LG LFX28968D Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Refrigerator
  5. LFX28968D
  6. Service manual

LG LFX28968D Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means),
publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless
you have obtained the prior written consent of the LG Electronics entity from which you received this
Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or
logos in this Service Manual.
Copyright © 2016-2017 LG Electronics Inc. All rights reserved. Only training and service purposes
MODEL : LFX28968**
CONFIDENTIAL
COLOR : STAINLESS(ST)
SMOOTH BLACK(SB)
SUPER WHITE(SW)

Advertisement

Table of Contents
loading

Related Manuals for LG LFX28968D

Summary of Contents for LG LFX28968D

  • Page 1 Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.

  • Page 2: Table Of Contents

    3. Take caution not to get water near any electrical components. 4. Use exact replacement parts. 5. Remove any objects from the top prior to tilting the product. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes. - 2 -...

  • Page 3: Specifications

    1. SPECIFICATIONS 1-1 LFX28968** 28 cu.ft. ● ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DOOR DESIGN Side Rounded VEGETABLE TRAY Clear Drawer Type DIMENSIONS (inches) 3 /4 X 35 3 /8 X 69 3 /4 (WXDXH) 28cu.ft. COMPRESSOR Linear NET WEIGHT (pounds) 155kg (342lb) EVAPORATOR Fin Tube Type COOLING SYSTEM...

  • Page 4: Parts Identification

    2. PARTS IDENTIFICATION ADJUSTABLE REFRIGERATOR SHELVING The refrigerator compartment shelves are adjustable to allow flexibility for storage needs. GALLON STORAGE BINS Three interchangeable bins can be arranged to suit your storage needs. REMOVABLE ICE STORAGE BIN The ice storage bin can be removed to fill ice buckets, coolers, or pitchers.

  • 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 ● Press gasket into channels on the four remaining 1. Remove 2 screws. sides of door. Figure 5 Figure 1 2. Lift Mullion up carefully. ● Mullion Replacement 1.

  • Page 7: Door Alignment

    3-3 Door Alignment * Ice Fan Scroll Assembly Replacement If the space between the door are uneven, 1) Remove the plastic guide on the left side, using a follow the instructions to align them. phillips screwdriver to remove the screws. Remove the Base Grillie.

  • Page 8: Lamp

    3-6 LAMP 3-6-2 Freezer Compartment Lamp 1. Unplug refrigerator power cord form outlet. Unplug, or disconnect power at the circuit breaker. 2. Remove screw with driver. If necessary, remove top shelf or shelves. 3. Grasp the cover Lamp, pull the cover downward. 3-6-1 Refrigerator Compartment Lamp 1) Release 2 screws.

  • Page 9: Main Pwb

    3-8 MAIN PWB 1) Loosen 3 screws on the PWB cover. Figure 26 Figure 27 5) Remove the 4) Holding the inner side of lead wire. the dispenser pull forward to remove. Figure 20 CAUTION: When replacing the dispenser cover make sure the lead wire does NOT come off and the water line 2) Remove the PWB cover is not pinched by the dispenser.

  • Page 10: Water Button Assmebly

    3-12 WATER BUTTON ASSMEBLY 3-14 ICEMAKER REPLACEMENT 1) Remove screws. 1) Remove 4 screws as shown. 2) Grasp the Button assembly and lift. Button Lever Figure 31 Figure 33 2) Grasp the bottom of motor cover assembly and pull slowly. 3-13 ICE CORNER DOOR REPLACEMENT 1) Loosen the front screw as shown in the picture.

  • Page 11: Sub Pwb For Working Dispenser

    CAUTION: Make sure that the motor housing is taped to 3-16 CAP DUCT MOTOR REPLACEMENT the mold, if not positioned correctly the cover will not fit 1) Separate the Housing of the Cap Duct Motor. properly. Figure 39 2) Unscrew 3 screws to disassemble the motor. Figure 36 Figure 40 3) When replacing the motor, check the position of the door...

  • Page 12: How To Remove A Ice Bin

    3-17 HOW TO REMOVE A ICE BIN 3-18 HOW TO INSERT A ICE BIN 1) Grip the handles, as shown. 1) Insert the Ice Bin, slightly tilting to avoid touching the Icemaker. (Especially, Ice-Detecting Sensor) Figure 44 Figure 47 2) Tilt and lift slightly as shown. Figure 45 3) Remove ice bin slowly.

  • Page 13: 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 lifting clear from each side).
  • Page 14 3-19-2 Follow Steps to Reinstall ① Assemble a bar and gear ice with screw. Step 1) Insert both side of supporter cover tv into Step 2) ② Push the otherside of the gear to inside of the connector rails, and then screw them. bar.
  • Page 15 3-20 HOW TO REMOVE AND REINSTALL THE HANDLE, FREEZER 3-20-1 Follow Steps to Remove Step 1) Unscrew the screw using wrench. Step 2) Disassemble Decor, Cover. Step 3) While lifting Bracket, Handle, pull the Slider to the Step 4) Unscrew the screw of the Bracket, Handle. direction of the arrow to disassemble.
  • Page 16 3-20-2 Follow Steps to Reinstall Step 1) Assemble Stopper, Handle using Wrench. Step 2) After pushing in Bracket, Handle toward the direction of , push in toward , Move it toward the direction of Step 3) Fix Bracket, Handle with a screw. Step 4) Insert the Slide into the fixed Bracket, Handle in the direction of the arrow.

  • Page 17: Water Valve Disassembly Method

    3-21 WATER VALVE DISASSEMBLY METHOD 3-22 FAN AND FAN MOTOR DISASSEMBLY 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. MOTOR COVER Figure 64 Figure 60...

  • Page 18: Drawer Removal

    3-23 Drawer Removal Fully extend the drawer and lift from the front pulling straight out. Figure 66 To install the drawer back into the frame, tilt the front sightly and pushingt back into place. Figure 67 - 18 -...

  • 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 3 hours after the error : All errors, except for "E rt", "E HS", "E IS(except for Icing sensor)", "E gF", "E It"...

  • Page 22: Pcb Picture

    7. PCB Picture 7-1. Main PCB ( P/N : EBR747964**) CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 7-2. Display PCB ( P/N : EBR786319**) CON101 CON102 CON103CON105...
  • Page 23 7. PCB Picture 7-3. Sub PCB ( P/N : EBR60070711/33)
  • Page 24 8. Trouble Shooting 8-1. Freezer Sensor Error (E FS) Symptom Check Point 1. E FS 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Resistance [Ω] Short CON7 Open pin ~ 16 Other Normal CON7...
  • Page 25 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? Check the Temperature and resistance refer to the table. No problem? CON7 CON7 Resistance [Ω] pin ~ 16...
  • Page 26 8-2. Refrigerator Sensor Error (E rS) Symptom Check Point 1. E rS 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Resistance [Ω] Short CON7 Open pin ~ 14 Other Normal CON7 Resistance [Ω] pin ~ 14...
  • Page 27 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? Check the Temperature and resistance refer to the table. No problem? CON7 CON7 Resistance [Ω] pin ~ 14...
  • Page 28 8-3. Icing Sensor Error (E IS) Symptom Check Point 1. E IS 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Resistance [Ω] CON5 Short pin ~ 17 Open Other Normal CON5 Resistance [Ω] pin ~ 17...
  • Page 29 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? Check the Temperature and resistance refer to the table. No problem? CON5 Resistance [Ω] pin ~ 17 -22ºF / -30ºC...
  • Page 30 8-4. Defrost Sensor Error (F dS) Symptom Check Point 1. F dS 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Resistance [Ω] Short CON7 Open pin ~ 18 Other Normal CON7 Resistance [Ω] pin ~ 18...
  • 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 Defrost controller and Sensor? Check the Temperature and resistance refer to the table. No problem? CON7 Resistance [Ω] pin ~ 18...
  • Page 32 8-5. Ice Maker Motor Error (E It) Symptom Check Point 1. E It 1. Check the Ice maker rotation 2. Check the motor voltage CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4...
  • Page 33 Ice Maker Motor Error (E It) Change the Explain to Main PCB Input Ice Maker test mode(Push customer Check the ice maker forward status The ice maker test button),check The voltage (1)~(2) point 0V? The Ice Tray,Ice maker motor Rotate? Change the Check the ice maker reverse status Main PCB...
  • Page 34 8-6. Defrost Heater Error (F dH) Symptom Check Point 1. F dH 1. Check the door gasket 2. Check the Defrost control part 3. Check the PCB output voltage CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Part Resistance [Ω] FUSE-M Defrost Heater 34~42...
  • Page 35 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] Defrost Check the Defrost control part.
  • Page 36 8-7. Freezer Fan Error (E FF) Symptom Check Point 1. E FF 1. Check the air flow 2. Check the Fan Motor 3. Check the PCB Fan motor voltage CON2 CON3 CON5 CON1 Fan Motor CON6 CON201 CON7 CON4 TEST MODE 1 Voltage [V] CON7 8~12V...
  • Page 37 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? CON7 TEST MODE 1 Voltage [V] Go to 3 Open the freezer door and Check CON7 8~12V the air flow.
  • Page 38 8-8. Icing Fan Error (E IF) Symptom Check Point 1. E IF 1. Check the air flow 2. Check the Connector 3. Check the PCB Fan motor voltage CON2 CON3 CON5 CON1 Fan Motor CON6 CON201 CON7 CON4 TEST MODE 1 Voltage [V] CON7 8~12V...
  • Page 39 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? CON7 TEST MODE 1 Voltage [V] Go to 3 Open the freezer door and Check CON7 8~12V the air flow.
  • Page 40 8-9. Condenser Fan Error (E CF) Symptom Check Point 1. E CF 1. Check the air flow 2. Check the Connector 3. Check the PCB Fan motor voltage Fan Motor CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 TEST MODE 1 Voltage [V] CON7 8~12V...
  • Page 41 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? CON7 TEST MODE 1 Voltage [V] Go to 3 Check the fan rotating. CON7 8~12V Does fan rotate?
  • Page 42 8-10. Communication Error (E CO) Symptom Check Point 1. E CO 1. Check the loose connection 2. Check the Hinge connection CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Display Voltage [V] CON101 pin ~ 6 CON101 Not 0V, 5V pin ~ 5 CON101 Not 0V, 5V...
  • Page 43 Communication Error (E CO) Change the Main PCB Check the voltage. Is CON101 5 pin ~ 3 voltage 0V or 5V? Check the loose connection Voltage Housing CON101 pin ~ 3 0V, 5V Check the Check the voltage. Hinge (loose connection) Is CON101 5 pin ~ 6...
  • Page 44 8-11. Cube mode doesn’t work Symptom Check Point 1. Cube mode 1. Check the loose connection doesn’t work 2. Check the resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 CON1 CON2 (BK) (WH) Ice Maker Geared Motor Dispenser Motor...
  • Page 45 8-11. Cube mode doesn’t work LEVER S/W Voltage [V] Resistance [Ω] Pushing 112~115V Geared Motor 31.1 ~ 42.1 CON2 Dispenser Motor 9.9 ~ 12.1 pin ~ 12 0~2V Pushing Pushing 9~12V CON3 5 pin ~ CON1 13 0~2V Pushing...
  • Page 46 Cube mode doesn't work Replace Geared Motor Check the resistance value. Is Geared Motor resistance 144~ 176Ω? Check the loose connection Check the voltage. Geared Motor Change the (while pushing the lever S/W) Is voltage correct? Resistance [Ω] Geared Motor 31.1 ~ 42.1 CON2 (BK)
  • Page 47 8-12. Crush mode doesn’t work Symptom Check Point 1. Crush mode 1. Check the loose connection doesn’t work 2. Check the resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 CON1 CON2 (SB) (WH) Ice Maker Geared Motor Dispenser Motor...
  • Page 48 8-12. Crush mode doesn’t work LEVER S/W Voltage [V] Resistance [Ω] Pushing 112~115V Geared Motor 31.1 ~ 42.1 CON2 Dispenser Motor 9.9 ~ 12.1 pin ~ 4 0~2V Pushing Pushing 9~12V CON3 5 pin ~ CON1 13 0~2V Pushing...
  • Page 49 Crush mode doesn't work Replace Geared Motor Check the resistance value. Is Geared Motor resistance 87 ~ 107Ω? Check the loose connection Check the voltage. Geared Motor Change the (while pushing the lever S/W) Is voltage correct? Resistance [Ω] Geared Motor 31.1 ~ 42.1 CON2 (SB)
  • Page 50 8-13. Water mode doesn’t work Symptom Check Point 1. Water mode 1. Check the loose connection doesn’t work 2. Check the resistance valve (PR) (BL) CON2 LEVER S/W Voltage [V] Pushing 112~115V CON2 pin ~11 0~2V Pushing Resistance [Ω] Pilot Valve 360~420 Water valve 360~420...
  • Page 51 Water mode doesn't work Replace Check the loose connection Water Valve Check the resistance value. Is Water Valve resistance 360~420 Ω? Change the Check the voltage. (while pushing the lever S/W) Is voltage correct? Water Valve Resistance [Ω] Water valve 360~420 CON2 LEVER S/W...
  • Page 52 8-14. Refrigerator room lamp doesn’t work Symptom Check Point 1. Refrigerator room 1. Check the Refrigerator door switch sticky lamp doesn’t work 2. Check the door S/W resistance 3. Check the LED Lamp CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Door S/W CON6...
  • Page 53 Refrigerator room lamp doesn’t work Change the Check the LED Lamp voltage. Change the Check the Refrigerator door switch. Door S/W Is it 0~2V? (While door closed) Door S/W Does it feel sticky? Change the Check the door S/W resistance. Door S/W 5 Check the LED Lamp voltage.
  • Page 54 8-15. Freezer room lamp doesn’t work Symptom Check Point 1. Freezer room lamp 1. Check the Freezer door switch sticky doesn’t work 2. Check the door S/W resistance 3. Check the LED Lamp CON2 CON3 CON5 CON1 CON6 CON201 CON7 F room LED PCB CON4 Door S/W...
  • Page 55 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 feel sticky? Is voltage 12V? (While door open) Change the Check the door S/W resistance. Door S/W Is it correct compared with table? Explain to customer...
  • Page 56 8-16. Poor cooling in Fresh food section Symptom Check Point 1. Poor cooling in Fresh 1. Check the sensor resistance food section 2. Check the air flow 3. Check the air Temperature 4. Check the R-Damper motor voltage CON2 CON3 CON5 CON1 Duct...
  • Page 57 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 7 Check the Fan Motor voltage CON7 Replace Is Fan Motor voltage 8~12V? Resistance [Ω] Main PCB pin ~ 14 23ºF / -5ºC...
  • Page 58 8-17. Poor cooling in Freezer compartment Symptom Check Point 1. Poor cooling in 1. Check the sensor resistance Freezer compartment 2. Check the air flow 3. Check the air Temperature 4.Check the Fan motor sticky 5. Check the Fan motor voltage CON2 CON3 CON5...
  • Page 59 Poor cooling in Freezer compartment Check the Compressor Check the air temperature. and sealed Is it cold? Check the sensor resistance. system Change the CON7 Resistance [Ω] Fan motor Check the Fan motor. pin ~ 16 Rotate fan using hand. -22ºF / -30ºC It feel sticky? -13ºF / -25ºC...
  • Page 60 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 61 8-17. Over cooling in Freezer compartment Symptom Check Point 1. Over cooling in 1. Check the sensor resistance Freezer compartment 2. Check the air flow 3. Check the air Temperature 4.Check the Fan motor sticky 5. Check the Fan motor voltage CON2 CON3 CON5...
  • Page 62 Over cooling in Freezer compartment Change the Fan motor Check the Fan motor. Rotate fan using hand. Check the sensor resistance. It feel sticky? Fan Motor CON7 Resistance [Ω] pin ~ 16 -22ºF / -30ºC -13ºF / -25ºC -4ºF / -20ºC Change the Main PCB -13ºF / -25ºC 14ºF / -10ºC...
  • Page 63 8-18. Hygiene fan doesn’t work Symptom Check Point 1. Hygiene fan doesn’t 1. Check Hygiene Fan motor voltage work 2. Main PCB CON2 CON3 CON5 CON1 CON6 CON201 CON7 Hygiene Fan motor CON4 CON6 Voltage [V] CON6 pin ~ 6...
  • Page 64 Hygiene fan doesn’t work Change the Change the Fan motor Check the Hygiene voltage Choose the Hygiene Max in display Is voltage 12V? (While door open) Check the PCB Voltage. Is CON6 2 pin ~ 6 voltage 12V? Voltage [V] CON6 pin ~ 6 Explain to customer...
  • Page 65 8-19. Hygiene LED doesn’t work Symptom Check Point 1. Hygiene LED 1. Check Hygiene LED voltage doesn’t work 2. Main PCB CON2 CON3 CON5 CON1 CON6 CON201 CON7 Hygiene LED CON4 CON6 Voltage [V] CON6 pin ~ 6...
  • Page 66 Hygiene LED doesn’t work Change the Change the Fan motor Check the Hygiene LED voltage Choose the Hygiene Max in display Is voltage 12V? (While door open) Check the PCB Voltage. Is CON6 4 pin ~ 6 voltage 12V? Voltage [V] CON6 pin ~ 6 Explain to customer...

  • Page 67: Reference

    10. REFERENCE 10-1 TEST MODE and Removing TPA 1. How to enter the TEST MODE Push the test button on the Main PCB to enter the TEST MODE. * 1 time : Comp / Damper / All FAN on (Everything is displayed) * 2 times : Damper closed (22 22 displayed) * 3 times : Forced defrost mode...
  • Page 68 10-2 TEMPERATRUE CHART - FRZ AND ICING SENSOR TEMP RESISTANCE VOLTAGE -39°F (-40°C) 73.29 ㏀ 4.09 V -30°F (-35°C) 53.63 ㏀ 3.84 V -21°F (-30°C) 39.66 ㏀ 3.55 V -13°F (-25°C) 29.62 ㏀ 3.23 V -4°F (-20°C) 22.33 ㏀ 2.89 V 5°F (-15°C) 16.99 ㏀...
  • Page 69 10-3 TEMPERATRUE CHART - REF AND DEF SENSOR TEMP RESISTANCE VOLTAGE -39°F (-40°C) 225.1 ㏀ 4.48 V -30°F (-35°C) 169.8 ㏀ 4.33 V 129.3 ㏀ -21°F (-30°C) 4.16 V 99.30 ㏀ -13°F (-25°C) 3.95 V 76.96 ㏀ -4°F (-20°C) 3.734 V 60.13 ㏀...
  • Page 70 10-4 How to check the Fan-Error (1) EBR650027** 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 71 - 26 -...
  • Page 72 11-4 Door Switch Function The switch senses if the door is open or closed. - When the door open, lamp on. - When the door open, the switch give information to Micom. When the door open, internal contact operate on and off moving plunger of door switch up and down.
  • Page 73 11-5 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 9.9 ~ 12.1 Ω (1) to (2) - 28 -...
  • Page 74 11-6 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 (3) (1) and (2) Check the resistance between connectors (In-door motor 1, 2) and...
  • Page 75 11-7 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 76 11-9 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 4 ~ 30 kΩ Red wire to Black wire - 31 -...

  • Page 77: Compressor Troubleshooting

    12. 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 78 12-1 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 IPM Output check - Measure the voltage between the POWER and COMM pins of the connector as shown below.
  • Page 79 12-2 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) andPoint C (Capacitor Voltage) when compressor is off .
  • Page 80 B3. LED blinks five times, then repeats (Locked Piston) 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. - Logic: Compressor is forced off and tries to restart within 2.5 minutes.
  • Page 81 B5. LED blinks seven times, then repeats (IPM Fault) Protection Logic 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 82 12-3 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 83 12-4 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 84 Compressor Troubleshooting WARNING HIGH VOLTAGE Step 1) Open PWB cover Step 2) Check for blinking frequency of LED, PWB LED Lamp If 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...
  • Page 85 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 86 12-5 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 87 12-6 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 88 12-6-2 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 89 13. ICEMAKER OPERATING METHOD AND TROUBLE SHOOTING 13-1 Icemaker’s Basic Operating Method Power On Power On Start Position • Adjusts Ice Tray to Start Position with power on. • Adjusts Ice Tray to Start Position with power on. • Waits until water becomes ice. Icemaking ※For cold air circulation, Ice tray will be Mode...
  • Page 90 13-2 ICE MAKER FUNCTIONS 13-2-1 Icemaking Mode 1. Icemaking Mode begins right after the ice tray fills with water. 2. Icemaker waits until water becomes ice in the ice tray. ※ Ice-detecting sensor checks if the ice bin is full every 2min. 13-2-2 Harvest Mode At least in 110min, since icemaker begun icemaking mode, Icemaker starts to twist the ice tray to drop ices into the Ice bin.
  • Page 91 13-3-2 Icemaker not making ice or not making enough ice (Icemaker Unit & Ice-detecting sensor Diagnosis) ▶ Icemaker Unit and Ice-detecting sensor Diagnosis The icemaker unit and Ice-detecting sensor is programmed to be diagnosed. Follow the procedure step by step to check to see if icemaker and Ice-detecting sensor is working normally. Icemaker Unit Ice-detecting sensor Fill Key...
  • Page 92 STEP (Ice-detecting sensor Diagnosis) 2. Close the left door 1. Remove Ice bin from compartment 3. Wait for 3min. (Door switch pushed) 4. Freezer door stays open 5. Push the refrigerator button & lock button at the same time. “ETY ”...

  • Page 93: Description Of Function & Circuit Of Micom

    14. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM 14-1 FUNCTION 14-1-1 Function 1. When the appliance is plugged in, it is set to 37°F for Refrigerator and 0°F for freezer. You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button. 2.
  • Page 94 14-1-4 Filter condition display function 1. There is a replacement indicator light for the filter In initial Power On Blinking Classification / Filter RESET cartridge on the dispenser. 2. Water filter needs replacement once six months or of using water filter. Filter Status Replace Replace...
  • Page 95 14-1-7 CONTROL OF FREEZER FAN MOTOR 1. Freezer fan motor has high and standard speeds. 2. High speed is used at power-up, for Ultra Ice, and when refrigerator is overloaded. Standard speeds is used for general purposes. 3. To improve cooling speed, the RPM of the freezer fan motor change from normal speed to high. 4.
  • Page 96 14-1-12 Defrosting (removing frost) 1. Defrosting starts each time the COMPRESSOR running time Betwee 7~50 hours. 2. For initial power on or for restoring power, defrosting starts when the compressor running time reaches 4 hours. 3. Defrosting stops if the sensor temperature reaches 46.4°F(8°C) or more. If the sensor doesn’t reach 46.4°F(8°C) in 1 hours, the defrost mode is malfunctioning.
  • Page 97 EXPLODED VIEW & REPLACEMENT PARTS LIST CASE PARTS 624A 503E 503D 207B 624E 402A 626A 624G 624C 503G 610F 409D 624B 500P 158A 103B 103A 501F 207A 271B 120A 402A 406D 610D 150A 150C 150B 150D 282G 410J 271D 120B 500A 145A 145B...
  • Page 98 FREEZER PARTS CAUTION: Use the part number to order part, not the position number. 133B 133B 145C 131A 136C 136B 133A 133B 132P 145F 237C 136A...
  • Page 99 REFRIGERATOR PARTS 141A CAUTION: Use the part number to order part, not the position number. 141C 141C 141A 141E 141E 141B 141B 141A 140A 141C 142D 142B 141E 142A 141B 141D 161C 161B 154A 151B 146A 151A 162B 161A 145D 162A...
  • Page 100 DOOR PARTS CAUTION: Use the part number to order part, not the position number. 241K 231B 233B 233A 231A 212G 235A 241K 241D 241G 241D 312B 241E 243D 243C 262C 619B 243A 243E 615A 244A 244A 243B 262C 262E 267A 253A 250B 250A...
  • Page 101 DISPENSER PARTS CAUTION: Use the part number to order part, not the position number. 276A 276G 276F 275A 405A 276B 279A 279I 278D 279H 279J 402C 278C 501D 279B 279D 500C 281B 279E 281A 501A 279C...
  • Page 102 VAL VE & WATER TUBE PARTS CAUTION: Use the part number to order part, not the position number. 617A 625A 616G 616G 623B 616J 623B 616J 627B 627A 619A...
  • Page 103 ICE MAKER & ICE BIN PARTS CAUTION: Use the part number to order part, not the position number. 630J 630J 612A 630F 630B 600A 607A 630C 611A 630A 630H 630D 606A 630E 630Q 630G...

This manual is also suitable for:

Lfx28968 series

Table of Contents