LG LFCC22426S Service Manual
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LG LFCC22426S Service Manual

LG LFCC22426S Service Manual

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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 STRICT Y 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 prohi-
bition includes, without limitation, any text, graphics or logos in this Service Manual.
Copyright © 2018-2019 LG Electronics Inc. All rights reserved. Only training and service purposes.
MODEL : LFCC22426S*
CONFIDENTIAL

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Summary of Contents for LG LFCC22426S

  • Page 1 Service Manual is STRICT Y 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 prohi- bition includes, without limitation, any text, graphics or logos in this Service Manual.

  • Page 2: Table Of Contents

    4. Use exact replacement parts. 5. Remove any objects from the top prior to tilting the product. Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes. Copyright © 2018-2019 LG Electronics Inc.All rights reserved. Only training and service purposes.

  • Page 3: Specifications

    1. SPECIFICATIONS 1. SPECIFICATIONS 1-1 LFCC22426S 22.8 cu.ft. ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS Side Rounded '225 '(6,*1 9(*(7$%/( 75$< Clear Drawer Type Linear 35 ¾ X 31 ¼ X 69 ¾ (WXDXH) ',0(16,216 LQFKHV &2035(6625 22.8cu.ft. 114kg (251lb) 1(7 :(,*+7 SRXQGV ...

  • Page 4: Parts Identification

    2. PARTS IDENTIFICATION LED Interior Lighting Control Panel Lights up the inside of the refrigerator. Sets the refrigerator and freezer temperatures. Adjustable Refrigerator Shelf Water filter Adjustable shelves to meet individual storage Purifies water. needs. Crisper Glide‘N’Serve Helps vegetables and fruit to stay crisp. Stores food items at a different temperature than the regular refrigerator area.

  • Page 5: Disassembly

    3. DISASSEMBLY 3. DISASSEMBLY 3-1 Removing Refrigerator Door CAUTION : %HIRUH \RX EHJLQ XQSOXJ WKH UHIULJHUDWRU 5HPRYH IRRG DQG ELQV IURP GRRUV Left Door -FIG. 1&2 ● 1. Open door. Loosen top hinge cover screw (1). Use flat tip screwdriver to pry back hooks on front underside of cover (2). Lift up cover. 2.

  • Page 6: Door

    3-2 DOOR Door Gasket Replacement 1. Insert gasket into channel Mullion Removal 3UHVV JDVNHW LQWR FKDQQHOV RQ WKH IRXU UHPDLQLQJ 1. Remove 2 screws. VLGHV RI GRRU 2. Lift Mullion up carefully. Mullion Replacement 1. Connect wire harness. 3. Disconnect wire harness. 2.

  • Page 8: Door Alignment

    3-5 FAN AND FAN MOTOR(EVAPORATOR) 3-4 Door Alignment  5HPRYH WKH IUHH]HU GUDZHU ,I \RXU UHIULJHUDWRU KDV DQ Both the left and right refrigerator doors have an LFHPDNHU UHPRYH WKH LFHPDNHU ILUVW adjustable nut, located on the bottom hinge, to raise  5HPRYH WKH SODVWLF JXLGH IRU VOLGHV RQ OHIW VLGH E\ and lower them to align properly.

  • Page 9: Defrost Control Assembly

    3-6 DEFROST CONTROL ASSEMBLY 3-7-2 Cap Decor LED LAMP(Bottom) Defrost Control assembly consists of Defrost Sensor and 1. Unplug refrigerator power cord from electric outlet. FUSE-M. 2. Open the refrigerator door to need diassembly. The Defrost Sensor works to defrost automatically. It is 3.

  • Page 10: Main Pwb

    3-9 MAIN PWB 3-10 CAP DUCT MOTOR REPLACEMENT 1) Loosen 3 screws on the PWB cover. 1) Separate the Housing of the Cap Duct Motor. 2) Remove the PWB cover. 2) Unscrew 3 screws to disassemble the motor.  :KHQ UHSODFLQJ WKH PRWRU FKHFN WKH SRVLWLRQ RI WKH GRRU 3) Disconnect wire harness and replace the main PWB GXFW DQG WKH OLQN IRU SURSHU ILW in the reverse order of removal.

  • Page 11: How To Remove And Reinstall The Pullout Drawer

    3-11 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER 3-11-1 Follow Steps to Remove Step1) 2SHQ WKH IUHH]HU GRRU 6WHS  5HPRYH WKH ORZHU EDVNHW Step 4) Removal of the freezer door is done by lifting clear Step 3) Remove the two screws from the guide rails. (one from each side) of the rail support.
  • Page 12 3-11-2 Follow Steps to Reinstall Step 1) ,QVHUW ERWK VLGH RI VXSSRUWHU cover TV into Step 2) Assemble a bar and gear ice with screw 3XVK WKH RWKHUVLGH RI WKH JHDU WR LQVLGH RI WKH FRQQHFWRU UDLOV DQG WKHQ VFUHZ WKHP EDU 6WHS  3XW JHDU LFH DVVHPEOHG ZLWK WKH EDU E\ VFUHZ LQWR 6WHS  ,QVHUW RSSRVLWH JHDU LFH LQWR FRQQHFWRU UDLO DQG...

  • Page 13: Water Valve Disassembly Method

    3-12 WATER VALVE DISASSEMBLY METHOD 3-13 FAN MOTOR ASSEMBLY AND DISASSMEMBLY METHOD 1) 7XUQ RII WKH ZDWHU WR XQLW 5HPRVH WKH ZDWHUlLQH IURP WKH YDOYH 1) Remove screws for the Drain Pipe Assembly and the 1 connected to the Motor Cover.  5HPRYH FRYHU DQG  VFUHZ IURP WKH YDOYH 0HFKDQLFDO &RYHU 2) Remove the screw from shroud and Separate the Fan...

  • Page 14: Drawer Removal

    3-15 HOW TO REMOVE AND REFIT THE FRIDGE SHELF 3-14 DRAWER REMOVAL 1) Pull the drawer open to full extension. 3-15-1 Removing the Fridge Shelf 2) Gently lift and pull out the ice bin. 1) Tilt the front of the shelf up and then lift the shelf straight up. 2) Lower the front of the shelf so that the hooks into the holes.

  • Page 15: How To Remove The Vegetable Drawer

    3-16 HOW TO REMOVE THE VEGETABLE DRAWER 3-17 HOW TO REMOVE THE DOOR BASKET 1) To remove the basket, simply lift the bin up 1) Remove the contents of the drawer. and pull straight out. Holde the handle of the drawer and gently pull it out completely until it stops.

  • Page 16: Adjustment

    4. ADJUSTMENT 4. ADJUSTMENT 4-1 COMPRESSOR 4-2-3 Compressor protection logic 6LQFH OLQHDU &RPS FRQGXFWV OLQHDU UHFLSURFDWLQJ PRWLRQ 4-1-1 Role ZH KDYH SURWHFWLRQ ORJLF IRU FRPSUHVVRU PRWRU DQG 3&% 7KH FRPSUHVVRU LQWDNHV ORZ WHPSHUDWXUH DQG ORZ SUHVVXUH DV WKH EHORZ JDV IURP WKH HYDSRUDWRU RI WKH UHIULJHUDWRU DQG FRPSUHVVHV WKLV JDV WR KLJKWHPSHUDWXUH DQG KLJKSUHVVXUH JDV ,W WKHQ  6WURNH 7ULS GHOLYHUV WKH JDV WR WKH FRQGHQVHU...

  • Page 17: Circuit Diagram

    5. CIRCUIT DIAGRAM 5. CIRCUIT DIAGRAM MEZ66414026 (Label,Circuit) -20- - 20 -...

  • Page 18: Troubleshooting

    6. TROUBLESHOOTING 6. TROUBLESHOOTING 6-1 Error Code Summary WARNING: :KHQ FKHFNLQJ 5HVLVWDQFH YDOXHV PDNH VXUH WR WXUQ RII WKH SRZHU DQG ZDLW IRU WKH YROWDJH WR GLVFKDUJH NOTE) :LWKLQ  KRXUV DIWHU WKH HUURU  3UHVV WKH ,FH 3OXV EXWWRQ DQG )UHH]HU EXWWRQ VLPXOWDQHRXVO\  KRXUV DIWHU WKH HUURU  $OO HUURUV H[FHSW IRU ³UW (´ ³+6 (´ ³,6 (´...

  • Page 19: Pcb Picture

    7. PCB Picture 7. PCB Picture 7-1. Main PCB ( P/N : EBR838450**) CON2 CON3 CON5 CON1 CON7 CON201 CON4 7-2. Display PCB ( P/N : EBR841464**) CON103 CON102 CON101 CON802 -22-...
  • Page 20 8. Trouble Shooting 8. Trouble Shooting 8-1. Freezer Sensor Error (FS E) Symptom Check Point 1. FS E 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON201 CON7 CON4 Resistance [Ω] Short CON7 Open pin ~ 20 Other Normal...
  • Page 21 Freezer Sensor Error (FS E) 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 ~ 20...
  • Page 22 8-2. Refrigerator Sensor Error (rS E) Symptom Check Point 1. rS E 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON201 CON7 CON4 Resistance [Ω] Short CON7 Open pin ~ 18 Other Normal CON7 Resistance [Ω] pin ~ 18 23ºF / -5ºC...
  • Page 23 Refrigerator Sensor Error (rS E) 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 ~ 18...

  • Page 24: Troubleshooting With Error Display

    8-3. Defrost Sensor Error (dS F) Symptom Check Point 1. dS F 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON201 CON7 CON4 Resistance [Ω] Short CON7 Open pin ~ 22 Other Normal CON7 Resistance [Ω] pin ~ 22 23ºF / -5ºC...
  • Page 25 Defrost Sensor Error (dS F) 4 Check the Temperature and Change resistance refer to the table. Main No problem? Reconnect or Is the Connector disconnected repair the or loose between Main PCB, connector Defrost controller and Sensor? CON7 Resistance [Ω] pin ~ 22 23ºF / -5ºC 32ºF / 0ºC...
  • Page 26 8-4. Defrost Heater Error (dH F) Symptom Check Point 1. dH F 1. Check the door gasket 2. Check the Defrost control part 3. Check the PCB output voltage CON2 CON3 CON5 CON1 CON201 CON7 CON4 Part Resistance [Ω] FUSE-M Defrost Heater 34~42 Defrost Sensor...
  • Page 27 Defrost Heater Error (dH F) 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 112V ~ 116V? Change TEST MODE 3 Voltage [V] Check the Defrost control part.
  • Page 28 8-5. Freezer Fan Error (FF E) Symptom Check Point 1. FF E 1. Check the air flow 2. Check the Fan Motor 3. Check the PCB Fan motor voltage CON2 CON3 CON5 Fan Motor CON1 CON201 CON7 CON4 TEST MODE 1 Voltage [V] CON7 pin ~ 14...
  • Page 29 Freezer Fan Error (FF E) Reset the unit and Check the Fan Motor voltage Input Test1 Mode. Replace Is Fan Motor voltage 12V? (Push the button 1 time) Main PCB CON7 Voltage [V] TEST MODE 1 CON7 Go to 3 pin ~ 14 Open the freezer door and Check the air flow.
  • Page 30 8-6. Condenser Fan Error (CF E) Symptom Check Point 1. CF E 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 TEST MODE 1 Voltage [V] CON7 pin ~ 6...
  • Page 31 Condenser Fan Error (CF E) Reset the unit and Check the Fan Motor voltage Input Test1 Mode. Replace Is Fan Motor voltage 12V? (Push the button 1 time) Main PCB CON7 TEST MODE 1 Voltage [V] CON7 Go to 3 pin ~ 6 Check the fan rotating.
  • Page 32 8-7. Communication Error (CO E) Symptom Check Point 1. CO E 1. Check the loose connection 2. Check the Hinge connection CON2 CON3 CON5 CON1 CON201 CON7 CON101 Display CON101 Voltage [V] CON101 pin ~ 6 CON101 Not 0V, 5V pin ~ 6 CON101 Not 0V, 5V...
  • Page 33 Communication Error (CO E) Change the Main PCB Check the voltage. Is CON101 4 pin ~ 6 voltage 0V or 5V? Check the loose connection Voltage Housing CON101 Check the pin ~ 6 0V, 5V Check the voltage. Hinge (loose connection) Are CON101 7 pin ~ 6...
  • Page 34 8-8. 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 Door S/W CON2 CON3 CON5 CON1 CON201 CON7 CON4 S/W Resistance [Ω]...
  • Page 35 Refrigerator room lamp doesn’t work Check the LED Lamp voltage. Change the Change the Check the Refrigerator door switch. Is it 0~2V? (While door closed) Door S/W 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 36 8-9. Freezer room upper lamp doesn’t work Symptom Check Point 1. Freezer room upper 1. Check the Freezer door switch sticky lamp doesn’t work 2. Check the door S/W resistance 3. Check the LED Lamp F U LED PCB CON2 CON3 Door S/W CON5 CON1...
  • Page 37 Freezer room upper lamp doesn’t work Change the Change the Check the Freezer door switch. LED Lamp Check the LED Lamp voltage Door S/W 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 38 8-10. 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 39 Poor cooling in Fresh food section Check the air temperature. Check the Is it cold? Compressor and sealed Check the sensor resistance. system Go to 7 Check the Fan Motor voltage Replace Is Fan Motor voltage right? CON7 Resistance [Ω] Main PCB pin ~ 18 23ºF / -5ºC...
  • Page 40 8-11. 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 CON1...
  • Page 41 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 ~ 20 Rotate fan using hand. -22ºF / -30ºC It feel sticky? -13ºF / -25ºC...
  • Page 42 Replace Check the Fan Motor voltage Main PCB Is Fan Motor voltage right ? Voltage [V] TEST MODE 1 CON7 12 pin ~ 14 0V<Voltage<5V CON7 16 pin ~ 14 7 Check the Fan Motor voltage Change the Is Fan Feed Back voltage right? motor TEST MODE 1 Voltage [V]...
  • Page 43 8-12. 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 CON1...
  • Page 44 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 ~ 20 -22ºF / -30ºC -13ºF / -25ºC -4ºF / -20ºC Change the Main PCB -13ºF / -25ºC 14ºF / -10ºC...

  • Page 45: Reference

    10. 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)
  • Page 46 10-2 TEMPERATRUE CHART - FRZ AND ICING SENSOR TEMP RESISTANCE VOLTAGE ƒ) ƒ&  9  ƒ) ƒ&  9  ƒ) ƒ&  9  ƒ) ƒ&  9  ƒ) ƒ&  9  ƒ) ƒ&  9  ƒ) ƒ& ...
  • Page 47 10-3 TEMPERATRUE CHART - REF AND DEF SENSOR TEMP RESISTANCE VOLTAGE ƒ) ƒ&  9  ƒ) ƒ&  9  ƒ) ƒ&  9  ƒ) ƒ&  9  ƒ) ƒ&  9  ƒ) ƒ&  9  ƒ) ƒ& ...
  • Page 48 10-4 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 49: Component Testing Information

    11. COMPONENT TESTING INFORMATION 11. COMPONENT TESTING INFORMATION 11-1 Defrost Controller Assembly Function 7KH FRQWUROOHU DVVHPEO\ LV PDGH XS RI WZR GLIIHUHQW NLQGV RI SDUWV 7KH IXVH DQG WKH VHQVRU 7R GHWHUPLQH LI WKHVH SDUWV DUH GHIHFWLYH FKHFN IRU UHVLVWDQFH 7KH IXVH ZLOO FXW SRZHU WR WKH GHIURVW KHDWHU DW YHU\ KLJK WHPSHUDWXUHV How to 6HW D RKPPHWHU WR WKH  KRXVLQJ SLQ...
  • Page 50 11-2 Sheath Heater Function 6KHDWK KHDWHU LV D SDUW IRU GHIURVW $OO KHDWLQJ ZLUH LV FRQQHFWHG WR RQO\ RQH OLQH 7R FKHFN LI WKH SDUW LV GHIHFWLYH FKHFN WKH UHVLVWDQFH How to Measure (1) (2) 6HW D RKPPHWHU FRQQHFW WR 7KH  KRXVLQJ SLQ 0HDVXUH WKH  SLQ FRQQHFWHG WR 6KHDWK +HDWHU ,I WKH RKPPHWHU LQGLFDWH 9ƒ¡9 :DWW 5 LV JRRG FRQGLWLRQ H[ ZKHQ ZDWW Z YROWDJH Y 5 ƒ¡  ...
  • Page 51 11-3 Door Heater Assembly 1.9-2.2KΩ -75- - 75-...
  • Page 52 11-5 Dispenser DC Motor Function ˜ 'LVSHQVHU '& 0RWRU  :KHQ FXVWRPHU SXVK WKH GLVSHQVHU EXWWRQ 3XOO GXFW GRRU DQG DEVWUDFW IURP LFH EDQN How to Measure † Dispensor DC Motor Standard Dispenser DC Motor 7HVW 3RLQWV 5HVXOW  WR   a  -76- - 50 -...
  • Page 53 11-6 AC Motor ASSEMBLY Function 7KH PRWRU LQ WKH GRRU SXVKHG WKH LFH LQWR WKH GLVSHQVHU How to < In-door Motor > < In-door Motor > Measure 6HSDUDWH WKH 6HSDUDWH WKH KRXVLQJ KRXVLQJ 0HDVXUH WKH 0HDVXUH WKH UHVLVWDQFH EHWZHHQ UHVLVWDQFH EHWZHHQ  DQG   DQG  &KHFN WKH UHVLVWDQFH EHWZHHQ FRQQHFWRUV ,QGRRU PRWRU   DQG...
  • Page 54 11-7 Damper Function 7KH GDPSHU VXSSOLHV FROG DLU IURP WKH IUHH]HU WR WKH FKLOO URRP XVLQJ WKH GDPSHU SODWH 7KH FKLOO URRP LV FROGHU ZKHQ WKH GDPSHU SODWH LV RSHQ :KHQ WKH GDPSHU LV FORVHG WKH FKLOO URRPV WHPSHUDWXUH ZLOO ULVH How to Measure <...
  • Page 55 11-9 Flow Sensor Function )ORZ 6HQVRU LQ PDFKLQH URRP &RXQW WKH ZDWHU TXDQWLW\ IURP FLW\ ZDWHU WR ZDWHU ILOWHU LQ UHIULJHUDWRU How to Measure )ORZ 6HQVRU LQ PDFKLQH URRP Standard 7HVW 3RLQWV 5HVXOW 5HG ZLUH WR %ODFN ZLUH  a  ‹ -79- - 54 -...

  • Page 56: Compressor Troubleshooting

    12. COMPRESSOR TROUBLESHOOTING 12. Compressor Troubleshooting PCB Check (Simplify) 3URWHFWLRQ /RJLF TEST 1 Mode A-inverter &RQ 7LPH!VHF Power Off 3RZHU 2Q 3&% 2. 'LVFRQQHFW 9  5HSODFH 'ULYHU 3&% 7HVW %XWWRQ Check Voltage about 200V past 30second after turn on Test Mode Comp Ref.
  • Page 57 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 IPM Output check - Measure the voltage between the POWER and COMM pins of the connector as shown below.
  • Page 58 12-2 Check B Protection Logic B1. LED blinks once, then repeats (FCT0 Fault) 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 59 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 60 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 61 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 62 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 63 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 -87- - 87-...
  • Page 64 LED operating condition Cause Service guideline 1. . Please check, Wheth 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 actio Connector You check on normal miss...
  • Page 65 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 66 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 67 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 68 3. ICE MAKER (Freezer Room) OPERATING METHOD AND TROUBLE SHOOT 13-1 Working Principles 13-1-1 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 69 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 70 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 71 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 72: Description Of Function & Circuit Of Micom

    14. 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 73 14-1-8 Defrosting (removing frost) Defrosting starts each time the COMPRESSOR running time Betwee 7~50 hours. 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) Defrosting won’t function if its sensor is defective (wires are cut or short circuited) 14-1-9 Defect Diagnosis Function...
  • Page 74 249D 408A 249C 406B 312A 332C 310B 323B 405H 309B 329C 404A 105A 106A 308B 405P 420A 329A 312C 405F 405C 610E 319A 315B 315C 315B 315C Copyright © 2018-2019 LG Electronics Inc.All righ reserved. Only training and service purpose...
  • Page 75 133C 145C 131A 146C 136C 136B 133A 132P 145F 237C 136A Copyright © 2018-2019 LG Electronics Inc.All rights reserved. Only training and service purposes.
  • Page 76 139A 141A 141A 139A 161C 141D 151A 146B 151B 162B 146C 145D 162A Copyright © 2018-2019 LG Electronics Inc.All right reserved. Only training and service purposes...
  • Page 77 262C 244A 243A 243E 244A 262E 243C 409B 262C 158C 243B 253A 250B 250A 249E 250B 201A 200A 249J 206K 407G HW76 203A 206L 212D 249F 249K Copyright © 2018-2019 LG Electronics Inc.All rights reserved. Only training and service purposes.
  • Page 78 616E 627A 623A 619A Copyright © 2018-2019 LG Electronics Inc.All right reserved. Only training and service purpose...
  • Page 79 Freezer Room 600A 600B Copyright © 2018-2019 LG Electronics Inc.All righ reserved. Only training and service purpose...
  • Page 80 P/No. MFL68744254 Nov., 2018 Printed in Korea...

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