LG GR-459GTCA Service Manual
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LG GR-459GTCA Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
MODEL: GR-459GTCA
http://biz.lgservice.com
Ref.No.
GR-459GTCA
COLOR : TITANIUM

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Summary of Contents for LG GR-459GTCA

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL. Ref.No. GR-459GTCA MODEL: GR-459GTCA COLOR : TITANIUM...

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ............................... 2 SERVICING PRECAUTIONS..............................3 SPECIFICATIONS................................... 4 PARTS IDENTIFICATION ............................... 6 INSTRUCTIONS FOR REVERSING DOOR SWING ......................7-9 DISASSEMBLY................................10-11 DOOR....................................10 DOOR SWITCH.................................. 10 REFRIGERATOR ROOM LAMP ............................10 FAN AND FAN MOTOR ..............................11 DEFROST CONTROL ASSY ............................. 11 HEATER, SHEATH &...

  • Page 3: Servicing Precautions

    SERVICING PRECAUTIONS Features of refrigerant (R600a) After the refrigerant (R600a) is completely discharged, repair any defective parts and replace the dryer. At any case you must use the • Achromatic and odor less gas. LOKRING for connecting or replacing any part in the cycle (No Fire, •...

  • Page 4: Specifications

    SPECIFICATIONS 1. Ref. No: GR-459GK/QJ ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 595(W)X665(D)X2000(H) REFRIGERATOR Transparent Shelf (2EA) NET WEIGHT (kg) COMPARTMENT Folding Shelf (1EA) COOLING SYSTEM Fan Cooling Wine Rack (1EA) TEMPERATURE CONTROL Micom Control Vegetable Container Cover (1EA) DEFROSTING SYSTEM Full Automatic Magic Crisper (1EA) Heater Defrost...
  • Page 5 3. Ref. No: GR-459GC ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 595(W)X665(D)X2000(H) REFRIGERATOR Transparent Shelf (3EA) NET WEIGHT (kg) COMPARTMENT Vegetable Container Cover (1EA) COOLING SYSTEM Fan Cooling Vegetable Container (1EA) TEMPERATURE CONTROL Micom Control Fresh Zone Container Cover (1EA) DEFROSTING SYSTEM Full Automatic Fresh Zone Container (1EA) Heater Defrost...

  • Page 6: Parts Identification

    PARTS IDENTIFICATION Lamp Dairy Corner Removable Glass Shelf Door Basket (2ea or 3ea) Moving Basket Wine Rack (Optional) Egg Tray Folding Shelf Door Basket (Optional) (Long or Half) Multi-air Flow Duct Water Tank (Optional) Vegetable Drawer Bottle Used to keep fruits Door Basket and vegetables, etc.

  • Page 7: Instructions For Reversing Door Swing

    INSTRUCTIONS FOR REVERSING DOOR SWING This refrigerator allows the owner to change the door When reversing the door swing : swing if desired. The hinging of the doors can be changed Read the instructions all the way through before starting. to the opposite side anytime you wish.
  • Page 8 1) Remove screws(3) after removing a CAP(2) from the " side of the refrigerator room HANDLE(1). Remove screws(2) on the bottom of the refrigerator room HANDLE(1). The freezer room HANDLE(5) may be also disassembled in a same may as the refrigerator room HANDLE(1).
  • Page 9 6) Take out the LEAD WIRE(17) assembly from the TOP COVER FRONT(13) and assemble it on left side. ! 7) Remove bolts(18) securing HINGE-U(19). Unscrew of the hinge pin(20). Place HINGE-U and seat hinge upside down and apply them to left side of the refrigerator. NOTE: Seat hinge to be placed under the HINGE- U(19).

  • Page 10: Disassembly

    DISASSEMBLY 1. DOOR 2. DOOR SWITCH Freezer Door 1) Unplug the power cord from the outlet. 2) Loosen five screws in upper part and disconnect Top 1) Refer to previous chapter "Instruction for Reversing Cover Front. Door Swing". 3) Disconnect Lead Wire from switch. 2) Pull out the Door Gasket to remover from the Door Foam Assy, F.

  • Page 11: Fan And Fan Motor

    4. FAN AND FAN MOTOR 6. HEATER, SHEATH & HEATER, CORD-L 1) Remove freezer drawers. In this refrigerator, Heater, Sheath & Heater, Cord-L are used for defrosting heater. During heating, the temperature 2) Remove two cap, screws and loosen two screws in of heater rises about 300~350°C.

  • Page 12: Adjustment

    ADJUSTMENT 1. COMPRESSOR 3) PTC-Applied Circuit Diagram According to Starting Method for the Motor 1) Role The compressor intakes low temperature and low pressure OVERLOAD gas evaporated from Evaporator of the Refrigerator, and PROTECTOR(O.L.P) condenses this gas to high temperature and high pressure gas, and then plays delivering role to Condenser.

  • Page 13: Olp (Over Load Protector)

    3. OLP (OVER LOAD PROTECTOR) CONTACTING POINT COVER 1) Definition of OLP (1) OLP (OVER LOAD PROTECTOR) is attached to the BIMETAL Hermetic Compressor and protects the Motor by cutting off current in Compressor Motor in case of over-rising temperature by Bimetal in the OLP. CONTACTING POINT (2) When over-voltage flows to Compressor motor, the...
  • Page 14 u u BETTER u u GOOD - 14 -...

  • Page 15: Troubleshooting

    TROUBLESHOOTING (Mechanical Part) 1. COMPRESSOR AND ELECTRIC COMPONENTS Power Remove the Relay Assy (Rating Voltage Source. from the Compressor ±10%)? and measure the voltage between Terminal C of Compressor and Terminals M or S of Relay Assy No Voltage. Applied voltage isn't Advise the customer in the range of Rating to use a regular...

  • Page 16: Relay Assy (Ptc And Olp)

    2. RELAY ASSY (PTC AND OLP) Normal operation of Check another Observation value is Compressor is 220V/50Hz : 22Ω±30% electric Separate the Relay Assy 115V/60Hz : 6.8Ω±30% impossible or poor. components. from Compressor and 240V/50Hz : 33Ω±30% measure the resistance 127, 220V/60Hz : between M and S with a 22Ω±30%...

  • Page 17: Another Electric Component

    3. ANOTHER ELECTRIC COMPONENTS Cooling is impossible Compressor Check if current flows to Cause. doesn't run. the following components. a. Thermistor Poor contacting. b. Starting devices Shorted or broken. Poor contacting c. OLP or shorted. d. Compressor coil Coil shorted. Replace Poor contacting e.

  • Page 18: Service Diagnosis Chart

    4. SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY Cooling is • Is the power cord unplugged from the outlet? • Plug to the outlet. impossible. • Check if the power switch is set to OFF. • Set the switch to ON. •...

  • Page 19: Refrigerating Cycle

    5. REFRIGERATING CYCLE Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE CAUSE REMARKS OF THE THE SET EVAPORATOR COMPRESSOR PARTIAL Freezer room and Low flowing sound of A little high • A little Refrigerant LEAKAGE Refrigerator Refrigerant is heard and more than •...
  • Page 20 General Control of Refrigerating Cycle ITEMS CONTENTS AND SPECIFICATIONS REMARKS WELDING (1) H 30 • Chemical Ingredients • Recommend H34 containing 34% Ag in the (1) • Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20% • Service Center. • Brazing Temperature: 710~840°C (2) Bcup-2 •...
  • Page 21 LOKRING TUBE JOINT LOKRING Figure 23. LOKRING ASSEMBLY JAWS BOLT TOOL Figure 24. LOKRING TOOL - 21 -...

  • Page 22: Micom Function & Pcb Circuit Explanation

    MICOM FUNCTION & PCB CIRCUIT EXPLANATION 1. FUCTION EXPOSITION 1) FUNCTION (1) When the appliance is plugged in, it is set to 2°C for the Refrigerator and -18°C for the Freezer. You can adjust the Refrigerator and the Freezer control temperature by pressing the FRZ. Temp button or REF. Temp button. (2) When the power is initially applied or restored after a power failure, it is automatically set to “-18°C/2°C”...
  • Page 23 2) MIRACLE ZONE (BEST MODEL) (1) You can select optimum temperature range depending on types of food stored. (2) 4 step of temperature selection including 1°C, -1°C, -3°C and -7°C is available. Vegetables & Fruits Fresh Meat Raw Fish Frozen Meat 3) SUPER FREEZING (1) It is the function which increases the cooling speed of freezer by continuously operating compressor and freezer fan.
  • Page 24 7) REFRIGERATOR LAMP AUTO OFF (1) To protect the risk of lamp heat, when Refrigerator door opens for 7 min., refrigerator lamp is auto off. 8) 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 4hours.
  • Page 25 10) DEFECT DIAGNOSIS FUNCTION (1) Automatic diagnosis makes servicing the refrigerator easy. (2) When a defect occurs, the buttons will not operate: but the tones, such as ding, will sound. (3) When the defect CODE removes the sign, it returns to normal operation (RESET). (4) The defect CODE shows on the Refrigerator and Freezer Display.
  • Page 26 u u BETTER : ON : OFF - Show ERROR CODE on display panel. Failure of Freezer Failure of Failure of defrost Failure of RT Item Poor of defrost sensor Refrigerator sensor sensor sensor (NOTE2) ERROR CODE All off All off All off All off All off...
  • Page 27 11) FUNCTION TEST (1) Function to check the testing function of PCB and refrigerator and to find where the trouble. (2) The test switch is on the MAIN PCB of refrigerator. TEST FUNCTION is released and RESET after MAX. 2hours regardless of TEST MODE. (3) If the buttons on TOP COVER is pushed during TEST MODE, Function is not operated and only BUZZER ring with "DING~"...
  • Page 28 2. FUNCTION DESCRIPTION 1) POWER CIRCUITS u BEST u GOOD/BETTER TRANS secondary side is composed of electric power circuits for RELAY driving electricity (12Vdc) and for supplying electricity to MICOM and IC (5Vdc). The voltage in each part is as follows. u BEST PARTS VOLTAGE...
  • Page 29 2) OSCILLATION CIRCUIT CIRCUIT for occurring CLOCK which motivates the internal local element of IC1 to transmit and receive an information and BASIC TIME for calculating time. Use a proper form for OSC 1. Because in case that SPECIFICATION is changed, the calculated time in IC1 is changed or IC1 isn't able to operate.
  • Page 30 4) LOAD/BUZZER OPERATION, DOOR OPENING SENSING CIRCUIT (1) LOAD OPERATION CHECK u BEST u GOOD/BETTER u BEST DEFROST DISPENSER LOAD COMP LAMP HEATER HEATER(OPTION) (OPTION) MEASURING POINT (IC6) NO.15 NO.13 NO.12 NO.11 NO.14 NO.16 Below 1V STATE u GOOD/BETTER DEFROST DISPENSER LOAD COMP...
  • Page 31 (2) DOOR OPENING PERCEPTION CHECK u BEST u GOOD/BETTER MEASURING POINT NO.38 OF IC 1 (MICOM) REFRIGERATOR DOOR CLOSE 5V(S/W of A , B is OFF state) OPEN 0V(S/W of A , B is ON state) - 31 -...
  • Page 32 (3)BUZZER OPERATION CHECK u GOOD/BETTER NOTE) In the cuse of Best model, BUZZER is in the LCD [Refer to DISPLAY CIRCUIT]. CONDITION Tone(Beep~) when the button Alam for open door MEASUREMENT on the display is pushed (beep-beep-beep) LOCATION 0.1s 0.5s 0.5s 0.5s IC1 ( A )
  • Page 33 5) TEMP SENSOR CIRCUITS u BEST u GOOD/BETTER The above circuit reads the surrounding temperature, DEFROSTING temperature and FREEZER temperature, REFRIGERATOR temperature, MIRACLE ZONE temperature into MICOM(IC1). OPEN or SHORT state of each SENSOR is as follows. SENSOR CHECK POINT NORMAL (-30°C~50°C) SHORT OPEN...
  • Page 34 6) SWITCH INPUT CIRCUIT The following circuit is a test switch input circuit for checking the refrigerator. u GOOD/BETTER u BEST 7) REFRIGERATOR DAMPER CIRCUIT u BEST u GOOD/BETTER 8) MIRACLE ZONE DAMPER CIRCUIT (BEST MODEL) u BEST MODEL - 34 -...
  • Page 35 9) TEMPERATURE COMPENSATION u BEST u GOOD/BETTER FREEZER ROOM REMARKS RESISTANCE VALUES(R1) TEMPERATURE COMPENSATION 180 kΩ +2.5°C COMPENSATE WARMLY 56 kΩ +2.0°C 33 kΩ +1.5°C 18 kΩ +1.0°C 12 kΩ +0.5°C 10 kΩ 0°C STANDARD 8.2 kΩ -0.5°C 5.6 kΩ -1.0°C 3.3 kΩ...
  • Page 36 • TEMPERATURE COMPENSATION OF REFRIGERATOR ROOM Modification resistance 470 Ω 2 kΩ 3.3 kΩ 5.6 kΩ 8.2 kΩ 10 kΩ 12 kΩ 18 kΩ 33 kΩ 56 kΩ 180 kΩ Current resistance 0.5 °C 1 °C 1.5 °C 2 °C 2.5 °C 3 °C 3.5 °C...
  • Page 37 10) LIGHTING CIRCUITS OF KEY BUTTON INPUT AND DISPLAY PARTS u BEST u GOOD/BETTER - 37 -...
  • Page 38 11) DISPLALY CIRCUIT u BEST - 38 -...
  • Page 39 u BETTER u GOOD - 39 -...

  • Page 40: Sensor Resistance Characteristics Table

    3. SENSOR RESISTANCE CHARACTERISTICS TABLE MEASURED TEMPERATURE RESISTANCE OF FREEZER SENSOR RESISTANCE OF DEFROST SENSOR, ROOM TEMPERATURE SENSOR -20°C 22.3kΩ 77kΩ -15°C 16.9kΩ 60kΩ -10°C 13.0kΩ 47.3kΩ -5°C 10.1kΩ 38.4kΩ 0°C 7.8kΩ 30kΩ +5°C 6.2kΩ 24.1kΩ +10°C 4.9kΩ 19.5kΩ +15°C 3.9kΩ...
  • Page 41 4. MAIN PWB ASS'Y AND PARTS LIST 1) MAIN PWB ASS'Y u BEST - 41 -...
  • Page 42 u GOOD/BETTER - 42 -...
  • Page 43 2) REPLACEMENT PARTS LIST u BEST - 43 -...
  • Page 44 u GOOD/BETTER - 44 -...
  • Page 45 3) PWB ASS'Y, DISPLAY AND PARTS LIST u BEST - 45 -...
  • Page 46 u BETTER u GOOD - 46 -...
  • Page 47 PWB circuit drawing- The PWB circuit drawing may change without notice. u BEST - 47 -...
  • Page 48 - 48 -...
  • Page 49 u GOOD/BETTER - 49 -...
  • Page 50 - 50 -...

  • Page 51: Exploded View

    EXPLODED VIEW & REPLACEMENT PARTS LIST Ref. No : GR-459GK/QJ The parts of refrigerator and the shape of each part are subject to change in different localities. 102A 103B 102B 103A 281B 411B 501F 406B 109C 411C 501K 407B 501A 120E 120A 158B...
  • Page 52 Ref. No : GR-459GR/QQ 102A 103B 102B 103A 281B 411B 501F 406B 109C 411C 501K 407B 501A 120E 120A 158B 409B Ring 120D 604F 610F 120B 405C 304A 282B 404A 401A 405A 329A 301A 5300AJ 330B 610E 109A 105A 108A 5300AF 411A 283B...
  • Page 53 Ref. No : GR-459GC 102A 103B 102B 103A 281B 411B 501F 406B 411C 109C 501K 503J 407B 501A 120E 120A 503H 503E 503G 503C 409B Ring 120D 604F 610F 120B 405C 304A 282B 404A 401A 405A 329A 301A 5300AJ 330B 610E 109A 105A...
  • Page 54 Ref. No : GR-459GK 230A 249B 249A 234C 234D 136E 281A 249C 146A 233A 136E 241A 212G 149E 141E 231A 235A 503A 149C 241B 503F 141D 141F 241C 503B 154B 114A 154A 154C 151E 241D 151B 167A 212A 210A 168A 200A 244A 203A...
  • Page 55 Ref. No : GR-459QJ 230A 249B 249A 234C 234D 136E 281A 249C 146A 233A 136E 241A 212G 149E 141E 231A 235A 503A 149C 241B 503F 141D 141F 241C 237A 503B 154B 114A 154A 237A 154C 151E 241D 151B 167A 212A 210A 168A 200A...
  • Page 56 Ref. No : GR-459GR 230A 249B 249A 234C 234D 281A 249C 136E 233A 241A 136E 212G 231A 235A 503A 241B 136E 503F 241C 503B 154B 114A 154A 241D 151B 125C 212A 210A 140A 200A 244A 203A 201A 205F 136A 145C 132B 132A 281D...
  • Page 57 Ref. No : GR-459QQ 230A 249B 249A 234C 234D 281A 136E 249C 233A 241A 136E 212G 231A 235A 503A 136E 241B 503F 241C 503B 154B 114A 154A 237A 241D 151B 125C 212A 210A 140A 200A 244A 203A 201A 205F 136A 145C 132B 132A...
  • Page 58 Ref. No : GR-459GC 230A 234C 234D 241A 281A 136E 233A 136E 241A 212G 231A 235A 136E 241B 241C 154B 154A 237A 241D 151B 125C 212A 210A 140A 200A 244A 203A 201A 205F 125A 281D 136A 241E 136B 207A 210A 136C 241E - 58 -...
  • Page 59 Ref. No : GR-459GK/GR 611A 611H 611J 611G 611P 611F 611E 611B 611R 611X 611C 611M 611Y 611Q 611N 611K - 59 -...

  • Page 60: Replacement Parts List

    P/No. 3828JD8564P AUG., 2003 Printed in Korea...

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