LG LSC 26945SW Service Manual Download Page 35

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1-9. Fan motor driving circuit (freezer, mechanical area)

1. The circuit cuts all power to the fan drive IC, resulting in a standby mode.

2. This circuit 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) LSC26945TT/ LSC26945SW

EXPLANATION FOR MICOM CIRCUIT

- 35 -

a , d part

b part

e part

Motor OFF

2V or less

Motor ON

2 ~ 3V

12 ~ 14V

8 ~ 16V

Summary of Contents for LSC 26945SW

Page 1: ...LEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL BEFORE CHECKING OR OPERATING THE REFRIGERATOR REFRIGERATOR SERVICE MANUAL MODEL LSC26945TT LSC26945SW COLOR SUPER WHITE TITANIUM http biz lgservice com ...

Page 2: ...TS DIAGRAM AND LIST 43 PWB CIRCUIT DIAGRAM 47 ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 49 WORKING PRINCIPLES 49 FUNCTION OF ICE MAKER 50 ICE MAKER TROUBLESHOOTING 53 ICE MAKER CIRCUIT 54 CIRCUIT 55 TROUBLE DIAGNOSIS 56 TROUBLESHOOTING 56 FAULTS 66 COOLING CYCLE HEAVY REPAIR 83 HOW TO DEAL WITH CLAIMS 90 HOW TO DISASSEMBLE AND ASSEMBLE 95 DOOR 95 HANDLE 96 FAN SHROUD GRILLE 97 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: ... TEMPERATURE CONTROL Micom Control DEFROSTING SYSTEM Full Automatic Heater Defrost INSULATION Cyclo Pentane COMPRESSOR PTC Starting Type EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R134a 185g 61 2 oz LUBRICATING OIL FREOL 10G 320 cc ITEMS SPECIFICATIONS DRIER MOLECULAR SIEVE XH 7 CAPILLARY TUBE ID Ø0 83 FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sh...

Page 5: ...1 Ref No LSC26945TT LSC26945SW PARTS IDENTIFICATION 5 Frame Display Dispenser Lamp Ice Water Dispenser Button PWB Cover Water Tubes ...

Page 6: ...If 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 6 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: ...d 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 out from the water tu...

Page 9: ...ns 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 amount of water supplied is complete check the level of water in the ice tray HOW TO INSTALL REFRIGERATOR 9 Driver 1 ON Switch ON Switch OFF 2 3 Confirm the amount of water Optimum level The quant...

Page 10: ...ction button Express Freezer Jet Freezer function selection button Dispenser and button Lock button Dispenser Lamp On Off button Filter status display RESET button Temperature adjustment button for refrigerator compartment Temperature adjustment button for freezer compartment ...

Page 11: ... temperature display from Fahrenheit to Celsius press and hold FREEZER and REFRIGERATOR buttons simultaneously for more than 5 seconds Do the same to convert back to Celsius 4 Exhibition Mode This function is available when exhibiting a refrigerator in the shopping moll Function is inserted with recognition sound Ding if pressing both the Express FRZ button and the REFRIGERATOR button at the same ...

Page 12: ...with display Notch during Icemaking Control Mode and Icemaker Stop switch is selected with ON 2 1 2 Outside temperature display function 1 The ambient temperature sensor is located under the upper right hinge cover This sensor reads the temperature of the room and displays it in the upper right corner of the display 2 The ambient temperature is displayed between 16 F and 120 F Outside of that rang...

Page 13: ...s 4 If desiring to release the lock status and pressing the lock button more than 3 seconds LOCK text is turned off at the right side of lock graphic of display with the lock release status 2 1 4 Filter condition display function 1 There is a replacement indicator light for the water filter cartridge on the dispenser 2 Water filter needs replacement once six months 3 Water filter light and FILTER ...

Page 14: ...ction Select this function to expedite freezing Press the button to cycle to toggle between the settings The arrow mark graphic remains at the ON status after flickering 4 times when selecting Special Refrigeration ICE PLUS FRZ or JET FRZ ICE PLUS freezer or JET freezer function automatically turns off after a set time Jet Freezing Not applicable to all models 2 4 Dispenser Light The dispenser lig...

Page 15: ...frost cycle is complete 9 If you press ICE PLUS within 7 minutes of compressor cut off the compressor will not operate until the 7 minute delay has passed 10 The freezer fan motor runs at high speed during the ICE PLUS cycle 2 6 JET FREEZING LSC26945TT LSC26945SW 1 JET FREEZING is a function to increase the cooling speed of the JET FREEZING compartment within the freezer by running both the compre...

Page 16: ...PENED OptiChill LED will be ON 4 Every time pressing the button the LED shows FRUIT VEGE 39 F CHILED ROOM 30 F PARTIAL FREEZING 27 F FRUIT VEGE 39 F in orders and also shows a target temperature to be controlled at the same time then the NOTCH will be changed relatively 5 The OptiChill sensor detects a desired temperature at micom and if the temperature is satisfied the OptiChill damper will be cl...

Page 17: ...part of refrigerator the BLDC motor doesn t operate more If you want to operate the BLDC motor turn off and on power resource 2 9 Control of cooling fan motor 1 The cooling fan motor performs ON OFF 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...

Page 18: ...ssor becomes 7 7 5 hour 2 In providing initial power or returning power failure frost removal starts whenever total operation time of compressor becomes 4 4 5 hour 3 Frost removal is completed if temperature of a frost removal sensor becomes more than 5 C after starting frost removal Poor frost removal is not displaced if it does not arrive at 5 C even if two hours have passed after starting frost...

Page 19: ... returns to the test mode for initial operation 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 OPTICHILL STEP DAMPER MOTOR ON FROST REMOVAL HEATER OFF FROST REMOVAL HEATER ON DAMPER DUCTDOOR OPTICHILL H...

Page 20: ...ion 3 If nonconforming matters occurred are released during display of failure code 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 display which are placed at the display part of a refrigerator All the display graphics other than a failure...

Page 21: ...ack light is turned on and all display LCD LED graphics on If releasing the button the LCD LED graphic displays the previous status the back light is turned off LCD graphic and back light ON OFF check MICOM FUNCTION 21 The other LED or LCD Graphics Turn On R2 sensor middle room or Abnormal Drive Micom Communication OptChill sensor or Water tank sensor Ice maing sensor Ice maker unit Ambient sensor...

Page 22: ...tton 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 baffle is closed 5 OptiFresh stepping motor damper is completely closed 6 All display LEDs or LCD grap...

Page 23: ...the dispenser part is turned on if pressing the dispenser press switch after selecting ice cube ice crushed ice or water If detaching the hands it is turned off 6 Selection function of water crushed cube ice 1 This is function to allow selection of water crushed cube ice function depending on user s selection Display and selection is done if pressing the dispenser selection button 2 In the initial...

Page 24: ... 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 1 LSC26945TT LSC26945SW EXPLANATION FOR MICOM CIRCUIT 24 Part VA1 CE1 CE2 CE3 CE4 CE5 Voltage 120 Vac 160 Vdc 14 Vdc 12 Vdc 15 5 Vdc...

Page 25: ...ion related to the transmission of data and calculations made by the MICOM IC1 The oscillator OSC1 must always be replaced with an exact rated part because if this spec is changes the time calculations of the MICOM will be affected and it might not work at all 1 LSC26945TT LSC26945SW EXPLANATION FOR MICOM CIRCUIT 25 ...

Page 26: ... 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 5 Vdc If the reset fails the MICOM will not operate 1 LSC26945TT LSC26945SW 26 ...

Page 27: ...r 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 LSC26945TT LSC26945SW EXPLANATION FOR MICOM CIRCUIT 27 Measuring part IC6 IC6 15 IC6 11 IC6 10 IC6 14 IC6 12 Status ON Within 1 V OFF 12 V Type of Load Compres...

Page 28: ...2 Lever Switch sensing circuit EXPLANATION FOR MICOM CIRCUIT 28 Measuring part Lever S W IC1 Micom No 16 On Press OFF 5V 0 V 60 Hz 5 V Measuring part IC7 20 IC7 19 IC7 17 IC7 15 Status ON Within 1 V OFF 12 V Type of Load GEARED MOTOR SOLENOID CUBE WATER VALVE WATER SOLENOID DISPENSER ...

Page 29: ...ils the other will not respond properly If either switch fails the light will not come on EXPLANATION FOR MICOM CIRCUIT 29 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 Refrigerator ...

Page 30: ...for defrosting and the efficiency of the defrost operation See the table below for voltages and checkpoints EXPLANATION FOR MICOM CIRCUIT 30 E F B A D G C 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 V...

Page 31: ...itch entry circuit The following circuits are sensing signal form the test switch damper motor reed switch for testing and diagnosing the refrigerator 1 LSC26945TT LSC26945SW EXPLANATION FOR MICOM CIRCUIT 31 ...

Page 32: ...re 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 32 Separation Connection Status Application Standard Connection OptiChill exist OP1 OUT OptiChill don t exist ...

Page 33: ...1 8 Stepping motor operation circuit 1 LSC26945TT LSC26945SW EXPLANATION FOR MICOM CIRCUIT 33 ...

Page 34: ...ls 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 motor EX...

Page 35: ...uit 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 LSC26945TT LSC26945SW EXPLANATION FOR MICOM CIRCUIT 35 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 36: ...LANATION FOR MICOM CIRCUIT 36 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...

Page 37: ...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 38: ... 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 2 C 3...

Page 39: ...erly 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 LSC26945TT LSC26945SW EXPLANATION FOR MICOM CIRCUIT 39 Main MICOM LCD LED dedicated MICOM DC 12V GND Transmission error status Reception notch status Main PCB L Wire FD H 4 wires Display PCB EXPR...

Page 40: ...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 40 Measuring Temperature C Freezing Sensor Cold storage sensor 1 2 Frost removal sensor Outside sensor 20 C 22 3 kΩ 77 kΩ 1...

Page 41: ...1 12 OptiChill stepping MOTOR Display 1 LSC26945TT LSC26945SW 1 13 Jet freezing 1 LSC26945TT LSC26945SW EXPLANATION FOR MICOM CIRCUIT 41 ...

Page 42: ...2 PWB parts diagram and list 2 1 PWB Assembly main part diagram 1 LSC26945TT LSC26945SW EXPLANATION FOR MICOM CIRCUIT 42 ...

Page 43: ...2 2 Parts list 1 LSC26945TT LSC26945SW EXPLANATION FOR MICOM CIRCUIT 43 ...

Page 44: ...EXPLANATION FOR MICOM CIRCUIT 44 ...

Page 45: ...2 3 DISPLAY ASSEMBLY part diagram 1 LSC26945TT LSC26945SW EXPLANATION FOR MICOM CIRCUIT 45 ...

Page 46: ...2 4 DISPLAY circuit diagram 1 LSC26945TT LSC26945SW 46 ...

Page 47: ...3 PWB Circuit Diagram may vary according to model 1 LSC26945TT LSC26945SW EXPLANATION FOR MICOM CIRCUIT 47 ...

Page 48: ...EXPLANATION FOR MICOM CIRCUIT 48 ...

Page 49: ...at cube 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 ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 49 Level Ice Maker Cube Mould for Initial Control after power ...

Page 50: ...y 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 Control Fu...

Page 51: ...fter 3 6 seconds 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 mo...

Page 52: ...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 53: ...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 54: ...ed for more than 0 5 second 2 Test button does not work during ice ejection and water supply It works when it is in the horizontal conditions If cube mould is full of ice during test function operation ice ejection control and water supply control do not work 3 Ice ejection carries out irrespect of ice formation in the ice making tray if test switch is pressed for more than 0 5 second Water shall ...

Page 55: ... 1 LSC26945TT LSC26945SW CIRCUIT 55 3854JD1125C ...

Page 56: ...l 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 co...

Page 57: ...aveitintheair 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 Afterwo...

Page 58: ...disconnected 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 v...

Page 59: ...ughthefanmotor Badinsulationofcasedoor SheathHeater rated Heaterplate Heatercord L Gap Badattachment Contraction Badadhesion Weakbindingforceathinge Fanmotor Door switch Self locked Wire is cut Badterminalcontact Contact distance Buttonpressure Meltedcontact Contact Poordoor attachment Door liner dimension Contractioninner liner Misalignment Badterminal connection Adiabatics liquid leak Faults Ref...

Page 60: ... 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 BadlowtermperatureRPMcharacteristics Rated ...

Page 61: ...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 Differentrating...

Page 62: ...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 63: ...ownfault 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 bushingassembly Support...

Page 64: ...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 65: ...nerliner Refrigerator compartmentis openedwhenfreezer compartmentis closed faultystopper High Faultydampercontrol Button is set atweak Doorisopen interferenceby food No deodorizer Poor capacity Seal condition Storageoffragrantfoods Longtermstorage Odorsfromcleanersoritemswhichshroudnot bestoredinarefrigerator Biggerdoorfoam Hinge Pintilted Poorflatness Nowasher No grease Stopperwornout Badfreezerc...

Page 66: ...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 67: ...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 68: ... 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 69: ...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 70: ...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 71: ...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 72: ...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 73: ...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 74: ...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 75: ...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 76: ...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 77: ...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 78: ...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 79: ...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 80: ...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 81: ... 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 82: ...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 83: ...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 84: ...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 85: ... 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 86: ... assembling 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...

Page 87: ...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 88: ...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 89: ...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 90: ...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 91: ...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 92: ...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 93: ...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 94: ... 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 95: ...r 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 dam...

Page 96: ...2 HANDLE 1 Aluminum short handle Model 1 Grasp the handle by both hands and hold it upward HOW TO DISASSEMBLE AND ASSEMBLE 96 ...

Page 97: ...ions 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 bank from the freezer compartment 2 Loosen two screws on the upper part of icemaker bracket 3 Disconnect icemaker bracket so that it can slide forward 4 Disconnect icemaker housing and sensor housing 5 D...

Page 98: ...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 atta...

Page 99: ...y option 1 FRAME ASSEMBLY DISPLAY 2 COVER DISPENSER 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 ...

Page 100: ...FREEZER DOOR PART LSC26945TT LSC26945SW Optional part EXPLODED VIEW 100 202A 205A 200A 210A 203A 201A 210B 210C 210B ...

Page 101: ...REFRIGERATOR DOOR PART LSC26945TT LSC26945SW Optional part EXPLODED VIEW 101 240A 232A 240C 230A 239A 231A 241B 241C 241A 243A 240A 243A 242D 147A 147B 242C 242A 242B 233A 205A ...

Page 102: ...945SW Optional part EXPLODED VIEW 102 126A 125A 125A 120C 127B 120D 271B 270C 271A 103A 312A 152A 105B 272A 135B 137A 136D 329A 135A 136B 136C 401A 408A 302B 303A 130A 121A 403D 270A 402A 400A 403A 128C 128G 128C 128E 128F 128D 128H 128D ...

Page 103: ...part EXPLODED VIEW 103 170A 271B 271C 103A 177A 166A 165A 272B 155A 146A 177B 166B 150B 401A 116A 401A 115A 150A 168A 120E 162A 162B 142D 142D 142A 270D 402A 270B 151A 142C 142B 624D 624B 624C 624A 504A 167A 167B 408B 141A 171B 171A 152A 152A 140A 140B ...

Page 104: ...T LSC26945TT LSC26945SW Optional part EXPLODED VIEW 104 614A 613A 606A 610A 404A 625A 611B 611A 611C 611D 404B 619A 616E 623A 618A 616D 616G 616F 627A 621B 612A 612B 612C 601A 605A 602A 604A 603B 603A 607A 600A 620A ...

Page 105: ...ptional part EXPLODED VIEW 105 300A 310B 307A 304A 306A 310A 317B 317A 313A 301A 307A 104A 327A 328A 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 328B 316A ...

Page 106: ...DISPENSER PART LSC26945TT LSC26945SW Optional part EXPLODED VIEW 106 278A 402C 405A 275A 276A 278B 278C 278F 401C 276B 281A 279B 281A 280C 280B 280A 501A ...

Page 107: ...P No 3828JD8797F JUN 2006 Printed in Korea ...

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LG LSC 26945SW, Service Manual

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