LG LRSC26920TT Service Manual Download Page 24

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1. Explanation for PWB circuit

1-1. Power circuit

1. GR-L267****
The power circuit includes a Switched Mode Power Supply (SMPS). It consists of a rectifier (BD1 and CE1) converting AC
to DC, a switch (IC2) switching the DC voltage, a transformer, and a feedback circuit (IC3 and IC4).

Caution : Since high voltage (160 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:

EXPLANATION FOR MICOM CIRCUIT

- 30 -

Part

VA1

CE1

CE2

CE3

CE4

CE5

Voltage

120 Vac

160 Vdc

14 Vdc

12 Vdc

15.5 Vdc

5 Vdc

Summary of Contents for LRSC26920TT

Page 1: ...CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL BEFORE CHECKING OR OPERATING THE REFRIGERATOR REFRIGERATOR SERVICE MANUAL LRSC26920TT http biz lgservice com ...

Page 2: ...PARTS DIAGRAM AND LIST 46 PWB CIRCUIT DIAGRAM 52 OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER 54 OPERATION PRINCIPLE 54 CONTROL METHOD ACCORDING TO FUNCTIONS 55 DEFECT DIAGNOSIS FUNCTION 57 CIRCUIT 58 TROUBLE DIAGNOSIS 61 TROUBLESHOOTING 61 FAULTS 71 COOLING CYCLE HEAVY REPAIR 88 HOW TO DEAL WITH CLAIMS 95 HOW TO DISASSEMBLE AND ASSEMBLE 100 DOOR 100 HANDLE 101 FAN SHROUD GRILLE 102 ICEMAKER ...

Page 3: ...gaged Remove dust and foreign materials from the housing and connecting parts 8 Do not fray damage run over kink bend pull out or twist the power cord 9 Please check for evidence of moisture intrusion in the electrical components Replace the parts or mask with insulation tape if moisture intrusion was confirmed 10 Do not touch the icemaker with hands or tools to confirm the operation of geared mot...

Page 4: ...L 10G 320 cc ITEMS SPECIFICATIONS DRIER MOLECULAR SIEVE XH 7 CAPILLARY TUBE ID Ø0 85 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 Water Tank Heater Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 4 EA DISPENSER LAMP 15W 1 EA 724 mm 28 1 2 in 1004 mm 391 2 in 908 mm 3911...

Page 5: ...or Rack Shelf Door Rack Wine Holder Lamp Lower Cover Dairy Product Corner Door Rack Drawer Wire Plastic Freezer Compartment Refrigerator Compartment Automatic Icemaker Door Rack Shelf Bottle Guide Frame Display Dispenser Lamp Ice Water Dispenser Button PWB Cover Water Tubes Door Rack Water Filter 3 Ref No GR L267AV T RA ...

Page 6: ...f the freezer door is higher than the refrigerator door Insert a driver into the groove if the adjusting screw and turn in the direction of the arrow clockwise until the refrigerator is level Insert a driver into the groove if the adjusting screw and turn in the direction of the arrow clockwise until the refrigerator is level HOW TO INSTALL REFRIGERATOR 12 Adjusting Screw Driver Height Difference ...

Page 7: ...tective cover from the o rings With cartridge knob in the vertical position push the new filter cartridge into the cover until it stops If you can t turn the filter from side to side it isn t fully inserted Push it in firmly and twist it into place You will hear the snap when it clicks into place Using the handle twist the cartridge clockwise about 1 4 turn 3 Flush the Water System After Replacing...

Page 8: ...t put hands or tools into the chute to confirm the operation of geared motor It may damage the refrigerator or hurt your hands Water supply amount TABLE HOW TO INSTALL REFRIGERATOR 14 2 1 STAGE TIME TO SUPPLY INDICATIONS REMARKS 1 2 3 4 5 4 sec 4 5 sec 5 sec 5 5 sec 6 sec The water amount will vary depending on the Water Control Switch setting as well as the water pressure of the connected water l...

Page 9: ...he cube size is smaller or larger than you expected you can regulate the size with the cube size button nomally caused by variations in water pressure Every time you press the cube size button the indicator light go up The higher position light is on the larger cubes will be 1st step is the next after the 5th step 3 3 When you should set the icemaker power switch to O off When the water supply wil...

Page 10: ...nser Lamp On Off button Filter status display RESET button Temperature adjustment button for refrigerator compartment Temperature adjustment button for freezer compartment EXPRESS DIGITAL CONTROL FRZ TEMP REF TEMP JET CUBE FILTER RESET HOLD 3SECS EXPRESS JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER RESET LIGHT LOOK ROOM TEMP LOCK DISPENSER KEY WATER CRUSH 3 SECS F C F C F C FILTER ON DIGITAL CONT...

Page 11: ...f pressing the special freezing button and the freezing temperature adjustment button for more than a second the back light is turned on and all the graphics of LCD are turned on If releasing the button the LCD graphic is displayed in the previous status and the back light is turned off check LCD graphic and back light ON OFF status 2 1 3 Outside temperature display function 1 Outside temperature ...

Page 12: ...o reset the indicator press and hold the Filter Light button for more than 3 seconds 2 LED GR L267AV T BA other Model 1 There is a replacement indicator light for the water filter cartridge on the dispenser 2 The water filter should be replaced every six months or about 28 000 seconds filtering time 3 The water filter light and FILTER RESET HOLD 3 SECS will show in the display to remind you to cha...

Page 13: ...rk graphic remains at the On status after flickering 4 times when selecting Special Refrigeration EXPRESS FRZ or JET FRZ EXPRESS FREEZE and JET FREEZE operate for a set time and then default to normal freezer operation 2 4 Dispenser Light Dispenser switch or dispenser light button turn the dispenser light in the dispenser on and off The dispenser light Function is repeated following below whenever...

Page 14: ... of the compressor s last run cycle the EXPRESS FREEZING cycle will not begin until the 7 minute delay is complete 10 The freezer fan runs at high speed when Express Freezing is selected 2 6 Jet Freezing 1 Jet Freezing improves the cooling speed of the Jet Freezing Compartment by running the compressor and the Jet Freezing Compartment fan 2 If there is a power failure the Jet Freezing cycle is rel...

Page 15: ... selected the selected temperature and NOTCH LED are not shown and the temperature can be adjusted 5 The Optichill sensor detects the temperature and relays this information to the MICOM Based on the temperature and setting The damper is opened or closed and the heater is on or off as the conditions warrant 6 If the Optichill damper hasn t moved within an hour it is automatically opened or closed ...

Page 16: ...leased the Optichill automatically defaults to CHILLED ROOM 30 F u u GR L267AV T FA Model 2 7 3 Temperature control in OptiChill 1 The Optichill is in the bottom of the refrigerator compartment and allows the user to select and adjust the temperature based on the type food stored there Selections include meat fish fruits and vegetables etc Storing foods at the proper temperature allows them to be ...

Page 17: ...2 9 Control of cooling fan motor 1 The cooling fan is switched ON and OFF in conjunction with the compressor 2 The cooling fan runs at a single speed 3 Failure sensing method is same as in fan motor of freezing fan motor refer to failure diagnosis function table for failure display 2 10 Door opening alarm 1 Buzzer generates alarm sound if doors are not closed even when more than a minute consecuti...

Page 18: ... when the total compressor runtime is 41 2 hours 3 Defrost is completed when the defrost sensor temperature rises above 41 F 5 C during the defrost cycle The defrost cycle will terminate if the defrost sensor temperature does not achieve 41 F 5 C within two hours 4 The defrost cycle will not operate if the defrost sensor fails 2 14 Refrigerator compartment lamp automatically off The refrigerator l...

Page 19: ...frost sensor surpasses 41 F 5 C The compressor will run after the 7 minute delay When temperature of a defrost sensor becomes less than 45 C In power failure service Test mode 1 Compulsory function Test mode 2 Compulsory defrost POWER ON COMP ON F FAN C FAN ON R STEP MOTOR DAMPER ON OPTICHILL STEP DAMPER MOTOR ON DEFROST HEATER OFF DEFROST HEATER ON DAMPER DUCTDOOR OPTICHILL HEATERON DAMPER DUCTDO...

Page 20: ... Note 1 Normal display Note 2 Failurecodeindicationpart Freezernotch temperature display Refrigeratornotch temperature display No Item Contents of 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 ...

Page 21: ...eously R2 sensor middle room Normal LED or LCD graphic on the C part turns on Abnormal LED or LCD graphic on the C part turns off Optichill sensor Normal LED or LCD graphic on the D part turns on Abnormal LED or LCD graphic on the D part turns off Water tank sensor Normal LEDs or LCDs graphic on the E part turns on Abnormal LEDs or LCDs graphic on the E part turns off LCD LED check function LCD LE...

Page 22: ...e 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 baffle open 5 Optichill stepping motor damper is completely closed 6 All display LEDs or LCD graphics turn on 1 Compressor OFF 2 Freezing BLDC motor and cooling BLDC motor turn of...

Page 23: ...signal This prevents damage and overheating of the motor The duct door will close 5 seconds after ice is dispensed 5 The dispenser lamp is turned on and off by the dispenser switch 6 Selection of Cubes Crushed Water 1 Select Cubes Crushed Water using the selection button 2 The default at power up is Cubes 3 The geared motor operates when Cubes or Crushed is selected 7 Water Dispenser Function 1 Se...

Page 24: ...ng the DC voltage a transformer and a feedback circuit IC3 and IC4 Caution Since high voltage 160 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 EXPLANATION FOR MICOM CIRCUIT 30 Part VA1 CE1 CE2 CE3 CE4 CE5 Voltage 120 Vac 160 Vdc 14 Vdc 12 Vdc 15 5 Vdc 5 Vdc ...

Page 25: ...e time calculations of the MICOM will be affected and it might not work at all 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 reset terminal is ...

Page 26: ...ator 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 L267 EXPLANATION FOR MICOM CIRCUIT 32 REF REF Measuring part IC6 IC6 14 IC6 10 IC7 16 IC6 13 IC6 11 IC6 12 Status ON Within 1 V OFF 12 V Type of Load Compressor Frost...

Page 27: ...ch sensing circuit EXPLANATION FOR MICOM CIRCUIT 33 Measuring part Lever S W IC1 Micom No 16 On Press OFF 5V 0 V 60 Hz 5 V Measuring part IC7 15 IC7 14 IC7 13 IC7 12 Status ON Within 1 V OFF 12 V Type of Load GEARED MOTOR SOLENOID CUBE WATER VALVE WATER SOLENOID DISPENSER ...

Page 28: ...ls the other will not respond properly If either switch fails the light will not come on EXPLANATION FOR MICOM CIRCUIT 34 Closing 5 V A B C D Switch at both ends are at Off status Opening 5 V A B C D Switch at both ends are at On status Measuring part IC1 MICOM No 47 46 Pin Door of Freezer Refrigerator ...

Page 29: ...tion See the table below for voltages and checkpoints EXPLANATION FOR MICOM CIRCUIT 35 SENSOR CHECK POINT NORMAL 30 C 50 C IN SHORT IN OPEN Freezing sensor POINT A Voltage Defrost sensor POINT B Voltage Refrigerator sensor 1 POINT C Voltage Refrigerator sensor 2 POINT D Voltage 0 5 V 4 5 V 0 V 5 V Room temperature sensor POINT E Voltage Water tank sensor POINT F Voltage Optichill sensor POINT G Vo...

Page 30: ...e 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 NOTE The chart makes absolutely no sense You have Optichill no matter which way the connection is set EXPLANATION FOR MICOM CIRCUIT 36 P34 37 R25 CC10 223 R24 48 P47 P46 47 Separation Connection Status Application Standard Connection OptiChil...

Page 31: ... 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 chart below drives the mo...

Page 32: ...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 L267 EXPLANATION FOR MICOM CIRCUIT 38 a d part b part e part c f part Motor OFF 5V 2V or less 2V or less 0 V Motor ON 2 3V 12 14V 8 16V 0 V COMPRESSOR FAN PWM COMPRESSOR FAN LOCK FREEZER FAN PWM FREEZER FAN LOCK ...

Page 33: ...R MICOM CIRCUIT 39 Temperature compensation at refrigerator Temperature compensation at freezer R16 R17 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 ...

Page 34: ...own 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 35: ... weak cold for over 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 ...

Page 36: ...r 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 L267 EXPLANATION FOR MICOM CIRCUIT 42 ICEBEAM COOLING OFF CUBE FILTER MONTH EXPRESS JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER LIGHT LOOK ROOM TEMP DISPENSER KEY F WATER 5 4 3 2 1 CRUSH F F 3 SECS ...

Page 37: ...or 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 EXPLANATION FOR MICOM CIRCUIT 43 Measuring Temperature C Freezing Sensor Cold storage sensor 1 2 Frost removal sensor Outside sensor 20 C 22 3 kΩ 77 kΩ 1...

Page 38: ...67AV T BA GR L267AV T FA MODEL 1 13 Jet freezing 1 GR L267AV T BA GR L267AV T FA MODEL EXPLANATION FOR MICOM CIRCUIT 44 DAMPER HEATER OPTICHILL OPTICHILL STEPPING MOTOR OPTICHILL SENSOR P W B A S S E M B L Y D I S P L A Y JET FREEZER BOX FAN MOTOR ...

Page 39: ...2 PWB parts diagram and list 2 1 PWB Assembly main part diagram 1 GR L267 EXPLANATION FOR MICOM CIRCUIT 45 ...

Page 40: ...2 2 Parts list 1 GR L267 EXPLANATION FOR MICOM CIRCUIT 46 ...

Page 41: ...EXPLANATION FOR MICOM CIRCUIT 47 ...

Page 42: ...2 3 GR L267AV T BA 1 DISPLAY ASSEMBLY part diagram EXPLANATION FOR MICOM CIRCUIT 48 ...

Page 43: ...2 DISPLAY circuit diagram EXPLANATION FOR MICOM CIRCUIT 49 ...

Page 44: ...2 4 GR L267AV T FA GR L267AV T RA GR L267D A TR 1 DISPLAY ASSEMBLY part diagram EXPLANATION FOR MICOM CIRCUIT 50 ...

Page 45: ...2 DISPLAY circuit diagram EXPLANATION FOR MICOM CIRCUIT 51 P W B A S S E M B L Y D I S P L A Y ...

Page 46: ...3 PWB Circuit Diagram may vary according to model 1 GR L267 EXPLANATION FOR MICOM CIRCUIT 52 REF REF ...

Page 47: ...ENSOR DEFROST SENSOR FRZ DOOR SWITCH JET FREEZER BOX FAN MOTOR P C B A S S E M B L Y D I S P L A Y P C B A S S E M B L Y D I S P L A Y REF DOOR SWITCH REF UPPER SENSOR REF LOWER SENSOR DAMPER HEATER OPTICHILL OPTICHILL STEPPING MOTOR OPTICHILL BOX FAN MOTOR OPTICHILL SENSOR ...

Page 48: ...sition with power on Power On Start Position Icemaking Mode Dump Mode Park Position Fill Test Mode Waits until water becomes cold after starting the ice making operation Runs MOTOR to drop ice from the tray to the ICE BIN Performs Icemaking Mode after supplying water by operating the SOLENOID in ICE VALVE To operate LINE and SERVICE press and hold the water supply control switch for 3 seconds The ...

Page 49: ... sensor is defective the Icemaking function will be completed in 4 hours 2 3 Harvest with Dump Mode 1 Harvest with Dump control refers to the operation of dropping cubes into the ice bin from the tray when Icemaking has completed 2 Harvest with Dump control mode 1 Operates Heater for 30 seconds then operate MOTOR 2 After performing Step 1 to control the Heater on its off condition Ice Removal cont...

Page 50: ...s water to the ice making tray 2 The water supply level is adjustable to 5 levels by pressing the water supply control switch The selected level will determine the fill time Water supply amount TABLE OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER 56 STAGE TIME TO SUPPLY INDICATIONS REMARKS 1 2 3 4 5 4 sec 4 5 sec 5 sec 5 5 sec 6 sec The water amount will vary depending on the water control Swit...

Page 51: ... in table can be checked only in TEST mode OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER 57 STAGE ITEMS INDICATOR REMARKS 1 2 3 4 5 6 HEATER MOTOR HALL IC detection of position I VALVE Detection of ICE FULL HALL IC Detection of ICE FULL I I reset Five seconds after heater starts heater will go off if temperature recorded by sensor is 10 C or lever is in up position Five seconds after heater st...

Page 52: ... 58 GR L267 BA FREEZER FAN FREEZER SENSOR FREEZER COMPRESSOR FAN REF UPPER REF LOWER REF REF LAMP REF LAMP REF LAMP REF LAMP REF DOOR SWITCH DISPENSER LEVER SWITCH FREEZER LAMP FREEZER LAMP FREEZER DOOR SWITCH ...

Page 53: ...CIRCUIT 59 GR L267 FA FREEZER FREEZER FREEZER COMPRESSOR REF UPPER REF LOWER REF REF DOOR SWITCH ICEMAKER KIT FREEZER LAMP FREEZER DOOR SWITCH ...

Page 54: ...CIRCUIT 60 GR L267 R A FREEZER FREEZER FREEZER COMPRESSOR REF UPPER REF LOWER REF REF DISPENSER LEVER SWITCH FREEZER DOOR SWITCH FREEZER LAMP ...

Page 55: ...nal Bad connection between plug and adapter faulty plug The distance between pins Pin outer diameter No power on power cord OLP is off No electric power on compressor Faulty compressor Faulty PTC Disconnectedcopperwire Internalelectricalshort Faultyterminalcontact Disconnected Capacity of OLP is small CharacteristicsofOLPisbad Badconnection Poweris disconnected InnerNi Crwireblowsout Bad internal ...

Page 56: ...n Leaveitintheair 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 After...

Page 57: ...isconnected Injectthroughthe hole Seal with drain Adiabatics lump input Damage by a screw or clamp Otherforeignmaterialsinput Parts disconnected Wire is cut Heatingwire Contactpoint betweenheating andelectricwire Dentbyfinevaporator Poorterminalcontacts Wire is cut Leadwire Heatingwire Contactpoint betweenheatingand electricwire Heatingwireiscorroded Waterpenetration Badterminalconnection Check vi...

Page 58: ...ghthefanmotor Badinsulationofcasedoor SheathHeater rated Heaterplate Heatercord L Gap Badattachment Contraction Badadhesion Weakbindingforceathinge Fanmotor Door switch Selflocked Wireiscut Badterminalcontact Contact distance Buttonpressure Meltedcontact Contact Poordoor attachment Door liner dimension Contractioninner liner Misalignment Badterminal connection Adiabatics liquid leak Faults Refrige...

Page 59: ...an Shorud Bent Iceandforeignmaterialsonrotatingparts Fanshroudcontact Clearance Dampingevaporatorcontact Accumulatedresidualfrost Fanmisuse Badshape Looseconnection Nottightlyconnected Insertdepth Ratingmisuse Smallcapacity Lowvaltage Malfunction of charging cylinder Wrongsettingofrefrigerant Insufficientcompressor Faultycompressor Fanoverload Fanmisuse BadlowtermperatureRPMcharacteristics Ratedpo...

Page 60: ...ls Adiabatics dump liquid Faulty contact Faulty temperature characteristics External air inflow Bushing installed incorrectly 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 Differentrat...

Page 61: ...acity Position of drain 1 Compressor compartment operating sounds Compressor sound Sound from machine itself inserted Sound from vibration Restrainer Bushing 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 OLP sound Chatterin...

Page 62: ...ownfault 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 bushingassembly Supporte...

Page 63: ...lel distance Bad connection Bad terminal contact Adiabatics liquid leak 1 Lead wire is damaged Wire damage when assembling PTC 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 t...

Page 64: ...dinnerliner Refrigerator compartmentis openedwhenfreezer compartmentis closed faultystopper High Faultydampercontrol Buttonissetatweak Doorisopen interferenceby food No deodorizer Poorcapacity Seal condition Storageoffragrantfoods Longtermstorage Odorsfromcleanersoritemswhichshroudnot bestoredinarefrigerator Biggerdoorfoam Hinge Pintilted Poorflatness Nowasher Nogrease Stopperwornout Badfreezercom...

Page 65: ...rd and products Replace with rated fuse Electricity leakage Check the resistance of power cord If fuse blowns out High voltage with tester if it is 0Ω it is shorted frequently confirm 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 66: ...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 67: ... 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 68: ...eld If it is warm 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 warm and th...

Page 69: ...ut impurities by inserting 1 Impurities of ice insert the copper line copper wire Turn off more than 2 Ice through the hole to check 3 hours and pour in hot water if 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 suction duct manually and assemble the disconnected parts Gap between Suctio...

Page 70: ...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 71: ...ttachment 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 are fault...

Page 72: ...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 73: ...serting 5 Replace defective fan and fan conditions in pipes motor 2 3 Touch pipes with hands or screw 6 Adjust fan to be in the center of driver check the change of the fan guide sound 7 Leave a clearance between interfering parts and seal gaps in 3 Fan operation sound in the freezer 3 1 Check fan insertion depth and the structures compartment blade damage 8 Reassemble the parts which make 3 2 Che...

Page 74: ...on with bushing 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 75: ...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 76: ...nyl wraps with plastic wrap Clean the refrigerator and set Chedk food cleanliness 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 deodo...

Page 77: ...tric circuit parts 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...

Page 78: ...Refer to tables on pages 40 41 and 43 The wrong sensor Confirm the color of sensor in Repair main PCB explanation has been installed circuits main PCB sensor sensor housing Order by model number housing and part number 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 Ref...

Page 79: ...uit 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 80: ... circuit 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 w...

Page 81: ...ociated 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 Defecti...

Page 82: ...pplicable 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 bushing pipes for R12 refrigerant shall piping exclusive mixing of be melted when they are used for R134a manifold mineral and...

Page 83: ...while compressor operates electronic scales pinch off Weld carefully after pinching off the inlet pipe plier gas welding machine Check leak at weld joints Electronic Leak Detector Minute leak Use electronic leak detector Driver Ruler Big leak Check visually 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 war...

Page 84: ... TO KEEP THE OIL FROM BEING FORCED OUT The use of piercing type valves will allow future servicing and eliminates the possibility of a defective pinch off 3 Replacement of drier 1 Be sure to replace drier with R134a only when repairing pipes and injecting refrigerant 4 Nitrogen blowing 1 Use pressurized nitrogen to prevent oxidation inside the piping welding Nitrogen pressure 0 1 0 2 kg cm2 5 Othe...

Page 85: ... a drier When replacing a compressor Weld and parts by blowing nitrogen to the low pressure side Note For other parts nitrogen blowing 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 i...

Page 86: ...ster and measure the weight Calculate the weight of refrigerant charged into the charging canister by subtracting the weight of an evacuated charging canister KEY POINT If power is applied during vacuum degassing vacuum degassing shall be more effective Run the compressor while charging the system It is easier and works better KEY POINT Be sure to charge the refrigerant at around 25 C 77 F Be sure...

Page 87: ...f the mechanical area Compressor Condenser Drier Hot Line Evaporator Charging Canister Bushing 1 Observe the safety precautions for gas handling 2 Use JIG or a wet towel in order to prevent electric wires from burning during welding In order to prevent insulation break and accident 3 The inner case will melt and the insulation will burn 4 The copper piping will oxidize 5 Do not allow aluminum and ...

Page 88: ...SEMBLY JOINT PIPE ASSEMBLY HOT LINE Freezer PIPE ASSEMBLY JOINT CONDENSER ASSEMBLY WIRE PIPE ASSEMBLY SUCTION DRIER ASSEMBLY CAPI TUBE Copper Brazer Copper Brazer Silver Brazer Copper Brazer Copper Brazer Copper Brazer Coppper Brazer Silver Brazer Copper Brazer ...

Page 89: ...aporator 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 3600 RPM This sound is c...

Page 90: ...nd water flowing also makes sound When water Noise from motor sounds Hiss freezes clicking sounds are heard When ice is being ejected sounds like Hiss produced by a motor to rotate an ice tray and ice dropping and hitting ice bin 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 pressed the water ...

Page 91: ...ics of ice cream The freezing point of ice cream is below 15 C 5 F 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 92: ...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 2 2 F if temperature is set at MID If hot air comes into the refrigerator fine frost forms as cold ...

Page 93: ... frequently opened and wet foods are not stored in the air tight container or properly vegetable drawer wrapped Be sure to store wet foods in airtight containers or securely covered in plastic wrap When is the power connected When should the power be connected You can connect the power immediately after installation However if the refrigerator was laid flat before or during installation you must s...

Page 94: ... turn hinge lever counterclockwise If the hinge or bracket are bent during assembly use two extra screws Tap Tite M6 Left Hinge attaching screw in the holes of the upper hinge 3 Disconnect upper hinge from the 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 because the door may fall dama...

Page 95: ... direction of arrow 3 Push the handle piece in the direction of the arrow and disconnect it 4 Turn screw in arrow direction with a philips driver and disconnect 2 Plastic handle Model 1 Use a small screwdriver blade in the groove at the side of the Deco Handle to push it down slightly and separate the cover Push down in the direction of arrow and push the cover down in the direction of arrow 2 Tur...

Page 96: ...with a screwdriver blade 7 Disassembly of shroud F U Hold upper part and pull forward 8 Check foam sticking conditions around a shroud F U and F L during assembling If damaged torn or badly stuck assemble with a new one after sealing well 4 ICEMAKER ASSEMBLY 1 Dispenser Model 1 How to disassemble 1 Remove ice bin and shelf from the freezer compartment 2 Loosen four screws under part of icemaker 3 ...

Page 97: ...sing 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 the top part of the dispenser Then...

Page 98: ... 2 DISPENSER COVER 4 PWB PCB ASSEMBLY DISPLAY 7 FUNNEL ASSEMBLY 8 MICRO SWITCH 9 FUNNEL FRAME 10 LEVER SWITCH 11 FUNNEL 12 FUNNEL GUIDE 13 ROCKER SWITCH 14 SOLENOID ASSEMBLY 15 SPRING 16 LEVER HOLDER 17 DUCT CAP 19 DISPENSER LEVER 20 BUSHNIG CAP 21 BUTTON ASSEMBLY 22 BUTTON 23 BUTTON HOLDER 24 DRAIN GRILLE 17 Cap Assembly Duct Detailed Drawings ...

Page 99: ...FREEZER DOOR PART GR L267AV T A Optional part EXPLODED VIEW 105 202A 200A 210A 203A 201A 210B 210C 205F 205B 205E 205A 205C 205D 210B EV ...

Page 100: ...GERATOR DOOR PART GR L267AV T A Optional part EXPLODED VIEW 106 240A 232A 240C 233A 230A 239A 231A 241B 241C 241A 205F 205B 205E 205A 205C 205D 243A 242D 147A 147B 147C 242C 242A 242B 242D 242C 242A 242B EV ...

Page 101: ...tional part EXPLODED VIEW 107 271B 270C 271A 103A 312A 152A 128C 128D 128D 128F 128H 128C 128E 128G 403C 139B 105B 272A 135B 137A 136D 329A 135A 136B 403A 136C 401A 130A 126A 125A 121A 120C 403D 127B 120B 270A 402A 408A 302B 316B 400A EV ...

Page 102: ... 108 271B 271C 145A 145A 103A 152A 152A 177A 170A 166B 166A 165A 272B 155A 146A 146B 177B 166B 150B 409B 116A 401A 115A 150A 168A 120E 162A 162B 142D 142A 270D 402A 270B 151A 171B 171A 141C 141B 140A 140C 140B 142C 142B 624D 624B 624C 624A 504A 167A 167B 167C 141A EV ...

Page 103: ...ICE WATER PART GR L267AV T A Optional part EXPLODED VIEW 109 614A 613A 600B 606A 610A 621B 600A 612A 612B 612C 616E 618A 616D 404A 625A 616G 621C 616F 611B 611A 611C 611D 404B 627A 619A EV ...

Page 104: ...l part EXPLODED VIEW 110 300A 310B 307A 304A 306A 310A 317B 317A 313A 301A 307A 104A 303C 303B 303A 500A 502B 406A 101B 101A 308A 308C 308B 309B 403B 309C 309A 502A 407B 407A 305C 305B 305C 305B 305A 105C 105D 105E 105F 327A 328A 328B 316A EV ...

Page 105: ...DISPENSER PART GR L267AV T A Optional part EXPLODED VIEW 111 278A 402C 405A 275A 276A 401C 276B 277A 278B 278C 280C 280B 501A 279D 279A 279B 279C 280E 280D 279E 278F 281A 280F 278G EV ...

Page 106: ...P No 3828JD8589B AUG 2003 Printed in Korea ...

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LG LRSC26920TT, Service Manual

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