LG GN-M492Y*Y Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Refrigerator
  5. GN-M492Y*Y
  6. Service manual

LG GN-M492Y*Y Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
MODEL: GN- M 492Y* Y
GN-M492Y*Q
GN-M492Y*C
GN-B492Y*Q
GN-B492Y*C
http://biz.lgservice.com

Advertisement

Table of Contents
loading

Related Manuals for LG GN-M492Y*Y

Summary of Contents for LG GN-M492Y*Y

  • Page 1 http://biz.lgservice.com REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL. MODEL: GN- M 492Y* Y GN-M492Y*Q GN-M492Y*C GN-B492Y*Q GN-B492Y*C...

  • Page 2: Table Of Contents

    CONTENTS CONTENTS..................................... 2 SERVICING PRECAUTIONS..............................3 SPECIFICATIONS................................... 4 PARTS IDENTIFICATION..............................5-6 DISASSEMBLY..................................7-8 DOOR....................................7 DOOR SWITCH..................................7 FAN AND FAN MOTOR................................ 7 DEF' CONTROL ASM ................................8 LAMP....................................8 CONTROL BOX-R................................8 ADJUSTMENT................................... 9-10 COMPRESSOR..................................9 PTC-STARTER..................................9 OLP (OVER LOAD PROTECTOR)............................. 10 CIRCUIT DIAGRAM ................................

  • Page 3: Servicing Precautions

    SERVICING PRECAUTIONS Air Recharging in Compressor vacuum operation is over, add the quantity in grams of R-134a to the refrigerant system. Remember that every Test the refrigeration by connecting it electrically before system has an exact quantity of R-134a with a tolerance of refilling operation.

  • Page 4: Specifications

    SPECIFICATIONS ITEMS GN-B492Y*Q / B492Y*C GN-M492Y*Y/ M492Y*Q / M492Y*C FREEZER NET CAPACITY REFRIGERATOR ( l ) TOTAL DIMENSIONS (mm) 680(W) 725(D) 1725(H) 680(W) 725(D) 1725(H) NET WEIGHT (kg) FREEZER Knob Dial TEMPERATURE CONTROL REFRIGERATOR Micom Control Full Automatic DEFROSTING SYSTEM...

  • Page 5: Parts Identification

    2. PARTS IDENTIFICATION 2-1. FEATURE CHART u u GN-M492Y*Y, M492Y*Q, M492Y*C Twisting Ice Serve FREEZER (Optional) COMPARTMENT Lamp In-Door Ice Maker(Optional) Shelf Freezer Temperature Freezer Door Rack Control Dial REFRIGERATOR COMPARTMENT Dairy Corner Deodorizer(Optional) Fresh Zone Egg Storage Rack Shelves...
  • Page 6 u u GN-B492Y*Q,B492Y*C FREEZER COMPARTMENT Twisting Ice Serve Lamp Shelf Freezer Door Rack Freezer Temperature Control Dial REFRIGERATOR COMPARTMENT Deodorizer(Optional) Fresh Zone Shelves Lamp Refrigerator Door Rack Vegetable Drawer 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 7: Disassembly

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

  • Page 8: Def Control Asm

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

  • Page 9: Adjustment

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

  • Page 10: 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 Hermetic Compressor and protects Motor by cutting off BIMETAL 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 11: Circuit Diagram

    5. CIRCUIT DIAGRAM u u GN-M492Y*Y, GN-M492Y*Q, GN-B492Y*Q u u GN-M492Y*C, GN-B492Y*C NOTE : 1. This is a basic diagram and specifications vary in different localities. - 11 -...

  • Page 12: 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 13: Ptc And Olp

    6-2 PTC AND OLP Check another Normal operation of Separate the PTC from Observation value at electric components. Compressor is 220V/50Hz : 47Ω ± 30% Compressor and impossible or poor. 220 - 240V/50Hz : 47Ω ± 30% measure the resistance 110 -115V/60Hz : 6.8Ω...

  • Page 14: Another Electric Component

    6-3 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 15: 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. impossible. • Check if the power S/W is set to OFF. • Set the switch to ON. •...

  • Page 16: Refrigerating Cycle

    6-5 REFRIGERATING CYCLE Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE CAUSE REMARKS OF THE THE SET EVAPORATOR COMPRESSOR PARTIAL Freezer and Low flowing sound of A little higher • A little Refrigerant LEAKAGE Refrigerator Refrigerant is heard and than •...
  • Page 17 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 18: Description Of Function & Circuit Of Micom

    7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM The following description is basically for GN-M492Y*Y/ GN-M492Y*Q/ GN-M492Y*C/ GN-B492Y*Q / GN-B492Y*C 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 19 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 20 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 21 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. u GN-M492Y*Y GN-M492Y*Q GN-B492Y*Q State of Operation with Error...
  • Page 22 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 23 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 24 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 25 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 26 7-2-4 LOAD/BUZZER DRIVE & OPEN DOOR DETECTION CIRCUIT 1. Load Drive Condition Check COMP Defrosting Heater Lamp Load Type Fan Motor Low RPM R-Lamp Measurement Location (IC6) NO.16 NO.12 NO.12 NO.14 NO.11 1V or below Condition * When the door of the freezer/refrigerator is left open for 7 minutes or longer, the lamp of the freezer/refrigerator turns off automatically.
  • Page 27 2. Buzzer Drive Condition Check Condition Tone (Beep~) when the button on the display is pushed Alarm for open door (beep-beep-beep) Measure- ment Location 0.1 s 0.5 s 0.5 s 0.5 s IC1 ( 1.9 kH (Beep~) IC1 ( 1.9 kH (Beep~) 3.
  • Page 28 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. The upper CIRCUIT reads FREEZER and REFRIGERATOR temperature, and DEF-SENSOR temperature for defrosting and the indoor temperature for compensating for the surrounding temperature, into MICOM.
  • Page 29 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 30 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. - 30 -...
  • Page 31 7-3. RESISTANCE SPECIFICATION OF SENSOR TEMPERATURE SENSOR RESISTANCE OF FREEZER RESISTANCE OF REFRIGERATOR SENSOR (DEFROST) 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 32 - 32 -...
  • Page 33 - 33 -...
  • Page 34 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. - 34 -...
  • Page 35 7-5-2 REPLACEMENT PARTS LIST - 35 -...
  • Page 36 - 36 -...
  • Page 37 7-5-3 PWB ASS'Y, DISPLAY AND PARTS LIST - 37 -...
  • Page 38 7-5-4 PWB ASS'Y, DISPLAY(I-MICOM) AND PARTS LIST - 38 -...
  • Page 39 7-5-5 V-LED DISPLAY & PART LIST - 39 -...
  • Page 40 7-6 PWB DIAGRAM - 40 -...
  • Page 41 - 41 -...

  • Page 42: Exploded View & Replacement Parts List

    8. EXPLODED VIEW & REPLACEMENT PARTS LIST 8-1. 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 410G 301A 411A 281B 501A 401A 103A 501K 129A...
  • Page 43 GN-M492Y*Y GN-M492Y*Q GN-M492Y*C 405C 405A GN-B492Y*Q GN-B492Y*C 404A 330B 329A 158E 158D 332A 149A 149A 149A 125A 131A 140A 149B 149C 149C 152A 154A 152C 152D 152B 155B 151A - 43 -...
  • Page 44 GN-M492Y*Y GN-M492Y*Q 200A 205A 205A 203A 201A 205A 212G 205A 279A 212A 212C 280F 280E 279C 249B 503B 279B 235A 233B 210B 241C 210A 230A 233A 231A 241D 244A 244C 241A 241D 210B 210A - 44 -...
  • Page 45 u GN-B492Y*Q 200A 205A 203A 201A 205A 212G 279A 212A 212C 280F 280E 279C 503B 279B 235A 210B 210A 241A 230A 233A 231A 241D 244A 244C 241A 241D 210B 210A - 45 -...
  • Page 46 u GN-M492Y*C 200A 205A 203A 201A 205A 212G 212A 212C 249B 235A 233B 210B 241C 210A 230A 233A 231A 241D 244A 244C 241A 241D 210B 210A - 46 -...
  • Page 47 u GN-B492Y*C 200A 205A 203A 201A 205A 212G 212A 212C 210B 235A 210A 230A 233A 231A 241A 241D 244A 244C 241A 241D 210B 210A - 47 -...
  • Page 48 GN-M492Y*Y 265J 267K 267D 267A 267C 267J 265K 267B 267H 267G 267F 265L 267E 255A 264M - 48 -...

This manual is also suitable for:

Gn-m492y*qGn-m492y*cGn-b492y*qGn-b492y*c

Table of Contents