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LG LSC27926, Service Manual, Page: 23 / 101

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LG LSC27926 Service Manual Download Page 23

1. Explanation for PWB circuit

1-1. Power circuit

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 

- 2

3

-

Part

VA1

CE1

CE2

CE3

CE4

CE5

Voltage

120 Vac

160 Vdc

14 Vdc

12 Vdc

15.5 Vdc

5 Vdc

The power circuit includes a Switched Mode Power Supply (SMPS). It consists of a rectifier (BD1 and CE1) converting AC

Summary of Contents for LSC27926

Page 1: ...CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL BEFORE CHECK INGOR OPERATINGTHE REFRIGERATOR SERVICE MANUAL MODEL LSC27926 REFRIGERATOR ...

Page 2: ...ARTS DIAGRAM AND LIST 40 PWB CIRCUIT DIAGRAM 43 ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 4 6 WORKING PRINCIPLES 46 FUNCTION OF ICE MAKER 47 ICE MAKER TROUBLESHOOTING 48 ICE MAKER CIRCUIT 49 CIRCUIT 53 TROUBLE DIAGNOSIS 54 TROUBLESHOOTING 54 FAULTS 64 COOLING CYCLE HEAVY REPAIR 81 HOW TO DEAL WITH CLAIMS 88 HOW TO DISASSEMBLE AND ASSEMBLE 93 DOOR 93 HANDLE 94 FAN SHROUD GRILLE 95 ICEMA...

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: ... CYCLE DEFROSTING DEVICE ANTI SWEAT HEATER Dispenser Heater ANTI FREEZING HEATER Damper Heater FREEZER LAMP REFRIGERATOR LAMP DISPENSER LAMP 724 mm 28 1 2 in 1004 mm 39 1 2 in 912 mm 35 9in 779 mm 30 5 8 in 829 mm 32 5 8 in 897 mm 35 5 16 in 1261 mm 49 5 8 in 1741 5 mm 68 1 2 in 1746 5 mm 68 3 4 in 1771 mm 69 11 16 in 1771 mm 69 11 16 in w e i V p o T w e i V t n o r F PTC Starting Type Micom Cont...

Page 5: ...r Compartment Refrigerator Compartment Humidity Switch Lamp Shelf Snack Drawer Vegetable Drawer Vegetable Drawer Meat Drawer Door Rack Shelf Door Rack Wine Holder Lamp Lower Cover Dairy Product Corner Door Rack Drawer Wire Plastic Automatic Icemaker Door Rack Shelf Bottle Guide Door Rack Water Filter Egg Box ...

Page 6: ...irst If the refrigerator is not installed on a flat floor the height of freezer and refrigerator door may not be the same 1 If the freezer door is lower than the refrigerator door 2 If the freezer door is higher than the refrigerator door HOW TO INSTALL REFRIGERATOR 6 Z 1 2 ...

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: ... ice cube sticks together decrease the water supplying time This happens when too much water is supplied into the ice tray Caution When adjusting the amount of water supplied adjust step by step Otherwise the water may spill over 3 When adjustment of control switch for the amount of water supplied is complete check the level of water in the ice tray HOW TO INSTALL REFRIGERATOR 9 Driver 1 ON Switch...

Page 10: ...LTER ALARM LOCK 3SECS Dispenser selection button Ice Plus function selection button Alarm button and Lock button Lamp On Off button Filter status display RESET button Temperature adjustment button for refrigerator compartment Temperature adjustment button for freezer compartment C F ...

Page 11: ... 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 ICE PLUS button and the REFRIGERATOR button at the same time for more than 5 seconds If functio...

Page 12: ... function 1 Outside temperature sensor at the right Hinge Cover U of refrigerator senses ambient temperature and displays the outside temperature in the upper of ROOM TEMP text on the display part 2 Ambient temperature is displayed up to 16 F 120 F and displayed as Lo for less than 15 F and as HI for more than 121 F If the ambient temperature sensor fails it is displayed as Er 3 Since display temp...

Page 13: ...ng 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 MICOM FUNCTION 13 LOCK DISPENSER BUTTON LOCK DISPENSER BUTTON LOCK CONTROL Classification FilterStatus Display FILTERRESET FILTER 1 There is a replacement indicator light for the wate...

Page 14: ...enever pressing ICE PLUS ICE PLUS function automatically turns off 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 pressing FILTER RESET LIGHT button If dispenser light continuously turns on more than 7 minutes with dispenser light button the dispenser light turns o...

Page 15: ...tinuously operating compressor and freezing room fan 7 If frost removal starting time is arrived during ICE PLUS ICE PLUS operation is done only for the remaining time after completion of frost removal when the ICE PLUS operation time passes 90 minutes If passing 90 minutes ICE PLUS operation is done only for 2 hours after completion of frost removal 8 If pressing ICE PLUS button during frost remo...

Page 16: ... 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 fai...

Page 17: ...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 18: ... 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 19: ......

Page 20: ...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 20 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 21: ...ss 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 open of baffle 5 Optichil stepping motor damper is c...

Page 22: ...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 23: ...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 23 Part VA1 CE1 CE2 CE3 CE4 CE5 Voltage 120 Vac 160 Vdc 14 Vdc 12 Vdc 15 5 Vdc 5 Vdc The power circuit includes a Switched Mode Power Supply SMPS It consists of a rectifier BD1 and CE1 converting AC ...

Page 24: ... to its original speed A B C and D of door switch for the freezer or refrigerator are connected to the door open sensing circuit in paralle 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 Measuring part IC6 IC6 16 IC6 13 IC6 12 IC6 15 IC6 14 Status V 1 n i h t i W N O V 2 1 F F O Ty...

Page 25: ...EXPLANATION FOR MICOM CIRCUIT 25 ...

Page 26: ...If either switch fails the light will not come on EXPLANATION FOR MICOM CIRCUIT 26 s u t a t s f f O t a e r a s d n e h t o b t a h c t i w S D C B A V 5 g n i s o l C s u t a t s n O t a e r a s d n e h t o b t a h c t i w S D C B A V 0 g n i n e p O Measuring part IC1 MICOM No 44 45 45 46 47 48 Pin Door of Freezer Refrigerator ...

Page 27: ...t EXPLANATION FOR MICOM CIRCUIT 27 A B C D F E RW1 10KF CE18 R73 CC32 1 6 Switch entry circuit The following circuits are sensing signal form the test switch damper motor reed switch for testing and diagnosing the refrigerator 46 47 ...

Page 28: ...he 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 d r a d n a t S n o i t a c i l p p A s u t a t S n o i t c e n n o C n o i t a r a p e S t s i x e l l i h C i t p O n o i t c e n n o C OP1 n o d l l i h C i t p O T U O t exist 28 1 8 Stepping motor operation circuit ...

Page 29: ... 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 EXPLANATION FOR M...

Page 30: ...anges 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 EXPLANATION FOR MICOM CIRCUIT t r a p e t r a p b t r a p d a s s e l r o V 2 s s e l r o V 2 V 5 F F O r o t o M V 6 1 8 V 4 1 2 1 V 3 2 N O r o t o M a b d e 30 ...

Page 31: ...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 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 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 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 Down Down Down Down change Up Up Up Up Up 3 C 2 5 C 2 C 1 5 C 1...

Page 32: ...compensation value Remarks JCR3 JCR4 JCR1 JCR2 at refrigerator 0 C In shipment from factory 1 T U C C 1 8 F 1 T U C C 1 8 F 1 T U C C 1 8 F CUT 1 C 1 8 F 2 T U C T U C C 3 6 F CUT CUT 2 C 3 6 F 0 T U C T U C C 0 F 0 T U C T U C C 0 F 0 T U C T U C C 0 F 0 T U C T U C C 0 F 1 T U C T U C T U C 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 33: ...nal lead wire 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 EXPLANATION FOR MICOM CIRCUIT MainMICOM LCD LED dedicatedMICOM DC12V GND Transmission errorstatus Reception...

Page 34: ...e measured with a digital tester after separating CON8 of the PWB ASSEMBLY and the MAIN part 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 Measuring Temperature C Freezing Sensor Cold storage sensor 1 2 Frost removal sensor Outside sensor 20 k 3 2 2 C Ω 77 k Ω 15 k 9 6 1 C Ω 60 k Ω...

Page 35: ...EXPLANATION FOR MICOM CIRCUIT 35 ...

Page 36: ...EXPLANATION FOR MICOM CIRCUIT 36 ...

Page 37: ...EXPLANATION FOR MICOM CIRCUIT 37 ...

Page 38: ... 38 ...

Page 39: ...EXPLANATION FOR MICOM CIRCUIT 39 ...

Page 40: ... 40 ...

Page 41: ... 41 ...

Page 42: ...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 ICEMAKERANDDISPENSERWORKINGPRINCIPLESANDREPAIR Level Ice Maker Cube Mould for Initial Control after power is input Power Input I...

Page 43: ...ater supply water shall be supplied for the previous setting time But it will supply for the amended time from the next supply 4 When water supply signal is applied to water and ice valves at the same time during water supply water shall be supplied to water valve If water supply signal is applied to ice valve during water supply water shall be supplied to both water and ice valves 2 3 Ice Making ...

Page 44: ...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 motor o...

Page 45: ...ch When 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 an...

Page 46: ... Ice Maker Unit Is the resistance of both ends 9 10 of ice ejection motor of CON9 between 18 and 22 Ω 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 pressed fo...

Page 47: ...4 Ice Maker Circuits ICEMAKERANDDISPENSERWORKINGPRINCIPLESANDREPAIR 47 ...

Page 48: ...tton 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 be splashed if test switch is pressed...

Page 49: ...CIRCUIT 3854JK1010C 49 ...

Page 50: ...kness of terminal Bad connection between plug and adapter faulty plug The distance between pins Pin outer diameter Nopoweron powercord OLPisoff Noelectricpoweroncompressor Faultycompressor FaultyPTC Disconnectedcopperwire Internalelectricalshort Faultyterminalcontact Disconnected CapacityofOLPissmall CharacteristicsofOLPisbad Badconnection Poweris disconnected InnerNi Crwireblowsout Badinternalcon...

Page 51: ...ion Leaveitintheair Moisturepenetration intotherefrigerationoil Capsaremissed Airblowing Duringtransportation Duringwork Notperformed Performed Tooshorttime Lowairpressure Lessdryair AirBlowing Leaveitintheair Capsaremissed Shortpipeinsert Pipegaps Toomuchsolder Toolarge Damagedpipes Notdriedinthecompressor Elapsedmorethan6monthsafterdrying Capsaremissed Nopressurewhenitisopen Duringresttime After...

Page 52: ...n Capdrainisnotdisconnected Injectthroughthe hole Sealwithdrain Adiabaticslumpinput Damagebyascrewor clamp Otherforeignmaterialsinput Parts disconnected Wireiscut Heatingwire Contactpoint betweenheating andelectricwire Dentbyfinevaporator Poorterminalcontacts Wireiscut Leadwire Heatingwire Contactpoint betweenheatingand electricwire Heatingwireiscorroded Waterpenetration Badterminalconnection Chec...

Page 53: ...lationofcasedoor SheathHeater rated Heaterplate Heatercord L Gap Badattachment Contraction Badadhesion Weakbindingforceathinge Fanmotor Doorswitch Selflocked Wireiscut Badterminalcontact Contactdistance Buttonpressure Meltedcontact Contact Poordoor attachment Doorliner dimension Contractioninner liner Misalignment Badterminal connection Adiabaticsliquid leak Faults Refrigeratorandfreezerswitchreve...

Page 54: ...torRPM Faultyfan Shorud Bent Iceandforeignmaterialsonrotatingparts Fanshroudcontact Clearance Dampingevaporatorcontact Accumulatedresidualfrost Fanmisuse Badshape Looseconnection Nottightlyconnected Insertdepth Ratingmisuse Smallcapacity Lowvaltage Malfunctionofchargingcylinder Wrongsettingofrefrigerant Insufficientcompressor Faultycompressor Fanoverload Fanmisuse BadlowtermperatureRPMcharacterist...

Page 55: ...iabaticsliquidleak Foreignmaterials Adiabaticsdumpliquid Faultycontact Faultytemperaturecharacteristics Externalairinflow Bushinginstalledincorrectly Dooropens butnotcloses Gaparoundgasket Contraction distortion loose doortwisted cornernot fullyinserted Foodvapor Storinghotfood Unsealedfood Dooropens butnotcloses Gasketgap Coolairleak andtransmitted Highambienttemperature Spaceissecluded Different...

Page 56: ...Compressor sound Sound from machine itself inserted Sound from vibration Restrainer Bushing Too hard seat Distorted Aged Burnt Stopper Bad Stopper assembly inner diameter of stopper Tilted Not Compressor base not connected Bad welding compressor stand fallen Foreign materials in the compressor compartment OLP sound Chattering sound Insulation paper vibration Capacitor noise Pipe contacts each othe...

Page 57: ...door hinge Itsownfault Coregap Badconnection Correctscrewconnection Badassembly Distortion Foreignmaterialsinside Badconnection Partlydamaged Notconnected Badpipecaulking Normaloperatingsound Vibrationsound Agedrubberseat Badtorqueforassemblingmotor bracket Fanguidecontact Shroudburrcontact Dampingevaporatorcontact Residualfrostcontact Unbalance Iceonthefan Airintake oppositetomotor bushingassembl...

Page 58: ...re reversed Travlel 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 contact...

Page 59: ...ndoorlinerandinnerliner Refrigerator compartmentis openedwhenfreezer compartmentis closed faultystopper High Faultydampercontrol Buttonissetat weak Doorisopen interferenceby food Nodeodorizer Poorcapacity Sealcondition Storageoffragrantfoods Longtermstorage Odorsfromcleanersoritemswhichshroudnot bestoredinarefrigerator Biggerdoorfoam Hinge Pintilted Poorflatness Nowasher Nogrease Stopperwornout Ba...

Page 60: ...r cord and products Replace with rated fuse Electricity leakage Check the resistance of power cord If fuse blowns out 0 s i t i f i r e t s e t h t i w e g a t l o v h g i H Ω m r i f n o c y l t n e u q e r f d e t r o h s s i t i Short circuit of components the cause and prevent tracking due to moisture and dust penetration s k r a m e R s e r u s a e M s k c e h C s e s u a C s m e l b o r P t ...

Page 61: ...on faulty operation Confirm icing causes and repair h c t i w s r o o d e c a l p e R k c e h c o t n o t t u b s s e r P n o i t a r e p o h c t i w s 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 ...

Page 62: ...side 2 Check the end of compressor sealing pipe low 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...

Page 63: ... w e n i l g n i g r a h c s i d r e s n e d n o c m r a w s i e p i p 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 evacua...

Page 64: ... s n i e c i f o s e i t i r u p m I 1 f i r e t a w t o h n i r u o p d n a s r u o h 3 k c e h c o t e l o h e h t h g u o r h t e c I 2 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 Suction duct and 1 Confirm in the...

Page 65: ... p a g e h t g n i t s o r f e d e t a l p r e t a e h f o p a g e h t y b g n i c I 3 2 Check 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 w...

Page 66: ... it d e r i a p e r e b t o n n a c t n e m e c a l p e r d n a y l b m e s s a r o o D t e k s a g y t l u a F Faulty assembly 3 Overcooling in the refrigerator Check refrigerator compartment Replace faulty parts n o t t u b n e h w d e l o o c r e v o s i t n e m t r a p m o c Faulty damper in the refrigerator pressed on weak compartment Check parts are faulty Faulty MICOM faulty sensor 4 Bad de...

Page 67: ...b t i e c a l p e r d n a s n o i t i d n o c s n o i t i d n o c t e k s a g y t l u a F e h t n i g n i c I shute Faulty assembly Check door assembly conditions Door assembly and replacement 3 Over freezing in the freezer Refrigerator operates pull down Replace defective parts d e t a r e p o s i t i f i k c e h C t n e m t r a p m o c y l t n e t t i m r e t n i M O C I M y t l u a F The Temper...

Page 68: ...ce 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 n e e w t e b e c n a r a e l c a e v a e L 7 d n u o s interfering parts and seal gaps in 3 Fan operation sound in the freezer 3 1 Check fan insertion depth and the structures e k a m h c i h w s t r a p e h t e l b m e s s a e R 8 e g...

Page 69: ...ion 2 2 Check capillary tube touches and restrainer if it is severe e p i p d n a r o s s e r p m o c y l l a i c e p s e k c a b r e v o c s t r a p d n a e r u t c u r t s r e h t O 5 t i f i r e p p o t s r o s s e r p m o c e c a l p e R 4 r e p p o t s r o s s e r p m o c k c e h C 1 3 n o i t a r b i v y l e r e v e s s e t a t b i v n o i t a r b i v 4 1 Check vibration of front and rear mo...

Page 70: ...nt Explain the principles of freezing cycles It happens when refrigerant passes Check the sound when compressor is Explain the principles of freezing cycles y b n o n e m o n e h p g n i w o l f t n a r e g i r f e r d n a n o d e n r u t y b s e p i p l a n r e t n i r o t a l u m u c c a n i e c i f i r o d n u o s g n i w o l f the pressure difference between Check the sound when compressor is ...

Page 71: ...ps 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 e s u o t t o n s r e m o t s u c e d a u s r e P g a b d n a l w o b c i t s a l p s r o d o It happens in the new refrigerator plastic bag or wraps with wet food or odorous foods Odor from the Odor from the ...

Page 72: ...r e t 5 0 8 7 2 1 8 7 s t r a p t i u c r i c 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 h t i w l e d o m f f o s i r e w o p n e h w t u c e r a d e g a m a d dispenser Abnormal Bad connection Lead Wire connecting Check Lead Wire terminals Reconnect L...

Page 73: ...s table of sensor in circuit 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 vol...

Page 74: ...P n i y a l e r in circuit 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 Check the resistance of Replace refrigerator Refer to sensor...

Page 75: ...ntinuously 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 e d i u g m r a l a g n i n e p o does not work t i u c r i c n i t i u c r i c r o e c a l p e r d n a e r i w d n a B C P n i a m n i t c a t n o c l a n i m r e t d n u o s t o n n o t t u b y a l p s i d n o i t a n a l p x e d a b t c e n n...

Page 76: ...er 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 Defective relay associa...

Page 77: ... e t o r p w o l f e s r e v e r h t i w d e p p i u q e e e r g e d 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 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 a...

Page 78: ...ssor operates electronic scales pinch off Weld carefully after pinching off the inlet pipe plier gas welding machine r o t c e t e D k a e L c i n o r t c e l E s t n i o j d l e w t a k a e l k c e h C 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...

Page 79: ...DER 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 cm 2 5 ...

Page 80: ...fter 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 ...

Page 81: ...arging canister 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 Besuretochargethe refrigerantataround 25 C 77 F Be...

Page 82: ...er of 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 ...

Page 83: ...3 6 Brazing Reference Drawings TROUBLE DIAGNOSIS 83 ...

Page 84: ...ernal 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 3600 RPM This so...

Page 85: ...t t i h d n a Hiss and 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 i...

Page 86: ...cteristics 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...

Page 87: ...ntrol button 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 ...

Page 88: ...cover of 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 yo...

Page 89: ... 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 90: ...2 HANDLE 1 Aluminum short handle Model 1 Grasp the handle by both hands and hold it upward HOW TO DISASSEMBLE AND ASSEMBLE 90 ...

Page 91: ...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 92: ...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 93: ...DECO FRAME DISPLAY 4 PWB PCB ASSEMBLY DISPLAY 5 BUTTON ASSEMBLY 6 BUTTON DECO 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 17 Cap Assembly Duct Detailed Drawings 93 ...

Page 94: ... EV EXPLODED VIEW FREEZER DOOR PART 200A 241F 241G 201A 203A 241G 241E 700A 243A 94 212J ...

Page 95: ... EV EXPLODED VIEW REFRIGERATOR DOOR PART 241A 230A 241C 241B 241H 237A 241H 241H 237A 241D 233A 231A 212G 700A 243B 95 212J ...

Page 96: ... EV EXPLODED VIEW FREEZER COMPARTMENT 281A 271B 271A 330B 405G 404A 405A 329A 610E 128D 128D 128F 128C 128C 128E 316B 301A 401A 281G 106A 103C 418A 319B 332B 158C 409B 332A 136B 136A 149B 149A 903E 96 ...

Page 97: ...DED VIEW REFRIGERATOR COMPARTMENT 281B 271B 271C 120B 120A 610E 610E 128J 128K 409A 158B 128B 128A 151B 154A 161A 151A 161B 281H 158A 140A 146A 141A 128H 140B 128G 170A 409B 604H 611C 611E 611A 106A 903D 97 281K ...

Page 98: ... EV EXPLODED VIEW ICE WATER PART 621B 614A 110B 606A 412B 149E 128L 149D 131A 131C 619A 412A 612A 612C 612B 600A 607A 602A 600B 406D 125A 303B 610A 98 616E 625A 622B 616D 627D 627D 627C 627A ...

Page 99: ... EXPLODED VIEW MACHINE COMPARTMENT 103B 501F 411A 410G 410H 103A 501A 501K 304A 328A 105A S15 319C 329C 323B 308A 309A 404B 405C 319E 319A 419A 305C 305B 315A 312A S38 305B 305C 412D 310A 316A 307A 317A 99 ...

Page 100: ... EV EXPLODED VIEW DISPENSER PART 278A S18 282G 113E 405H 617A 161C 409B 113F 501B 501B 276C 276C 279B 279B 279A 280F 278G 281F 276A 276B 279A 280F 281F 276A 276B Only model LSC27926ST 100 ...

Page 101: ...February 2009 MFL62215904 ...

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