LG GR-M652Y*A Service Manual
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LG GR-M652Y*A Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
MODEL : GR-M652Y*A/M712Y*A
GR-M652Y*Y/M712Y*Y
GR-B652Y*B/B712Y*B
GR-B652Y*Y/B712Y*Y
GR-B652Y*C/B712Y*C
GR-M652Y*X/M712Y*X
GR-M652Y*Q/M712Y*Q
GR-B652Y*S/B712Y*S
GR-B652Y*Q/B712Y*Q
- 1 -

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Summary of Contents for LG GR-M652Y*A

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL. MODEL : GR-M652Y*A/M712Y*A GR-M652Y*X/M712Y*X GR-M652Y*Y/M712Y*Y GR-M652Y*Q/M712Y*Q GR-B652Y*B/B712Y*B GR-B652Y*S/B712Y*S GR-B652Y*Y/B712Y*Y GR-B652Y*Q/B712Y*Q GR-B652Y*C/B712Y*C - 1 -...

  • Page 2: Table Of Contents

    CONTENTS CONTENTS ..................................... 2 SERVICING PRECAUTIONS ..............................3 SPECIFICATIONS ................................4-5 PARTS IDENTIFICATION ..............................6-15 FEATURE CHART ................................6-15 WATER DISPENSER..............................16-17 HOME BAR ..................................18 DISASSEMBLY ................................19-20 DOOR ....................................19 DOOR SWITCH .................................. 19 FAN AND FAN MOTOR ..............................19 DEF' CONTROL ASM ................................

  • Page 3: Servicing Precautions

    SERVICING PRECAUTIONS Air Recharging in Compressor is over, add the quantity in grams of R-134a to the Test the refrigeration by connecting it electrically before refrigerant system. Remember that every system has an refilling operation. It is necessary to ascertain the function exact quantity of R-134a with a tolerance of 5 grams that of the motor-compressor and identify the defects...

  • Page 4: Specifications

    1. SPECIFICATIONS SPECIFICATIONS ITEMS GR-M712Y*A/ M712Y*X/ M712Y*Y, GR-B712Y*B/ B712Y*S GR-B712Y*Y/ B712Y*Q/ B712Y*C FREEZER NET CAPACITY REFRIGERATOR TOTAL DIMENSIONS (mm) 860(W) X 750.5(D) X 1794(H) 860(W) X 750.5(D) X 1794(H) NET WEIGHT (kg) FREEZER Knob Dial TEMPERATURE CONTROL REFRIGERATOR Micom Control Full Automatic DEFROSTING SYSTEM Heater Defrost...
  • Page 5 SPECIFICATIONS ITEMS GR-M652Y*A/ M652Y*X/ M652Y*Y, GR-B652Y*B/ B652Y*S GR-B652Y*C/ B652Y*Y/ B652Y*Q FREEZER NET CAPACITY REFRIGERATOR TOTAL DIMENSIONS (mm) 860(W) X 730.5(D) X 1794(H) 860(W) X 730.5(D) X 1794(H) NET WEIGHT (kg) FREEZER Knob Dial TEMPERATURE CONTROL REFRIGERATOR Micom Control Full Automatic...

  • Page 6: Parts Identification

    2. PARTS IDENTIFICATION 2-1. FEATURE CHART GR-M652Y*A/M712Y*A, GR-M652Y*X/M712Y*X FREEZER COMPARTMENT Lamp In-Door Ice Maker Shelf Freezer Temperature Control Dial Freezer Door Rack REFRIGERATOR COMPARTMENT Deodorizer Egg Storage Rack (Optional) Shelves Dairy Corner (Optional) Lamp Convertible Room Refrigerator Door Rack Vegetable Drawer...
  • Page 7 GR-M652Y*Y/M712Y*Y FREEZER COMPARTMENT Lamp In-Door Ice Maker Shelf Freezer Temperature Control Dial Freezer Door Rack REFRIGERATOR COMPARTMENT Egg Storage Rack Deodorizer (Optional) Shelves Dairy Corner (Optional) Lamp Convertible Room Refrigerator Door Rack Vegetable Drawer Vitamin Kit(optional) Levelling Screw Base Cover NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.
  • Page 8 GR-B652Y*Y/B712Y*Y FREEZER COMPARTMENT Lamp In-Door Ice Maker Shelf Freezer Temperature Control Dial Freezer Door Rack REFRIGERATOR COMPARTMENT Deodorizer (Optional) Shelves (Optional) Lamp Convertible Room Refrigerator Door Rack Vegetable Drawer Vitamin Kit(optional) Levelling Screw Base Cover NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.
  • Page 9 GR-M652Y*Q/M712Y*Q FREEZER COMPARTMENT Twigting Ice Serve Lamp Shelf Freezer Temperature Control Dial Freezer Door Rack REFRIGERATOR COMPARTMENT Deodorizer Egg Storage Rack (Optional) Shelves Dairy Corner (Optional) Lamp Convertible Room Refrigerator Door Rack Vegetable Drawer Levelling Screw Vitamin Kit(optional) Base Cover NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.
  • Page 10 GR-B652Y*Q/B712Y*Q FREEZER COMPARTMENT Twigting Ice Serve Lamp Shelf Freezer Temperature Control Dial Freezer Door Rack REFRIGERATOR COMPARTMENT Deodorizer (Optional) Shelves (Optional) Lamp Convertible Room Refrigerator Door Rack Vegetable Drawer Levelling Screw Vitamin Kit(optional) Base Cover NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.
  • Page 11 GR-B652Y*B/B712Y*B FREEZER COMPARTMENT Lamp In-Door Ice Maker Shelf Freezer Temperature Control Dial Freezer Door Rack REFRIGERATOR COMPARTMENT Deodorizer Water Tank (Optional) Shelves (Optional) Lamp Refrigerator Door Convertible Room Rack Vegetable Drawer Vita Light Levelling Screw Base Cover NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.
  • Page 12 GR-B652Y*S/B712Y*S FREEZER COMPARTMENT Lamp In-Door Ice Maker Shelf Freezer Temperature Control Dial Freezer Door Rack REFRIGERATOR COMPARTMENT Deodorizer Water Tank (Optional) Shelves (Optional) Lamp Refrigerator Door Convertible Room Rack Vegetable Drawer Vitamin Kit(optional) Levelling Screw Base Cover NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.
  • Page 13 GR-B652Y*P/B712Y*P Twigting Ice Serve FREEZER COMPARTMENT Lamp Shelf Freezer Temperature Control Dial Freezer Door Rack REFRIGERATOR COMPARTMENT Deodorizer Water Tank (Optional) Shelves (Optional) Lamp Refrigerator Door Convertible Room Rack Vegetable Drawer Vitamin Kit(optional) Levelling Screw Base Cover NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.
  • Page 14 GR-B652Y*C/B712Y*C FREEZER COMPARTMENT Freezer Temperature Lamp Control Dial Twigting Ice Serve Freezer Door Rack Shelf REFRIGERATOR COMPARTMENT Deodorizer (Optional) Egg Storage Rack Shelves (Optional) Lamp Convertible Room Refrigerator Door Rack Vegetable Drawer Vitamin Kit(optional) Levelling Screw Base Cover NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.
  • Page 15 GR-M652Y*C/M712Y*C FREEZER COMPARTMENT Freezer Temperature Lamp Control Dial Twigting Ice Serve Freezer Door Rack Shelf REFRIGERATOR COMPARTMENT Deodorizer (Optional) Egg Storage Rack Shelves (Optional) Dairy Corner Lamp Convertible Room Refrigerator Door Rack Vegetable Drawer Vitamin Kit(optional) Levelling Screw Base Cover NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.

  • Page 16: Water Dispenser

    2-2 WATER DISPENSER Putting The Water In The Water Tank Features 1. Open the cover cap and pour water into the water tank. Cover Cap DISPENSER GRILLE 2. Close the cover cap. Tank Cover Cap Cover 3. Make sure that the valve under the water tank is in position.
  • Page 17 Cleaning Water Tank Grille and Drip Tray 1. Remove the Cover. 1. Remove with the grille. 2. Clean the inside and outside of the water tank with 2. Wash the grille with a mild dishwashing detergent and rinse thoroughly under running water.

  • Page 18: Home Bar

    2-3 HOME BAR How to disassemble and assemble the ice access door (H/BAR Door) 1) Open the ice access door to carefully remove left rubber packing. 2) While pressing the hinge separated using a pointed tool (driver, drill), move it to the right and carefully separate the ice access door.

  • Page 19: Disassembly

    3. DISASSEMBLY 3-1 DOOR 3-2 DOOR SWITCH Freezer Door 1. To remove the door switch, pull out it with a ' ' type driver as shown in (figure 9). 1. Remove the hinge cover by loosening 1 screw and 2. Disconnect the lead wire from the switch. pulling it upwards.

  • Page 20: Def Control Asm

    3-4 DEF' CONTROL ASSY 3-5-1 Freezer room lamp Def control ASM consists of Defrost Sensor and FUSE-M. 1. Unplug the power cord from the outlet. Defrost Sensor functions to defrost automatically and it is 2. Remove the room lamp lid by loosening 1screw and attached to the Evaporator and the metal side of the case take down while pulling it forward with both hands as senses Temp.

  • Page 21: Adjustment

    4. ADJUSTMENT 4-1 COMPRESSOR 4-2-3 PTC-Applied Circuit Diagram 4-1-1 Role According to Starting Method of Motor The compressor inhales low temperature and low pressure OVERLOAD PROTECTOR gas evaporated from Evaporator of the Refrigerator, and condenses this gas to high temperature and high pressure gas, and then plays delivering role to Condenser.

  • Page 22: Olp (Over Load Protector)

    4-3 OLP (OVER LOAD PROTECTOR) CONTACTING POINT 4-3-1 Definition of OLP COVER (1) OLP (OVER LOAD PROTECTOR) is attached to BIMETAL Hermetic Compressor and protects Motor by cutting off current in Compressor Motor by Bimetal in the OLP in case of over-rising temperature. CONTACTING (2) When over-voltage flows to Compressor motor, Bimetal POINT...

  • Page 23: Circuit Diagram

    5. CIRCUIT DIAGRAM GR-M652Y*A/M712Y*A, M652Y*X/M712Y*X, M652Y*Y/M712Y*Y GR-B652Y*B/B712Y*B, B652Y*S/B712Y*S, B652Y*Y/B712Y*Y GR-B652Y*Q/B712Y*Q GR-B652Y*C/B712Y*C NOTE : 1. This is a basic diagram and specifications vary in different localities. - 23 -...

  • Page 24: Troubleshooting

    6. TROUBLESHOOTING 6-1 COMPRESSOR AND ELECTRIC COMPONENTS (Rating Voltage Remove the PTC-Starter Power Source. 10%)? from the Compressor and measure the voltage between Terminal C of Compressor and Terminals 5 or 6 of PTC. No Voltage. OLP disconnected? Replace OLP. Check connection condition.

  • Page 25: Ptc And Olp

    6-2 PTC AND OLP Check another Observation value at Normal operation of Separate the PTC from electric components. 220V/50Hz : 47 Compressor is Compressor and 220 - 240V/50Hz : 47 impossible or poor. measure the resistance 110 -115V/60Hz : 6.8 between No.

  • Page 26: Another Electric Component

    6-3 ANOTHER ELECTRIC COMPONENTS Cooling is impossible Compressor doesn't Check if current flows to Cause. run. the following components. Poor contacting. a. Thermistor Shorted or broken. b. Starting devices Poor contacting c. OLP or shorted. d. Compressor coil Coil shorted. Replace each Poor contacting e.

  • Page 27: Service Diagnosis Chart

    6-4 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY Cooling is Is the power cord unplugged from the outlet? Plug to the outlet. Check if the power S/W is set to OFF. Set the switch to ON. impossible. Check if the fuse of power S/W is shorted. Replace a regular fuse.

  • Page 28: Refrigerating Cycle

    6-5 REFRIGERATING CYCLE Troubleshooting Chart TEMPERATURE STATE OF THE STATE OF THE CAUSE REMARKS OF THE EVAPORATOR COMPRESSOR PARTIAL Freezer and Low flowing sound of A little higher A little Refrigerant LEAKAGE Refrigerator don’t Refrigerant is heard and than ambient discharges.

  • Page 29: Refrigerating Cycle

    General Control of Refrigerating Cycle ITEMS CONTENTS AND SPECIFICATIONS REMARKS WELDING (1) H 30 Recommend H34 containing 34% Ag in the Chemical Ingredients Service Center. Ag : 30%, Cu : 27%, Zn : 23%, Cd : 20% Brazing Temperature : 710~840°C (2) Bcup-2 Chemical Ingredients Cu : About 93%...

  • Page 30: Description Of Function & Circuit Of Micom

    7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM The following description is basically for GR-M652Y*A/M712Y*A, M652Y*X/M712Y*X, M652Y*Y/M712Y*Y, GRB652Y* B/B712Y*B, B652Y*S/B712Y*S, B652Y*Y/B712Y*Y, GR-B652Y*Q/B712Y*Q For the other models, refer to the diagram of the entire PCB circuit. 7-1 FUNCTION 7-1-1 FUNCTION 1. When the appliance is plugged in, it is set to ‘Medium’. Each time the button is pushed, Exterior display is set to ‘3’...
  • Page 31 7-1-2 SUPER COOL 1. This feature is to shorten the cooling time of the refrigerator by keeping the comp, fan running for a while. When the Super Cool button is pushed, the Super Cool LED turns on in order and the comp keeps on running. In 2 hours, the Super Cool mode will be cleared.
  • Page 32 7-1-5 BUZZER SOUND 1. When the button on the front Display is pushed, “Ding-” sound is produced and it works as follows. 7-1-6 DEFROSTING 1. The defrosting is performed each time when the total running time of the compressor reaches 7 hours. 2.
  • Page 33 3. When the error is cleared while the error code is displayed due to a fault, the appliance returns to the normal condition (Reset). 4. The error code is displayed by the refrigerator temp indication LED on the display of the refrigerator while the remaining LEDs are off. GR-M652Y*A/M712Y*A GR-M652Y*X/M712Y*X GR-M652Y*Y/M712Y*Y GR-B652Y*B/M712Y*B...
  • Page 34 7-1-9 ERROR DIAGNOSTIC MODE 1. The error diagnostic mode allows the SVC when a fault that may affect the performance of the product occurs while operating the product. 2. Even if the function control button is pushed when an error occurs, the function will not be performed. 3.
  • Page 35 7-1-10 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 button is on the main PCB of the refrigerator (Test S/W). The test mode will be cleared in 5 minutes on test mode 1 and in 2 hours on test mode 2 and then reset.
  • Page 36 7-2 PCB FUNCTION 7-2-1 POWER CIRCUIT The power circuit consists of the noise attenuation part and the SMPS (Switch Mode Power Supply) part. The SMPS consists of the rectifier (D1, D2, D3, D4 & CE1) to convert AC voltage to DC voltage, switching part (IC2) to switch the converted DC voltage, transformer to transmit energy of the first side of the switching end to the second side, the secondary power to supply power to MICOM and IC, and the feedback part (IC3) to feedback the secondary voltage to the first side of the transformer in order to maintain the secondary voltage constant.
  • Page 37 7-2-2 OSCILLATION CIRCUIT This circuit is to generate the base clock for calculating time and the synchro clock for transmitting data from and to the inside logic elements of the IC1(MICOM). Be sure to use the authentic parts since the calculating time by the IC1 may be changed or it will not work if the OSC1 SPEC is changed.
  • Page 38 7-2-4 LOAD/BUZZER DRIVE & OPEN DOOR DETECTION CIRCUIT 1. Load Drive Condition Check Defrosting Fan Motor Fan Motor Home Bar Load Type COMP Lamp R-Lamp Heater HIGH RPM Low RPM Heater Measurement Location (IC6) NO.16 NO.12 NO.10 NO.15 NO.14 NO.13 NO.11 1V or below Condition...
  • Page 39 2. Buzzer Drive Condition Check Condition Tone (Beep~) when the button Alarm for open door Measure- on the display is pushed (beep-beep-beep) ment Location IC1 ( IC1 ( 3. Open Door Detection Circuit Check Measurement Location Freezer/ (PIN NO. 34) Refrigerat Door Closed Open...
  • Page 40 7-2-5 TEMPERATURE SENSOR CIRCUIT The following temperature sensor circuit consists of a sensor to detect the outside (ambient) temperature, sensor in refrigerator compartment to detect freezer & refrigerator temp. The status of each sensor, whether open or shorted, is shown below. SENSOR CHECK POINT NORMAL(-30 °C ~ 50 °C)
  • Page 41 7-2-6 SWITCH INPUT CIRCUIT * The circuit shown below is the input circuit to detect the signals of the test S/W for checking the refrigerator. 7-2-7 TEMPERATURE COMPENSATION & OVERCOOLING/UNDERCOOLING COMPENSATION CIRCUIT 1. The circuits for less cooling and overcooling compensation in a refrigerator compartment OVER COOLING LESS COOLING REFRIGERATOR TEMPERATURE...
  • Page 42 7-2-8 KEY BUTTON INPUT & DISPLAY LIGHT ON CIRCUIT The circuit shown above is to determine whether a function control key on the operation display is pushed and to turn on the corresponding function indication LED (LED Module). The drive type is the scan type. - 42 -...
  • Page 43 7-3. RESISTANCE SPECIFICATION OF SENSOR RESISTANCE OF FREEZER RESISTANCE OF REFRIGERATOR TEMPERATURE SENSOR SENSOR (DEFROST) SENSOR - 20°C 22.3 - 15°C 16.9 - 10°C 13.0 47.3 - 5°C 10.1 38.4 0°C + 5°C 24.1 + 10°C 19.5 + 15°C 15.9 + 20°C + 25°C + 30°C...
  • Page 44 - 44 -...
  • Page 45 - 45 -...
  • Page 46 7-5 MAIN PWB ASS'Y AND PARTS LIST 7-5-1 MAIN PWB ASS'Y * In the case of GR-M652/M712 (203V) model. P/No of main ASS’Y is used as EBR327903. - 46 -...
  • Page 47 7-5-2 REPLACEMENT PARTS LIST - 47 -...
  • Page 48 - 48 -...
  • Page 49 7-5-3 PWB ASS'Y, DISPLAY AND PARTS LIST - 49 -...
  • Page 50 7-5-4 PWB ASS'Y, DISPLAY(I-MICOM) AND PARTS LIST - 50 -...
  • Page 51 7-5-5 V-LED DISPLAY & PART LIST - 51 -...
  • Page 52 7-6 PWB DIAGRAM - 52 -...
  • Page 53 - 53 -...

  • Page 54: Exploded View & Replacement Parts List

    9. EXPLODED VIEW & REPLACEMENT PARTS LIST 9-1. The parts of refrigerator and the shape of each part are subject to change in different localities. Capacitors and fuse are optional parts. 501F 281A 103B 301A 410G 411A 281B 501A 401A 103A 501K 129A...
  • Page 55 GR-B652/712Y** GR-M652/712Y** 405C 405A 404A 330B 329A 158E 158D 332A 149A 125A 131A 149C 149C 149E 155J 149B 140A 149D 154A 152A 151A...
  • Page 56 GR-B652/712Y*P 205A 203A 201A 205A 212G 279A 212C 212A 611A 280F 611E 280E 611F 611D 279C 611P 503B 279B 611G 210B 210A 611J 233A 241F 231A 611L 611K 613A 244C 235A 244A 241G 611M 241A 243A 241D 243B...
  • Page 57 P/No. MFL62196001 NOV., 2006 Printed in Korea...

This manual is also suitable for:

Gr-m712y*aGr-m712y*yGr-m652y*qGr-m652y*xGr-m712y*qGr-b652y*b ... Show all

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