LG LFXS29626 Series Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Refrigerator
  5. LFXS29626
  6. Service manual

LG LFXS29626 Series Service Manual

Hide thumbs Also See for LFXS29626 Series:
Table of Contents

Advertisement

Quick Links

REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODEL : LFXS29626*
COLOR : STAINLESS(ST)
SMOOTH BLACK(SB)
SUPER WHITE(SW)

Advertisement

Table of Contents
loading

Related Manuals for LG LFXS29626 Series

Summary of Contents for LG LFXS29626 Series

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. COLOR : STAINLESS(ST) SMOOTH BLACK(SB) SUPER WHITE(SW) MODEL : LFXS29626*...

  • 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 LFXS29626* 28.7cu.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) 28.7cu.ft COMPRESSOR Linear NET WEIGHT (pounds) 145kg (320lb) EVAPORATOR Fin Tube Type COOLING SYSTEM Fan Cooling...

  • Page 4: Parts Identification

    2. PARTS IDENTIFICATION LED interior lamps The interior lamps light up the inside of the refrigerator. Dairy product bin Water filter The dairy product bin is The water filter purifies used to preserve dairy water. products. NOTE The filter should be replaced Adjustable refrigerator every 6 months.

  • 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 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) Auto shuto (feeler arm) 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 from each side).
  • Page 16 3-19-2 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 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: 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 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 22: Pcb Picture

    7. PCB Picture 7-1. Main PCB ( P/N : EBR78940502) ( P/N : EBR78940502) CON8 CON7 CON201 CON6 CON3 CON5 CON2 CON1 7-2. Display PCB ( P/N : EBR79159704) CON102 CON802 CON101 CON3 CON103 - 22 -...
  • Page 23 7-3. Sub PCB ( P/N : EBR76468401) - 23 -...
  • Page 24 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 CON8 CON7 CON201 CON6 CON7 CON3 CON5 CON2 CON1 Resistance [Ω] Short CON7 Open pin ~ 18 Other Normal...
  • Page 25 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 26 8-2. Refrigerator Sensor Error (Er rS) Symptom Check Point 1. Er rS 1. Check for a loose connection 2. Check Sensor Resistance CON8 CON7 CON201 CON6 CON7 CON3 CON5 CON2 CON1 Resistance [Ω] Short CON7 Open pin ~ 16 Other Normal CON7 Resistance [Ω]...
  • Page 27 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 ~ 16...
  • Page 28 8-3. Icing Sensor Error (Er IS) Symptom Check Point 1. Er IS 1. Check f or a loose connection 2. Check Sensor Resistance CON8 CON7 CON201 CON5 CON6 CON3 CON5 CON2 CON1 Resistance [Ω] Short CON5 Open pin ~ 12 Other Normal CON5...
  • Page 29 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 30 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 CON8 CON7 CON201 CON6 CON7 CON3 CON5 CON2 CON1 Resistance [Ω] Short CON7 Open pin ~ 20 Other Normal CON7...
  • Page 31 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 32 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 Defrost Controller CON8 CON7 CON201 CON3 CON6 CON3 CON2 CON5 CON1 Part Resistance [Ω] FUSE-M Def rost Heater 35~40...
  • Page 33 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 TEST MODE 3 Voltage [V] Fuse-M Check the Defrost control part.
  • Page 34 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 CON8 CON7 CON201 CON6 CON7 CON3 CON5 CON2 CON1 TEST MODE 1 Voltage [V]...
  • Page 35 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 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 36 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 CON8 CON7 CON201 CON6 CON7 CON3 CON5 CON2 CON1 TEST MODE 1 Voltage [V]...
  • Page 37 Freezer Fan Error (Er 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 38 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 CON8 CON7 CON201 CON6 CON7 CON3 CON5 CON2 CON1 TEST MODE 1 Voltage [V] CON7...
  • Page 39 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 8~12V? TEST MODE 1 Voltage [V] Go to 3 Check the f an rotating. CON7 8~12V Does f an rotate?
  • Page 40 8-9. Communication Error (Er CO) Symptom Check Point 1. Er CO 1. Check the loose connection 2. Check the Hinge connection CON7 CON201 CON6 CON3 CON2 CON1 CON5 CON5 CON101 Voltage [V] CON101 pin ~ 7 CON101 Not 0V, 5V pin ~ 5 CON101 Not 0V, 5V...
  • Page 41 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 6 pin ~ 7 connection)
  • Page 42 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 - 42 -...
  • Page 43 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 - 43 -...
  • Page 44 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 45 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 - 45 -...
  • Page 46 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 - 46 -...
  • Page 47 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 48 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 49 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 50 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 CON6 CON3...
  • Page 51 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 12V? LED Lamp LED Lamp Change the Check the door S/W resistance. Door S/W Is it correct compared with table? Change the...
  • Page 52 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 CON6 CON3 CON2...
  • Page 53 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 12V? LED Lamp Change the Check the door S/W resistance. Door S/W Is it correct compared with table? Change the...
  • Page 54 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 CON8 CON7 Duct...
  • Page 55 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 9 CON7 Change Resistance [Ω] Check the Damper Resistance Damper pin ~ 16 Is it correct compared with table? 23ºF / -5ºC 32ºF / 0ºC 41ºF / 5ºC...
  • Page 56 Replace Check the Fan Motor voltage Main PCB Is Fan Motor voltage 8~12V? TEST MODE 1 Voltage [V] CON6 8~12V pin ~ 12 Change the Check the Fan Motor voltage motor Is Fan Feed Back voltage 0V, 5V? TEST MODE 1 Voltage [V] CON6 Not 0V, 5V...
  • Page 57 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 CON8 CON7 CON201...
  • Page 58 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 59 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 60: 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 61 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 62 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 63 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 64: 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 65 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 66 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 67 Push Hook Push Hook Push second Push first - 67 -...
  • Page 68 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 69 Push First push Second push - 69 -...
  • Page 70 10-4 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 - 70 -...
  • Page 71 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 72 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 73 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 74 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 - 74 -...

  • Page 75: 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 Test Button Check Voltage about 200V past 30second after turn on Test Mode Comp Ref.
  • Page 76 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 77 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 78 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 79 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 80 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 81 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 82 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 83 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 - 83 -...
  • Page 84 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 85 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 86 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 87 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 88 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 89 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 90: 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 91 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.
  • Page 92 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.
  • Page 93 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.

  • Page 94: Description Of Function & Circuit Of Micom

    14. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM - 94 -...
  • Page 95 K>A@ HKIDA@ K>A@ HKIDA@ - 95 -...
  • Page 96 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.
  • Page 97 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 98 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 103B 610F 271B 103A 207A 282G 402A 406D 610D...
  • Page 99 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 100 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 141F 141B 141B 141D 154A 161B 151C 161C 151A 151B 161C 161A 146E 162B 145D 162A...
  • Page 101 DOOR PARTS CAUTION: Use the part number to order part, not the position number. 500C 241A 231B 233B 231A 233A 241C 241K 212G 235A 241B 241K 241E 241K 241E 312B 205E 243D 243C 243A 262C 244A 244A 262C 243B 619C 262E 624A 405M...
  • Page 102 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 103 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 104 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 105 P/No. MFL68488612 JUL., 2014 Printed in Korea...

Table of Contents