LG GC-L227 Service Manual Download Page 38

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Temperature compensation table at the refrigerator is as follows:

Temperature compensation at the freezer is performed the same as at the refrigerator. The value for the freezer is twice
that of the refrigerator.

This circuit enters the necessary level of temperature compensation for adjusting the appliance. The method is the same
for every model in this appliance family.

EXPLATION FOR MICOM CIRCUIT

- 36 -

470

Ω

2 k

Ω

3.3 k

Ω

5.6 k

Ω

8.2 k

Ω

10 k

Ω

12 k

Ω

18 k

Ω

33 k

Ω

56 k

Ω

180 k

Ω

0.5 °C

1 °C

1.5 °C

2 °C

2.5 °C

3 °C

3.5 °C

4 °C

4.5 °C

5 °C

470

Ω

[0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F] [6.3 °F] [7.2 °F] [8.1 °F]

[9 °F]

change

0.5 °C

1 °C

1.5 °C

2 °C

2.5 °C

3 °C

3.5 °C

4 °C

4.5 °C

2 k

Ω

[0.9 °F]

[0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F] [6.3 °F] [7.2 °F]

[8.1 °F]

Down

change

1 °C

0.5 °C

1 °C

1.5 °C

2 °C

2.5 °C

3 °C

3.5 °C

4 °C

3.3 k

Ω

[1.8 °F] [0.9 °F]

[0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F] [6.3 °F]

[7.2 °F]

Down

change

1.5 °C

1 °C

0.5 °C

1 °C

1.5 °C

2 °C

2.5 °C

3 °C

3.5 °C

5.6 k

Ω

[2.7 °F] [1.8 °F] [0.9 °F]

[0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F]

[6.3 °F]

Down

change

2 °C

1.5 °C

1 °C

0.5 °

0.5 °C

1 °C

1.5 °C

2 °C

2.5 °C

3 °C

8.2 k

Ω

[3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]

[0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F]

[5.4 °F]

Refrigerator

Down

Drop

change

(RCR1)

2.5 °C

2 °C

1.5 °C

1 °C

0.5 °C

1 °C

1.5 °C

2 °C

2.5 °C

10 k

Ω

[4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]

[0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F]

[4.5 °F]

Down

change

3 °C

2.5 °C

2 °C

1.5 °C

1 °C

0.5 °C

1 °C

1.5 °C

2 °C

12 k

Ω

[5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]

[0.9 °F] [1.8 °F] [2.7 °F]

[3.6 °F]

Down

change

3.5 °C

3 °C

2.5 °C

2 °C

1.5 °C

1 °C

0.5 °C

1 °C

1.5 °C

18 k

Ω

[6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]

[0.9 °F] [1.8 °F]

[2.7 °F]

Down

change

4 °C

3.5 °C

3 °C

2.5 °C

2 °C

1.5 °C

1 °C

0.5 °C

1 °C

33 k

Ω

[7.2 °F] [6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]

[0.9 °F]

[1.8 °F]

Down

change

4.5 °C

4 °C

3.5 °C

3 °C

2.5 °C

2 °C

1.5 °C

1 °C

0.5 °C

56 k

Ω

[8.1 °F] [7.2 °F] [6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]

[0.9 °F]

Down

change

5 °C

4.5 °C

4 °C

3.5 °C

3 °C

2.5 °C

2 °C

1.5 °C

1 °C

0.5 °C

180 k

Ω

[9 °F]

[8.1 °F] [7.2 °F] [6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]

Down

change

Modification

resistance

Current
resistance

Summary of Contents for GC-L227

Page 1: ...ION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK BEFORE CHECKING OR OPERATING THE REFRIGERATOR REFRIGERATOR SERVICE MANUAL MODEL GR P227 L227 COLOR TITANIUM http eic lgservice com GR P257 L257 ...

Page 2: ...OM CIRCUIT 26 EXPLANATION FOR PWB CIRCUIT 26 ICE MAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD 41 OPERATION PRINCIPLE 41 ICEMAKER FUNCTIONS 42 DEFECT DIAGNOSIS FUNCTION 43 CIRCUIT 44 TROUBLE DIAGNOSIS 45 TROUBLE SHOOTING 45 FAULTS 55 COOLING CYCLE HEAVY REPAIR 72 HOW TO DEAL WITH CLAIMS 79 HOW TO DISASSEMBLE AND ASSEMBLE 84 DOOR 84 HANDLE 85 SHROUD GRILLE FAN 85 WATER VALVE DISASSEMBLY...

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: ...e CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 10G 310 cc CAPILLARY TUBE ID 0 83 DRIER MOLECULAR SIEVE XH 7 1753 602 948 894 662 711 790 1135 5 Front View Plane View 1 Ref No GR P227 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 FREEZI...

Page 5: ...Tube Type CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 10G 310 cc CAPILLARY TUBE ID 0 83 602 948 894 662 711 790 1135 5 1753 Front View Plane View 2 Ref No GR L227 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 HEATE...

Page 6: ...e CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 10G 310 cc CAPILLARY TUBE ID 0 83 DRIER MOLECULAR SIEVE XH 7 1753 Front View Plane View 1 Ref No GR P257 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...

Page 7: ...Tube Type CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 10G 310 cc CAPILLARY TUBE ID 0 83 1753 Front View Plane View 2 Ref No GR L257 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 40...

Page 8: ... Refreshment center Optional Can Server Optional Shelf Folding or Normal Wine holder Plastic or wire Egg Box Vegetable Drawer Humidity Switch Door Rack Door Rack Miracle Zone Optional Fresh compartment Optional Conversion switch Meats Vegetables Optional Cover PWB Water Tube Home Bar Frame Display Dispenser Lamp Ice Water Dispenser Button 1 Ref No GR P227 GR P257 INTERNAL FILTER ...

Page 9: ...rack Lower cover Milk product corner Lamp Shelf Refreshment center Optional Can Server Optional Shelf Folding or Normal Wine holder Plastic or wire Egg Box Vegetable Drawer Humidity Switch Door Rack Door Rack Miracle Zone Optional Fresh compartment Optional Conversion switch Meats Vegetables Optional Cover PWB Home Bar Frame Display Dispenser Lamp Ice Water Dispenser Button ...

Page 10: ...Shelf Refreshment center Optional Can Server Optional Shelf Folding or Normal Wine holder Plastic or wire Egg Box Vegetable Drawer Humidity Switch Door Rack Door Rack Miracle Zone Optional Fresh compartment Optional Conversion switch Meats Vegetables Optional Cover PWB Water Tube Frame Display Dispenser Lamp Ice Water Dispenser Button 3 Ref No GR P227 GR P257 INTERNAL FILTER ...

Page 11: ...oor rack Lower cover Milk product corner Lamp Shelf Refreshment center Optional Can Server Optional Shelf Folding or Normal Wine holder Plastic or wire Egg Box Vegetable Drawer Humidity Switch Door Rack Door Rack Miracle Zone Optional Fresh compartment Optional Conversion switch Meats Vegetables Optional Frame Display Dispenser Lamp Ice Water Dispenser Button Cover PWB ...

Page 12: ...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 10 Adjusting Screw...

Page 13: ...firm the following installation parts HOW TO INSTALL REFRIGERATOR 11 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 14: ...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 12 Single ...

Page 15: ...ure drops Use standard feed tube to prevent leaking Outternal Filter 1 Filter Fixation 1 There are two types of filter One is nut type and the other is connector type 2 Connect feed tube to the filter outlet and water valve connecting tube 3 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 sha...

Page 16: ...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 and the top shelf of the ref...

Page 17: ...ops when the ice bin is full 3 If you don t want to use the automatic icemaker turn the icemaker switch to OFF If you want to use automatic icemaker again change the switch to ON 4 The water amount will vary depending on the water amount selection button Setting as well as the water pressure of the connected water line NOTE It is normal that a noise is produced when ice drops into the ice storage ...

Page 18: ...taneously to turn all LEDs ON and then OFF with the recognition sound of Ding after 5 seconds Be sure not to press only one button to work 16 Dispenser Selection Button Expres Freezer Selection Button Door Alarm Button Lock Button Dispenser Light On Off Button Filter Status Display RESET Button Temperature Adjust Button For Refrigerator Compartment Temperature Adjust Button For Freezer Compartment...

Page 19: ...d EXPRESS FRZ buttons simultaneously for 5 seconds until the Ding sounds again The refrigerator will default to the NORMAL mode DEMO mode OFF if the power fails 2 Description of Function 2 1 1 Funnction of Temperature Selection The temperature can vary 3 C depending on the load condition Whenever pressing button setting is repeated in the order of Medium Medium Max Max Min Medium Min The actual in...

Page 20: ...sensor fails it is displayed as Er 3 Since display temperature of outside temperature is temperature sensed by the ambient sensor in the hinge U of the freezing room it may differ from the outside temperature display of other household electrical appliances 2 1 4 Lock function display button lock 1 In power application of refrigerator the LOCK text is turned off at the right side of lock graphic o...

Page 21: ...maker does not operate smoothly Ice is lumped together When ice is lumped together take the ice lumps out of the ice bin break them into small pieces and then place them into the ice 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...

Page 22: ... 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 opening doors of the R room and it turns off if closing doors of R room 2 Temperature of the miracle zone is controlled with a stemping damper at the left side of the m...

Page 23: ... 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 24: ...tion 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 DU...

Page 25: ... MICOM returns to the original state Reset 4 Failure code is displayed on the display part of setting temperature for the freezing room and the display part of setting temperature for the cold storage room of LCD which are placed at the display part of a refrigerator All the LCD graphics other than a failure code are turned off All LCDs turn off other than freezer room notch temperature display an...

Page 26: ...Normal Status Mode Operation Contents Remarks Press test button once strong cold mode Press test button once at the test mode 1 status forced defrost mode Press test button once at the test mode 2 status 1 Continuous operation of compressor 2 Continuous operation of freezing bldc motor high speed RPM and cooling bldc motor 3 Defrost heater turns off 4 Stepping motor damper is completely opened ope...

Page 27: ... door is stop 5 seconds after Off to prevent short circuit of a coil due to overheat of solenoid 5 Dispenser 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...

Page 28: ...voltage a transformer and a feedback circuit IC3 and IC4 Caution Since high voltage 310 Vdc is maintained at the power terminal wait at least 3 minutes after unplugging the appliance to check the voltages to allow the current to dissipate Voltage of every part is as follows 1 GR P227 L227 Part VA1 CE1 CE2 CE3 CE4 CE5 Voltage 230 Vac 310 Vdc 16 Vdc 12 Vdc 16 Vdc 5 Vdc EXPLATION FOR MICOM CIRCUIT 26...

Page 29: ...fect the time calculations of the MICOM and it might not work at all 1 GR P227 L227 P257 L257 1 3 Reset circuit The RESET circuit allows various parts of the MICOM such as RAM defrosting etc to be restarted from the initial state when power is interrupted or restored A LOW signal applied to the reset terminal for 10 ms causes the MICOM to reset itself During normal operation the voltage at the res...

Page 30: ...r or refrigerator are connected to the door open sensing circuit in parallel toward both ends of switch to determine door open at MICOM In the TEST mode the fan will stop if any door is opened It will resume operation when the door is closed 1 GR P227 L227 P257 L257 EXPLATION FOR MICOM CIRCUIT 28 Measuring part IC6 IC6 16 IC6 13 IC6 12 IC6 15 IC6 14 Status ON Within 1 V OFF 12 V Type of Load Compr...

Page 31: ...ver Switch sensing circuit EXPLATION FOR MICOM CIRCUIT 29 Measuring part Lever S W IC1 Micom No 16 On OFF 5V 0 V 60 Hz 5 V Measuring part IC7 15 IC7 14 IC7 13 IC7 12 IC7 11 Status ON Within 1 V OFF 12 V Type of Load GEARED MOTOR SOLENOID CUBE PILOT VALVE WATER VALVE WATER SOLENOID DISPENSER ...

Page 32: ...ils the other will not respond properly If either switch fails the light will not come on EXPLATION FOR MICOM CIRCUIT 30 Closing 5 V A B C D Switch at both ends are at Off status Opening 0 V A B C D Switch at both ends are at On status Measuring part IC1 MICOM No 44 45 45 46 47 48 Pin Door of Freezer and Refrigerator ...

Page 33: ...frost sensor determines both the need for defrosting and the efficiency of the defrost operation See the table below for voltages and checkpoints EXPLATION FOR MICOM CIRCUIT 31 SENSOR CHECK POINT NORMAL 22 F 122 F IN SHORT IN OPEN Freezing sensor POINT A Voltage Defrost sensor POINT B Voltage Refrigerator sensor 1 POINT C Voltage 0 5 V 4 5 V 0 V 5 V Refrigerator sensor 2 POINT D Voltage Magic room...

Page 34: ...ion designation circuit model separation function 1 GR P227 L227 P257 L257 The circuits shown above vary according to which features are included on your particular model uThese circuits are preset at the factory and cannot be altered EXPLATION FOR MICOM CIRCUIT 32 Separation Connection Status Application Standard Connection Miracle Zone exist OP1 OUT Miracle Zone don t exist ...

Page 35: ...motor is driven by sending signals of 3 33 mSEC via MICOM pins 33 34 and 35 as shown in the chart below These signals are output via terminals 10 11 14 and 15 via input terminals 3 6 and 8 of IC10 TA7774F the motor drive chip The output signals allow the coils wound on each phase of the stator to form a magnetic field which causes rotation Input to the terminals INA and INB of IC10 as shown in the...

Page 36: ...cuit changes the speed of the fan motor by varying the DC voltage between 7 5 Vdc and 16 Vdc 3 This circuit stops the fan motor by cutting off power to the fan when it senses a lock up condition 1 GR P227 L227 P257 L257 EXPLATION FOR MICOM CIRCUIT 34 a d part b part e part Motor OFF 5V 2V or less 2V or less Motor ON 2 3V 12 14V 8 16V b a d e ...

Page 37: ... Temperature compensation at refrigerator Temperature compensation at freezer Freezer Refrigerator Resistance value Temperature Resistance value Temperature Remarks RCF1 compensation RCR1 compensation 180 kΩ 5 C 9 F 180 kΩ 2 5 C 4 5 F Warmer 56 kΩ 4 C 7 2 F 56 kΩ 2 0 C 3 6 F 33 kΩ 3 C 5 4 F 33 kΩ 1 5 C 2 7 F 18 kΩ 2 C 3 6 F 18 kΩ 1 0 C 1 8 F 12 kΩ 1 C 1 8 F 12 kΩ 0 5 C 0 9 F 10 kΩ 0 C 0 F 10 kΩ 0 ...

Page 38: ...wn 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 8 2 kΩ 3 6 F 2 7 F 1 8 F 0 9 F 0 9 F 1 8 F 2 7 F 3 6 F 4 5 F 5 4 F Refrigerator Down Down Down Drop change Up Up Up Up Up Up RCR1 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 10 kΩ 4 5 F 3 6 F 2 7 F 1 8 F 0 9 F 0 9 F 1 8 F 2 7 F 3 6 F 4 5 F Down Down Down Down Down change Up Up Up Up Up 3 C 2 5 C 2 C 1 5 C ...

Page 39: ...warm for too cold Temperature compensation value Remarks JCR3 JCR4 JCR1 JCR2 at refrigerator 0 C In shipment from factory CUT 1 C 1 8 F CUT 1 C 1 8 F CUT 1 C 1 8 F CUT 1 C 1 8 F CUT CUT 2 C 3 6 F CUT CUT 2 C 3 6 F CUT CUT 0 C 0 F CUT CUT 0 C 0 F CUT CUT 0 C 0 F CUT CUT 0 C 0 F CUT CUT CUT 1 C 1 8 F CUT CUT CUT 1 C 1 8 F CUT CUT CUT CUT 0 C 0 F Temperature compensation in CUT JCR1 1 C 1 8 F 2 C 3 6...

Page 40: ... assembly between the two boards is required for the display to function properly Poor communication occurs if a continuous information exchange fail to continue for more than 2 minutes between main MICOM of main PCB and LCD LED dedicated MICOM for LCD LED control of display PCB 1 GR P227 L227 P257 L257 EXPLATION FOR MICOM CIRCUIT 38 Main MICOM LCD LED dedicated MICOM DC 12V GND Transmission error...

Page 41: ...sensor 1 and 2 shall 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 39 Measuring Temperature C Freezing Sensor Refrigerator sensor 1 2 Defrost sensor Ambient sensor 20 C 22 3 kΩ 77 kΩ 15 C ...

Page 42: ...cle 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 40 EXPLATION FOR MICOM CIRCUIT ...

Page 43: ...n Fill Test Mode Waits until water becomes ice after starting the icemaking operation Runs MOTOR to drop ice from the tray into the ICE BIN During harvest mode check if the ice bin is full Performs Ice Making Mode after supplying water by operating the SOLENOID in ICE VALVE To operate LINE and SERVICE press and hold the Water amount selection button for 3 seconds The icemaker will run through 3 st...

Page 44: ...n for test for 6 sec 2 3 Harvest Mode 1 Harvest Ice removing refers to the operation of dropping ices into the ice bin from the tray when icemaking has completed 2 Harvest mode 1 The Heater is ON for 30 seconds then the motor starts 2 The feeler arm senses the quantity of ice in the ice bin while rotating with the EJECTOR A ice bin is full The EJECTOR stops heater off B ice bin is not full The EJE...

Page 45: ...are ices in the ice tray it can take more than 90 seconds Diagnosis TABLE 3 Defect diagnosis function 3 1 ERROR CODES shown on Icemaker water supply control panel ERROR indicators in table can be checked only in TEST mode ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 43 STAGE ITEMS INDICATOR REMARKS 1 2 3 4 5 6 HEATER MOTOR HALL IC I detection of position HALL IC II detection of position VA...

Page 46: ... 1 GR P227 L227 P257 L257GR P227 L227 P257 L257 CIRCUIT 44 ...

Page 47: ... 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 intern...

Page 48: ...itintheair 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 During rest time Afterwork ...

Page 49: ...reignmaterials penetration Cap drain is not disconnected Injectthroughthe hole Seal with drain P U lump input Screw input Otherforeignmaterials input Parts disconnected Wire is cut Leadwire Heatingwire Contactpoint betweenheatingand electricwire Dent by fin evaporator Heatingwireiscorroded Waterpenetration Badterminalconnection Check visually Check terminal Conduction OK No conduction NG If wire i...

Page 50: ...tion thickness Structural fault Gasket gap Airinflowthroughthefanmotor Bad insulation of case door SheathHeater rated Heaterplate rated Gap Badattachment Contraction Badadhesion Weakbindingforceathinge Fanmotor Door switch Self locked Wire is cut Badterminalcontact Contact distance Buttonpressure Meltedcontact Contact Poordoor attachment Door liner dimension Contraction inner liner Misalignment Ba...

Page 51: ...constrained Insufficient motorRPM Faultyfan Shorud Bent Iceandforeignmaterialsonrotatingparts Fanshroudcontact Clearance Dampingevaporatorcontact Accumulatedresidualfrost Fanmisuse Bad shape Looseconnection Nottightlyconnected Insertdepth Ratingmisuse Smallcapacity Lowvaltage Malfunction of charging cylinder Wrongsettingofrefrigerant Insufficient compressor Faulty compressor Fanoverload Fanmisuse ...

Page 52: ... 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 Differentrating...

Page 53: ...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 54: ...fault Coregap Bad connection Correct screw connection Bad assembly Distortion Foreignmaterialsinside Badconnection Partlydamaged Not connected Badpipecaulking Normaloperatingsound Vibrationsound Agedrubberseat Badtorqueforassemblingmotor bracket Fanguidecontact Shroudburrcontact Dampingevaporatorcontact Residualfrostcontact Unbalance Iceonthefan Airintake oppositetomotor rubberassembly Supporterdi...

Page 55: ...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 56: ...weendoorlinerandinnerliner Refrigerator compartmentis openedwhenfreezer compartmentis closed faultystopper High Faultydampercontrol Buttonissetat weak Doorisopen interferenceby food No deodorizer Poor capacity Seal condition Store special odorous food Longtermstorage Odorsfromchemicalprocucts Biggerdoorfoam Hinge Pintilted Poorflatness Nowasher Nogreaseandnotenough quantity Stopperwornout Badfreez...

Page 57: ... 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 58: ...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 59: ... 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 60: ...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 61: ...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 62: ...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 63: ...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 64: ...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 65: ... 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 66: ...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 67: ...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 68: ...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 69: ...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 70: ...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 71: ...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 72: ...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 tes...

Page 73: ...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 74: ...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 75: ...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 76: ... 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 77: ...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 78: ...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 79: ...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 80: ...azer 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 Asia...

Page 81: ... 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 82: ... 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 pres...

Page 83: ...stics 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 o...

Page 84: ...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 85: ...iner 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 86: ...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 87: ...g a cap screw of a grille fan U with a balde screwdriver 2 Disassembly of a grille fan U Pull forward after opening hook at part with a blade screwdriver 3 Disconnect housing A of a grille fan L from the main body 4 Disassembly of a grille fan L Hold upper part of a grille fan L and pull forward carefully 5 Loosen two screws 6 Disassembly of shroud F U Disconnect housing of B after removing two ra...

Page 88: ...over and Valve Screw 5 Separate the housing and pull out the valve 5 FAN AND FAN MOTOR DISASSEMBLY METHOD 1 Using a short screwdriver loosen one SCREW in DRAIN PIPE ASSEMBLY and one connected to the MOTOR COVER 2 Pull and separate the FAN ASSEMBLY and MOTOR turning counterclockwise based on the MOTOR SHAFT The assembly is in the reverse order of the disassembly and take special care for the follow...

Page 89: ...g the display frame from its housing 4 Loosen four screws with a phillips screwdriver and pull the funnel assembly to disconnect 5 The duct cap assembly can be disconnected if the hold lever connecting screw is loosened with a phillips driver 6 To install the duct cap assembly insert one end of the spring into the right hole of the dispenser lever and insert the other end into the right hole in th...

Page 90: ...ISPENSER 3 DECO FRAME DISPLAY 4 PWB PCB ASSEMBLY DISPLAY 7 FUNNEL ASSEMBLY 8 MICRO SWITCH 9 FRAME FUNNEL 10 LEVER SWITCH 11 FUNNEL 12 BUTTON LEVER 13 HOLLDER BUTTON 14 SOLENOID ASSEMBLY 15 SPRING 16 LEVER HOLDER 17 CAP ASSEMBLY DUCT 18 CAP DUCT 19 DISPENSER LEVER 20 FOAM NEW 21 RUBBER CAP 22 DECO DRAIN NOTE Not every model includes every option ...

Page 91: ...FREEZER DOOR PART GR P227 L227 P257 L257 EXPLODED VIEW 89 210B 210B 210B 202A 200A 201A 203A 611B 600A 606A 612A 614A 610A EV 205A ...

Page 92: ...Ref No GR P227 GR P257 REFRIGERATOR DOOR PART Optional part EXPLODED VIEW 90 240B 232A 264C 264A 264B 240A 233A 230A 231A 212G 243A 241B 241C 241A 243A 617A 250A 260A 240E 240D 240C EV 205A ...

Page 93: ...Ref No GR L227 GR L257 REFRIGERATOR DOOR PART Optional part EXPLODED VIEW 91 240A 232A 240A 233A 230A 239A 243A 241B 241C 241A 205F 205B 205E 205A 205C 205D 243A 240E 240D 240C 231A EV ...

Page 94: ...al part EXPLODED VIEW 92 408A 302B 400A 270A 271B 271A 103A 312A 402A 152A 128E 128F 105B 272A 623B 621B 621A 135B 128C 128D 128C 128D 137B 136D 136A 135A 136B 403A 136C 401A 137A 130A 125A 126A 120C 120B 120B 120D 125A 101B EV ...

Page 95: ...0E 504A 165A 165A 166C 166A 166B 624A 624A 624A 270B 625A 271B 271C 103A 116A 272B 151A 626B 626A 626C 101A 151B 151C 150A 624C 401A 146A 402A 152A 162A 162B 177A 177B 115A 149E 140A 140A 165A 165A 166C 166A 166B 140A EXPLODED VIEW 93 EV 150B 115C 115B 142A 142B 142C 142D ...

Page 96: ...PARTMENT Optional part EXPLODED VIEW 94 300A 310B 307A 304A 306A 310A 317B 317A 313A 301A 307A 104A 303C 303B 303A 410G 410H 500A 502B 502A 308A 308C 308B 309B 403B 309C 309A 305C 305B 305C 305B 305A 406A 316A EV ...

Page 97: ...ICE WATER PART Optional part EXPLODED VIEW 98 404A 620A 620B 625A 616G 619A 616F 627A 624B 619A 404B 621B 601A 605A 602A 607A 600A 603A 603B 604A ...

Page 98: ...DISPENSER PART Optional part EXPLODED VIEW 95 278A 402C 405A 275A 276A 278B 278C 276B 279A 279B 281A 280C 280B 280A 501A 278D EV ...

Page 99: ...P No 3828JD8999A FEB 2006 Printed in Korea ...

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LG GC-L227, Service Manual

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