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LG GR-B652Y*B, Service Manual

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LG GR-B652Y*B Service Manual Download Page 36

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7-2 PCB FUNCTION

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.

Caution

: High voltage (DC 310V) is maintained in this circuit. Wait at least 3 minutes after unplugging to allow the current

to dissipate. There is a danger of electric shock.

7-2-1 POWER CIRCUIT

Summary of Contents for GR-B652Y*B

Page 1: ... 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 REFRIGERATOR SERVICE MANUAL ...

Page 2: ...any materials on the set especially thin plate type ex glass shelf or books 9 When servicing evaporator part wear cotton gloves without fail It is to prevent wound by sharp fin of vaporator 10 Leave a breakage of refrigerating cycle to a heavy service center The gas in cycle inside may soil ambient air CONTENTS 2 SERVICING PRECAUTIONS 3 SPECIFICATIONS 4 5 PARTS IDENTIFICATION 6 15 FEATURE CHART 6 ...

Page 3: ...ase of the cylinder and connected to the filling tube The amount of Freon cannot be added to the system all at once because it may cause a blocking of motor compressor Therefore proceed by adding original quantity of about 20 30 grams and close the valve immediately The pressure rises and the motor compressor must start sucking the gas and making the pressure go down again Regulate the valve again...

Page 4: ...ING SYSTEM VEGETABLE TRAY EGG TRAY ICE TRAY ICE BANK COMPRESSOR EVAPORATOR CONDENSER REFRIGERANT DEFROSTING DEVICE OUT CASE INNER CASE INSULATION Knob Dial Micom Control Full Automatic Heater Defrost Pre Coated Metal A B S Cyclo Pentane Foam 1 EA 2 EA 3EA Option Drawer Type 1 Piece 2 Piece 1 Piece P T C Starting Type Fin Tube Type Wire Condenser Screw Condenser R134a 140g R600a 69g Heater GR M712Y...

Page 5: ...EM VEGETABLE TRAY EGG TRAY ICE TRAY ICE BANK COMPRESSOR EVAPORATOR CONDENSER REFRIGERANT DEFROSTING DEVICE OUT CASE INNER CASE INSULATION Knob Dial Micom Control Full Automatic Heater Defrost Pre Coated Metal A B S Cyclo Pentane Foam 1 EA 2 EA 3EA Option Drawer Type 1 Piece 2 Pieces 1 Piece P T C Starting Type Fin Tube Type Wire Condenser Screw Condenser R134a 140g R600a 69g Heater GR M652Y A M652...

Page 6: ...r Refrigerator Door Rack Lamp Shelf Deodorizer Optional Shelves Optional Lamp Convertible Room Freezer Temperature Control Dial REFRIGERATOR COMPARTMENT Vegetable Drawer Vita Light NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the features shown above GR M652Y A M712Y A GR M652Y X M712Y X 2 1 FEATURE CHART ...

Page 7: ...r Door Rack Lamp Shelf Deodorizer Optional Shelves Optional Lamp Convertible Room Freezer Temperature Control Dial REFRIGERATOR COMPARTMENT Vegetable Drawer Vitamin Kit optional NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the features shown above GR M652Y Y M712Y Y ...

Page 8: ...p Shelf Deodorizer Optional Shelves Optional Lamp Convertible Room Freezer Temperature Control Dial REFRIGERATOR COMPARTMENT Vegetable Drawer Vitamin Kit optional NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the features shown above GR B652Y Y B712Y Y ...

Page 9: ...r Door Rack Lamp Shelf Deodorizer Optional Shelves Optional Lamp Convertible Room Freezer Temperature Control Dial REFRIGERATOR COMPARTMENT Vegetable Drawer Vitamin Kit optional NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the features shown above GR M652Y Q M712Y Q ...

Page 10: ...mp Shelf Deodorizer Optional Shelves Optional Lamp Convertible Room Freezer Temperature Control Dial REFRIGERATOR COMPARTMENT Vegetable Drawer Vitamin Kit optional NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the features shown above GR B652Y Q B712Y Q ...

Page 11: ...or Rack Lamp Shelf Deodorizer Optional Shelves Optional Lamp Convertible Room Freezer Temperature Control Dial REFRIGERATOR COMPARTMENT Vegetable Drawer Vita Light NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the features shown above GR B652Y B B712Y B ...

Page 12: ...ck Lamp Shelf Deodorizer Optional Shelves Optional Lamp Convertible Room Freezer Temperature Control Dial REFRIGERATOR COMPARTMENT Vegetable Drawer Vitamin Kit optional NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the features shown above GR B652Y S B712Y S ...

Page 13: ...ck Lamp Shelf Deodorizer Optional Shelves Optional Lamp Convertible Room Freezer Temperature Control Dial REFRIGERATOR COMPARTMENT Vegetable Drawer Vitamin Kit optional GR B652Y P B712Y P NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the features shown above ...

Page 14: ...rigerator Door Rack Lamp Twigting Ice Serve Deodorizer Optional Shelves Optional Lamp Convertible Room Shelf REFRIGERATOR COMPARTMENT Vegetable Drawer Vitamin Kit optional NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the features shown above GR B652Y C B712Y C ...

Page 15: ...tor Door Rack Lamp Twigting Ice Serve Deodorizer Optional Shelves Optional Lamp Convertible Room Shelf REFRIGERATOR COMPARTMENT Vegetable Drawer Vitamin Kit optional NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the features shown above GR M652Y C M712Y C Dairy Corner ...

Page 16: ...uding soft drinks milk and juices 2 Hot water needs to be cooled before being put in the water tank Putting The Water In The Water Tank 1 Press the dispenser pad with the glass 2 The water is released when the dispenser pad is pressed The pad returns to its original position when the glass is removed and the water stops its flow Drinking CAUTION DISPENSER PAD GRILLE WATER TANK REFRIG ERATOR DOOR R...

Page 17: ...the water tank with dishwashing detergent and rinse thoroughly under running water 3 Clean the tank cover with dishwashing detergent and rinse thoronghly under running water Water Tank 1 Use lukewarm water when cleaning 2 Do not use anything other than water If it is used with soft drinks put water in the water tank and discharge three or four cups of water shortly CAUTION ...

Page 18: ...sembly is made in reverse order 2 4 HOW TO DISASSEMBLE AND ASSEMBLE HANDLE 2 Assemble the new handle deco and handle base 1 Assemble new handle base by tightening 3 screws 1 Disassemble the handle deco and handle base 1 Remove handle deco by pulling it out with tooling Freezer handle 1 2 3 Refrigerator handle 2 Remove handle base by loosening 3 screws Upper 1 screw Lower 2 screws Upper 1 screw Low...

Page 19: ...crew 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 separate the Fan Motor Brackets and the Guide Fan Refrigerator Door 1 Loosen hexagonal bolts fixing the lower hinge to the body to remove the refrigerator door only 2 Pull out the door gasket to remove from the door foam Ass y 3...

Page 20: ...rol ASM after cutting the Tie Wrap Figure 14 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 forwa...

Page 21: ... For normal operation of single phase induction motor in the starting operation flows in both main coil and subcoil 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 2 Role of PTC Starter 4 2 3 PTC Applied Circuit Diagram According to Starting Method of Motor 1 For restarting after power...

Page 22: ...er inside OLP and OLP protects Motor by cutting off current which flows to Compressor Motor 4 3 1 Definition 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 4 3 2 Role of OLP CONTACTING...

Page 23: ...AM 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 ...

Page 24: ...Replace PTC Starter Replace OLP O K OLP disconnected YES YES YES NO NO NO NO NO YES YES YES YES 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 ...

Page 25: ... 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 47 30 220 240V 50Hz 47 30 110 115V 60Hz 6 8 30 220V 60Hz 47 30 127V 60Hz 22 30 The resistance value is 0 or several hundreds or infinity Check another electric components Replace OLP Check another electric components Replace PTC NO YES Fi...

Page 26: ...d Shorted Check a starting voltage Check if current flows to starting devices Check capacity of OLP Check current flowing in sub coil of Compressor The items described above are normal Check current flowing in door S W Check current flowing in the Fan Motor Check current flowing of the following components Def Sensor FUSE M Check current flowing of the following components Heater plate Heater cord...

Page 27: ...It smells plastic Plug to the outlet Set the switch to ON Replace a regular fuse If voltage is low wire newly Place the set with the space of about 10cm Place the set apart from these heat appliances Make the ambient temperature below Put in foods after they get cold Don t open the door too often and close it firmly Set the control to mid position Place foods in high temperature section Front Part...

Page 28: ...t forms in inlet only Flowing sound of Refrigerant is not heard and frost isn t formed Flowing sound of Refrigerant is heard and frost forms in inlet only Flowing sound of Refrigerant is not heard and frost melts Flowing sound of Refrigerant is not heard and no frost Flowing sound of Refrigerant is not heard and frost isn t formed Low flowing sound of Refrigerant is heard and frost forms in inlet ...

Page 29: ...m degree must be same to the value described item 2 above for more than 20 min 1 The pressure of dry air must be more than 12 16Kg cm2 2 Temperature must be more than 20 70 C 3 Keep the pressure to 12 6Kg cm2 also when substituting dry air for Nitrogen Gas 1 Check if gas leaks with soapy water 2 Replace Quick Coupler in case of leakage Put all Joint Pipe in a clean box and cover tightly with the l...

Page 30: ...r display is set to 3 2 1 0 6 5 4 in order 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 1 1 FUNCTION GR M652Y A M712Y A GR M652Y X M712Y X GR M652Y Y M712Y Y GR B652Y B M712Y B GR B652Y S B712Y S GR B652Y Y B712Y Y GR B652Y Q B712Y Q GR B652Y C B712Y C ...

Page 31: ...ER COOL 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 door of freezer room or refrigerator room is opened the FAN M...

Page 32: ...rformed 7 1 6 DEFROSTING 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 7 1 7 SEQUENTIAL OPERATION OF ELECTRIC COMPONENTS Condition of Operation POWER ON COMP ON COOLING FAN ON POWER ON ...

Page 33: ... GR B652Y B M712Y B GR B652Y S B712Y S GR B652Y Y B712Y Y GR B652Y Q B712Y Q Error Error Code Display Comp NO Cooling fan Defrosting heater Cause State of Operation with Error 1 2 3 4 r d when super cool and refrigerator key pressed together display will be all off H Faulty refrigerator R sensor Cut or short circuited wire of refrigerator sensor 15 min ON 15 min OFF Normal Condition Low RPM Normal...

Page 34: ...RROR DIAGNOSTIC MODE GR B652Y C B712Y C Error Error Code Display State of Operation with Error R0 R1 R2 R3 R4 Comp Cooling fan Defrosting heater NO Cause Faulty refrigerator sensor on the control box of the refrigerator Faulty defrosting sensor Faulty room temp sensor in the main PCB Defrosting failure Cut or short circuited wire of refrigerator sensor Cut or short circuited wire of defrosting sen...

Page 35: ...r OFF 4 Every display LED ON 5 F lamp can be switch on off by door open close Push the test button once Push the test button once while in the TEST MODE 1 Reset if the temp of the defrosting sensor is 13 C or above The compressor will start in 7 minute delay Push the test button once while in the TEST MODE 2 1 Comp OFF 2 Freezer fan OFF 3 Defrosting heater ON 4 Every display LED OFF except the ref...

Page 36: ...mer 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 to allow the curre...

Page 37: ...ot work if the OSC1 SPEC is changed 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...

Page 38: ...rigerator turns off automatically 7 2 4 LOAD BUZZER DRIVE OPEN DOOR DETECTION CIRCUIT 1 Load Drive Condition Check Load Type COMP Defrosting Heater Fan Motor HIGH RPM Fan Motor Low RPM Home Bar Heater Lamp R Lamp Measurement Location IC6 NO 16 NO 12 Condition ON 1V or below OFF 12V NO 10 NO 15 NO 14 NO 13 NO 11 ...

Page 39: ...en Door Detection Circuit Check Condition Tone Beep when the button on the display is pushed Alarm for open door beep beep beep OFF 0V 0V Measure ment Location IC1 IC1 PIN NO 34 Measurement Location Freezer Refrigerat Door Closed 0V Open 5V ...

Page 40: ...ator compartment to detect freezer refrigerator temp The status of each sensor whether open or shorted is shown below 7 2 5 TEMPERATURE SENSOR CIRCUIT Room Temperature Sensor Refrigeration Sensor Defrosting Sensor SENSOR POINT Voltage POINT Voltage POINT Voltage CHECK POINT 0 5V 4 5V NORMAL 30 C 50 C 0V SHORT CIRCUITED 5V OPEN ...

Page 41: ...compartment The above OPTION circuit is to compensate refrigerator temperature by simply cutting during service 7 2 7 TEMPERATURE COMPENSATION OVERCOOLING UNDERCOOLING COMPENSATION CIRCUIT OVER COOLING COMPENSATION LESS COOLING COMPENSATION REFRIGERATOR TEMPERATURE COMPENSATION VALUES REMARKS JCR1 CUT CUT CUT CUT JCR2 CUT CUT CUT CUT JCR3 CUT CUT CUT CUT CUT JCR4 CUT CUT CUT 1 C 2 C 1 C 2 C 0 C 0 ...

Page 42: ...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 7 2 8 KEY BUTTON INPUT DISPLAY LIGHT ON CIRCUIT ...

Page 43: ... minutes in measuring temperature This postponing is necessary because of perceiving speed TEMPERATURE SENSOR RESISTANCE OF FREEZER SENSOR RESISTANCE OF REFRIGERATOR DEFROST SENSOR 20 C 15 C 10 C 5 C 0 C 5 C 10 C 15 C 20 C 25 C 30 C 40 C 50 C 22 3 16 9 13 0 10 1 7 8 6 2 4 9 3 9 3 1 2 5 2 0 1 4 0 8 77 60 47 3 38 4 30 24 1 19 5 15 9 13 11 8 9 6 2 4 3 ...

Page 44: ...oor COMPRESSOR RELAY is poor THE CONNECTING WIRE is poor Certify Fuse Certify outlet Voltage Use boosting TRANS Reconnect CONNECTOR Replace TRANS Replace COMPRESSOR Replace OLP PTC Replace MAIN PWB RY1 Certify the black wire of MAIN PWB CONNECTOR CON2 FREEZER TEMPERATURE is poor 1 Whether FAN MOTOR operates or not PRESS TEST KEY on MAIN PWB once forced COOLING FAN MOTOR is poor DOOR LINEAR contact...

Page 45: ...TING is poor NO DEFROSTING 1 HEATER emit heat PRESS TEST KEY on MAIN PWB three times forced DEFROSTING HEATER disconnection TEMPERATURE FUSE disconnection Connection is poor DEF SENSOR is poor HEATER RELAY is poor Replace HEATER Replace TEMPERATURE FUSE Certify EVA connection and wire of MAIN PWB CONNECTOR Replace DEF SENSOR Replace RY5 of MAIN PWB 2 DRAIN PIPE blocking Certify DRAIN PIPE DRAIN PI...

Page 46: ... 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 ...

Page 47: ... 47 7 5 2 REPLACEMENT PARTS LIST ...

Page 48: ... 48 ...

Page 49: ... 49 7 5 3 PWB ASS Y DISPLAY AND PARTS LIST ...

Page 50: ... 50 7 5 4 PWB ASS Y DISPLAY I MICOM AND PARTS LIST ...

Page 51: ... 51 7 5 5 V LED DISPLAY PART LIST ...

Page 52: ... 52 7 6 PWB DIAGRAM ...

Page 53: ... 53 ...

Page 54: ...315B 315C 103C 120A 409B 158C 158A 408A 409A 401A 301A 129A 281B 281A 501F 103B 411A 501A 103A 501K 307A 314A 312A 329C 319A 310A 323B 406B 410G 420A 310B 303A 303B 303C 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 ...

Page 55: ...GR B652 712Y GR M652 712Y 405C 405A 404A 329A 158D 332A 330B 158E 149A 131A 149C 149C 149E 149B 149D 154A 151A 140A 155J 125A 152A ...

Page 56: ...GR B652 712Y P 205A 205A 235A 241G 241A 241D 611A 611D 611E 611F 611G 611J 241F 611K 243B 243A 244A 244C 231A 233A 210A 210B 279B 503B 279C 280E 280F 279A 212G 212A 212C 201A 203A 611L 611M 611P 613A ...

Page 57: ...P No MFL62196001 NOV 2006 Printed in Korea ...

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