LG GR-B197DVCA Service Manual Download Page 46

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1-11. Key Button Input and Display Lighting Circuit

1. GR-P247, GR-P207, GR-L247, GR-L207

This circuit is to judge the work of function control button on the operation panel and to light each function indication led
(LED module). It is driven by SCAN method.

2. GR-C247, GR-C207, GR-B247, GR-B207, GR-B197

EXPLATION FOR MICOM CIRCUIT

- 46 -

FRZ

TEMP

REF

TEMP

SELECT

Max

Min

Summary of Contents for GR-B197DVCA

Page 1: ...PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK BEFORE CHECKING OR OPERATING THE REFRIGERATOR REFRIGERATOR SERVICE MANUAL MODEL GR B197DVCA COLOR SUPER WHITE http biz lgservice com Ref No GR B197DVCA ...

Page 2: ...VER COLD AT FREEZING ROOM 47 PWB PARTS DRAWING AND LIST 48 PWB CIRCUIT DIAGRAM 54 ICE MAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD 58 WORKING PRINCIPLES 58 FUNCTION OF ICE MAKER 59 ICE MAKER TROUBLESHOOTING 62 ICE MAKER CIRCUIT PART 63 CIRCUIT 64 TROUBLE DIAGNOSIS 66 TROUBLE SHOOTING 66 FAULTS 76 COOLING CYCLE HEAVY REPAIR 93 HOW TO DEAL WITH CLAIMS 100 HOW TO DISASSEMBLE AND ASSEMBLE...

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: ...EFRIGERANT R134a 180g LUBRICATING OIL FREOL 15G 320 cc DRIER 1Ø0 83 CAPILLARY TUBE MOLECULAR SIEVE XH 7 ITEMS SPECIFICATIONS FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath Heater L Cord ANTI SWEAT HEATER Dispenser Duct Door Heater Dispenser Heater Home Bar Heater ANTI FREEZING HEATER Water Tank Heater Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 1 EA...

Page 5: ...EFRIGERANT R134a 180g LUBRICATING OIL FREOL 15G 320 cc DRIER 1Ø0 83 CAPILLARY TUBE MOLECULAR SIEVE XH 7 1750 1720 1750 600 948 890 660 711 755 1133 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 Heater L Cord ANTI SWEAT HEATER Dispenser Duct Door Heater Dispenser Heater Home Bar Heater ANTI FREEZING HE...

Page 6: ...denser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 15G 320 cc DRIER 1Ø0 83 ITEMS SPECIFICATIONS CAPILLARY TUBE MOLECULAR SIEVE XH 7 FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath Heater L Cord ANTI SWEAT HEATER Dispenser Duct Door Heater Dispenser Heater ANTI FREEZING HEATER Water Tank Heater Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 1 EA DISPENS...

Page 7: ...denser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 15G 320 cc DRIER 1Ø0 83 ITEMS SPECIFICATIONS CAPILLARY TUBE MOLECULAR SIEVE XH 7 FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath Heater L Cord ANTI SWEAT HEATER Dispenser Duct Door Heater Dispenser Heater ANTI FREEZING HEATER Water Tank Heater Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 1 EA DISPENS...

Page 8: ...Type CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 15G 320 cc DRIER 1Ø0 83 CAPILLARY TUBE MOLECULAR SIEVE XH 7 ITEMS SPECIFICATIONS FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath Heater L Cord 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 1...

Page 9: ...Type CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 15G 320 cc DRIER 1Ø0 83 CAPILLARY TUBE MOLECULAR SIEVE XH 7 1750 1720 1750 600 948 890 660 711 755 1133 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 Heater L Cord ANTI SWEAT HEATER Home Bar Heater ANTI FREEZING HEATER Damper H...

Page 10: ...PORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 15G 320 cc DRIER 1Ø0 83 ITEMS SPECIFICATIONS CAPILLARY TUBE MOLECULAR SIEVE XH 7 FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath Heater L Cord ANTI FREEZING HEATER Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 1 EA DISPENSER LAMP 15W 1 EA 1750 1720 1750 685 948 ...

Page 11: ...PORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 15G 320 cc DRIER 1Ø0 83 ITEMS SPECIFICATIONS CAPILLARY TUBE MOLECULAR SIEVE XH 7 FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath Heater L Cord ANTI FREEZING HEATER Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 1 EA DISPENSER LAMP 15W 1 EA 1750 1720 1750 600 948 ...

Page 12: ...PORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 15G 320 cc DRIER 1Ø0 83 ITEMS SPECIFICATIONS CAPILLARY TUBE MOLECULAR SIEVE XH 7 FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath Heater L Cord ANTI FREEZING HEATER Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 1 EA DISPENSER LAMP 15W 1 EA 1750 1720 1750 600 948 ...

Page 13: ...Snack drawer Vegetable drawer Vegetable drawer Meat drawer Door rack Refreshment center optional Shelf Door rack Wine holder optional Lamp Drawer or Shelf optional Lower Cover Milk product corner Door rack Drawer Freezer Compartment Refrigerator Compartment Automatic ice maker Door rack Shelf Steel T Glass Frame Display Dispenser Lamp 1 Ref No GR P247ER GR P207ER ...

Page 14: ...ble drawer Vegetable drawer Meat drawer Door rack Refreshment center optional Shelf Door rack Wine holder optional Lamp Shelf Steel T Glass Drawer or Shelf optional Lower Cover Milk product corner Door rack Drawer Freezer Compartment Refrigerator Compartment Automatic ice maker Door rack Cover Hinge Home Bar Ice Water Dispenser Button Frame Display Dispenser Lamp ...

Page 15: ...ide bottle Shelf Door rack Wine holder optional Lamp Shelf Steel T Glass Drawer or Shelf optional Lower Cover Milk product corner Door rack Drawer Freezer Compartment Refrigerator Compartment Automatic ice maker Door rack Conversion Switch Meats Vegetables Cover Hinge Ice Water Dispenser Button Frame Display Dispenser Lamp 3 Ref No GR L247ER GR L207ER ...

Page 16: ...rawer Vegetable drawer Vegetable drawer Meat drawer Door rack Guide bottle Shelf Door rack Wine holder optional Lamp Shelf Steel T Glass Drawer or Shelf optional Lower Cover Milk product corner Door rack Drawer Freezer Compartment Refrigerator Compartment Automatic ice maker Door rack Cover Hinge Ice Water Dispenser Button Frame Display Dispenser Lamp ...

Page 17: ...drawer Vegetable drawer Meat drawer Door rack Refreshment center optional Shelf Door rack Wine holder optional Lamp Ice Bank Assy Shelf Steel T Glass Drawer or Shelf optional Lower Cover Milk product corner Door rack Drawer Freezer Compartment Refrigerator Compartment Door rack Cover Hinge Home Bar 1 Ref No GR C247EC GR C207EC ...

Page 18: ...drawer Vegetable drawer Vegetable drawer Meat drawer Door rack Shelf Door rack Wine holder optional Lamp Shelf Steel T Glass Drawer or Shelf optional Lower Cover Milk product corner Door rack Drawer Freezer Compartment Refrigerator Compartment Door rack Ice Bank Assy Cover Hinge 3 Ref No GR B247 GR B207 GR B197 ...

Page 19: ...eight of freezer door is higher than that of refrigerator compartment Insert a driver B into the groove A of adjusting screw and rotate driver in arrow direction clockwise until the refrigerator becomes horizontal Insert a driver B into the groove A of adjusting screw and rotate driver in arrow direction clockwise until the refrigerator becomes horizontal HOW TO INSTALL REFRIGERATOR 19 Adjusting S...

Page 20: ...firm the following installation parts HOW TO INSTALL REFRIGERATOR 20 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 21: ...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 21 Single ...

Page 22: ...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 23: ...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 a 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 and the top shelf of th...

Page 24: ...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 ou...

Page 25: ...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 26: ...not be indicate in the standard model GR P247 GR P207 GR L247 GR L207 GR C247 GR C207 GR B247 GR B207 GR B197 when refrigerator or home bar door is closed MICOM FUNCTION 26 FRZ Temp REF Temp SELECT Max Min Function Monitor Freezer compartment temperature control Button Refrigerator compartment temperature control Button Dispenser selection button 1 2 3 4 5 5 Max Max Min 4 3 2 1 FRZ Temp REF Temp D...

Page 27: ...r does not operate smoothly Ice is lumped together When ice is lumped together take the 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 to...

Page 28: ...F control by linking with the COMP 2 It controls at the single RPM without varying RPM 3 Failure sensing method is same as in fan motor of freezing fan motor refer to failure diagnosis function table for failure display 2 6 Door opening alarm 1 Buzzer generates alarm sound if doors are not closed even when more than a minute consecutively has passed with doors of freezing cold storage room or home...

Page 29: ...peration Sequence Remark In applying Initial power TEST MODE When temperature of a frost removal sensor becomes more than 25 C In purchase movement If error occurs during operation initial operation is not done If pressing switch once more in the test mode 2 or temperature of a frost removal sensor is more than 5 C it immediately returns to the test mode for initial operation COMP operates after 7...

Page 30: ...normal refrigerator sensor 1 R1 upper shelf in the refrigerator Abnormal refrigerator sensor 2 R2 lower shelf in the refrigerator Abnormal defrost sensor Faulty defrost Abnormal freezer BLDC fan motor Abnormal cooling BLDC fan motor Abnormal room temperature sensor Abnormal icemaker sensor Abnormal icemaker unit Freezer sensor is cut or short circuited Upper shelf refrigerator sensor is cut or sho...

Page 31: ... 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 code display test mode will not be performed MICOM FUNCTION 31 The rest of LEDs are all on Test 1 Test 2 Normal Conditions MODE HANDLING CONTEN...

Page 32: ...er 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 EXPLATION F...

Page 33: ...Reset 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 dur...

Page 34: ...orage room are connected to the door open 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 immediat...

Page 35: ...or 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 35 Measuring part IC7 No 10 No 11 No 12 No 14 No 16 Status ON Within 1 V OFF 12 V Type of Load COMP...

Page 36: ...MICOM CIRCUIT 36 Measuring part Lever S W IC1 Micom No 16 On Press OFF 5V 0 V 60 Hz 5 V Measuring part IC6 No 13 IC6 No 12 IC6 No 11 IC6 No 10 No 12 No 10 No 16 Status ON Within 1 V OFF 12 V Type of Load GEARED MOTOR SOLENOID CUBE WATER VALVE ICE WATER SOLENOID DISPENSER HOME BAR HEATER SOLENOID PILOT ...

Page 37: ...witch c d or the home bar switch EXPLATION FOR MICOM CIRCUIT 37 Closing 5 V A B C D S W at both ends are at Off status Opening 5 V A B C D S W at both ends are at On status Measuring part IC1 MICOM No 47 46 Pin Door of Freezing Cold Storage Room GR L207 GR L247 GR B197 GR B207 GR B247 GR L207 GR L247 GR B197 GR B207 GR B247 CONDITIONS Bell sounds when button on Beep sounds when warning MEASURING d...

Page 38: ...g or an 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 38 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...

Page 39: ...making or an 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 39 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 PO...

Page 40: ... GR L207 GR L247 2 GR B197 GR B207 GR B247 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 40 Separation Connection Stat...

Page 41: ...f 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 TA7774F 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 TA7774AF fo...

Page 42: ...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 L207 GR L247 EXPLATION FOR MICOM CIRCUIT 42 a d part b part e part c f part Motor OFF 5V 2V or less 2V or less 0 V Moto...

Page 43: ...2 GR B197 GR B207 GR B247 EXPLATION FOR MICOM CIRCUIT 43 ...

Page 44: ...nt resistance to 18 kΩ modified resistance temperature at the cold storage will increase by 1 C EXPLATION FOR MICOM CIRCUIT 44 Freezing room Cold storage room Resistance value Temperature Resistance value Temperature Remarks RCF1 compensation RCR1 compensation 180 kΩ 5 C 180 kΩ 2 5 C Warmly 56 kΩ 4 C 56 kΩ 2 0 C compensate 33 kΩ 3 C 33 kΩ 1 5 C 18 kΩ 2 C 18 kΩ 1 0 C 12 kΩ 1 C 12 kΩ 0 5 C 10 kΩ 0 C...

Page 45: ...wn Down change Up Up Up Up Up Up Up Up 1 5 C 1 C 0 5 C No 0 5 C 1 C 1 5 C 2 C 2 5 C 3 C 3 5 C 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 ...

Page 46: ...it is to judge the work of function control button on the operation panel and to light each function indication led LED module It is driven by SCAN method 2 GR C247 GR C207 GR B247 GR B207 GR B197 EXPLATION FOR MICOM CIRCUIT 46 FRZ TEMP REF TEMP SELECT R S T Max Min F1 F2 F3 F4 F5 R1 R2 R3 R4 R5 ...

Page 47: ...ice EXPLATION FOR MICOM CIRCUIT 47 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 C J...

Page 48: ...3 PWB parts diagram and list 3 1 PWB Ass y main part diagram 1 GR L207 GR L247 EXPLATION FOR MICOM CIRCUIT 48 ...

Page 49: ...2 GR B197 GR B207 GR B247 EXPLATION FOR MICOM CIRCUIT 49 ...

Page 50: ...3 2 Parts list 1 GR L207 GR L247 EXPLATION FOR MICOM CIRCUIT 50 ...

Page 51: ...EXPLATION FOR MICOM CIRCUIT 51 ...

Page 52: ...2 GR B197 GR B207 GR B247 EXPLATION FOR MICOM CIRCUIT 52 ...

Page 53: ...EXPLATION FOR MICOM CIRCUIT 53 ...

Page 54: ...4 PWB circuit diagram PWB circuit diagram may vary a little bit depending on actual condition 1 GR L207 GR L247 EXPLATION FOR MICOM CIRCUIT 54 ...

Page 55: ...EXPLATION FOR MICOM CIRCUIT 55 ...

Page 56: ...2 GR B197 GR B207 GR B247 EXPLATION FOR MICOM CIRCUIT 56 ...

Page 57: ...EXPLATION FOR MICOM CIRCUIT 57 ...

Page 58: ...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 58 Level Ice Maker Cube Mould for Initial Control after power is in...

Page 59: ...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 60: ... 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 61: ...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 62: ...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 63: ...ch 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 op...

Page 64: ...CIRCUIT 64 ...

Page 65: ...CIRCUIT 65 ...

Page 66: ...terminal 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 CapacityofO L Pissmall CharacteristicsofO L Pisbad Badconnection Poweris disconnected InnerNi Crwireblowsout Badint...

Page 67: ...Leaveitintheair Moisturepenetration intotherefrigerationoil Capsaremissed Airblowing Duringtransportation Duringwork Notperformed Performed Tooshorttime Lowairpressure Lessdryair AirBlowing Leaveitintheair Capsaremissed Shortpipeinsert Pipegaps Toomuchsolder Toolarge Damagedpipes Notdriedinthecompressor Elapsedmorethan6monthsafterdrying Capsaremissed Nopressurewhenitisopen Duringresttime Afterwork...

Page 68: ...inisnotdisconnected Injectthroughthe hole Sealwithdrain P Ulumpinput Screwinput Otherforeignmaterials input Parts disconnected Wireiscut Heatingwire Contactpoint betweenheating andelectricwire Dentbyfinevaporator Poorterminalcontacts Wireiscut Leadwire Heatingwire Contactpoint betweenheatingand electricwire Heatingwireiscorroded Waterpenetration Badterminalconnection Check visually Check terminal ...

Page 69: ...hefanmotor Badinsulationofcasedoor SheathHeater rated Heaterplate rated Heatercord L rated Heaterplate Heatercord L Gap Badattachment Contraction Badadhesion Weakbindingforceathinge Fanmotor Doorswitch Selflocked Wireiscut Badterminalcontact Contactdistance Buttonpressure Meltedcontact Contact Poordoor attachment Doorliner dimension Contractioninner liner Misalignment Badterminal connection P Uliq...

Page 70: ...anis constrained Insufficient motorRPM Faultyfan Shorud Bent Iceandforeignmaterialsonrotatingparts Fanshroudcontact Clearance Dampingevaporatorcontact Accumulatedresidualfrost Fanmisuse Badshape Looseconnection Nottightlyconnected Insertdepth Ratingmisuse Smallcapacity Lowvaltage Malfunctionofchargingcylinder Wrongsettingofrefrigerant Insufficientcompressor Faultycompressor Fanoverload Fanmisuse B...

Page 71: ...erials P 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 Spaceissecluded Differe...

Page 72: ...ssor 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 vibrat...

Page 73: ...ownfault Coregap Badconnection Correctscrewconnection Badassembly Distortion Foreignmaterialsinside Badconnection Partlydamaged Notconnected Badpipecaulking Normaloperatingsound Vibrationsound Agedrubberseat Badtorqueforassemblingmotor bracket Fanguidecontact Shroudburrcontact Dampingevaporatorcontact Residualfrostcontact Unbalance Iceonthefan Airintake oppositetomotor rubberassembly Supporterdiso...

Page 74: ...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 75: ...betweendoorlinerandinnerliner Refrigerator compartmentis openedwhenfreezer compartmentis closed faultystopper High Faultydampercontrol Buttonissetat weak Doorisopen interferenceby food Nodeodorizer Poorcapacity Sealcondition Storespecialodorousfood Longtermstorage Odorsfromchemicalprocucts Biggerdoorfoam Hinge Pintilted Poorflatness Nowasher Nogreaseandnotenough quantity Stopperwornout Badfreezerc...

Page 76: ...d 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 i...

Page 77: ...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 78: ...w 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 an...

Page 79: ...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 80: ...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 81: ...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 82: ... gasket 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 ...

Page 83: ...partment 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 intermittent...

Page 84: ...r 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 85: ...tion 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 86: ...lain 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 o...

Page 87: ...inyl 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 t...

Page 88: ... 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 LED between Main PCB ...

Page 89: ...stics 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 refrigerator ...

Page 90: ...ion Foreign materials in AC Check AC damper baffle Remove foreign damper baffles visually materials Ice formation on AC Check if AC damper Heater Replace AC damper damper baffles wire is cut with a tester or refrigerator control Box Assy Defective refrigerator Defective refrigerator Check the resistance of Replace refrigerator Refer to sensor sensor sensor parts refrigerator sensor with a tester s...

Page 91: ... 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 92: ... 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 Def...

Page 93: ...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 94: ...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 95: ... 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 96: ... is 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 blow...

Page 97: ...d measure 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 ...

Page 98: ...ser Drier Evaporator Bombe Rubber 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...

Page 99: ...OINT PIPE ASSY HOT LINE Freezer PIPE ASSY HOT LINE Refrigerator PIPE ASSY JOINT CONDENSER ASSY WIRE PIPE ASSY SUCTION DRIER ASSY CAPI TUBE Copper Brazer Copper Brazer Silver Brazer Copper Brazer Copper Brazer Copper Brazer Coppper Brazer Silver Brazer Copper Brazer ...

Page 100: ... 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 101: ...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 102: ...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 103: ...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 104: ...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 105: ...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 a from a hinge supporter b by grasping the front part of upper hinge and lifting up Hinge Assy 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 106: ...rews 6 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 ASSY 1 Dispenser Model 1 How to disassemble 1 Remove ice ...

Page 107: ...e Assy housing 4 Loosen four screws with a phillips screwdriver and pull a funnel Assy to disconnect 5 Duct cap Assy is disconnected if hold lever connecting screw is loosened with a phillips screwdriver 6 For assembling a duct cap Assy 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 holde...

Page 108: ... DISPLAY 2 COVER DISPENSER 4 PWB PCB ASSY DISPLAY 7 FUNNEL ASSY 8 SWITCH MICRO 9 FRAME FUNNEL 10 LEVER SWITCH 11 FUNNEL 12 RUBBER FUNNEL 13 SWITCH ROCKER 14 SOLENOID ASSY 15 SPRING 16 HOLDER LEVER 17 CAP DUCT 19 LEVER DISPENSER 20 RUBBER CAP 21 BUTTON ASSY 22 BUTTON 23 HOLDER BUTTON 24 DECO DRAIN 17 Cap Assy Duct Detailed Drawings ...

Page 109: ...ator compartment door with a phillips screwdriver And loosen 4 screws b and two screws c Pull H Bar door Assy a forward to disassemble 3 Loosen two screws j i fixed on H Bar door Assy and two screws k with a cross driver to disassemble arm Assy 4 Assemble parts by performing the disassembly in reverse order Note Assemble carefully parts g j k until they are fixed firmly when assembling them Adjust...

Page 110: ...FREEZER DOOR PART GR P247 GR P207 GR L247 GR L207 EXPLODED VIEW 110 202A 200A 210C 210B 210A 210C 201A 203A 206B 206A 206C 206E 205C 205B 205D 205C 205A 205B 205A 205F ...

Page 111: ...FREEZER DOOR PART GR C247 GR C207 GR B247 GR B207 GR B197 EXPLODED VIEW 111 202A 200A 210B 210B 210B 210C 201A 203A 210C 206B 206A 206C 206E 205C 205B 205D 205C 205A 205B 205A 205F ...

Page 112: ... Optional part EXPLODED VIEW 112 232A 266A 261A 265A 267A 263A 266B 240C 240C 240B 264C 264A 264B 240A 147A 260A 263B 266B 265A 267A 402B 266C 266C 231A 233A 230A 234A 243A 243A 241B 241A 262A 147B 147C 236A 206B 206D 206F 205C 205B 205D 205C 205A 205B 205A 205F ...

Page 113: ...07 GR B247 GR B207 GR B197 REFRIGERATOR DOOR PART Optional part EXPLODED VIEW 113 233A 232A 240C 240C 240A 240A 147A 231A 230A 234A 243A 243A 241B 241A 147B 147C 236A 206B 206D 206F 205C 205B 205D 205C 205A 205B 205A 205F ...

Page 114: ...nal part EXPLODED VIEW 114 270A 271B 271A 320A 320C 302A 103A 400A 312A 402A 137A 136C 136A 135A 136B 136C 403A 401A 152A 128C 128D 131B 131A 125A 125A 105B 272A 130A 120B 120B 120D 120B 120A 135B 408A 320A 320B 408B 121A 101A ...

Page 115: ...1A 402A 145A 145A 103A 152A 116A 410A 115B 401A 150A 162A 162B 177A 140C 140D 140A 171B 141C 141D 171A 170C 170B 141A 170A 140C 140D 140A 166B 166A 165C 160D 165A 161A 160C 160D 160B 160A 272B 151C 155A 146A 626B 626A 626C 624C 624A 177B 115A 101B 151D 151E 160B or 165B ...

Page 116: ...EXPLODED VIEW 116 404B 614A 606A 610A 621B 612A 612B 612C 615A 616B 616C 616A 613A 616E 623A 623A or 623B 618A 622A 616D 404A 620A 620B 616A 611A 625A 616G 619A 601A 605A 602A 607A 600A 603A 510B 603B 604A 616F 627A 617A 624B 619A ...

Page 117: ...art EXPLODED VIEW 117 300A 310B 307A 304A 306A 310A 317B 317A 305C 305B 313A 301A 306C 306D 307A 104A 305C 305B 303C 303B 303D 303A 305A 407B 500A 502B 502A 411A 308A 308C 308B 309B 403B 309B 309A 306C 105C 105D 105E 505A 105F 407A ...

Page 118: ...DISPENSER PART EXPLODED VIEW 118 278A 278E 278F 402C 278D 405A 275A 276A 275C 401C 275D 275B 281A 276B 280C 280A 207A 277A 280B 278B 278C 279A 501A ...

Page 119: ...P No 3828JD8536Z MAR 2003 Printed in Korea ...

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LG GR-B197DVCA, Service Manual

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