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
COLOR: TITANIUM
WESTERN BLACK
SUPER WHITE
STAINLESS

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Summary of Contents for LG LFX25960ST

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

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ............................... 2 1. SPECIFICATIONS................................3 2. PARTS IDENTIFICATION ..............................4 3. DISASSEMBLY................................5-13 REMOVING AND REPLACING REFRIGERATOR DOORS ....................5 DOOR ....................................6-7 TO REMOVE THE DISPENSER ............................7 DOOR ALIGNMENT ................................7 FAN AND FAN MOTOR(Evaporator) ..........................7 ICE FAN SCROLL ASSEMBLY REPLACEMENT ......................8 DEFROST CONTROL ASSEMBLY ............................

  • Page 3: Specifications

    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 (Ice Maker and Ice Bank) Dairy Bin Pull out Drawer Bottle Holder...

  • Page 5: Disassembly

    3. DISASSEMBLY 3-1 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 -FIG. 2 1. Disconnect water supply tube by pushing back on the disconnect ring (4).-FIG. 1 2.

  • Page 6: Door

    3-2 DOOR Door Gasket Replacement 1. Insert gasket bracket clips Door Gasket Removal 1) Insert gasket bracket edge beneath door frame edge. 1. Remove door frame cover 2) Turn upper gasket bracket spring so that the spring Starting at top of cover and working down, snap cover ends are in the door channel.

  • Page 7: To Remove The Dispenser

    2) Press gasket into channels on the three remaining 3-3 DOOR ALIGNMENT 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 middle hinge.

  • Page 8: Ice Fan Scroll Assembly Replacement

    * Ice Fan Scroll Assembly Replacement 3-6 LAMP 1) Remove the plastic guide for slides on left side by unscrewing phillips head screws. 2) Pull the grille forward as shown in the second picture. 3) Disconnect wire harness of the grille 4) Remove the scroll assembly by loosening 2 screws Figure 14 3-6-1 Refrigerator Compartment Lamp...

  • Page 9: Multi Duct

    3-8 MULTI DUCT 2) Remove display frame assembly by making a gap between a display frame 1. Remove the upper and assembly and door with a lower Caps by using a flat flat blade screwdriver and screwdriver, and remove 2 screws. (Figure 17) pulling it forward.

  • Page 10: Sub Pwb For Dispenser, Duct Door Replacement, Ice Corner Door Replacement, Ice Maker Assembly

    3-13 SUB PWB FOR WORKING DISPENSER 3-15 ICE CORNER DOOR REPLACEMENT 1) Loosen the screw on the sub PWB. 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 PWB down.

  • Page 11: Auger Motor Cover, Auger Motor Replacement

    3-17 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 motor cover assembly and pull out it. 3) Disconnect wire harness of motor cover assembly. There is a auger motor on the back, as shown in the picture.

  • Page 12: Door Ice Bin

    3-18 HOW TO REMOVE A DOOR ICE BIN 3-19 HOW TO INSERT A 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. (especially, ice maker lever) 2) Lift the lower part slightly.

  • Page 13: How To Remove And Reinstall The Pullout Drawer

    3-20 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER 3-20-1 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 14 3-20-2 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 15 3-20. WATER VALVE DISASSEMBLY METHOD 3-21. 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 16 3-22 PULL OUT DRAWER o 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 17: Adjustment

    4. ADJUSTMENT 4-1 COMPRESSOR 4-2-3 PTC-Applied Circuit Diagram Starting Method for the Motor 4-1-1 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 LFX21960** OVERLOAD PROTECTOR delivers the gas to the condenser.

  • Page 18: Olp(Overload Protector)

    4-3 OLP (OVERLOAD PROTECTOR) 4-4 TO REMOVE THE COVER PTC 4-3-1 Definition of OLP (1) 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...

  • Page 19: Circuit Diagram

    5. CIRCUIT DIAGRAM - 19 -...

  • Page 20: Troubleshooting

    6. TROUBLESHOOTING 6-1 COMPRESSOR AND ELECTRIC COMPONENTS (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.

  • Page 21: Other Electrical Components

    6-2 OTHER ELECTRICAL COMPONENTS M Not cooling at all Check for open short or Compressor Cause incorrect resistance readings doesn't run. in the following components a. Starting devices Short, open, or broken. Poor contact b. OLP or shorted. Coil open or shorted. c.

  • Page 22: Service Diagnosis Chart

    6-3 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY No Cooling. • Is the power cord unplugged from the outlet? • Plug into the outlet. • Check if the power switch is set to OFF. • Set the switch to ON. •...

  • Page 23: Refrigeration Cycle

    6-4 REFRIGERATION CYCLE M Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE CAUSE REMARKS OF THE THE UNIT EVAPORATOR COMPRESSOR PARTIAL Freezer Low flowing sound of A little higher • Refrigerant level is low due LEAKAGE compartment and Refrigerant is heard and than ambient •...
  • Page 24 6-4-1 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 None Partial Pattern? Equalization Equalization Test Test Very Fast Very Slow Very Slow Very Fast Fast...

  • Page 25: Operation Principle & Repair Method Of Icemaker

    7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER 7-1 OPERATION PRINCIPLE 7-1-1 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.
  • Page 26 7-2 ICE MAKER FUNCTIONS 7-2-1. 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.
  • Page 27 7-2-4 Function TEST 1. This is a forced operation for TEST, Service, cleaning, etc. It is operated by pressing and holding the Fill Key for 3 seconds. 2. The test works only in the Icemaking Mode. It cannot be entered from the Harvest or Fill mode. 3.

  • Page 28: Description Of Function, Circuits & Error Codes

    8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM 8-1 FUNCTION 8-1-1 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 29 8-1-5 Ice Plus selection Please select this function for quick freezing. • Function is repeat Ice Plus Icon whenever pressing Ice Plus button. • Ice Plus function automatically turns off after a fixed time passes. 8-1-6 Dispenser use selection You can select water or ice. ∗...
  • Page 30 8-1-11 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.
  • Page 31 8-1-14 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 32: Error Code On Display Panel

    ERROR CODE on display panel Error Display Error Detection Error Generation Factors Remark Freezer Ref. Category Temperature Temperature Normality Normal operation of None Display Short or Disconnection Freezer Sensor Error of Freezer Sensor Short or Disconnection Refrigerator of Refrigerator Sensor Sensor Error Each Sensor have to check Short or Disconnection...
  • Page 33 8-1-16 TEST Mode 1. The Test mode allows checking the PCB and the function of the product as well as finding out the defective part in case of an error. 2. The test mode is operated by pressing two buttons at Display panel. 3.
  • Page 34 8-2 PCB FUNCTION 8-2-1 Power Circuit 1. Power is supplied to the control board at pin1 and 3 of connector #1. - 34 -...
  • Page 35 8-2-2 Load / Fan & Open Door Detection Circuit 1. Load Drive Condition Check To measure outputs of the control board, check voltages between the pins for the following components: Circuit Pin Number Pin Number Output Voltage I/Maker Pilot Valve Con3 Pin3 Con3 Pin2 115 VAC...
  • Page 36 2-2. Machine compartment fan Pin7 & 8 of con4 MOTOR OFF 2V or less MOTOR ON 13V~15V 2-3. Icing compartment fan Pin4 & 5 of con4 MOTOR OFF 2V or less MOTOR ON 13V~15V - 36 -...
  • Page 37 3. Open Door Detection Circuit Check Measurement Pin 4 & 5 of con4 Ref.Door Location Freezer/ Pin 5 & 6 of con5 Fre.Door Refrigerator Door Closed Open 8-2-3 Temperature Sensor Circuit RESISTANCE OF FREEZER/Icing RESISTANCE OF REFRIGERATOR & TEMPERATURE SENSOR DEFROST SENSOR &...
  • Page 38 8-2-4 Refrigeration Compartment Stepping Motor Damper Circuit A reversible DC motor is used to open and close the damper. To open the damper, push test button once. To close the damper, push test button twice. 8-2-5 Dispenser Drive Circuit Circuit Pin Number Pin Number Output Voltage...
  • Page 39 8-3 TROUBLESHOOTING PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION POWER 1. The whole 1. FREEZER/ Check if POWER SOURCE is Replace Main PWB SOURCE is REFRIGERATOR. FREEZER/REFRIGERA poor. poor. TOR DOOR IS OPEN and check display. 2. If LAMP is dim. Check visually.
  • Page 40 PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION COOLING is 1. If FREEZER Check is FREEZER Make sure the DOOR poor. REFRIGERATOR TEMPERATURE is TEMPERATURE is too isattached. TEMPERATURE normal. low. is too low. 2. If amount of cool air Make sure that the FAN MOTOR is poor.
  • Page 41 8-4 MAIN PWB ASSEMBLY AND PARTS LIST 8-4-1 Main PWB Assembly Connector7 Connector6 Connector5 Connector4 Test Switch Connector1 Connector2 Connector3 - 41 -...
  • Page 42 8-4-2 Dispenser Drive PWB Assembly Connector1 Connector2 Connector4 Connector3 - 42 -...

  • Page 43: Exploded View & Replacement Parts List

    9. EXPLODED VIEW & REPLACEMENT PARTS LIST CASE PARTS CAUTION: Use the part number to order part, not the position number. 607A 207B 626A 624D 402A 103B 271C 271B 624C 103A 410A 207A 207C 624A 409D 406D 501F 402A 271B 271A 503D 282F...
  • Page 44 FREEZER PARTS CAUTION: Use the part number to order part, not the position number. 250C 250D 145C 250A 250D 250C 136B 131A 145F 237C 136A - 44 -...
  • Page 45 REFRIGERATOR PARTS CAUTION: Use the part number to order part, not the position number. 141B 141A 141B 141C 141A 141B 141A 141C 141B 140A 141C 140C 140B 140D 161E 141D 161C 161A 154B 154A 167B 161D 160B 151C 161C 161D 161F 151A 161A...

  • Page 46: Door Parts

    DOOR PARTS CAUTION: Use the part number to order part, not the position number. 241A 241C 241B 230B 230A 231B 233B 233C 233D 233A 231A 234A 234B 212G 147C 147B 147A 241D 146A 241E 237A 262C 262C 241F 241G 243A 243A 243B 244A...
  • Page 47 DISPENSER PARTS CAUTION: Use the part number to order part, not the position number. 278A 278C 402C 278B 276A 275A 278F 405A 278D 501A 276B 279D 279E 279B 280B 280C 281A 279A - 47 -...
  • Page 48 ICE & MAKER PARTS CAUTION: Use the part number to order part, not the position number. 617A 625A 616G 616D 616G 623B 616F 616H 623B 616H 627A 603A 616D 619A 603B - 48 -...
  • Page 49 ICE BANK PARTS CAUTION: Use the part number to order part, not the position number. 606A 630J 600A 611A 630F 630B 630C 630A 630K 630M 630H 630E 630N 630D 630G 630L - 49 -...
  • Page 50 P/No. 3828JL8795A APR., 2006 Printed in Korea...

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