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LG LFX23961SW /01 Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODELS:
LFX23961SW /01
LFX23961ST /01
LFX23961SB /01

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  Summary of Contents for LG LFX23961SW /01

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MODELS: LFX23961SW /01 LFX23961ST /01 LFX23961SB /01...
  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ........................... 1. SPECIFICATIONS ............................2. PARTS IDENTIFICATION ..........................3. DISASSEMBLY ............................... 4. ADJUSTMENT ..............................5. CIRCUIT DIAGRAM ............................6. TROUBLESHOOTING ............................ 7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER ............. 8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ................9.
  • Page 3: Specifications

    1. SPECIFICATIONS LFX23961SW LFX23961ST LFX23961SB SPECIFICATIONS Color Super White Stainless Black 892 (W) x 925 (D) x 1860 (H) mm Dimensions Net Weight 124kg Capacity 23 cuft Refrigerant R134a (120gr) Climate class Temperate (N) Rated Rating 115V~ / 60Hz Cooling System Fan Cooling Temperature Control MICOM control...
  • Page 4: Parts Identification

    2. PARTS IDENTIFICATION Use this page to become more familiar with the parts and features. Page references are included for your convenience. NOTE: This guide covers several dierent models. The refrigerator you have purchased may have some or all of the items listed below.
  • Page 5: Disassembly

    3. DISASSEMBLY 3-1 DOORS 1. Removing Refrigerator Door NOTE: Handle appearance may vary. IMPORTANT: Before you begin, turn the refrigerator OFF and unplug it. Remove food and any bins from doors. Left Door Loosen the screws and remove the cove on back side (see figure A). Disconnect water supply tube by pushing back on the disconnect ring (3).
  • Page 6: Replacing Refrigerator Door

    2. Replacing Refrigerator Door Right Door Lower the door onto the middle hinge pin (9). Make sure the door is aligned with the cabinet. Replace the top hinge (8) installing hinge screws (7) to secure it. Make sure the gasket on the door is flush against the cabinet and is not folded. Support the door on the handle side while securing hinge.
  • Page 7: Door Gasket Removal

    3-2 REMOVING REFRIGERATOR HANDLE 3-4 DOOR GASKET REMOVAL 1. Remove door frame cover 1.Removing Refrigerator Handle Starting at top of cover and working down, snap cover • Loosen the set screws with the 3/32” Allen out and away from door. wrench and remove the handle.
  • Page 8: Door Gasket Replacement

    3-5 DOOR GASKET REPLACEMENT 1. Insert gasket bracket clips 2) Press gasket into channels on the three remaining sides of door. 1) Insert gasket bracket edge beneath door frame edge. 2) Turn upper gasket bracket spring so that the spring ends are in the door channel.
  • Page 9: Defrost Control Assembly

    3-7 FAN AND FAN MOTOR(EVAPORATOR) 3-8 DEFROST CONTROL ASSEMBLY Defrost Control assembly consists of Defrost Sensor and 1. Remove the freezer shelf. (If your refrigerator has an 2 FUSE—M. icemaker, remove the icemaker first) 2. Remove the plastic guide for slides on left side by The Defrost Sensor works to defrost automatically.
  • Page 10: Multi Duct

    3-9 LAMP 3-10 MULTI DUCT 1. Remove the upper and lower Caps by using a flat screwdriver, and remove 2 screws. 2. Disconnect the lead wire on the bottom position. 3-9-1 Refrigerator Compartment Lamp 1. Unplug Refrigerator, or disconnect power at the circuit breaker.
  • Page 11: Water Button Assmebly

    3-15 WATER BUTTON ASSMEBLY 1) Remove screws. 2) Grasp the Button assembly and lift up. Button Lever 4) If nozzle is interfered with button, 5) Remove the push and pull out the bottom of button connected part of lead wire. CAUTION: When replacing the dispenser cover in the reverse order of removal, be careful that the lead wire does not come out and the water tube is not pinched by...
  • Page 12: Auger Motor Cover

    3-19 AUGER MOTOR COVER 3-18 ICEMAKER ASSEMBLY 1) After removing the icemaker remove the (5) stainless 1) Loosen two screws as shown in the first picture. screws holding the auger motor cover, shown in the picutres below. 2) Disconnect the wire harness & ground screw replace 2) Grip the bottom of motor cover assembly and pull out it.
  • Page 13 3-20 HOW TO REMOVE A DOOR ICE BIN 3-21 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) Insert the ice bucket carefully avoid contacing the 2) Lift the lower part slightly.
  • Page 14 3-22 PULL OUT DRAWER (a) HOW TO INSTALL PULL OUT DRAWER • Align the top holes of the rail cover with the top holes of IMPORTANT: To avoid possible injury, product or the door supports to assemble the rail cover. property damage, you will need two people to perform the following instructions.
  • Page 15 (b) HOW TO REMOVE PULL OUT DRAWER When removing drawer door, do not hold it IMPORTANT: To avoid possible injury, product or by the handle. Door could fall down and you may be property damage, you will need two people to perform injured grasp door with both hands as pictured below the following instructions.
  • Page 16: Fan And Fan Motor Disassembly Method

    3-24 PULL OUT DRAWER 3-23 FAN AND FAN MOTOR DISASSEMBLY METHOD To remove, lift basket up and pull out straight out. 1) Using a short screwdriver, loosen one SCREW in DRAIN PIPE ASSEMBLY and one connected to the MOTOR COVER. MOTOR COVER To Install, pull both rails out to full extension.
  • Page 17: Adjustment

    4. ADJUSTMENT 4-2-3 PTC-Applied Circuit Diagram 4-1 COMPRESSOR 4-1-1 Role Starting Method for the Motor 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 LFX21980** OVERLOAD PROTECTOR delivers the gas to the condenser.
  • Page 18: To Remove The Cover Ptc

    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 DUCT - HTR F - LAMP F - FAN FRONT - HTR BARRIER - HTR ICING F - FAN OUT PLATE - HTR C - FAN FD - HTR THERMOSTAT R - DOOR S/W R - LAMPS CON4 SHEAT - HTR FUSE - M...
  • 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 T erminal C of Compressor and T erminal 5 or 6 of PTC. Reconnect. OLP disconnected? No Voltage. Check connection condition.
  • Page 21: Other Electrical Components

    6-2 OTHER ELECTRICAL COMPONENTS • 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 • 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 And 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: Ice Maker Functions

    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 & Circuit Of Micom

    8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM 8-1 FUNCTION 8-1-1 Display 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) When the power initially applied or restored after a power failure, it is set to Control temperature previously.
  • Page 29: Dispenser Light

    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 1. Water 1) Water Switch: Hold your cup in the dispenser for a fez seconds with pressing water switch to allow the last drops of water to fall into the cup.
  • Page 30: Ice Plus

    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 Icon 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 8-1-13 Defrosting (removing frost) 1. Defrosting starts each time theaccumulated COMPRESSOR running time is between 7:30 and 40 hours. This time is determinated by how often and how long the doors are opened. 2. For initial power on or for restoring power, defrosting starts when the compressor running time reaches 4 hours. 3.
  • Page 32 ERROR CODE on display panel ERROR CODE ITEM CONTENTS REMARKS FRZ TEMP REF TEMP Failure of Freezer Cut or short circuit wire. sensor Failure of Cut or short circuit wire. Refrigerator sensor Failure of defrost Cut or short circuit wire. Inspect Connecting sensor wires on each sensor...
  • Page 33: Test Mode

    8-1-15 TEST Mode 1. The T est 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 test button at main PCB controller. 3.
  • Page 34: Pcb Function

    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 Water Circuit Voltage between A & B LAMP-R CON 3 PIN 9 CON 3 PIN 4 115 Vac LAMP-F CON 3 PIN 7 CON 3 PIN 4 115 Vac FD-HTR CON 3 PIN 8 CON 3 PIN 4...
  • Page 36 To measure output of the fans on the control board check voltages between the pins for the following components: OUTPUT VOLTAGE PIN NUMBER PIN NUMBER MOTOR ON MOTOR OFF Freezing compartment fan Con4 Pin1 Con4 Pin2 13 VDC - 15 VDC 2 VDC or less Machine compartment fan Con4 Pin7...
  • Page 37 8-2-3 Temperature Sensor Circuit “LOCATED ON DISPLAY PCB” CONNECTOR 6 CONNECTOR 6 PIN 1 2 3 4 9 10 11 12 DISPLAY STEPPING F-DOOR D-SNR R-SNR F-SNR SENSOR MOTOR 12V GND RXD RESISTANCE OF FREEZER/Icing RESISTANCE OF REFRIGERATOR & TEMPERATURE SENSOR DEFROST SENSOR &...
  • Page 38: Refrigeration Compartment Stepping Motor Damper Circuit

    8-2-4 Refrigeration Compartment Stepping Motor Damper Circuit A reversible DC motor is used to open and close the damper. T o open the damper, push test button once. T o close the damper, push test button twice. To see connector 6 picture, refer to page 36. 8-2-5 Dispenser Drive Circuit Circuit Pin Number...
  • 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 REFRIGERATOR. FREEZER/REFRIGERA poor. SOURCE is 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 Check is FREEZER COOLING is 1. If FREEZER Make sure the DOOR TEMPERATURE is too TEMPERATURE is isattached. poor. REFRIGERATOR low. TEMPERATURE normal. is too low. Make sure that the 2. If amount of cool air FAN MOTOR is poor.
  • Page 41: Main Pwb Assembly And Parts List

    8-4 MAIN PWB ASSEMBLY AND PARTS LIST 8-4-1 Main PWB Assembly F-FAN ICING-FAN C-FAN R-DOOR STEPPING F-DOOR DISPLAY 5V TESTTX RX GND D-SNR R-SNR F-SNR MOTOR SENSOR CON4 CON6 CON7 CON5 CE12 CE10 TRANS TESTS/W ROCP STICKER EBR419561 C0N2 CON3 FD-HTR MAKER WATER...
  • Page 42 8-4-2 Dispenser Drive PWB Assembly - 42 -...
  • Page 43: Exploded View

    #EV# 9. EXPLODED VIEW CASE PARTS Caution: Use the part number to order part, not the position number. 281A 603B 402A 611D 103B 611C 103A 271C 282E 410A 409D 104E 501F 402A 503F 611E 271A 503D 282F 610A 501A 409B 120B 145B 411A...
  • Page 44 #EV# FREEZER PARTS Caution: Use the part number to order part, not the position number. 136B 131A 145C 248E 248F 145F 136A - 44 -...
  • Page 45 #EV# REFRIGERATOR PARTS Caution: Use the part number to order part, not the position number. 143E 140D 140B 143E 140E 140D 140B 143E 140D 140B 140E 143F 140E 142D 140B 142E 128A 103E 170A 128B 167B 103E 154A 151C 151A 151A 305D 155B...
  • Page 46 #EV# DOOR PARTS Caution: Use the part number to order part, not the position number. 241F 230B 230A 231B 233B 233C 233D 233A 231A 212G 233H 233G 233E 233F 244A 241C 244A 212J 212J 241G 241C 147A 147B 286A 286A 147C 262E 262E...
  • Page 47 #EV# DISPENSER PARTS Caution: Use the part number to order part, not the position number. 282G 113E 405H 113F 617A 280A - 47 -...
  • Page 48 #EV# ICE MAKER & ICE BANK PARTS Caution: Use the part number to order part, not the position number. 606A 630J 600A 600B 630F 630A 614A 630K 630H 630G - 48 -...
  • Page 49 #EV# VALVE & WATER PARTS Caution: Use the part number to order part, not the position number. 616B 617B 623B 623C 616K 616A 625A 627C 619D - 49 -...
  • Page 50 MFL62526017 DECEMBER, 2009 Rev. 01...

This manual is also suitable for:

Lfx23961st /01Lfx23961sb /01