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LG LFX21971ST Service Manual
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LG LFX21971ST Service Manual

LG LFX21971ST Service Manual

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This Owner's Manual is provided and hosted by Appliance Factory Parts.
LG LFX21971ST
Owner's Manual
Shop genuine replacement parts for LG LFX21971ST
Find Your LG Refrigerator Parts - Select From 834 Models
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Summary of Contents for LG LFX21971ST

  • Page 1 This Owner's Manual is provided and hosted by Appliance Factory Parts. LG LFX21971ST Owner's Manual Shop genuine replacement parts for LG LFX21971ST Find Your LG Refrigerator Parts - Select From 834 Models -------- Manual continues below --------...
  • Page 2 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MODEL: LFX25971** COLOR: STAINLESS LFX21971**...
  • Page 3 CONTENTS SAFETY PRECAUTIONS ............................... 2 1. SPECIFICATIONS................................3 2. PARTS IDENTIFICATION ..............................4 3. DISASSEMBLY................................5-14 REMOVING AND REPLACING REFRIGERATOR DOORS ....................5 DOOR INSTALLATION ............................... 6 DOOR ....................................7-8 TO REMOVE THE DISPENSER ............................8 DOOR ALIGNMENT ................................8 FAN AND FAN MOTOR(Evaporator) ..........................8 ICE FAN SCROLL ASSEMBLY REPLACEMENT ......................9 DEFROST CONTROL ASSEMBLY ............................
  • Page 4 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 (135 g)
  • Page 5 2. PARTS IDENTIFICATION ADJUSTABLE REFRIGERATOR SHELVING Ice Bank The refrigerator compartment shelves are adjustable to Ice Door allow flexibility for storage needs. MODULAR DOOR 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 6 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 7 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 8 2) Press gasket into channels on the three remaining 3-4 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 9 * Ice Fan Scroll Assembly Replacement 3-7 LAMP Unplug Refrigerator, or disconnect power at the circuit 1) Remove the plastic guide for slides on left side by breaker. unscrewing phillips head screws. If necessary, remove top shelf or shelves. 2) Pull the grille forward as shown in the second picture. 3-7-1 Refrigerator Compartment Lamp 3) Disconnect wire harness of the grille 1) Release 2 screws.
  • Page 10 3-8 MULTI DUCT 1. Remove the upper and lower Caps by using a flat screwdriver, and remove 2 screws. (Figure 16) 2. Disconnect the lead wire 3) If nozzle is interfered with button , push and 4) Rmove the on the bottom position. pull out the bottom of button.
  • Page 11 3-14 WATER BUTTON ASSMEBLY 3-17 ICEMAKER ASSEMBLY 1) Romove screws. 1) Loosen two screws as shown in the first picture. 2) Grasp the Button assembly and lift up. Button Lever 2) Disconnect the wire harness & ground screw replace theIcemaker assembly in the reverse order of removal. 3-15 DUCT DOOR REPLACEMENT 1) Pull up and out on the dispenser cover to remove.
  • Page 12 3-18 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 13 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 14 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 15 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 16 3-21. WATER VALVE DISASSEMBLY METHOD 3-22. 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 17 3-23 PULL OUT DRAWER To remove the drawer, push the tabs located on the front inside surface of each rail. Next, gently lift the rear left and right sides of the drawer and pull it out. To reinstall, pull out both rails to full extension. Insert the end of rib in the bracket at left and right. Making sure that the guides at the front are lined up properly, gently push down on both sides.
  • Page 18 4. ADJUSTMENT 4-1 COMPRESSOR 4-1-1 Role 4-2-3 -Applied circuit diagram The compressor intakes low temperature and low pressure Starting method for the motor gas from the evaporator of the refrigerator and compresses ELECTRICAL AND DIMENSION DIAGRAM this gas to high-temperature and high-pressure gas. It then ELECTRICAL CONNECTION DIAGRAM delivers the gas to the condenser.
  • Page 19 4-3 OLP (OVERLOAD PROTECTOR) 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 20 5. CIRCUIT DIAGRAM - 19 -...
  • Page 21 6. TROUBLESHOOTING 6-1 COMPRESSOR AND ELECTRIC COMPONENTS (Rated voltage Remove TSD-Starter Power source. ±10%)? from compressor and measure voltage between terminal C of compressor and terminal 5 or 6 of TSD. OLP disconnected? No voltage. Replace OLP. Check connection condition. Reconnect.
  • Page 22 6-2 TSD AND OLP Normal operation of Separate TSD-Starter Observation value is compressor is from compressor and 115V/60Hz : 6.8Ω±30% measure resistance impossible or poor. between No. 5 and 6 of PTC-Starter with a tester. (Figure 19) Replace TSD- The resistance value Starter.
  • Page 23 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 24 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 25 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 Fast Very Fast...
  • Page 26 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 27 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 28 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 29 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 30 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 ACTIVE WATER BUTTON PUSH * Water switch: Hold your cup in the dispenser for a few...
  • Page 31 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 32 8-1-13 Defrosting (removing frost) 1. Defrosting starts each time the COMPRESSOR running time reaches 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°F(8°C) or more. If the sensor doesn’t reach 46°F(8°C) in 1 hours, the defrost mode is malfunctioning.
  • Page 33 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 34 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 test button at main PCB controller. 3.
  • Page 35 8-2 PCB FUNCTION 8-2-1 Power Circuit The secondary part of the TRANSFORMER is composed of the power supply for the display, the BLDC FAN Motor drive (15.5 V), the relay drive (12 Vdc) and the MICOM and IC (5 Vdc). The voltage for each part is as follows: VA1 is a part for preventing over voltage and noise.
  • Page 36 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 37 2-3. Machine compartment fan Pin8 & 9 of con4 MOTOR OFF 2V or less MOTOR ON 13V~15V 2-4. Icing compartment fan Pin5 & 6 of con4 MOTOR OFF 2V or less MOTOR ON 13V~15V - 36 -...
  • Page 38 3. Open Door Detection Circuit Check Measurement Pin 11 & 12 of con4 Ref.Door Location Freezer/ Pin 5 & 6 of con6 Fre.Door Refrigerator Door Closed Open 8-2-3 Temperature Sensor Circuit The upper circuit reads refrigerator temperature, freezer temperature, Icing sensor temperature and defrost sensor temperature for defrosting and the indoor temperature for compensating for the surrounding temperature into MICOM.
  • Page 39 8-3 RESISTANCE SPECIFICATION OF SENSOR RESISTANCE OF FREEZER/ICING RESISTANCE OF REFRIGERATOR & TEMPERATURE SENSOR DEFROST SENSOR & ROOM SENSOR - 20 ˚C 22.3 KΩ 77 KΩ - 15 ˚C 16.9 KΩ 60 KΩ - 10 ˚C 13.0 KΩ 47.3 KΩ - 5 ˚C 10.1 KΩ...
  • Page 40 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 41 8-2-6 LED in Refrigerator/Freezer room (Apply for LED Model) CON6 Circuit Pin Number Pin Number Output Voltage LED Module Con6 Pin14 Con6 Pin15 12 VDC - 40 -...
  • Page 42 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 43 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 44 8-4 MAIN PWB ASSEMBLY AND PARTS LIST 8-4-1 Main PWB Assembly - 43 -...
  • Page 45 8-4-2 Dispenser Drive PWB Assembly - 44 -...
  • Page 46 9. EXPLODED VIEW & REPLACEMENT PARTS LIST CASE PARTS CAUTION: Use the part number to order part, not the position number. 607A 207B 626A 402A 624D 103B 271C 271B 624C 103A 207A 207C 503E 624A 406D 501F 402A 271B 120A 409D 271A 282G...
  • Page 47 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 237C 145H 136A - 46 -...
  • Page 48 REFRIGERATOR PARTS CAUTION: Use the part number to order part, not the position number. 141A 147C 141B 147A 141A 141B 141C 141A 141B 141C 140A 141C 142D 142B 142A 161B 161C 141D 154A 151A 151B 151C 146E 161A 145E 162B 145D 162A : on some models...
  • Page 49 DOOR PARTS CAUTION: Use the part number to order part, not the position number. 241A 230B 241C 241B 230A 231B 233B 233C 233D 233A 231A 234D 234C 212G 234B 234A 241D 241D 241G 243C 243C 262C 262C 241E 241H 244A 243A 241J 243A...
  • Page 50 DISPENSER PARTS CAUTION: Use the part number to order part, not the position number. 276A 275A 405A 279G 279H 500E 279B 500D 501D 279J 402C 279K 278D 281B 279D 500C 281A 279E 279C 501A 279A - 49 -...
  • Page 51 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 616F 619A 619E 603B - 50 -...
  • Page 52 ICE BANK 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 - 51 -...
  • Page 53 P/No. MFL47317001 FEB., 2008 Printed in Korea...

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