LG LRSC21934SW Service Manual Download Page 44

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1-9. Fan motor driving circuit (freezing room, M/C room)

1. This circuit performs function to make standby power ‘0’ by cutting off power supplied to ICs inside of the fan motor in the

fan motor OFF.

2. This is a circuit to perform a temporary change of speed for the fan motor and applies DC voltage up to 7.5V ~ 16V to

motor.

3. This circuit performs function not to drive the fan motor further by cutting off power applied to the fan motor in the lock of

fan motor by sensing the operation RPM of the fan motor.

1) GR-P247, L247, P207, L207

EXPLATION FOR MICOM CIRCUIT

- 44 -

b , d part

a part

c part

Motor OFF

2V or less

Motor ON

2 ~ 3V

12 ~ 14V

8 ~ 16V

Summary of Contents for LRSC21934SW

Page 1: ... PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK BEFORE CHECKING OR OPERATING THE REFRIGERATOR REFRIGERATOR SERVICE MANUAL MODEL GR L247WVS COLOR SUPER WHITE http biz lgservice com Ref No GR L247HVBA ...

Page 2: ...VER COLD AT FREEZING ROOM 49 PWB PARTS DRAWING AND LIST 53 PWB CIRCUIT DIAGRAM 63 ICE MAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD 67 WORKING PRINCIPLES 67 FUNCTION OF ICE MAKER 68 ICE MAKER TROUBLESHOOTING 71 ICE MAKER CIRCUIT PART 72 CIRCUIT 73 TROUBLE DIAGNOSIS 75 TROUBLE SHOOTING 75 FAULTS 85 COOLING CYCLE HEAVY REPAIR 102 HOW TO DEAL WITH CLAIMS 109 HOW TO DISASSEMBLE AND ASSEMBL...

Page 3: ...em 7 Make sure the hook is correctly engaged Remove dust and foreign materials from the housing and connecting parts 8 Do not fray damage machine heavily bend pull out or twist the power cord 9 Please check the evidence of moisture intrusion in the electrical components Replace the parts or mask it with insulation tapes if moisture intrusion was confirmed 10 Do not touch the icemaker with hands or...

Page 4: ...ire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 10G 310 cc CAPILLARY TUBE ID 0 83 DRIER MOLECULAR SIEVE XH 7 ITEMS SPECIFICATIONS FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath ANTI SWEAT HEATER Dispenser Duct Door Heater Dispenser Heater Home Bar Heater ANTI FREEZING HEATER Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 1 EA DISPENSER LAMP ...

Page 5: ...ire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 10G 310 cc CAPILLARY TUBE ID 0 83 DRIER MOLECULAR SIEVE XH 7 1750 1720 1750 602 948 890 662 711 760 1135 5 Front View Plane View 2 Ref No GR P207 ITEMS SPECIFICATIONS FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath ANTI SWEAT HEATER Dispenser Duct Door Heater Dispenser Heater Home Bar Heater ANTI FREEZING ...

Page 6: ...DENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 10G 310 cc CAPILLARY TUBE ID 0 83 ITEMS SPECIFICATIONS DRIER MOLECULAR SIEVE XH 7 FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath ANTI SWEAT HEATER Dispenser Duct Door Heater Dispenser Heater ANTI FREEZING HEATER Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 1 EA DISPENSER LAMP 15W 1 EA...

Page 7: ...DENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 10G 310 cc CAPILLARY TUBE ID 0 83 1750 1720 1750 602 948 890 662 711 760 1135 5 Front View Plane View 4 Ref No GR L207 ITEMS SPECIFICATIONS DRIER MOLECULAR SIEVE XH 7 FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath ANTI SWEAT HEATER Dispenser Duct Door Heater Dispenser Heater ANTI FREEZING HEATER D...

Page 8: ... Tube Type CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 10G 310 cc CAPILLARY TUBE ID 0 83 DRIER MOLECULAR SIEVE XH 7 ITEMS SPECIFICATIONS FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath ANTI SWEAT HEATER Home Bar Heater ANTI FREEZING HEATER Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 1 EA DISPENSER LAMP 15W 1 EA 1750 1720 175...

Page 9: ... Tube Type CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 10G 310 cc CAPILLARY TUBE ID 0 83 DRIER MOLECULAR SIEVE XH 7 1750 1720 1750 602 948 890 662 711 760 1135 5 Front View Plane View 2 Ref No GR C207 ITEMS SPECIFICATIONS FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath ANTI SWEAT HEATER Home Bar Heater ANTI FREEZING HEATER Damper Heater F...

Page 10: ...ype EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 10G 310 cc CAPILLARY TUBE ID 0 83 ITEMS SPECIFICATIONS DRIER MOLECULAR SIEVE XH 7 FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath ANTI FREEZING HEATER Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 1 EA DISPENSER LAMP 15W 1 EA 1750 1720 1750 687 948 890 74...

Page 11: ...ype EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 10G 310 cc CAPILLARY TUBE ID 0 83 ITEMS SPECIFICATIONS DRIER MOLECULAR SIEVE XH 7 FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath ANTI FREEZING HEATER Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 1 EA DISPENSER LAMP 15W 1 EA 1750 1720 1750 602 948 890 66...

Page 12: ...ch Meats Vegetables Humidity Switch Freezer Compartment Refrigerator Compartment Cover Lamp R U Shelf Egg Box Snack Corner Vegetable Box Miracle Zone Optional Adjust Screw Basket Cover Home Bar Cover Lamp R L Shelf Guide Bottle Wine Rack Cover Lamp F Shelf F Drawer Cover Lower Adjust Screw Cover Dairy Ice Bank Assembly Ice Shelf Assembly Door Rack 1 Ref No GR P247 GR P207 ...

Page 13: ...nversion Switch Meats Vegetables Humidity Switch Freezer Compartment Refrigerator Compartment Cover Lamp R U Shelf Egg Box Snack Corner Adjust Screw Basket Cover Home Bar Cover Lamp R L Shelf Guide Bottle Wine Rack Shelf F Drawer Cover Lower Adjust Screw Cover Dairy Cover Lamp F Door Rack Vegetable Box Adjust Screw Ice Bank Assembly Ice Shelf Assembly Miracle Zone Optional ...

Page 14: ...elf Egg Box Snack Corner Vegetable Box Adjust Screw Basket Cover Lamp R L Shelf Guide Bottle Wine Rack Shelf F Drawer Cover Lower Adjust Screw Cover Dairy Frame Display Dispenser Lamp Ice Water Dispenser Button Cover Hinge Cover PWB Back Handle Water Tube Cover Lamp F Door Rack Ice Bank Assembly Ice Shelf Assembly Miracle Zone Optional 3 Ref No GR L247 GR L207 ...

Page 15: ...t Cheese Veg Humidity Switch Freezer Compartment Refrigerator Compartment Conversion Switch Meats Vegetables Cover Lamp R U Shelf Egg Box Snack Corner Vegetable Box Adjust Screw Basket Cover Lamp R L Shelf Guide Bottle Wine Rack Shelf F Drawer Cover Lower Adjust Screw Cover Dairy Cover Lamp F Door Rack Ice Bank Assembly Ice Shelf Assembly Miracle Zone Optional ...

Page 16: ... Cover Home Bar Shelf Cover Lamp R L Guide Bottle Wine Rack Back Handle Shelf F Drawer Cover Lower Adjust Screw Cover Dairy Control Box R Cover Hinge Home Bar Conversion Switch Meats Vegetables Humidity Switch Freezer Compartment Refrigerator Compartment Frame Display Ice Bank Assembly 1 Ref No GR C247 GR C207 ...

Page 17: ...Box Snack Corner Vegetable Box Adjust Screw Basket Shelf Cover Lamp R L Guide Bottle Wine Rack Shelf F Drawer Cover Lower Adjust Screw Cover Dairy Control Box R Conversion Switch Meats Vegetables Humidity Switch Freezer Compartment Refrigerator Compartment Ice Bank Assembly 3 Ref No GR B247 GR B207 ...

Page 18: ...he height of freezer door is higher than that of refrigerator compartment Insert a driver into the groove of adjusting screw and rotate driver in arrow direction clockwise until the refrigerator becomes horizontal Insert a driver into the groove of adjusting screw and rotate driver in arrow direction clockwise until the refrigerator becomes horizontal HOW TO INSTALL REFRIGERATOR 18 Adjusting Screw...

Page 19: ...firm the following installation parts HOW TO INSTALL REFRIGERATOR 19 Class Shape and Spec Nomenclature P No Remarks Valve Feed 5221JA3001A Common Use Connector MECH Pipe 4932JA3003A Conversion Connector 3 4 6631JA3004A No Holes Balance Conector 3 4 6631JA3004B Packing ø24x3t 3920JA3001B Connector MECH Pipe 4932JA3003B Conversion Connector W25 6631JA3004C No Holes Balance Conectoor W25 6631JA3004D ...

Page 20: ...nser button for 2 3 minutes and confirm that the water comes out Caution Feed pipe should be connected to cold water line If it is connected to hot water line trouble may occur Please check rubber packing when connecting feed pipe 2 Check leakage at connecting part then arrange water tube and locate the refrigerator at its regular place if there is no leaking HOW TO INSTALL REFRIGERATOR 20 Single ...

Page 21: ...se standard feed tube to prevent leaking Outternal Filter 1 Filter Fixation 1 Connect feed tube to the filter outlet and water valve connecting tube 2 Fix the filter at proper place around the sink where it is easy to replace the filter and to receive the cleaning water Please consider the length of tube shall be less than 12m when locating filter 3 When fixing the filter use fixing plate and cabl...

Page 22: ...ontrol box and fasten it by turning it clockwise by 90 degrees Note Check that the guideline and the fastening indication line are aligned 2 Replacement of water filter While holding the lower part of the filter turn it counterclockwise by 90 degrees and pull it down Note Check that the guideline and the loosening indication line are aligned After installing water filter Reassemble the lamp cover ...

Page 23: ...d ice tray rotates and water comes out from the icemaker water tube 3 The water shall be supplied two or three times into the tray The amount of water supplied for each time is small Put a water container under the ice tray and press test switch 4 When ice tray rotates the water in it will spill Collect the spilt water and throw away into the sink 5 When ice tray has finished rotation water comes ...

Page 24: ...ice cube is too small increase the water supplying time This happens when too small water is supplied into the ice tray 4 If ice cube sticks together decrease the water supplying time This happens when too much water is supplied into the ice tray Caution When adjusting the amount of water supplied adjust step by step Otherwise the water may spill over 3 When adjustment of control switch for the am...

Page 25: ...as above after using refrigerator for minimum 2 3 days MICOM FUNCTION 25 Super freezer Dispenser selection button Temperature adjustment button for refrigerator compartment Lock button Filter reset button Temperature adjustment button for freezer compartment ON WATER TEMP TEMP FILTER STATUS ROOM TEMP LOCK UNLOCK 6 5 4 3 2 1 FILTER RESET PUSH 3 SEC H M L CUBED CRUSHED OFF SUPER FRZ DISPENSER FRZ TE...

Page 26: ...1 4 Lock function display button lock 1 In power application of refrigerator the only Release text is turned on at the right side of lock graphic of LCD with the lock release status 2 If desiring to lock the display status and pressing the lock release button once Release text is turned off at the right side of lock graphic of LCD and Lock text is turned on with lock status 3 The buzzer sound and ...

Page 27: ... ice lumps out of the ice storage bin break them into small pieces and then place them into the ice storage bin again When the ice maker produces too small or lumped together ice the amount of water supplied to the ice maker need to adjusted Contact the service center If ice is not used frequently it may lump together Power failure Ice may drop into the freezer compartment Take the ice storage bin...

Page 28: ...ction of desired foods kept in the Miracle Zone from vegetables to meat with a display Set temperature in the Miracle Zone by using a separate selection button at the right side of the Miracle Zone Initial notch is in veg status in application of power Whenever pressing buttons notch changes while LED is displayed in the order of veg cheeze meat veg Provided that selected notch LED turns off if op...

Page 29: ... 1 If pressing the test button in the main PCB Phi sound rings 2 In selecting compulsory operation alarm sound is repeated and completed in the cycle of On for 0 2 second and Off for 1 8 second three times 3 In selecting compulsory frost removal alarm sound is repeated and completed in the cycle of On for 0 2 second Off for 0 2 second On for 0 2 second and Off for 1 4 second three times 2 14 Frost...

Page 30: ... COMP operates after 7 minutes When temperature of a frost removal sensor becomes less than 45 C In power failure service Test mode 1 Compulsory function Test mode 2 Compulsory frost removal POWER ON COMP ON F FAN C FAN ON R STEP MOTOR DAMPER ON HOME BAR HEATER ON MIRACLE ZONE STEP DAMPER MOTOR ON FROST REMOVAL HEATER OFF HOME BAR HEATER ON HOME BAR HEATER OFF FROST REMOVAL HEATER ON DAMPER DUCTDO...

Page 31: ...f failure Freezing BLDCmotor Compressor Stepping motordamper Defrost Heater Cooling BLDCmotor Product operation status in failure Abnormal freezer sensor Abnormalrefrigerator sensor1 R1 Upperpartinthe refrigerator compartment Abnormalrefrigerator sensor2 R2 Upperpartinthe refrigerator compartment Abnormal defrost sensor Failed defrosting Abnormalfreezing BLDCmotor Abnormalcooling BLDCmotor Abnorma...

Page 32: ...et to the normal status 3 Function adjustment button is not perceived during performance of test mode 4 In finishing test mode always pull the power cord out and then plug in it again for the normal state 5 If nonconforming contents such as sensor failure are found during performance of test mode release the test mode and display the failure code 6 Even if pressing the test button during failure c...

Page 33: ...ispenser Lamp On Off function Lamp on the dispenser part is turned on if pressing the dispenser press switch after selecting ice cube ice crushed ice or water If detaching the hands it is turned off 6 Selection function of water crushed cube ice 1 This is function to allow selection of water crushed cube ice function depending on user s selection Display and selection is done if pressing the dispe...

Page 34: ...nsformer transferring energy of the primary side of the switching terminal to the secondary side and the feedback part IC3 IC4 transferring it to the primary side Caution Since high voltage DC310V is maintained at the power terminal please take a measure after more than 3 minutes have passed after removing power cords in the abnormal operation of a circuit Voltage of every part is as follows EXPLA...

Page 35: ...circuit The reset circuit is circuit allowing various parts such as RAM inside of MICOM IC1 to initialize and the whole of function to start from the initial status when initial power is input or when power is applied again to MICOM by a spontaneous power failure LOW voltage is applied to the reset terminal of MICOM in the beginning of power supply for a constant time 10ms Reset terminal during ge...

Page 36: ...n sensing circuit in parallel toward both ends of switch to determine door open at MICOM Since a door switch of the home bar is connected to door switch C D of the cold storage room it senses door opening if even one of both is opened The fan motor is immediately stop if opening doors of the freezing room or cold storage room at the TEST mode and it immediately operates if closing them 1 GR P247 L...

Page 37: ...r cold storage room are connected to the door open sensing circuit toward both ends of switch to determine door open at MICOM Since a door switch of the home bar is connected to door switch C D of the cold storage room it senses door opening if even one of both is opened EXPLATION FOR MICOM CIRCUIT 37 Measuring part IC7 No 16 No 11 No 10 No 15 No 14 Status ON Within 1 V OFF 12 V Type of Load COMP ...

Page 38: ...t EXPLATION FOR MICOM CIRCUIT 38 Measuring part Lever S W IC1 Micom No 16 On Press OFF 5V 0 V 60 Hz 5 V Measuring part IC6 11 IC6 10 IC7 16 IC7 15 IC7 13 IC7 14 Status ON Within 1 V OFF 12 V Type of Load GEARED MOTOR SOLENOID CUBE WATER VALVE ICE WATER SOLENOID DISPENSER SOLENOID PILOT ...

Page 39: ... in the failure of switch at both ends of A and B or in failure of the L wire Lamp does at the cold storage room not turn on if the door switch of the cold storage room fails to sense the door open switch C D or the home bar switch EXPLATION FOR MICOM CIRCUIT 39 Closing 5 V A B C D S W at both ends are at Off status Opening 0 V A B C D S W at both ends are at On status Measuring part IC1 MICOM No ...

Page 40: ...evaporator for sensing temperature of a frost removal sensor necessary for frost removal Short or open status of every temperature sensor is as follows EXPLATION FOR MICOM CIRCUIT 40 SENSOR CHECK POINT NORMAL 30 C 50 C IN SHORT IN OPEN Freezing sensor POINT A Voltage Frost removal sensor POINT B Voltage Cold storage sensor 1 POINT C Voltage 0 5 V 4 5 V 0 V 5 V Cold storage sensor 2 POINT D Voltage...

Page 41: ...n evaporator for sensing temperature of a frost removal sensor necessary for frost removal Short or open status of every temperature sensor is as follows EXPLATION FOR MICOM CIRCUIT 41 A B C D E R J1 R J2 SENSOR CHECK POINT NORMAL 30 C 50 C IN SHORT IN OPEN Freezing sensor POINT A Voltage Frost removal sensor POINT B Voltage Cold storage sensor 1 POINT C Voltage 0 5 V 4 5 V 0 V 5 V Cold storage se...

Page 42: ...1 GR P247 L247 P207 L207 2 GR C247 B247 C207 B207 The above circuits are used for designating separation by model as option and notifying it to MICOM Designation of option by model and the application standards are as follows u These circuits are accurately pre adjusted in shipment from factory and so you must not additionally add or remove option EXPLATION FOR MICOM CIRCUIT 42 Separation Connecti...

Page 43: ... terminal of MICOM PIN 33 34 and 35 as shown in wave form of the following part These signals are output to the output terminal No 10 11 14 15 via the input terminal No 3 6 8 of the IC10 TA7774P as IC for motor driving Output signals allow motor coils wound on each phase of stator to form rotation magnetic field and the motor to rotate Inputting as below figure to the input terminal INA INB as IC ...

Page 44: ...rm a temporary change of speed for the fan motor and applies DC voltage up to 7 5V 16V to motor 3 This circuit performs function not to drive the fan motor further by cutting off power applied to the fan motor in the lock of fan motor by sensing the operation RPM of the fan motor 1 GR P247 L247 P207 L207 EXPLATION FOR MICOM CIRCUIT 44 b d part a part c part Motor OFF 5V 2V or less 2V or less Motor...

Page 45: ...2 GR C247 B247 C207 B207 EXPLATION FOR MICOM CIRCUIT 45 ...

Page 46: ... C Ex Now R J1 R J2 1 2kΩ RCRI 5 6kΩ want to compensate 2 C for Freezing room temperature and 2 C for Cold storage room temperature R J1 12kΩ 1kΩ R J2 12kΩ RCRI 5 6kΩ 18kΩ EXPLATION FOR MICOM CIRCUIT 46 R J1 R J2 Freezing room Cold storage room Resistance value Temperature Resistance value Temperature Remarks R J1 R J2 compensation RCR1 compensation 5 C 180 kΩ 2 5 C Warmly 4 C 56 kΩ 2 0 C compensa...

Page 47: ... 5 6 kΩ Down Down Down change Up Up Up Up Up Up Up 2 C 1 5 C 1 C 0 5 No 0 5 C 1 C 1 5 C 2 C 2 5 C 3 C Cold storage 8 2 kΩ Down Down Down Drop change Up Up Up Up Up Up room 2 5 C 2 C 1 5 C 1 C 0 5 C No 0 5 C 1 C 1 5 C 2 C 2 5 C RCR1 10 kΩ Down Down Down Down Down change Up Up Up Up Up 3 C 2 5 C 2 C 1 5 C 1 C 0 5 C No 0 5 C 1 C 1 5 C 2 C 12 kΩ Down Down Down Down Down Down change Up Up Up Up 3 5 C 3...

Page 48: ...C 7 C 8 C J2 compensate J1 1 8 kΩ 3 C 2 C 1 C Not 1 C 2 C 3 C 4 C 5 C 6 C 7 C J2 compensate J1 910 Ω 4 C 3 C 2 C 1 C Not 1 C 2 C 3 C 4 C 5 C 6 C Freezing J2 compensate room J1 5 C 4 C 3 C 2 C 1 C Not 1 C 2 C 3 C 4 C 5 C R J1 R J2 J2 compensate J1 6 C 5 C 4 C 3 C 2 C 1 C Not 1 C 2 C 3 C 4 C J2 1 2 kΩ compensate J1 7 C 6 C 5 C 4 C 3 C 2 C 1 C Not 1 C 2 C 3 C J2 2 4 kΩ compensate J1 8 C 7 C 6 C 5 C 4...

Page 49: ...ervice EXPLATION FOR MICOM CIRCUIT 49 Compensation Compensation for weak cold for over cold Temperature compensation value Remarks JCR3 JCR4 JCR1 JCR2 at cold storage room 0 C In shipment from factory CUT 1 C CUT 1 C CUT 1 C CUT 1 C CUT CUT 2 C CUT CUT 2 C CUT CUT 0 C CUT CUT 0 C CUT CUT 0 C CUT CUT 0 C CUT CUT CUT 1 C CUT CUT CUT 1 C CUT CUT CUT CUT 0 C Temperature compensation in CUT JCR1 1 C 2 ...

Page 50: ...acle Zone STEPPING MOTOR Display Miracle zone stepping motor damper is same as 1 8 stepping motor operation circuit and the miracle zone display turns on only when the R door opens 50 PCB ASSEMBLY MAGIC DISPLAY ...

Page 51: ...g the display PCB is required Poor communication occurs if a continuous information exchange fail to continue for more than 2 minutes between main MICOM of main PCB and LCD dedicated MICOM for LCD control of display PCB 1 GR P247 L247 P207 L207 EXPLATION FOR MICOM CIRCUIT 51 ON WATER TEMP TEMP FILTER STATUS ROOM TEMP LOCK UNLOCK 6 5 4 3 2 1 FILTER RESET PUSH 3 SEC H M L CUBED CRUSHED OFF PCB ASSEM...

Page 52: ...l be measured with a digital tester after separating CON8 of the PWB ASSEMBLY and the MAIN part u Resistance of the freezing sensor shall be measured with a digital tester after separating CON7 of the PWB ASSEMBLY and the MAIN part EXPLATION FOR MICOM CIRCUIT 52 Measuring Temperature C Freezing Sensor Cold storage sensor 1 2 Frost removal sensor Outside sensor 20 C 22 3 kΩ 77 kΩ 15 C 16 9 kΩ 60 kΩ...

Page 53: ...3 PWB parts diagram and list 3 1 PWB Assembly main part diagram 1 GR P247 L247 P207 L207 EXPLATION FOR MICOM CIRCUIT 53 ...

Page 54: ...2 GR C247 B247 C207 B207 EXPLATION FOR MICOM CIRCUIT 54 ...

Page 55: ...3 2 Parts list 1 GR P247 L247 P207 L207 EXPLATION FOR MICOM CIRCUIT 55 ...

Page 56: ...EXPLATION FOR MICOM CIRCUIT 56 ...

Page 57: ...2 GR C247 B247 C207 B207 EXPLATION FOR MICOM CIRCUIT 57 ...

Page 58: ...EXPLATION FOR MICOM CIRCUIT 58 ...

Page 59: ...3 3 DISPLAY ASSEMBLY part diagram 1 GR P247 L247 P207 L207 EXPLATION FOR MICOM CIRCUIT 59 ...

Page 60: ...2 GR C247 B247 C207 B207 EXPLATION FOR MICOM CIRCUIT 60 ...

Page 61: ...3 4 DISPLAY circuit diagram 1 GR P247 L247 P207 L207 61 Parts without mark means SMD parts ...

Page 62: ...2 GR C247 B247 C207 B207 62 Parts without mark means SMD parts ...

Page 63: ...4 PWB circuit diagram PWB circuit diagram may vary a little bit depending on actual condition 1 GR P247 L247 P207 L207 EXPLATION FOR MICOM CIRCUIT 63 ...

Page 64: ...EXPLATION FOR MICOM CIRCUIT 64 PCB ASSEMBLY DISPLAY PCB ASSEMBLY MAGIC DISPLAY ...

Page 65: ...2 GR C247 B247 C207 B207 EXPLATION FOR MICOM CIRCUIT 65 ...

Page 66: ...EXPLATION FOR MICOM CIRCUIT 66 PCB ASSEMBLY DISPLAY PCB ASSEMBLY MAGIC DISPLAY ...

Page 67: ...be ice can be dispensed if there is ice in the ice bank 7 When dispenser water rubber button is pressed water valve opens and water is supplied if water valve is normally installed on the right side of the machine room 8 Ice and water are not available when freezer door is open ICEMAKERANDDISPENSEROPERATIONPRINCIPLEANDREPAIRMETHOD 67 Level Ice Maker Cube Mould for Initial Control after power is in...

Page 68: ...r supply water shall be supplied for the previous setting time But it will supply for the amended time from the next supply 4 When water supply signal is applied to water and ice valves at the same time during water supply water shall be supplied to water valve If water supply signal is applied to ice valve during water supply water shall be supplied to both water and ice valves 2 3 Ice Making Con...

Page 69: ... when ice ejection motor rotates in normal direction If there is no change in Hall IC signals within 1 minute after ice ejection motor operates ice ejection motor stops as ice ejection motor or hall IC is out of order 5 If ice ejection motor or Hall IC is abnormal ice ejection motor rotates in normal direction to exercise initial operation It resets the ice maker if ice ejection motor or Hall IC i...

Page 70: ...hen test function performs normally buzzer sounds and water supply shall carry out Check it for repair if buzzer does not sound 4 When water supply is completed the cycle operates normally as follows Ice making Ice ejection Returning to horizontal conditions Water supply 5 Remove ice from the ice maker cube mould and press test switch when ice maker cube mould is full of ice as ice ejection and wa...

Page 71: ...heck Failed Ice Maker Unit Is the resistance of both ends 9 10 of ice ejection motor of CON9 between 18 and 22Ω Is ice ejection motor drive circuit IC11 and peripheral circuits normal Defects between Hall IC and Board Pin No 42 of IC1 Confirm ice ejection and level return when pressing test switch Replace Ice Maker Unit Replace Main PWB Are ice ejection and level return normal when test switch is ...

Page 72: ...tch installed at the automatic ice maker itself for more than 0 5 second 2 The test switch operates in the horizontal status and test function is not input in the water supply operation Ice removal control and water supply control is not performed if full ice is arrived during the operation of test function 3 If pressing the test switch for 0 5 second or more in the horizontal status ice removal o...

Page 73: ...CIRCUIT 73 3854JD1103A ...

Page 74: ...CIRCUIT 74 3854JD1103A ...

Page 75: ...al Bad connection between plug and adapter faulty plug The distance between pins Pin outer diameter No power on power cord O L P is off No electric power on compressor Faulty compressor Faulty PTC Disconnectedcopperwire Internalelectricalshort Faultyterminalcontact Disconnected Capacity of O L P is small CharacteristicsofO L Pisbad Badconnection Poweris disconnected InnerNi Crwireblowsout Bad inte...

Page 76: ...eaveitintheair Moisturepenetration intotherefrigerationoil Capsaremissed Airblowing Duringtransportation During work Notperformed Performed Tooshorttime Lowairpressure Lessdryair AirBlowing Leaveitintheair Capsaremissed Shortpipeinsert Pipe gaps Toomuchsolder Toolarge Damagedpipes Notdriedinthecompressor Elapsedmorethan6monthsafterdrying Capsaremissed Nopressurewhenitisopen Duringresttime Afterwor...

Page 77: ...oreignmaterials penetration Cap drain is not disconnected Injectthroughthe hole Seal with drain P Ulumpinput Screw input Otherforeignmaterials input Parts disconnected Wire is cut Leadwire Heatingwire Contactpoint betweenheatingand electricwire Dentbyfinevaporator Heatingwireiscorroded Waterpenetration Badterminalconnection Check visually Check terminal Conduction OK No conduction NG If wire is no...

Page 78: ...cation thickness Structural fault Gasket gap Airinflowthroughthefanmotor Badinsulationofcasedoor SheathHeater rated Heaterplate rated Gap Badattachment Contraction Badadhesion Weakbindingforceathinge Fanmotor Door switch Selflocked Wireiscut Badterminalcontact Contact distance Buttonpressure Meltedcontact Contact Poordoor attachment Door liner dimension Contractioninner liner Misalignment Badtermi...

Page 79: ...is constrained Insufficient motorRPM Faultyfan Shorud Bent Iceandforeignmaterialsonrotatingparts Fanshroudcontact Clearance Dampingevaporatorcontact Accumulatedresidualfrost Fanmisuse Badshape Looseconnection Nottightlyconnected Insertdepth Ratingmisuse Smallcapacity Lowvaltage Malfunction of charging cylinder Wrongsettingofrefrigerant Insufficientcompressor Faultycompressor Fanoverload Fanmisuse ...

Page 80: ... U dump liquid Faulty contact Faulty temperature characteristics External air inflow Rubber motor assembly direction reverse Door opens but not closes Gap around gasket Contraction distortion loose door twisted corner not fully inserted Food vapor Storing hot food Unsealed food Door opens but not closes Gasket gap Cool air leak and transmitted Highambienttemperature Space is secluded Differentrati...

Page 81: ...r compartment operating sounds Compressor sound Sound from machine itself inserted Sound from vibration Restrainer Rubber Too hard seat Distorted Aged Burnt Stopper Bad Stopper Not fit assembly inner diameter of stopper Tilted Not Compressor base not connected Bad welding compressor stand fallen Foreign materials in the compressor compartment O L P sound Chattering sound Insulation paper vibration...

Page 82: ...nfault Coregap Bad connection Correct screw connection Bad assembly Distortion Foreignmaterialsinside Badconnection Partlydamaged Notconnected Badpipecaulking Normaloperatingsound Vibrationsound Agedrubberseat Badtorqueforassemblingmotor bracket Fanguidecontact Shroudburrcontact Dampingevaporatorcontact Residualfrostcontact Unbalance Iceonthefan Airintake oppositetomotor rubberassembly Supporterdi...

Page 83: ...Travlel distance Bad connection Bad terminal contact P U liquid leak 1 Lead wire is damaged Wire damage when assembling P T C Cover Outlet burr in the bottom plate Pressed by cord heater lead wire evaporator pipe 2 Exposed terminal Compressor Compartment terminal Touching other components Freezer compartment terminal Touching evaporator pipe 3 Faulty parts Transformer Coil contacts cover Welded te...

Page 84: ...tweendoorlinerandinnerliner Refrigerator compartmentis openedwhenfreezer compartmentis closed faultystopper High Faultydampercontrol Buttonissetat weak Doorisopen interferenceby food No deodorizer Poorcapacity Seal condition Storespecialodorousfood Longtermstorage Odorsfromchemicalprocucts Biggerdoorfoam Hinge Pintilted Poorflatness Nowasher Nogreaseandnotenough quantity Stopperwornout Badfreezerc...

Page 85: ... and products Replace with rated fuse Electricity leakage Check the resistance of power cord If fuse blowns out High voltage with testerf if it is 0Ω it is shorted frequently reconfirm Short circuit of components the cause and prevent tracking due to moisture and dust penetration Problems Causes Checks Measures Remarks Compressor Faulty PTC Check the resistance If resistance is infinite replace it...

Page 86: ...button faulty operation Confirm icing causes and repair switch operation Press button to check Replace door switch Faulty button pressure and contact Press button to check operation Door cannot press door switch Door sag fix door button Check visually Door liner bent replace door or attach sheets Bad radiation conditions in Check the clearance between the Keep clearance between The fan may be comp...

Page 87: ... pressure side 3 Check silver soldered parts Cu Fe Fe Fe 4 Check bending area of wire condenser pipe in compressor compartment cracks can happen during bending 5 Check other parts compressor compartment and evaporators in freezer compartment Shortage of refrigerant Check frost formation on the surface Find out the leaking area repair Drier must be replaced of evaporator in the freezer evacuate and...

Page 88: ...e weld If it is warm it s OK joints might be clogged If it is not condenser outlet weld Disconnect with torch remove the joints might be colgged causes evacuate and recharge seal refrigerant Leak at loop pipe weld joint Check sequence Replace the compressor weld Drier must be replaced discharge in compressor 1 Manually check whether evacuate and recharge refrigerant condenser is warm It is not war...

Page 89: ...impurities by inserting are clogged of ice insert the copper line copper wire Turn off more than 1 Impurities through the hole to check 3hours and pour in hot water if 2 Ice 2 Put hot water into the drain frost is severe check drains outside 2 Put in hot water to melt down frost 3 Check the water outlet 4 Push the heater plate to sucking duct manually and assemble the disconnected parts Gap betwee...

Page 90: ...k by inserting soft copper 3 Reassemble the heater plate wire into the duct soft and thin copper not to impair heating wire Bad cool air inflow and discharge 1 Turn on power open or close the 1 Check the faulty connector of and bad defrosting due to faulty door check that motor fan housing and reassemble wrongly contact and insertion bad connector operates If it operates motor fan assembled parts ...

Page 91: ...asket attachment Replacement should compartment Check door assembly conditions conditions and replace it be done when it Faulty gasket Door assembly and replacement cannot be repaired Faulty assembly 3 Overcooling in the refrigerator Check refrigerator compartment Replace faulty parts compartment is overcooled when button Faulty damper in the refrigerator pressed on weak compartment Check parts ar...

Page 92: ...artment door Check gasket attachment Correct the gasket attachement Replace when it can not Icing in the Faulty gasket conditions conditions and replace it be repaired shute Faulty assembly Check door assembly conditions Door assembly and replacement 3 Over freezing in the freezer Refrigerator operates pull down Replace defective parts compartment Check if it is operated Faulty MICOM intermittentl...

Page 93: ... inserting 6 Adjust fan to be in the center of conditions in pipes bell mouth of the fan guide 2 3 Touch pipes with hands or screw 7 Leve a clearance between driver check the change of interfering parts and seal gaps in sound the structures 8 Reassemble the parts which make 3 Fan operation sound in the freezer 3 1 Check fan insertion depth and sound compartment blade damage 9 Leave a clearance if ...

Page 94: ...ion with rubber 4 Moving wheel vibration 2 2 Check capillary tube touches and restrainer if it is severe 5 Other structure and parts cover back especially compressor and pipe vibration 3 1 Check compressor stopper 4 Replace compressor stopper if it vibration vibtates severely 4 1 Check vibration of front and rear moving wheels 5 1 Touch other structures and parts Irregular sound 1 It is caused by ...

Page 95: ...ain the principles of freezing cycles Water boiling or It happens when refrigerant passes Check the sound when compressor is Explain the principles of freezing cycles flowing sound orifice in accumulator internal pipes by turned on and refrigerant flowing phenomenon by the pressure difference between Check the sound when compressor is internal pressure difference condenser and evaporator turned of...

Page 96: ...nyl wraps Chedk food cleanliness Clean the refrigerator and set button at strong Plastic Odor Odors of mixed food and plastic Check wet food is wrapped with Clean the refrigerator odors plastic bowl and bag Persuade customers not to use It happens in the new refrigerator plastic bag or wraps with wet food or odorous foods Odor from the Odor from the old deodorizer Check the deodorizer odors Dry th...

Page 97: ...rts 7812 7805 terminals circuit in circuit explanation PCB electric terminal Check fuse in PCB electric Replace PCB fuse fuse is burnt out terminal with a tester STR Parts are Check if STR No 2 and 3 pins Replace parts Applicable to damaged are cut when power is off model with dispenser Abnormal Bad connection Lead Wire connecting Check Lead Wire terminals Reconnect Lead display LCD between Main P...

Page 98: ...nce characteristics table of sensor in circuit Freezer sensor is Confirm the color of sensor in Repair main PCB explanation substituted for other circuits main PCB sensor sensor housing sensor housing Defective freezer fan Fan motor lead wire Check fan motor lead wire Reconnect lead motor is cut with a tester wire Defective door switch Measure the voltage between Replace door Refer to load freezer...

Page 99: ...it explanation Foreign materials in Step Check Step Motor damper Remove foreign Motor damper baffles baffle visually materials Ice formation on Check if Step Motor damper Replace Step Motor Step Motor damper Heater wire is cut with a damper or refrigerator baffles tester control Box Assembly Defective refrigerator Defective refrigerator Check the resistance of Replace refrigerator Refer to sensor ...

Page 100: ... explanation Defective Buzzer Defective connecting lead wire from Check lead wire related to door Repair lead wire buzzer continuously main PCB to door switch switch with a tester rings or door Defective door switch parts Refer to door switch in parts repair Replace door switch opening alarm guide does not work Defective Buzzer does Key input wire is cut or bad connector Check input wire with a te...

Page 101: ...e associated with lever Repair lead wire dispenser are not Main PCB to lever switch switch with a tester dispensed Defective lever switch parts Refer to door switch in parts repair guide Replace lever switch Defective photo coupler IC parts Check voltage change at photo coupler Replace photo output terminals with lever switch coupler IC or PCB pressed It is OK if voltage change is between 0V 5V De...

Page 102: ...acuum Torr Below 0 03 ref Note Only applicable to the model degree equipped with reverse flow protect plate Vacuum EA High and low Vaccum efficiency can be improved by Pressure sides are operating compressor during evacuation evacuated at the same time for models above 200 L Vacuum EA Use R134a To protect The rubber pipes for R12 refrigerant shall piping exclusive mixing of be melted when they are...

Page 103: ...ile refrigerator operates scales punching off flier Weld carefully after inlet pinching gas welding machine Check leak at weld joints Electronic Leak Detector Minute leak Use electronic leak detector Driver Ruler Big leak Check visually or fingers Note Do not use soapy water for check Check cooling capacity Check radiator manually to see if warm Check hot line pipe manually to see if warm Check fr...

Page 104: ...l leak will happen 3 Replacement of drier 1 Be sure to replace drier with R134a only when repairing pipes and injecting refrigerant 4 Nitrogen blowing 1 Weld under nitrogen atmosphere in order to prevent oxidation inside a pipe welding Nitrogen pressure 0 1 0 2 kg cm2 5 Others 1 Nitrogen or refrigerant R134a only should be used when cleaning inside of cycle pipes inside and sealing 2 Check leakage...

Page 105: ...not necessary because it does not produce oxidized scales inside pipe because of its short welding time 3 Replacement of drier Inserting a capillary tube Measure distance with a ruler and put a mark 12 3 0 on the capillary tube Insert tube to the mark and weld it KEYPOINTING Observe the sequence for removal of refrigerant If not compressor oil may leak KEYPOINTING Welding without nitrogen blowing ...

Page 106: ...easure the weight Calculate the weight of refrigerant charged into the bombe by subtracting the weight of an evacuated bombe KEYPOINTING If power is applied during vacuum degassing vacuum degassing shall be more effective Operate compressor while charging refrigerant It is easier and more certain to do like this KEYPOINTING Be sure to charge the refrigerant at around 25 C Be sure to keep 5g in the...

Page 107: ...ndenser Drier Evaporator Bombe 1 Observe the safety precautions for gas handling 2 Use JIG or wet towel in order to prevent electric wires from burning during welding In order to prevent insulation break and accident 3 The inner case shall be melted and insulation material polyurethane shall be burnt if not cared during welding inner case parts 4 The copper pipe shall be oxidized by overheating if...

Page 108: ...razer Copper Silver Brazer Silver Brazer Copper Brazer Copper Brazer Copper Brazer Coppper Brazer Silver Brazer Copper Silver Brazer PIPE ASSEMBLY JOINT PIPE ASSEMBLY HOT LINE Freezer PIPE ASSEMBLY JOINT CONDENSER ASSEMBLY WIRE PIPE ASSEMBLY SUCTION DRIER ASSEMBLY CAPI TUBE Copper Brazer Copper Silver Brazer Silver Brazer Copper Brazer Copper Brazer Copper Brazer Coppper Brazer Silver Brazer 1 Asi...

Page 109: ... evaporator in the refrigerator compartment expand and contract as the temperature changes during the refrigerator operation This sound also happens during defrosting twice a day when the ice on the evaporator melts Clunk sound Explain that it comes from the compressor when the refrigerator starts When the refrigerator operates the piston and motor in the compressor rotate at 3600RPM This sound is...

Page 110: ...g also makes sound When water Noise from motor sounds Whizz freezes to ice freezing sounds such as click click are heard When ice is being ejected sounds like Whizz produced by a motor to rotate an ice tray and ice dropping and hitting ice bank sounds are also heard Noise when supplying water Explain the principles of water supplied to dispenser When the water supply button in the dispenser is pre...

Page 111: ...istics of ice cream The freezing point of ice cream is below 15 C Therefore ice cream may melt if it is stored in the door rack Store ice cream in a cold place or set the temperature control button of a freezer at strong position Refrigeration is too strong Check the position of temperature control button Check if refrigeration is strong in whole area of the refrigerator or partly near the outlet ...

Page 112: ...tton at strong Frost in the freezer compartment Explain the basic principles of frost formation The main causes for frosting Door was left open Air penetration through the gasket Too frequent door opening parties etc Hot foods are stored before they are cooled down The temperature of freezer is 19 C if temperature is set at MID If hot air comes into the refrigerator fine frost forms as cold air mi...

Page 113: ...ainer or in the wrap When is the power connected When should the power be connected You can connect the power right after the installation But if the refrigerator was laid flat during transportation for a long period of time and the refrigerant and compressor oils are mixed up then this will affect badly the performance of a refrigerator Be sure to connect the power 2 3 hours after refrigerator is...

Page 114: ...racket hinge pin is deformed during assembling freezer and refrigerator doors fix two screws Tap Tite Screw M6 Hinge L fixing screw in the hole of upper hinge 3 Disconnect upper hinge from a hinge supporter by grasping the front part of upper hinge and lifting up Hinge Assembly U in arrow direction A and pull forward in arrow B direction Be careful as the door may be fallen down 4 Lift up the free...

Page 115: ...Disassembly of shroud F U Disconnect housing of B after removing two rail guides with a blade screwdriver 7 Disassembly of shroud F U Hold upper part and pull forward 8 Check foam PU sticking conditions around a shroud F U and F L during assembling If damaged torn or badly sticked assemble with a new one after sealing well 4 ICEMAKER ASSEMBLY 1 Dispenser Model 1 How to disassemble 1 Remove ice ban...

Page 116: ... housing 4 Loosen four screws with a phillips screwdriver and pull a funnel Assembly to disconnect 5 Duct cap Assembly is disconnected if hold lever connecting screw is loosened with a phillips screwdriver 6 For assembling a duct cap assembly insert one end of a spring into the right hole of dispenser lever and insert the other end into the right hole in upper part of dispenser And then assemble a...

Page 117: ...Y 2 COVER DISPENSER 4 PWB PCB ASSEMBLY DISPLAY 7 FUNNEL ASSEMBLY 8 SWITCH MICRO 9 FRAME FUNNEL 10 LEVER SWITCH 11 FUNNEL 12 RUBBER FUNNEL 13 SWITCH ROCKER 14 SOLENOID ASSEMBLY 15 SPRING 16 HOLDER LEVER 17 CAP DUCT 19 LEVER DISPENSER 20 RUBBER CAP 21 BUTTON ASSEMBLY 22 BUTTON 23 HOLDER BUTTON 24 DECO DRAIN 17 Cap Assembly Duct Detailed Drawings ...

Page 118: ...r compartment door with a phillips screwdriver And loosen 4 screws and two screws Pull H Bar door Assembly forward to disassemble 3 Loosen two screws fixed on H Bar door Assembly and two screws with a cross driver to disassemble arm Assembly 4 Assemble parts by performing the disassembly in reverse order Note Assemble carefully parts until they are fixed firmly when assembling them Adjust exterior...

Page 119: ...FREEZER DOOR PART GR P247 GR P207 GR L247 GR L207 EXPLODED VIEW 119 206B 206A 202A 200A 210B 210A 203A 201A 210C 210C 205F 205B 205E 205A 205C 205D 205F 205B 205E 205A 205C 205D 206C 206E 206E EV ...

Page 120: ...EEZER DOOR PART GR C247 GR C207 GR B247 GR B207 EXPLODED VIEW 120 210A 210A 210A 210B 210B 206B 206A 203A 202A 201A 200A 280D 279B 279D 279A 280E 279C 501A 205F 205B 205E 205A 205C 205D 206C 206E 206E EV ...

Page 121: ...nal part EXPLODED VIEW 121 236A 232A 206B 266A 261A 240C 240C 240B 264C 264A 264B 240A 147A 402B 233A 230A 212G 243A 243A 262A 231A 265A 267A 263A 266B 260A 263B 266B 265A 267A 266C 266C 250A 241B 241C 241A 268C 268B 268A 266D 205F 205B 205E 205A 205C 205D 206D 206F EV ...

Page 122: ...L247 GR L207 GR B247 GR B207 REFRIGERATOR DOOR PART Optional part EXPLODED VIEW 122 236A 232A 206B 240C 240C 240A 240A 147A 233A 230A 212G 241A 243A 243A 231A 241B 241C 205F 205B 205E 205A 205C 205D 206D 206F EV ...

Page 123: ...PARTMENT Optional part EXPLODED VIEW 123 280A 281B 281A 103A 400A 312A 402A 152A 128E 128F 105B 282A 135B 128C 128D 105D 105C 135A 401A 408A 302B 130A 120C 125A 126A 120B 120B 137B 136D 136A 136B 403A 136C 137A EV ...

Page 124: ... 125A 126A 105D 105C 120B 280A 281B 281A 103A 400A 312A 402A 135A 401A 152A 128C 128D 105B 282A 130A 135B 131D 131C 131E 131B 131A 120B 132A 131F 120A 131G 128C 128D 120B 131C 131E 131B 131D 131J 132A 131H 137B 136D 136A 136B 403A 136C 137A 408A 302B EV ...

Page 125: ...1B 271C 402A 103A 152A 170A 272B 155A 151A 146A 626B 626A 626C 624A 151C 151B 150B 409B 166B 166A 165A 166C 166B 166A 165A 166C 116A 624C 115C 401A 115B 115A 150A 141A 171B 171A 141B 142A 168A 167A 504A 167B 120E 167C 141D 149C 167D 151E 140A 162A 162B 177A 177B EV ...

Page 126: ...A 621B 612A 612B 612C 615A 616B 616C 616A 613A 616E 623A 623A or 623B 618A 622A 616D 404A 620A 620B 616A 610A 610A 611A 611B 625A 616G 619A 601A 605A 602A 607A 600A 603A 510B 603B 604A 616F 627A 624B 619A 601A 605A 602A 604A 603B 603A 607A 600A 611A 611C 611D EV ...

Page 127: ...TMENT Optional part EXPLODED VIEW 127 300A 310B 307A 304A 306A 310A 317B 317A 305C 305B 313A 301A 307A 104A 305C 305B 303C 303B 303D 303A 305A 410G 500A 502B 502A 406A 308A 308C 308B 309C 403B 309B 309A 505A 410H EV ...

Page 128: ...DISPENSER PART EXPLODED VIEW 128 278A 278E 402C 278D 405A 275A 276A 275C 275B 401C 275D 281A 276B 277A 278B 278C 280C 280A 280B 501A 279D 279B 279A 279C 280E 280D 279E 278F EV ...

Page 129: ...P No 3828JD8704B AUG 2004 Printed in Korea ...

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LG LRSC21934SW, Service Manual

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