LG LFX25960ST Service Manual
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LG LFX25960ST Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODEL: LFX25960ST
LFX25960SW
LFX25960SB
LFX25960TT
LFX21960ST
LFX21960SW
LFX21960SB
LFX21960TT
website : http://biz.lgservice.com
COLOR: STAINLESS
SUPER WHITE
WESTERN BLACK
TITANIUM

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  • Page 1 : http://biz.lgservice.com REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MODEL: LFX25960ST LFX21960ST COLOR: STAINLESS LFX25960SW LFX21960SW SUPER WHITE LFX25960SB LFX21960SB WESTERN BLACK LFX25960TT LFX21960TT TITANIUM...

  • Page 2: Table Of Contents

    CONTENTS Safety Precautions 1. Specification ..................................2. Parts Identification ................................3. Operation ....................................3-1. Explanation of Each Function ............................3-2. Ice Maker Function................................4. Wiring Diagram ..................................5. Adjustment.................................... 5-1. Compressor..................................5-2. Positive Temperature Coefficient (PTC) – Starter ......................5-3. Over Load Protector (OLP) ............................. 5-4.

  • Page 3: Specification

    1. SPECIFICATIONS 21 cu. ft. / 25 cu. ft. ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DOOR DESIGN Side Rounded VEGETABLE TRAY Opaque Drawer Type DIMENSIONS (inches) H) 21cu.ft COMPRESSOR Recipro H) 25cu.ft EVAPORATOR Fin Tube Type 302.58 (21cu.ft) CONDENSER Wire Condenser NET WEIGHT (pounds) 324.18 (25cu.ft) REFRIGERANT R-134a (125 g)

  • Page 4: Parts Identification

    2. PARTS IDENTIFICATION Refrigerator Light Tilt-Out Door Basket Ice Bank Filter (Inside) Durabase Ice Door Modular Door Bins Divider Refrigerator Shelves Ice Bin Supra Fresh Crisper with Water Tank Cover Tilt-Out Compartment Snack Pan Ice Room Egg Box (ICEMAKER and ICE BIN) Dairy Bin Pull out Drawer Bottle Holder...

  • Page 5: Operation

    3. OPERATION 3-1. Explanation Of Each Function 1. Function (1) When the appliance is plugged in, it is set to 37 °F for the refrigerator and 0 °F for the freezer. You can adjust the refrigerator and the freezer control temperature by pressing the ADJUST button. (2) When the power is initially applied or restored after a power failure, maintains its previously set temperature.
  • Page 6 5. Ice Plus Selection Please select this function for quick freezing. (1) The ICE PLUS option starts counting its 24-hours period every time the button is pressed. (2) The ICE PLUS function automatically turns off after twenty-four hours pass. 6. Dispenser Use Selection You can select water or ice.
  • Page 7 11. Ice Plus (1) The purpose of this function is to intensify the cooling speed of freezer and to increase the amount of ice. (2) Whenever selection switch is pressed, selection/release, the LED will turn ON or OFF. (3) If there is a power outage and the refrigerator is powered on again, Ice Plus will be canceled. (4) To activate this function, press the Ice Plus key and the LED will turn ON.
  • Page 8 14. Defrosting (removing frost) (1) Defrosting starts each time the COMPRESSOR running time reaches 7 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 2 hours, the defrost mode is malfunctioning.

  • Page 9: Ice Maker Function

    3-2. Ice Maker Function 1. Operation Principle of icemaker Power On Start Position • Adjusts EJECTOR to Start Position with power on. Icemaking • Waits until water becomes ICE after starting the Mode icemaking operation. Harvest • Runs MOTOR to drop ice from the tray into the ICE BIN. Mode (During harvest mode, check if the ice bin is full.) Park Position...
  • Page 10 2. Icemaking Mode (1) Icemaking refers to the freezing of supplied water in the ice tray. Complete freezing is assured by measuring the temperature of the tray with Icemaking SENSOR. (2) Icemaking starts after completion of the water fill operation. (3) The icemaking function is completed when the sensor reaches 1 9 °∆F (-7 °∆C), 55 minutes after starting.
  • Page 11 5. Function TEST (1) This is a forced operation for test, service, cleaning, etc. It is operated by pressing and holding the cube size button for 3 seconds. (2) The test works only in the Icemaking Mode. It cannot be entered from the Harvest or Fill mode. (3) Caution! Caution! Caution! Caution! If the test is performed before water in the icemaker is frozen, the ejector will pass through the water.

  • Page 12: Wiring Diagram

    4. WIRING DIAGRAM - 12 -...

  • Page 13: Adjustment

    5. ADJUSTMENT 5-1. Compressor 1. Role The compressor intakes low temperature and low pressure gas from the evaporator of the refrigerator and compresses this gas to high-temperature and high-pressure gas. It then delivers the gas to the condenser. 2. Composition The compressor includes overload protection.
  • Page 14 4. diagnosis (Rated Voltage Remove PTC-Starter Power Source. ±10%)? from Compressor and measure voltage between Terminal C of Compressor and Terminal 5 or 6 of PTC. OLP disconnected? No Voltage. Replace OLP. Check connection condition. Reconnect. Applied voltage isn't Advise customer that in acceptable range.

  • Page 15: Positive Temperature Coefficient (Ptc) - Starter

    5-2. Positive Temperature Coefficient (PTC) – Starter 1. Composition (1) PTC (Positive Temperature Coefficient) is a no-contact semiconductor starting device which uses ceramic material consisting of BaTiO3. (2) The higher the temperature is, the higher the resistance value. These features are used as a starting device for the motor.

  • Page 16: Over Load Protector (Olp)

    5-3. Over Load Protector (OLP) 1. Define (1) The OLP (OVERLOAD PROTECTOR) is attached to the Compressor and protects the motor by opening the circuit to the motor if the temperature rises and activating the bimetal spring in the OLP. (2) When high current flows to the compressor motor, the Bimetal works by heating the heater inside the OLP, and the OLP protects the Motor by cutting off the current flowing to the Compressor Motor.

  • Page 17: Troubleshooting

    6. TROUBLESHOOTING 6-1. Error Code Summary w w WARNING : When you check the Resistance values, be sure to turn off the power. And wait for the voltage-discharge sufficiently. Error Display Error Detection Error Generation Factors Remark Freezer Ref. Category Temperature Temperature Normality...

  • Page 18: Troubleshooting With Error

    6-2. Troubleshooting With Error Freezer Sensor Err or Disconnect CON6 and measure Replace Is Er-FS dis played? the value. Is resistance value F-sensor between pins 11 & 12 of CON6 as below? (BL to BL) pin12 pin11 Is the connection loose? Reconnect Test Point Result...
  • Page 19 Refrigerator Sensor Error Wiring dia gram Disconnect CON6 and measure Replace Is Er-rS displayed? the value. Is resistance value R-sensor between pins 9 & 10 of CON6 as below? (WH to WH) pin10 pin9 Is the connection loose? Reconnect Tpin10 pin9 Result pin9 to pin10 6 ~ 300 k‰...
  • Page 20 Defrost Sensor Error D-Sensor CON6 Main PCB Housing-A Wiring dia gram Is resistance value between Is Er-dS displayed? Replace a pins 1 & 2 of Housing- A as D-Sensor below? (BO to BO) pin2 Is the connection loose? Reconnect pin1 Checking Open or Short of wire Test Point Result...
  • Page 21 Icing Room Sensor Error Icing-Sensor CON101 Display Housing-A Wiring diagram Is Er-IS displayed? Is resistance value between Replace the pins 1 & 2 of Housing- A as Icing-Sensor below? (BL to BL) Is the connection loose? Reconnect pin1 BL pin2 BL Display PCB Inner of Icing door Checking Open or Short of wire...
  • Page 22 Defrost Heater Error D-Sensor FUSE-M Main DEF-Heater Housing-A CON6 CON3 Wiring dia gram Enter the TEST 3 MODE Replace Is Er-dH displayed? Is the voltage value MAIN PCB between pins 10 (WH) and 4 (BL) of CON3 115 V AC? pin10 WH pin4 BL Is the connec tion loose?
  • Page 23 Replace Is the resistance value Normal Is the resistance value of Heater between pins 10(WH) heater like as below? And 4(BL) of CON3 like as below? pin10 WH pin4 BL Resistance Test Point Ressult Heater Resistance 34 ~ 42 Ω (1) To (2) Test Point Ressult...
  • Page 24 Freezer Fan Error Main F-FAN CON4 Housing Wiring diagram Is Er-FF displayed? Does the cold-air come out Check fan motor of the top of the main duct? (Connector, Frozen,Locked) Is the connection loose? Reconnect Is the feedback voltage Replace between pin2 and pin3 of Main PCB CON4 like as below? (from motor to main board)
  • Page 25 Condenser Fan Error CON4 C-FAN Main PWB Housing Wiring diagram Check fan motor Is Er-CF displayed? Is the condenser fan (Connector, rotate? Locked,mouse) Is the connection loose? Reconnect Is the feedback voltage Replace between pin8and pin9 of Main PCB CON4 like as below? (from motor to main board) Reset and Replace...
  • Page 26 Icing Room Fan Error Icing Main PWB Housing CON4 Wiring diagram Is Er-IF displayed? Does the cold-air come out Check fan motor of the side duct? (Connector, Frozen,Locked) Is the connection loose? Reconnect Is the feedback voltage Replace between pin5 and pin6 of Main PCB CON4 like as below? (from motor to main board)
  • Page 27 Communication Error Hinge CON5 RD(Rx) CON101 RD(Tx) BN(Tx) BN(Rx) MAIN DISPLAY BO(GND) BO(GND) WH/BK(12V) WH/BK(12V) * Rx: Receiver Wiring diagram Tx: Transmitter Is Er-CO displayed? Display PCB Replace Is the voltage between Display PCB pin3 and pin5 of CON101 0 V or 5 V? Display PCB Reconnect Pin5 BO...
  • Page 28 Main PCB Replace Main PCB Reconnect Is the connection loose? Main PCB Is the voltage between pin2 and pin4 of CON5 0 V or 5 V? pin2 BO pin4 RD Main PCB Replace the Transmitter Voltages Is the voltage between Main PCB pins 2 and pin 3 of Test Point...

  • Page 29: Troubleshooting Else

    6-3. Troubleshooting Else CUBE Mode doesn’t work Housing-A CON2 CUBE Solenoid Dispenser Auger Motor Lever S/W Housing-B CON3 Solenoid Dispenser Wiring diagram Replace Dispenser PCB In CUBE Mode, Reconnect Dispenser Is the connection loose? Is the voltage between pin3 of CON2 and pin3 of CON3 like as below, while pushing the lever switch? CON2...
  • Page 30 Replace Replace Is the resistance value In CUBE Mode, Dispenser Auger Motor between (1) and (2) of the Is the voltage between pin5 of CON2 and pin3 of CON3 Auger motor like as below? like as below, while pushing the lever switch? CON2 Pin5 SB (1 )(2 )
  • Page 31 Replace Is the resistance between Dispenser (1) and (2) of the Dispenser Solenoid solenoid like as below? Resistance of Dispenser solenoid Level switch Result (1) to (2) 44 ~54 ½ Replace Is the condition of Micro the micro switch like as Switch below? Status...
  • Page 32 Crush Mode Doesn't work CON2 Auger Motor Dispenser Lever S/W Housing-B CON3 Solenoid Dispenser Wiring diagram Replace Display PCB In Crush Mode, Reconnect Dispenser Is the connection loose? Is the voltage between pin5 of CON2 and pin3 of CON3 like as below, while pushing the lever switch? CON2 Pin5 SB...
  • Page 33 Replace Replace In CUBE Mode, Is the voltage between (1) Dispenser Dispenser Is the voltage between pin7 and (2) of the Dispenser Solenoid of CON2 and pin9 of CON3 solenoid like as below? like as below, while pushing the lever switch? CON2 Pin7 BL CON2...
  • Page 34 Crush Mode Doesn't work Lever S/W Dispenser Door Water Valve Housing-A CON2 Machine Room Main Water Valve Housing-B CON3 Wiring diagram Replace Display PCB In Water Mode, Reconnect Dispenser Is the connection loose? Is the voltage between pin1 and pin7 of CON2 in dispenser PCB like as below, while pushing the level switch?
  • Page 35 Replace In Water Mode, Second Water- valve Replace Second Is the voltage between Is the resistance value of Main PCB Water-valve pin4 and pin11 of CON3 in Second-water valve like as main PCB like as below, below? while pushing the level switch? Main PCB CON3...
  • Page 36 Freezer-lamp Doesn’t work F-DOOR Switch Main PCB F-Lamp Housing CON6 CON3 Wiring diagram Is the condition of Is the voltage between pin 11 Replace Replace the freezer door switch and 12 of CON6 like as Door switch Main PCB like as below? below? AC Part DC Part...
  • Page 37 Refrigerator-lamp Doesn’t work MAIN R-DOOR Switch R-Lamp CON3 CON4 Housing Hinge Wiring diagram Is the condition of Is the voltage between pin10 Replace Replace the refrigerator door and pin11 of CON4 like as Door switch Main PCB switch like as below? below? CON4 Pin11 GY Pin10 GY...
  • Page 38 Poor cooling in the refrigerator compartment MAIN PWB Is the voltage between Replace the Replace Is the connection loose? pins 1 and pin 2 of CON4 Main PCB like as below? Pin1 WH Pin2 BK CON4 Voltage of F-fan CON3 Test Point Result pin1 to pin2...
  • Page 39 Does the cold-air come out Check the After reset the unit, take steps to PCB as follows of the top of the main duct? Damper itself for temperature compensation. 1. In the case of 6871JB1431 ( by July 2007) : Compensate with replacing RCR1 RCR1 Temp.
  • Page 40 Over cooling in the refrigerator compartment MAIN PWB Enter the TEST 2 MODE Check the Reconnect Is the connection loose? Does the cold-air coming out Damper itself of the top of the main duct.? CON3 Enter the TEST 1 MODE Checking Damper itself Replace Replace...
  • Page 41 Enter the TEST 3 MODE Replace After reset the unit, take steps to PCB as follows Is the voltage between Damper for temperature compensation. Pins 4 and pin 12 of CON3 like as below? 1. In the case of 6871JB1431 ( by July 2007) : Compensate with replacing RCR1 CON3 Pin12...
  • Page 42 (NOTE) 1. How To Remove Terminal Position 3. How To Start Test Mode Assurance (TPA) Push the TEST button on the Main PWB, You can start the TEST MODE. * AC TPA TEST BUTTON * DC TPA After measure the values, you should put in the TPA again.
  • Page 43 4. How to check the Fan-Error (1) 6871JB1431A ( ~ July 2007) 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 44: Component Testing Information

    7. COMPONENT TESTING INFORMATION 7-1. Defrost Controller Assembly Function - Controller assembly is consist of 2 kinds of part those are fuse-m and sensor. we can decide part is defect or not when we check the resistance. - Fuse-m can cut off the source when defrost heater operate the unusual high temperature.

  • Page 45: Sheath Heater

    7-2. Sheath Heater Function Sheath heater is a part for defrost. All heating wire is connected to only one line. So we can decide part is defect or not when we check the resistance. How to Measure Set a ohmmeter connect to The 2 housing pin. Measure the 2 pin connected to Sheath Heater.

  • Page 46: Door Heater Assembly

    7-3. Door Heater Assembly Function The heater is designed to prevent the raising dew from door. How to Measure Standard Test Point Ressult 2.3 ~2.9 Ω (1) to (2) - 46 -...
  • Page 47 7-4. Door Switch Function The switch sense if the door open or close. - 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 48: Solenoid

    7-5. Solenoid Function - Dispenser solenoid : When customer push the dispenser button, Pull duct door and abstract from ice bank. How to Measure Dispenser Solenoid Standard Dispenser Solenoid Test Points Result 44 ~ 54 Ω (1) to (2) - 48 -...

  • Page 49: Ac Motor Assembly

    7-6. AC Motor ASSEMBLY (Geared Motor & Solenoid) Function The Geared Motor of ac motor assembly advances forward the ice by rotating the ice and The solenoid of ac motor assembly selects one of the cube mode or crush mode. - Cube solenoid : Pulling the stir lip for moving the ice in ice maker system.

  • Page 50: Damper

    7-7. Damper Function The damper supplies the cold air at freezer room to chillroom by using the damper’s plate. Chillroom is colder than before when damper’s plate is open. When damper’s plate is close, chillroom’s temperature will rise. How to Measure <...

  • Page 51: Lamp Socket

    7-8. Lamp Socket Function The lamp socket connect cover lamp assembly to lamp. The lamp socket fix lamp and unite lamp and cover lamp assembly. The lamp socket supply electric source to lamp also. How to Measure Check the resistance between connector of housing and connector of lamp socket.
  • Page 52 7-9. Water Valve Function - first-Water Valve (in machine room) : supply the water from city water to water filter in refrigerator - second-Water Valve (in door) : supply the water from water filter to icemaker and dispenser How to Measure Dispense Ice Maker...

  • Page 53: Disassembly Instructions

    8. DISASSEMBLY INSTRUCTIONS 8-1 REMOVING AND REPLACING REFRIGERATOR DOORS Removing Refrigerator Door w w CAUTION: Before you begin, unplug the refrigerator. Remove food and bins from doors. u u Left Door - Figure 2 2. Open the door. Loosen the top hinge cover screw (1). Use a flat tip screwdriver to pry back hooks on front underside of the cover (3).
  • Page 54 8-2 DOOR Door Gasket Replacement 1. Insert gasket bracket clips Door Gasket Removal 1) Insert the gasket bracket edge beneath the door 1. Remove door frame cover frame edge. Starting at the top of cover and working down, 2) Turn the upper gasket bracket spring so that the snap the cover out and away from the door.
  • Page 55 2) Press the gasket into the channels on the three 8-3 DOOR ALIGNMENT remaining sides of door. If the space between your doors is uneven, follow the instructions below to align the doors: 1. With one hand, lift up the door you want to raise at the the middle hinge.
  • Page 56 * Ice Fan Scroll Assembly Replacement 8-6 LAMP 1) Remove the plastic guide for the slides on left side by unscrewing the phillips head screws. 2) Pull the grille forward as shown in the second picture. 3) Disconnect the wire harness of the grille 4) Remove the scroll assembly by loosening 2 screws Figure 14 8-6-1 Refrigerator Compartment Lamp...
  • Page 57 8-8 MULTI DUCT 2) Remove display frame assembly by making a gap 1. Remove the upper and between the display frame lower aps by using a assembly and door flat screwdriver, and with a flat blade screwdriver remove 2 screws. and pulling it forward.
  • Page 58 8-13 SUB PWB FOR WORKING DISPENSER 8-15 ICE CORNER DOOR REPLACEMENT 1) Loosen the screw on the sub PCB. 1) Loosen the front screw as shown in the picture. 2) Lift up the hinge with one hand. 3) Pull out the Ice Corner Door with the other hand. hinge 2) Pull the sub PCB down.
  • Page 59 8-17 AUGER MOTOR COVER 1) After removing the icemaker remove the (5) stainless screws holding the auger motor cover, shown in the picutres below. 2) Grip the bottom of the motor cover assembly and pull out it. 3) Disconnect the wire harness of the motor cover assembly.
  • Page 60 8-18 HOW TO REMOVE THE DOOR ICE BIN 8-19 HOW TO INSERT THE DOOR ICE BIN 1) Grip the handles, as shown in the picture. 1) Insert the Ice Bin, slightly tilting it to avoid touching the icemaker. particularly the feeler arm lever. 2) Lift the lower part slightly.
  • Page 61 8-20 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER 8-20-1 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) Lift the freezer door up to unhook it from the rail from each side).
  • Page 62 8-20-2 Follow Steps to Reinstall Step 1) Reinstall the right side gear into the clip. Step 2) Insert the rail into the right side gear. Gears do not Step 3) Insert the rail into the left side gear, and insert the need to be perpendicular to each other.
  • Page 63 8-21. WATER VALVE DISASSEMBLY METHOD 8-22. FAN AND FAN MOTOR DISASSEMBLY METHOD 1) Using a short screwdriver, loosen one SCREW in 1) Turn off the water. Then separate the water line from the DRAIN PIPE ASSEMBLY and one connected to the valve.
  • Page 64 8-23 PULL OUT DRAWER To separate the drawer, push the front left and right hooks in direction to pull up and remove. Then gently lift the gear part of rear left and right side of the drawer and pull it out in direction.

  • Page 65: Pcb Assembly

    9. PCB ASSEMBLY 9-1. Main PCB Assembly 6871JB1431 (by July 2007) CON5 CON4 CON6 CON7 CON1 CON3 CON2 - 65 -...
  • Page 66 EBR34917102 (from Aug 2007) CON5 CON4 CON6 CON7 CON3 CON1 CON2 - 66 -...

  • Page 67: Display Pcb

    9-2. Display and Dispenser Drive PCB Assembly CON101 CON103 CON102 Display PCB CON4 CON1 CON4 CON2 CON3 Dispenser PWB - 67 -...

  • Page 68: Exploded View

    10. EXPLODED VIEW CASE PARTS CAUTION: Use the part number to order part, not the position number. 607A 207B 626A 402A 624D 103B 103A 624C 271A 410A 207A 271B 207C 409D 624A 610B 406D 501F 402A 610B 120A 271C 503D 282F 410G 271D...
  • Page 69 FREEZER PARTS CAUTION: Use the part number to order part, not the position number. 250C 250D 145C 250E 250D 250C 136B 145G 145J 131A 145K 145F 145M 145J 145H 237C 136A - 69 -...
  • Page 70 REFRIGERATOR PARTS CAUTION: Use the part number to order part, not the position number. 141B 141A 141B 141A 141C 141B 141A 141C 141B 140A 141C 141D 167B 140C 140B 154A 140D 160B 154B 151C 151F 151D 151E 151A 151D 151F : on some models - 70 -...
  • Page 71 DOOR PARTS CAUTION: Use the part number to order part, not the position number. 230B 241A 231B 233B 233C 241C 241B 230A 234D 234B 233D 233A 231A 234C 212G 234A 147C 147B 147A 241D 146A 241G 241E 243C 262C 243A 243C 237A 243B...
  • Page 72 DISPENSER PARTS CAUTION: Use the part number to order part, not the position number. 278A 278C 402C 278B 276A 275A 278F 278D 405A 500B 501A 276B 279D 279E 279B 279C 280B 280C 281A 279A - 72 -...
  • Page 73 ICE and ICEMAKER PARTS CAUTION: Use the part number to order part, not the position number. 617A 625A 616G 616D 616G 623B 616H 623B 616H 616F 627A 603A 616D 619A 619E 603B - 73 -...
  • Page 74 ICE BIN PARTS CAUTION: Use the part number to order part, not the position number. 606A 600B 630J 600A 611A 630F 630B 630C 630A 630K 630M 630H 614A 630E 630N 630D 630G 630L - 74 -...
  • Page 75 P/No. 3828JL8795A APR., 2006 Printed in Korea...

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