LG GN-B492Y*C Service Manual Download | Manualshive

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NOTE : 1. This is a basic diagram and specifications vary in different localities.

5. CIRCUIT DIAGRAM

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Summary of Contents for GN-B492Y*C

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL GN M492Y Y GN M492Y Q GN M492Y C GN B492Y Q GN B492Y C REFRIGERATOR SERVICE MANUAL http biz lgservice com ...

Page 2: ...ectric shock unplug prior to servicing 3 In case of testing with power on wear rubber gloves to prevent electric shock 4 If you use any appliances check regular current voltage and capacity 5 Don t touch metal products in cold freezer with wet hand It may cause frostbite 6 Prevent water flowing to electric elements in mechanical parts 7 When you stand up during observing the lower part with the up...

Page 3: ...ration is over add the quantity in grams of R 134a to the refrigerant system Remember that every system has an exact quantity of R 134a with a tolerance of 5 grams that can be added Figure 4 Before performing this operation if the vacuum pump and refilling cylinder are connected make sure that the valve placed between the vacuum pump and refilling tube are closed to keep the Freon for adding to th...

Page 4: ...DEFROSTING SYSTEM Full Automatic Heater Defrost OUT CASE Pre Coated Metal INNER CASE A B S INSULATION Cyclo Pentane Foam FREEZER 1 EA REFRIGERATOR 2 EA 3EA Option VEGETABLE TRAY Drawer Type EGG TRAY 1 Piece ICE TRAY 2 Pieces ICE BANK 1 Piece COMPRESSOR P T C Starting Type EVAPORATOR Fin Tube Type CONDENSER Wire Condenser Screw Condenser REFRIGERANT R134a 135 DEFROSTING DEVICE Heater TEMPERATURE CO...

Page 5: ...own above FREEZER COMPARTMENT REFRIGERATOR COMPARTMENT Lamp In Door Ice Maker Optional Twisting Ice Serve Optional or Freezer Door Rack Egg Storage Rack Green Ion Door Cooling Optional Dairy Corner Levelling Screw Refrigerator Door Rack Base Cover Lamp Shelves Fresh Zone Vegetable Drawer Vitamin Kit Optional Shelf Freezer Temperature Control Dial Deodorizer Optional Vegetable Partitioner Optional ...

Page 6: ...ve purchased may have some or all of the features shown above FREEZER COMPARTMENT REFRIGERATOR COMPARTMENT Lamp Freezer Temperature Control Dial Freezer Door Rack Levelling Screw Refrigerator Door Rack Base Cover Lamp Shelves Fresh Zone Vegetable Drawer Shelf Twisting Ice Serve Deodorizer Optional ...

Page 7: ...R SWITCH 1 To remove the door switch pull out it with a type driver as shown in figure 9 2 Disconnect the lead wire from the switch 3 3 FAN AND FAN MOTOR 1 Remove the freezer shelf 2 Remove the Cover Lamp F by loosening 1 screw fixed to ceiling of Inner Liner 3 Remove the Grille by pulling it out 4 Pull out the Shroud and remove the Fan Motor Assy by loosening 2 screws 5 Pull out the fan and separ...

Page 8: ...3 5 1 Freezer room lamp 1 Unplug the power cord from the outlet 2 Remove the room lamp lid by loosening 1screw and take down while pulling it forward with both hands as shown in figure 3 Remove the lamp by turning it counterclockwise 3 5 2 Refrigerator room lamp 1 Unplug the power cord from the outlet 2 Remove refrigerator shelves 3 Remove the room lamp lid by pulling it forward 4 Make sure the bu...

Page 9: ... For normal operation of single phase induction motor in the starting operation flows in both main coil and sub coil After the starting is over the current is cut off in subcoil The proper features of PTC play the above all roles So PTC is used as a starting device of motor 4 2 3 PTC Applied Circuit Diagram According to Starting Method of Motor 4 2 4 Motor Restarting and PTC Cooling 1 For restarti...

Page 10: ...s by heating the heater inside OLP and OLP protects Motor by cutting off current which flows to Compressor Motor 4 3 2 Role of OLP 1 OLP is attached to Hermetic Compressor used to Refrigerator and Show Case and prevents Motor Coil from being started in the Compressor 2 Do not turn the Adjust Screw of OLP in any way for normal operation of OLP Composition and connection Diagram of OLP 10 CONTACTING...

Page 11: ...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 5 CIRCUIT DIAGRAM 11 ...

Page 12: ...ted Advise the customer to use a regular Trans Replace Compressor OLP works within 30 sec in forcible OLP operation by turning instant power on and off Components start at voltage 10 of rated voltage Applied voltage isn t in the range of Rating Voltage 10 Check the resistance among M C S C and M S in Motor Compressor Check the resistance of two terminals in PTC Starter Check if applying a regular ...

Page 13: ...at stone bridge Figure 22 Separate the OLP from Compressor and check resistance value between two terminals of OLP with a Tester Figure 23 Observation value at 220V 50Hz 47Ω 30 220 240V 50Hz 47Ω 30 110 115V 60Hz 6 8Ω 30 220V 60Hz 47Ω 30 127V 60Hz 22Ω 30 The resistance value is 0 or several hundreds Ω or infinity Check another electric components Replace OLP Check another electric components Replac...

Page 14: ... Replace the compressor Replace each component Raise the voltage Replace each component Cause Check if current flows to starting devices Check current flowing in sub coil of Compressor Check capacity of OLP The items described above are normal Cooling ability is poor Fan motor doesn t run Much frost are sticked to the EVAPORATOR Poor contacting Coil is shorted Shorted Replace each component Replac...

Page 15: ...en or check if the door is closed up it firmly Dew forms Check if ambient temperature and humidity Wipe dew with a dry cloth This happening in the Out Case of surrounding air are high is solved in low temperature and humidity naturally Is the gap in the door packed Fill up the gap Abnormal Is the set positioned in a firm and even place Adjust the Leveling screw and position noise generates in the ...

Page 16: ... Normal cooling is possible don t get cold formed when injecting Refrigerant at all of regular amount PARTIAL Freezer room and Flowing sound of Refrigerant A little higher Normal discharging of CLOG Refrigerator is heard and frost forms than refrigerant don t get cold in inlet only ambient The capillary tube is faulty normally temperature WHOLE Freezer and Flowing sound of Refrigerant Equal to amb...

Page 17: ...ge without fail 1 gauge of charging M C vacuum Perform vacuum operation until a proper 1 degree is within 1 Torr vacuum degree is built up 2 If the vacuum degree of the cycle inside is If a proper vacuum degree isn t built up 2 10 Torr below for low pressure and 20 Torr check the leakage from 2 for high pressure it says no vacuum the Cycle Pipe line part and 2 leakage state Quick Coupler Connectin...

Page 18: ...rder and Interior display is set to R2 R3 R4 R0 R1 2 When the power is initially applied or restored after a power failure it is automatically set to 3 against the interruption of electric power 7 DESCRIPTION OF FUNCTION CIRCUIT OF MICOM 18 u GN M492Y Y GN M492Y Q GN B492Y Q MIN MAX REF TEMP CONTROL R0 R1 R2 R3 R4 Temp Medium Medium Control Low Low Medium High High TEMP C ROOM REFRIGERATOR Temp Ve...

Page 19: ... RPM 7 1 3 CONTROL OF VARIABLE SPEED FAN IN THE FREEZER COMPARTMENT 1 Fan motor in the freezer compartment shall change from standard to high speed rpm in order to increase cooling speed and load corresponding speed 2 Hign speed rpm is only used for the initial power application super cool mode and load corresponding operation But standard rpm is used in the general working conditions 3 When the d...

Page 20: ...circuited wire the defrosting will not be performed 7 1 7 SEQUENTIAL OPERATION OF ELECTRIC COMPONENTS The electric components such as the comp defrosting heater and cooling fan start sequentially to avoid the noise and damage to the part which may result from the simultaneous start of various components on turning the power on or after the completion of a test Condition of Operation Operating Sequ...

Page 21: ...GN M492Y Y GN M492Y Q GN B492Y Q NO Error Error Code Cause State of Operation with Error Display Comp Cooling fan Defrostingheater 1 2 3 4 Faulty refrigerator R sensor Faulty defrosting sensor Faulty Room temperature sensor in the main PCB Defrosting failure r d whensupercooland refrigeratorkeypressed togetherdisplaywillbealloff H Cut or short circuited wire of refrigerator sensor Cut or short cir...

Page 22: ... are off 22 MIN MAX REF TEMP CONTROL NO Error Error Code Display Cause R0 R1 R2 R3 R4 Comp Coolingfan Defrosting heater OFF ON 1 2 3 4 Faultyrefrigerator sensor onthecontrol boxoftherefrigerator Faultydefrosting sensor Faultyroomtemp sensorinthemain PCB Defrosting failure Cut or short circuited wire of refrigerator sensor Cut or short circuited wire of defrosting sensor Cut or short circuited wire...

Page 23: ...tton 1 Continuous operation of the comp once 2 Continuous operation of the freezer fan 3 Defrosting heater OFF 4 Every display LED ON 5 F lamp can be switch on off by door open close TEST 2 Push the test button 1 Comp OFF Reset if the temp of once while in the 2 Freezer fan OFF the defrosting sensor TEST MODE 1 3 Defrosting heater ON is 13 C or above 4 Every display LED OFF except the refrigerator...

Page 24: ... 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 Caution High voltage DC 310V is maintained in this circuit Wait at least 3 minutes after unplugging t...

Page 25: ... is changed 7 2 3 RESET CIRCUIT The RESET circuit is for allowing all the functions to start at the initial conditions by initializing various parts including the RAM inside the MICOM IC1 when the power is initially supplied or the power supply to the MICOM is restored after a momentary power failure For the initial 10ms of power supply LOW voltage is applied to the MICOM RESET terminal During a n...

Page 26: ...the door of the freezer refrigerator is left open for 7 minutes or longer the lamp of the freezer refrigerator turns off automatically 26 Load Type COMP NO 16 NO 12 NO 12 NO 14 NO 11 1V or below 12V Defrosting Heater Lamp R Lamp Fan Motor Low RPM Measurement Location IC6 Condition ON OFF ...

Page 27: ...the button on the display is pushed Alarm for open door beep beep beep OFF IC1 0 V IC1 0 V Measure ment Location Condition 0 V 5 V 0 V 5 V 0 5 s 0 5 s 1 9kHz Beep OFF 0 1 s 0 5 s 0 V 5 V 0 V 5 V 1 9 kHz Beep PIN NO 34 Closed 0 V Open 5 V Freezer Refrigerat Door Measurement Location A B ...

Page 28: ...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 OPENING or SHORT state of each TEMPERATURE SENSOR are as follows 28 SENSOR CHECK POINT NORMAL 30 C 50 C SHORT CIRCUITED OPEN Room Temperature Sensor POINT Voltage Refrigeration Sensor POINT Volta...

Page 29: ... circuits for less cooling and overcooling compensation in a refrigerator compartment The above OPTION circuit is to compensate refrigerator temperature by simply cutting during service 29 OVER COOLING LESS COOLING COMPENSATION COMPENSATION REFRIGERATOR TEMPERATURE REMARKS JCR1 JCR2 JCR3 JCR4 COMPENSATION VALUES CUT 1 C CUT CUT 2 C CUT 1 C CUT CUT 2 C CUT CUT 0 C CUT CUT 0 C CUT CUT CUT 1 C CUT CU...

Page 30: ...LAY 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: ...speed Measure the F SENSOR SUPER FROST SENSOR R1 R2 SENSOR after disconnect CON5 of PWB ASSY MAIN 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 38 4 KΩ 0 C 7 8 KΩ 30 KΩ 5 C 6 2 KΩ 24 1 KΩ 10 C 4 9 KΩ 19 5 KΩ 15 C 3 9 KΩ 15 9 KΩ 20 C 3 1 KΩ 13 KΩ 25 C 2 5 KΩ 11 KΩ 30 C 2 0 KΩ 8 9 KΩ 40...

Page 32: ...d COOLING blocked If pass less than 7 minutes OLP PTC is poor Replace OLP PTC after stop of COMP don t COMPRESSOR RELAY is Replace MAIN PWB RY1 press it and stand by poor THE CONNECTING WIRE Certify the black wire of MAIN is poor PWB CONNECTOR CON2 2 Whether refrigerant leaks or Measure the amount of frost Refrigerant leakage Remedy the leaking part not sticking on EVA and the and reaching Refrige...

Page 33: ...NG is NO DEFROSTING 1 HEATER emit heat PRESS TEST KEY on MAIN HEATER disconnection Replace HEATER poor PWB three times forced DEFROSTING TEMPERATURE FUSE Replace TEMPERATURE disconnection FUSE Connection is poor Certify EVA connection and wire of MAIN PWB CONNECTOR DEF SENSOR is poor Replace DEF SENSOR HEATER RELAY is poor Replace RY5 of MAIN PWB 2 DRAIN PIPE blocking Certify DRAIN PIPE DRAIN PIPE...

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: ... 38 7 5 4 PWB ASS Y DISPLAY I MICOM AND PARTS LIST ...

Page 39: ... 39 7 5 5 V LED DISPLAY PART LIST ...

Page 40: ...7 6 PWB DIAGRAM 40 ...

Page 41: ... 41 ...

Page 42: ...d fuse are optional parts 8 EXPLODED VIEW REPLACEMENT PARTS LIST 42 106B 283B 304A 406B 106A 315A 282B 103C 281B 501F 323B 328A 329C 420A 319A 315B 315B 315C 318A 314A 307A 312A 317A 310A 120A 327A 129A 158A 409B 281A 604F 319C 604E 501A 501K 411A 328B 309A 308A 282J 103B 103A 105A 301A 418A 407A 409B 410G 401A 158C ...

Page 43: ... 43 149A 149C 149B 149C 330B 405C 404A 158E 405A 158D 329A 332A 152A 154A 140A 149A 155B 152C 152D 152B 151A 125A 149A 131A u GN M492Y Y GN M492Y Q GN M492Y C GN B492Y Q GN B492Y C ...

Page 44: ... 44 203A 200A 233A 230A 241C 235A 249B 241D 241A 241D 205A 205A 233B 231A 201A 244C 244A 212G 212C 212A 210A 210B 205A 205A 503B 279B 279C 280E 280F 279A 210A 210B u GN M492Y Y GN M492Y Q ...

Page 45: ... 45 203A 200A 233A 230A 205A 205A 231A 201A 244C 244A 212G 212C 212A 210A 210B 503B 279B 279C 280E 280F 279A 210A 210B 241D 241A 241D 235A 241A u GN B492Y Q ...

Page 46: ... 46 233A 230A 241C 235A 249B 241D 241A 241D 205A 205A 233B 231A 244C 244A 210A 210B 203A 200A 201A 212G 212C 212A 210A 210B u GN M492Y C ...

Page 47: ... 47 203A 200A 233A 230A 241D 241A 241D 235A 205A 205A 231A 201A 244C 244A 212G 212C 212A 210A 210B 241A 210B 210A u GN B492Y C ...

Page 48: ... 48 265K 267C 267J 267K 267D 267B 267H 267F 267G 267E 265J 267A 255A 265L 264M u GN M492Y Y ...

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