5 CON1 Resistance [Ω] Short CON7 Open pin &16 Other Normal CON7 Resistance [Ω]...
  • Page 32 Refrigerator Sensor Error (Er 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&...
  • Page 33 8-3. Icing Sensor Error (Er IS) Symptom Check Point 1. Er IS 1. Check f or a loose connection 2. Check Sensor Resistance CON7 CON8 CON5 CON201 CON203 CON6 CON3 CON2 CON5 CON1 Resistance [Ω] Short CON5 Open pin &12 Other Normal CON5...
  • Page 34 Icing Sensor Error (Er 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 35 8-4. Defrost Sensor Error (F dS) Symptom Check Point 1. F dS 1. Check f or a loose connection 2. Check Sensor Resistance CON7 CON8 CON201 CON7 CON203 CON6 CON3 CON2 CON5 CON1 Resistance [Ω] Short CON7 Open pin & 20 Other Normal CON7...
  • Page 36 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 37 8-5. Defrost Heater Error (F dH) Symptom Check Point 1. F dH 1. Check the door gasket 2. Check Defrost Heater 3. Check the PCB output voltage CON7 CON8 CON201 CON3 CON203 CON6 CON3 CON2 CON5 CON1 Part Resistance [Ω] FUSE-M Def rost Heater 35~40...
  • Page 38 Defrost Heater Error (F dH) Input Test 3 Mode (Push the button 3 times) Replace the Replace Check the Door gasket . Check the Heater Voltage. Door gasket Main PCB Is door gasket damaged? Is voltage 112~116V? Change the TEST MODE 3 Voltage [V] source Is the input voltagte 112~116V?
  • Page 39 Input Test 1 Mode Reconnect Reconnect (Push the button 1 times) Is the connector properly Check the heater resistance. connected? is resistance 35~40 ? Voltage [V] TEST MODE 1 CON3 35~40 pin & 10 Is the resistance value of defrost Replace Change sensor as follow?
  • Page 40 8-6. Freezer Fan Error (Er FF) Symptom Check Point 1. Er FF 1. Check the air f low 2. Check the Fan Motor 2. Check the PCB Fan motor voltage Fan Motor CON7 CON8 CON201 CON203 CON7 CON6 CON3 CON2 CON5 CON1 TEST MODE 1...
  • Page 41 Freezer Fan Error (Er 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 11.4~12.6V? TEST MODE 1 Voltage [V] CON7 11.4~12.6V pin & 12 Go to 3 Open the f reezer door and Check the air f low.
  • Page 42 8-7. Icing Fan Error (Er IF) Symptom Check Point 1. Er IF 1. Check the air f low 2. Check the Connector 2. Check the PCB Fan motor voltage Air Flow Connector CON7 CON8 CON201 CON7 CON203 CON6 CON3 CON2 CON5 CON1 TEST MODE 1...
  • Page 43 Freezer Fan Error (Er IF) Reset the unit and Replace Input Test1 Mode. Check the Fan Motor voltage (Push the button 1 time) Main PCB Is Fan Motor voltage 11.4~12.6V? TEST MODE 1 Voltage [V] CON7 11.4~12.6V pin & 5 Go to 3 Open the f reezer door and Check the air f low.
  • Page 44 8-8. Condenser Fan Error (Er CF) Symptom Check Point 1. Er CF 1. Check the air f low 2. Check the Connector 2. Check the PCB Fan motor voltage Fan Motor CON7 CON8 CON201 CON203 CON6 CON3 CON2 CON5 CON1 TEST MODE 1 Voltage [V] CON7...
  • Page 45 Condenser Fan Error (Er 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 11.4~12.6V? TEST MODE 1 Voltage [V] CON7 11.4~12.6V pin & 6 Go to 3 Check the f an rotating.
  • Page 46 8-9. Communication Error (Er CO) Symptom Check Point 1. Er CO 1. Check the loose connection 2. Check the Hinge connection CON7 CON8 CON201 CON203 CON6 CON3 CON2 CON5 CON5 CON1 CON101 Voltage [V] CON101 11.4~12.6V pin & 7 CON101 Not 0V, 5V pin &...
  • Page 47 Communication Error (Er CO) Change the Main PCB Check the voltage. Is CON101 4 pin & 6 voltage 0V or 5V? CON101 Check the loose connection Voltage CON101 pin & 6 0V, 5V Check the Check the voltage. Hinge (loose Is CON101 4 pin &...
  • Page 48 8-10. 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 - 48 -...
  • Page 49 8-10. Cube mode doesn’t work 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 - 49 -...
  • Page 50 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 51 8-11. Crush 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 - 51 -...
  • Page 52 8-11. Crush mode doesn’t work 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 - 52 -...
  • Page 53 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 54 8-12. 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 55 Water mode doesn't work Replace Check the loose connection Check the resistance value. P/ Valve Is Pilot Valve resistance 360~420Ω? Change the Check the voltage. (while pushing the lever S/W) Is voltage correct? Pilot Valve Resistance [Ω] Pilot Valve 360~420 CON2 LEVER S/W Voltage [V]...
  • Page 56 8-13. 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 CON8 LED Lamp CON201 CON203 CON6...
  • Page 57 Freezer room lamp doesn’t work Change the Change the Check the Freezer door switch. Door S/W LED Lamp Check the LED Lamp voltage Does it f eel sticky? Is voltage 11.4~12.6V? LED Lamp LED Lamp Change the Check the door S/W resistance. Door S/W Is it correct compared with table? Change the...
  • Page 58 8-14. 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 CON8 CON201 LED Lamp CON203 CON6 CON3...
  • Page 59 Refrigerator room lamp doesn’t work Change the Change the Check the Ref rigerator door switch. Door S/W LED Lamp Check the LED Lamp voltage Does it f eel sticky? Is voltage 11.4~12.6V? LED Lamp Change the Check the door S/W resistance. Door S/W Is it correct compared with table? Change the...
  • Page 60 8-15. 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-Damper voltage 5. Check the F-Fan CON7 CON8 CON201...
  • 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. Go to 9 CON7 CON7 Change Resistance [Ω] Check the Damper Resistance Damper pin & 16 Is it correct compared with table? 23ºF / -5ºC 32ºF / 0ºC 41ºF / 5ºC...
  • Page 62 Replace Check the Fan Motor voltage Main PCB Is Fan Motor voltage 11.4~12.6V? TEST MODE 1 Voltage [V] CON7 11.4~12.6V pin & 12 Change the Check the Fan Motor voltage motor Is Fan Feed Back voltage 0V, 5V? TEST MODE 1 Voltage [V] CON7 Not 0V, 5V...
  • Page 63 8-16. 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 CON8 CON201...
  • Page 64 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 & 18 Rotate f an using hand. -22ºF / -30ºC It f eel sticky? -13ºF / -25ºC...
  • Page 65 Replace Check the Fan Motor voltage Main PCB Is Fan Motor voltage 11.4~12.6V? TEST MODE 1 Voltage [V] CON7 11.4~12.6V pin &12 Change the Check the Fan Motor voltage motor Is Fan Feed Back voltage 0V, 5V? TEST MODE 1 Voltage [V] CON7 Not 0V, 5V...

  • Page 66: Reference

    9. Reference 9-1 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 67 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 ㏀...
  • Page 68 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 ㏀...
  • Page 69 9-4 How to check the Fan-Error After sending a signal to the fan, the MICOM checks the BLDC fan motor s lock status. If there is no feedback signal from the BLDC fan, the fan motor stops for 10 seconds and then is powered again for 15 seconds.

  • Page 70: 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 71 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 72 10-3 Door Switch 10-3-1 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 10-3-2 Door Switch,F Check Voltage between pin 21 and 22 disconnection CON7 1.Check Reed S/W 2.Check Harness disconnection 3.If No.1,2 ok ,change PCB Check the Reed S/W resistance -.Magnet must be center of Switch -.No Magnet Magnet Center Magnet Center Switch Center Switch Center Good position...
  • Page 75 Push First push Second push - 75 -...
  • Page 76 10-3-3 H/Bar Door Switch 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 -.Resistance &...
  • Page 77 Checking Flow Result & SVC Action Change Reed S/W - . Remove screw(8EA) - . Disassemble R/L Door - . Remove screw(1EA) - . Disassemble Cap Deco - . Push Hook and Disassemble Housing Push - . Check the Reed S/W resistance and if it is NG, Change it (Number 3) - .
  • Page 78 10-5 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 79 10-6 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 80 10-7 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 81 10-8 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 ㏀ - 81 -...

  • Page 82: 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¡Ö200 Replace Driver PCB Test Button Check Voltage about 200V past 30second after turn on Test Mode Comp Ref.
  • Page 83 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 back plate cover behind the refrigerator.
  • Page 84 11-2 Check B B1. LED blinks once, then repeats (FCT0 Fault) 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 B5. LED blinks six times, then repeats (Current Trip: A & E-Inverters) Protection Logic Blink Blink Blink Blink Blink Blink - Purpose: Prevent over-current (overload protect) - Cause: Ambient temperature is high (over 43°C) and/or refrigerator’s condenser air movement is restricted. - Condenser Fan is stopped, restricted discharge line, compressor is damaged, or IPM device is defective.
  • Page 87 B7. LED Blink 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 communicationError) Protection Blink 8 times 1.
  • Page 88 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 89 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 90 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 - 90 -...
  • Page 91 LED operating condition Cause Service guideline 1. Please check, Whether connector of compressor is attached PCB Parts rightly or not. after defect or LED two - time repetiton (Stroke Trip) power off Compressor 2. After the first action, Connector You check on normal miss operation of - off -...
  • Page 92 11-5 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY No Cooling. • Is the power cord unplugged from the outlet? • Plug into the outlet. • Check if the power switch is set to OFF. • Set the switch to ON. • Check if the fuse of the power switch is shorted. • Replace the fuse. • Measure the voltage of the power outlet. • If the voltage is low, correct the wiring. Cools poorly. • Check if the unit is placed too close to the wall. • Place the unit about 4 inches (10 cm) from • Check if the unit is placed too close to the stove, the wall. gas cooker, or in direct sunlight. • Place the unit away from these heat sources.
  • Page 93 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. Refrigerator don't and frost forms in temperature.
  • Page 94 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 95 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 • Check if the ice bin is full. Check • Runs MOTOR to drop ice from the tray into the ICE Full Ice? BIN. Harvest • Performs Ice Making Mode afer supplying water by Mode operating the SOLENOID in ICE VALVE.
  • Page 96 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 97: Icemaker (Freezer Room) Operating Method And Trouble Shooting

    13. ICE MAKER (Freezer Room) OPERATING METHOD AND TROUBLE SHOOTING 13-1 Working Principles 14-1-1 Ice Maker Working Principles Power Input · Level Ice Maker Cube Mould for “Initial Control” Initial Control after power is input. Ice Making ·Wait until the water in the cube mould is frozen Control after ice maker starts operation.
  • Page 98 13-2 Function of Ice Maker 13-2-1 Initial Control Function 1. When power is initially applied or reapplied after power cut, it detects level of ice maker cube mould after completion of MICOM initialization. The detecting lever moves up and down. 2. The level of ice maker cube mould is judged by output signal, high and low signal, of Hall IC. Make the cube mould to be horizontal by rotating ice ejection motor in normal or reverse direction.
  • Page 99 13-2-4 Ice Ejection Control Function 1. This is to eject ice from ice maker cube mould after ice making is completed. 2. If Hall IC signal is on within 3.6 seconds after ice ejection motor rotates in normal direction, it does not proceed ice ejection but waits. If the ice bucket is full, ice ejection motor rotates in normal direction in every hour to check the condition of ice bucket. If the ice bucket is not full, the water supply control starts after completion of ice ejection control. If the ice bucket is full, ice ejection motor rotates in reverse direction and sops under ice making or waiting conditions. 3. If ice bucket is not full, ice ejection starts. The cube mould tilts to the maximum and ice is separated from the mould and ice checking lever raises. 4. Ice ejection motor stops for 1 second if Hall IC signal changes from OFF (low) to ON (high) after 3.6 seconds when ice ejection motor rotates in normal direction. If there is no change in Hall IC signals within 1 minute after ice ejection motor operates, ice ejection motor stops as ice ejection motor or hall IC is out of order. 5. If ice ejection motor or Hall IC is abnormal, ice ejection motor rotates in normal direction to exercise initial operation. It resets the ice maker if ice ejection motor or Hall IC is normal. 6. The mould stops for 1 second at maximum tilted conditions. 7. The mould returns to horizontal conditions as ice ejection motor rotates in reverse direction. 8. When the mould becomes horizontal, the cycle starts to repeat: Water Supply ...
  • Page 100 13-2-5 Test Function 1. It is to force the operation during operation test, service, and cleaning. The test switch is mounted under the automatic ice maker. The test function starts when the test switch is pressed for more than 0.5 second. 2. Test button does not work during ice ejection and water supply. It works when it is in the horizontal conditions. If mould is full of ice during test function operation, ice ejection control and water supply control do not work.

  • Page 101: Description Of Function & Circuit Of Micom

    14. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM - 101 -...
  • Page 102 - 102 -...
  • Page 103 14-1-9 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. 14-1-10 Cooling Fan Motor 1. The cooling fan is switched ON and OFF in conjunction with the compressor.
  • Page 104 14-1-15 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 105 15. EXPLODED VIEW & REPLACEMENT PARTS LIST CASE PARTS CAUTION : Use the part number to order part, not the position number. 626A 624E 207B 624G 158C 402A 624C 500P 503D 409D 603C 158A 610F 103B 271B 103A 207A 282G 402A 406D 610D...
  • Page 106 FREEZER PARTS CAUTION: Use the part number to order part, not the position number. 145C 243J 133B 131A 136B 136C 133C 205D 145F 243J 170B 132P 150B 150D 134B 150H 150C 136A 253D...
  • Page 107 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 141D 154A 161B 151C 161C 151A 151B 161C 161A 146E 162B 145D 162A...
  • Page 108 DOOR PARTS CAUTION: Use the part number to order part, not the position number. 207D 250W 232A 281K 312F 241B 500C 231B 233B 312G 241B 241K 281B 235A 207C 146F 281K 312E 241K 241A 624A 405M 241K 262E 409I 241J 233A 312B 402B...
  • Page 109 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 110 VALVE & WATER TUBE PARTS CAUTION: Use the part number to order part, not the position number. 617A 625A 616G 625A 623B 616D 616J 616F 627A 616J 616E 603C 623A 616S 616R 627A 619F 619A 603B 619J...
  • Page 111 ICE MAKER & ICE BIN PARTS CAUTION: Use the part number to order part, not the position number. 630J 630J 612A 630F 630B 630C 611A 600A 607A 630A 630H 630D 606A 630E 630Q 630G Freezer Room 600F 600B...
  • Page 112 P/No. MFL68488627 JUN., 2015 Printed in Korea...

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