LG LSC27990TT Service Manual Download Page 78

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Summary of Contents for LSC27990TT

Page 1: ...http aic lgservice com REFRIGERATOR SERVICE MANUAL CAUTION PLEASEREAD CAREFULLYTHE SAFETYPRECAUTIONSOF THIS MANUAL BEFORECHECKINGOR OPERATINGTHE REFRIGERATOR MODEL LSC27990TT COLOR TITANIUM ...

Page 2: ...NSER WORKING PRINCIPLES AND REPAIR 45 WORKING PRINCIPLES 45 FUNCTION OF ICEMAKER 46 CIRCUIT 48 TROUBLE DIAGNOSIS 49 TROUBLESHOOTING 49 FAULTS 59 COOLING CYCLE HEAVY REPAIR 76 HOW TO DEAL WITH CLAIMS 83 TV RADIO 88 SAFETY PRECAUTIONS 88 FEATURE 88 CONTROLS 89 REMOTE CONTROL KEY FUNCTIONS 90 TROUBLESHOOTING 91 BLOCK DIAGRAM 92 TV PART DISASSEMBLE 93 HOW TO DISASSEMBLE AND ASSEMBLE 94 DOOR 94 HANDLE ...

Page 3: ...aterials from the housing and connecting parts 8 Do not fray damage run over kink bend pull out or twist the power cord 9 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 insert fingers or tools into the icemaker The geared motor drive could cause an injury or damage to tools or the ic...

Page 4: ...ire Condenser R134a 185g 61 2oz FREOL 10G 320 cc ITEMS DRIER CAPILLARY TUBE FIRST DEFROST DEFROST CYCLE DEFROSTING DEVICE ANTI SWEAT HEATER ANTI FREEZING HEATER FREEZER LAMP REFRIGERATOR LAMP DISPENSER LAMP SPECIFICATIONS MOLECULAR SIEVE XH 7 ID a0 83 4 5 Hours 13 15 Hours Heater Sheath Dispenser Duct Door Heater Dispenser Heater Water Tank Heater Damper Heater 40W 1 EA 40W 4 EA 15W 1 EA t _o Ob O...

Page 5: ...l J iili c _ Water Tubes Automatic Icemaker Freezer Compartment Refrigerator Compartment Dairy Product Corner Water Filter Lamp Shelf Lamp Shelf Drawer Door Rack Drawer Door Rack Shelf Snack Drawer Door Rack Lamp Bottle Guide Vegetable Drawer OptiFresh Door Rack Lower Cover OptiFresh Display Humidity Switch 5 ...

Page 6: ...n of the arrow clockwise until the refrigerator is level 3 When the refrigerator door is lower than the freezer door Adjust the level when the refrigerator door is lower than the freezer door during the use of the refrigerator 1 Using the wide side of the tool for adjustment O turn the keeper nut O _ _ clockwise to loosen the keeper nut 2 Using the narrow side of the tool for adjustment turn the a...

Page 7: ...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 When the cartridge is removed you will feel it click Pull out the cartridge NOTE There will be some water 25cc in the filter cartridge Some spilling may occur Catch it in a bowl or towel 3 Flush the Water System After Replacin...

Page 8: ...start the Test mode 2 Test the operation of the operating part of the icemaker 3 If there is no problem with the operation water is supplied through the water tube up to the selected lebel of water 4 The test mode is completed after the water is supplied Note When using the test mode more than twice consecutively water can overflow When the water overflows wipe the ice storage bin Check water leve...

Page 9: ...MICOM FUNCTION 1 Monitor Panel 1 1 GR G277STSA LSC27990TT Temperature Adjust Button Calendar oe OSe ect oo u ooJ Dispenser Selection Button I Lock Button Door Alarm Button Dispenser Light Button 9 ...

Page 10: ...nter the DEMO mode press and hold the TEMPERATURE and _ I_ button simultaneously for 5 seconds until the Ding sounds in the lock status To exit the DEMO mode and return to normal operation press and hold the TEMPERATURE and _ I_1 button simultaneously for 5 seconds until the Ding sounds again in the lock status The refrigerator will default to the NORMAL mode DEMO mode OFF if the power fails 2 LCD...

Page 11: ...et temperature not actual temperature within refrigerator Refrigeration function is weak in the initial time Please adjust temperature as above after using refrigerator for minimum 2 3 days Freezer Notch is fixed COLDER unconcerned 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 senso...

Page 12: ...e the lock status and pressing the lock button more than 3 seconds Lock icon is disappeared at the right 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 You will see a reminder pop up window in the LCD screen 2 weeks before 1 we...

Page 13: ...he dispenser for a few seconds after dispensing ice or water to catch the last few drops or pieces of ice 2 3 ICE PLUS Freezing Select this function to expedite freezing Turn on off the IcePlus function using the IcePlus button within the Temperature function Pressing Switch H l The IcePlus icon remains at the ON status after animation when selecting Special Refrigeration IcePlus FRZ ICE PLUS free...

Page 14: ...E PLUS will run for only 2 hours at the end of the defrost cycle 8 If you press ICE PLUS during a defrost cycle the ICE PLUS indicator will illuminate but the compressor will not operate until the defrost 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 du...

Page 15: ...and plug it in again 2 8 Control of cooling fan motor 1 The cooling fan motor performs ON OFF control by linking with the COMPRESSOR 2 It controls at the single RPM without varying RPM 3 Failure sensing method is same as in fan motor of freezing fan motor refer to failure diagnosis function table for failure display 2 9 Door opening alarm 1 The buzzer sounds when any door is held open for more tha...

Page 16: ...1 Defrost is cycled whenever the compressor s runtime reaches 7 7 hours 2 In providing initial power or returning power failure defrost starts whenever total operation time of compressor becomes 4 4 hour 3 Defrost 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 hour...

Page 17: ...ST 0 3 FROST POWER sec REMOVAL sec REMOVAL HEATER_ HEATER ON ON OFF 6 0 sec DAMPER 0 3 DAMPER sec DUCT DOOR _ DUCT DOOR OPTICHILL OPTICHILL HEATER ON HEATER OFF 0 3 PIPE 0 3 PIPE 0 3 0 3 F FAN O 3 O 30PTICHILL c sec sec COMP sec sec R STEP sec STEP _ DISP _ DISP _ _ MOTOR _ DAMPER HEATER HEATER ON C FAN DAMPER MOTOR ON OFF ON ON ON TEST SWITCH PRESS _ Onc_ OPTICHILL OTHER 0 3 COMP 0 3 F FAN 0 3 R ...

Page 18: ... 19 NORMAL DISPLAY NOTE 2 See PaCe 19 NORMAL OlSFLAY NOTE 2 See Pace 19 FREEZER SENSOR SHORTCIRCUIT REFRIGERATOR SENSOR 1 SHORT CIRCUIT REFRIGERATOR SENSOR 2 SHORT CIRCUIT ABNORMAL SHORT CIRCUIT DEFROST HEATER TEMPERATURE FUSE SHORT CIRCUIT UNPLUGGED CONNECTOR INDICATED 4 HOURLATER AFTER TROUBLE MOTOR DEFECT HOOKED OF LEAS WIRETOFAN CONTACTOF STRGCTRES WITHFAN SHORTOR OPEN OFLEADWIRE THEREIS NOSIG...

Page 19: ...AYPARTGRAPHICONTHE E_PARTTURNSON ABNORMAL DISPLAY PARTGRAPHIC ON THE _F_ PART TURNS OFF 2 TEST FUNCTION TESTKEYEXISTS ONPWBASSY MAINBOARD MODE OPERATION CONTENTS REMARKS 1 CONTINUOUS OPERATION OF COMPRESSOR 4 MAIN STEPPING MOTOR DAMPER IS COMPLETELY PRESS TEST BUTTON ONCE 2 CONTINUOUS OPERATION OF FREEZING BLDC MOTOR OPENED OPEN OF BAFFLE FREEZING FAN TURNS OFF TEST1 STRONG COLD MOOE HIGH SPEED RP...

Page 20: ...button once at the test mode 1 status forced defrost mode 1 2 3 4 5 6 1 2 3 4 5 Contents Continuous operation of compressor Continuous operation of freezing BLDC motor high speed RPM and cooling BLDC motor Defrost heater turns off Stepping motor damper is completely opened baffle is closed OptiFresh stepping motor damper is completely closed All display LCD graphics turn on Compressor OFF Freezing...

Page 21: ... another 5 seconds 5 The dispenser lamp turns on automatically if the crushed cubed water button is pressed or if the dispenser button is pressed It will turn off automatically shortly thereafter 6 Selection function of water crushed cube ice 1 Select crushed cubed water The display will show your selection 2 If you select cubed ice the auger is rotated to dispense cubes 3 If you select crushed ic...

Page 22: ...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 Part VA1 Voltage 120 Vac CE1 CE2 CE3 CE4 CE5 160 Vdc 14Vdc 12 Vdc 15 5 Vdc 5 Vdc 1 GR G277STSA LSC27990TT 03 _A60 TRA_ L 2_4 8 CC2 64 VD3 5_3 Vc_eP TEST ...

Page 23: ...time calculations of the MICOM and it might not work at all 1 GR G277STSA LSC27990TT CSTS4 0ObIG03 I _i I 30 F_0 1 EC _ _ __ _t _T 3 XlN MICOM XOUT 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...

Page 24: ...en at MICOM _ In the TEST mode the fan will stop if any door is opened It will resume operation when the door is closed Defrost AC Converting Refrigerator Dispenser Type of Load Compressor Heater Relay LAMP Heater Measuring part IC6 IC6 16 IC6 13 IC6 12 IC6 15 IC6 14 ON Within 1 V Status OFF 12 V 1 GR G277STSA LSC27990TT _F L F DOOR BWITC_ A_P C0N2 F_J_N K_ CAPACkTO_ ST_TI_ C_IT C_ Ob P T C ASSy s...

Page 25: ...DI_2 _ _ 15 _ Y4 1_007 FN414B n_ PaO Pol o Po2 Z co Po3 c Ps IE N _ 0 R P21 1 Check load driving status Type of Load GEARED MOTOR SOLENOID CUBE WATER VALVE WAT ER PILOT VALVE SOLENOID DISPENSER Measuring part IC7 15 IC7 14 IC7 13 IC7 12 IC7 11 ON Within 1 V Status OFF 12 V 2 Lever Switch sensing circuit _leasuring part Lever S W On ICl Micom No 16 OHz OFF 5V 25 ...

Page 26: ...g part ICl MICOM No 44 45 45 46 47 48 Pin Door of Freezer and Refrigerator Closing 5 V _ _ _ Switch at both ends are at Off status Opening 0 V _ _ _ _ Switch at both ends are at On status Since door switches A and B are interconnected if either fails the other will not respond properly If either switch fails the light will not come on 26 ...

Page 27: ...n both the freezer and the refrigerator The icemaker sensor detects when ice is made The defrost sensor determines both the need for defrosting and the efficiency of the defrost operation See the table below for voltages and checkpoints SENSOR CHECK POINT NORMAL 22 OF 122 OF IN SHORT IN OPEN Freezing sensor POINT _ Voltage Defrost sensor POINT B Voltage Refrigerator sensor 1 POINT _C_ Voltage 0 5 ...

Page 28: ... 41 P40 T 28_ 4 7K _k CCIO _223 o 5Wlo 1 9 Option designation circuit model separation function 1 GR G277STSA LSC27990TT 4o7K_ 36 37 P28 P24 The circuits shown above vary according to which features are included on your particular model Separation Connection Status Application Standard Connection OptiFresh exist OP1 OUT OptiFresh don t exist I_These circuits are preset at the factory and cannot be...

Page 29: ... sending signals of 3 33 mSEC via MICOM pins 33 34 and 35 as shown in the chart below These signals are output via terminals 10 11 14 and 15 via input terminals 3 6 and 8 of IC10 TA7774F the motor drive chip The output signals allow the coils wound on each phase of the stator to form a magnetic field which causes rotation Input to the terminals INA and INB of IC10 as shown in the chart below drive...

Page 30: ... This circuit stops the fan motor by cutting off power to the fan when it senses a lock up condition part part part Motor OFF 5V 2V or less 2V or less Motor ON 2 3V 12 14V 8 16V 1 GR G277STSA LSC27990TT P54 C FAN PWM 53 PSI 50 C FAN LOCK ICI MIOOM P53 52 F FAN PWM P50 49 F FAN LOCK R38 4 7K 33O DI4 FRI07 L3 CEIO TDI5 _ CCl7 220uF 7 R40 _ FRI07 223 ZSV T IOK 330 R45 R45 3 9K R47 IOK CCI8 DI7 CEll F...

Page 31: ... C 7 2 F 56 k_ _ 2 0 C 3 6 F 33 k_ 2 3 C 5 4 F 33 k_ _ 1 5 C 2 7 F 18 k_ 2 2 C 3 6 F 18 k_ _ 1 0 C 1 8 F 12 k_ 2 1 C 1 8 F 12 k_ _ 0 5 C 0 9 F 10 k_ 2 0 C O F 10 k_ _ 0 C O F Referencetemperature 8 2 k_ _ 1 C 1 8 F 8 2 k_ _ 0 5 C 0 9 F 5 6 k_ _ 2 C 3 6 F 5 6 k_ _ 1 0 C 1 8 F 3 3 k _ 3 C 5 4 F 3 3 k _ 1 5 C 2 7 F 2 k _ 4 C 7 2 F 2 k _ 2 0 C 3 6 F 470 _ 2 5 C 9 F 470 _ 2 2 5 C 4 5 F Cooler 1_Tempera...

Page 32: ...C 2 C 2 7 F 3 6 F Up Up 1 C 1 5 C 1 8 F 2 7 F Up Up 0 5 C 1 C 0 9 F 1 8 F Up Up No 0 5 C _ 0 9 F change Up 3 5 C 3 C i2 5 C 2 C 18 kL 2 6 3 F 5 4 F 4 5 F 3 6 F Down Down Down ii Down 4 C i3 5 C 3 C _ 2 5 C 33 k _2 _ 7 2 F I 6 3 F 5 4 F 4 5 F Down Down Down Down 1 5 C i 1 C I 2 7 F I 1 8 F Down Down 2 C i 1 5 C i 3 6 F I 2 7 F Down Down 0 5 C No 0 9 F Down change 1 C 0 5 C 1 8 F 0 9 F Down Down 2 5...

Page 33: ...5 6 CUT 5 6 CUT CUT 5 5 6 CUT 5_6 CUT JCR4 5 CUT 6 5 5 6 CUT 5 6 5 5 6 CUT CUT CUT CUT CUT Compensation for too cold JCR1 JCR2 5 5 5 5 6 6 CUT CUT 6 6 0 6 CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT Temperature compensation value at refrigerator 0 C In shipment from factory 1 C 1 8 F 1 C 1 8 F 1 C 1 8 F 1 C 1 8 F 2 C 3 6 F 2 C 3 6 F 0 C 0 F 0 C 0 F 0 C 0 F 0 C 0 F 1 C 1 8 F 1 C 1 8 F ooc o F Remar...

Page 34: ...en 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 dedicated MICOM for LCD control of display PCB MainMICOM DC 12V GND Transmission error status Reception notch status LCD LED dedicated MICOM 1 GR G277STSA LSC27990TT IC MICOM 42 P41 P42 43 R...

Page 35: ...istance value allowance of sensor is 5 I_ When measuring the resistance value of the sensor allow the temperature of that sensor to stabilize for at least 3 minutes before measuring This delay is necessary because of the sense speed relationship I_ Use a digital tester to measure the resistance An analog tester has to great a margin of error I_ Resistance of the cold storage sensor 1 and 2 shall b...

Page 36: ...27990TT _ Z L_ CO EL H i L_ O H F_ lAIN41 P_4 Pl5 PI6 P20 r OPTION 3 _ 2h 22 23 Rra9 9 16 iCu_6 1 2 IC_ IOK 1 3 ST _ 61 1 A 3__ 2f_ IKF _v_ TA7774P 4 5 2 13 CON8 MA_LC _M _TI F_SH A ISTEPPlNG r_7 _ 2K 014 E KTAIZ_3 L _ J c _ R73 _ 1_59 2 5 21 4 7_ L Oi L302 L303 1_ _301 470_1 4W 5WI 36 ...

Page 37: ...EXPLANATION FOR MICOM CIRCUIT 2 PWB parts diagram and list 2 1 PWB Assembly main part diagram 1 GR G277STSA LSC27990TT 37 ...

Page 38: ...EXPLANATION FOR MICOM CIRCUIT 2 2 Parts list 1 GR G277STSA LSC27990TT 38 ...

Page 39: ...EXPLANATION FOR MICOM CIRCUIT _e 4a zo _3OOT _ EAT S_ _47 7Z_O304_ _ 39 ...

Page 40: ...17818TR SOT223 EA 22 A01110062 MEMORY SDRAM HYNIX SAMSUNG ItY57V561620CT H K48561632C TC75 EA 2 23 A01110081 MEMORY NOR FLASH ST M29W800DB70N6 TSOP48 EA 24 A01110084 MEMORY NAND FLASH SAMSUNG K9F1G08UOM PCB0 SOP48 EA 25 A01140017 ZVS CCFL CON ROLLER BI ECR BIT 3105 SSOP20 EA 26 A01140025 RS 232 IN ERSIL HIN213ECAZ T Pbfree EA 27 AO1150055 TOUCH SENSOR AD_qEXll 1801 SSOI6 EA 8 28 A02010001 Reslstor...

Page 41: ..._ _tlP tm_x_ 0603 _7nF 0603 CI10B473KA8NNNC EA 3 78 A0304102 _x_lBt_x_ 0603 _00nF 0603 CL10FI04ZA8NNNC EA 42 79 A03041022 _xtlal_xt 0805 100nF 0805 CI10F104ZO8NNNC EA 1 80 A03042001 _ _lP I_xt 0603 luF 0603 CL10B223KB8NNNC EA 14 81 A03042012 b_xll al _ _ xt 1206 TDK 10uF 1206 16V Y5V C32 6Y5VIC106Z EA 2 82 A03042013 _xllP _ _xt 1206 DK 4 7uF 1206 25V Y5V C3216Y5V1E476Z EA 1 83 A04010001 rrJul 3FR6...

Page 42: ...ag RAM m _ BUS CeNT Arbiter Decode A H B C Interrupt CeNT B _ Power Mabagement U s C C Memory CONT __ SRAM NOR SDRAM _ Clock Generator MPLL U PLL A H B d b C C LCD LCD CeNT DMA C C USBHOSTCONT ExtMaster NAND CONT NAND Flash Boot Loader Clock Generator MPLL UPLL UART0 1 2 _ _ USB Device SDI MMC _ Watchdog _ _ Timer BUS CONT _ Arbiter Decode J sP Ol _ B U S 120 12S GPIO 1M BOOT ROM NOR FLASH 64M SDR...

Page 43: ...EXPLANATION FOR MICOM CIRCUIT 3 PWB Circuit Diagram may vary by model 1 GR G277STSA LSC27990TT _T _w C EO p m O_ 272 U3 0 43 ...

Page 44: ...EXPLANATION FOR MICOM CIRCUIT _ 2_ _ T_ T T s _ s_ _m DI_ L GWT ore sin i 44 ...

Page 45: ...the ice bin is full Performs Ice Making Mode after supplying water by operating the SOLENOID in ICE VALVE With the detect lever checks if the ICE BIN is full To operate LINE and SERVICE press and hold the Fill Key for 3 seconds The icemaker will run through 3 stages Harvest _ Fill _ Icemaking 1 Turning the Icemaker stop switch off 0 stops the ice making function 2 Setting the Icemaker switch to OF...

Page 46: ...es 19 F 7 C 1 4 hours after starting 4 If the temperature sensor is defective the ice making function will be completed in 4 hours NOTE After Icemaker Power is ON the Icemaker heater will be on for test for 9 sec 2 3 Harvest Mode 1 Harvest Ice removing refers to the operation of dropping cubes into the ice bin from the tray when icemaking has completed 2 Harvest mode 1 The Heater is ON for 30 seco...

Page 47: ...e pre test setting Diagnosis TABLE STAGE ITEMS INDICATOR REMARKS Five seconds after heater starts a 1 HEATER heater will go off if the temperature by sensor is higher than 20 C Five seconds after heater starts you 2 MOTOR can confirm that a motor is moving HALL IC I _ After the icemaker detects that ice has been 3 detection of _ made the motor and heater are off but on position standby until the c...

Page 48: ...R DOOR OPEN PERCEPTION HEATER SHEET_ DAMPER PWB ASSEMBLY DISPLAY DISPENSER LIGHT WATER TANK SENSOR _ AMBIENT SENSOR _ I_0_A_ TS_ CON1 __ YL CON3 CON8 DON4 _DON_ CON5 BL N RD CON2 CON6 FUSE t00 127V I220 240V NO FUSE 250VAC 15A GY BK BN BL N BL WN PR UL YL SS PR BN GY PIPE HEATER BL N eL N i DISP HEATER BL N DF_DOOR SWITCH D F LAMP _ BL N FS_b_C I BL N AUGER MOTOR DISPENSER SOLENOID CUBE WATER BL N...

Page 49: ...s of OLPis bad Badconnection Poweris disconnected InnerNi Crwireblowsout Badinternal connection Faultyterminalcaulking Cuwireis cut Badsoldering No electricpower oncompressor Faultycompressor Faulty PTC Powerdoesnotconduct Damage Badcharacteristics Initialresistance is high Badconnection with FTcoloose compressor LAssemblyis notpossible Badterminalconnection 4 During defrost FStart automatic defro...

Page 50: ...ansportation inpipes Duringwork Air blowing FNotperformed Performed Tooshorttime Lowairpressure Lessdryair Moisture penetration Leaveitintheair Moisture penetration intotherefrigeration oil Weldjoint clogged Shortpipeinsert Pipegaps FToolarge LDamaged pipes Toomuchsolder Drierclogging Thecapillary tube inserted depth Toomuch Capillary tubemelts Overheat Clogged withforeignmaterials _ Desiccant pow...

Page 51: ...nmaterials Adiabatics lumpinput i penetration Damagebya screwor clamp i Otherforeignmaterials input Capdrainisnotdisconnected _ Plate i Wireiscut i Heatingwire Contactpoint betweenheating andelectricwire Dentbyfin evaporator Poor terminal contacts Wireis cut Leadwire Heatingwire Contactpoint betweenheatingand electricwire Heating wireiscorroded i penetration Water Badterminal connection Check visu...

Page 52: ...stdoes notreturn 3 Cooling air leak Badgasket adhestion r Gap Badattachment u Contraction Doorsag Badadhesion w Weakbindingforceathinge 4 No cooling air circulation Faultyfan motor Fanmotor Selflocked Wireiscut Badterminalcontact Doorswitch Faults Contactdistance Buttonpressure Meltedcontact Contact Refrigerator andfreezerswitchreversed Buttonis not pressed Poordoor attachment Doorliner dimension ...

Page 53: ...misuse Smallcapacity Lowvaitage 6 Refrigerant Malfunction of charging cylinder too much or too little _ Wrongsettingof refrigerant L Insufficient compressor Faultycompressor 7 Continuous operation No contact of temperature controller Foreign materials 8 Damper opens continuously Foreign materials Adiabatics liquiddump jammed TheEPS styrofoam _R driptrayhassedimentin it A screworotherforeignmateria...

Page 54: ...mbienttemperature Insufficient spacearoundrefrigertor 5 Refrigerant leak 6 Inadequate of refrigerant 7 Weak compressor discharging power _ Different rating Smallcapacity 8 Fan does not work 9 Button is set at strong 1 Ice in freeezer compartment External airinflow Bushing installed incorrectly Dooropens Weakdoorclosingpower butnotcloses Stoppermalfunction Doorsag Foodhindersdoorclosing Gaparoundga...

Page 55: ...on in the refrigerator compartment Defrosted water overflows Clogged discharging hose Discharging hose Evaporation tray located at wrong place location Tray drip Damaged Breaks holes Small Capacity 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 Sto...

Page 56: ...ds from fan Fanguidecontact contact Shroudburrcontact Dampingevaporator contact Residual frostcontact Damagedheatercord T Narrowevaporator interval Unbalance fan sounds_ Unbalance Surfacemachiningconditions Fandistortion Misshappen Burr Iceonthefan Air intake opposite to motor bushing assembl_ Motor shaft _ Supporter disorted contact sounds _ Jiltedduringmotorassembly Resonance Evaporator noise Ev...

Page 57: ...istance 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 term...

Page 58: ...ted Poor flatness Nowasher No grease Malfunction _ NotclosedInterference betweendoorlinerandinnerliner Refrigerator Stopperwornout compartment is openedwhenfreezer compartment is closed faultystopper 2 Odor Temperature of High refrigerator compartment Deodorizer _ Nodeodorizer Poorcapacity Badfreezercompartment door assembly No stopper _ aultydampercontrol Buttonis setatweak Doorisopen something i...

Page 59: ... _o _ u U 0 o o _D_ o o o o_ 0 o_ o Z o o_ _ _ _ z_ d 0 _ _ _ ___ o__ c o _ i E _ o cc _ o8_o _o_ 0 J _ a _ z _ o _ _ _ _ _ 0 o9 0 o co ii E 0 n 0 0 o o o o _ Z _ z _ _ c _ _ d d J a o _ d o __ o o_ _ rr rr _ o o o N 13 U _ J o2_ o _ o s F_ _ _ o 0 JO o J_ o jo J E o 0 z oo_ o o_ 09 oOX 3 _ o 59 ...

Page 60: ... _ o _ _ 1 _z_o 05 O _ N 0 u_ o N u_ 0 I I o 5 o o o o _ el 3 O _ 0 D 0 0 O rr r7 r7 4 O O_ d o _ 0 N _o_o_ _ o 13 LL 13 a O o q d oo E _ D o LL CO q _ D O3 q _ __ _ _ _ E _ _OE_ _ _ 5 o _ _ _ _ 5 oo _ o_ o o o _o _ rr rr _ d _ 8 __ J _ 0 _ _ _ E_ o 2_ o g 5 __o d o 13_ _ _ _ s o 60 ...

Page 61: ...TROUBLE DIAGNOSIS 6 1 03 O _3 1 E E 5 o Q O o q o E C3 o gr2 _ o E _ C _ _ _ _ _ _ _ _ __ __ _ _ o o o N _ 0 CO q d 0 _ _ 0 _ 0 o _ 8 gz_ zz 0 cd d d G 6 o_ o zz aO _ _ 8 61 ...

Page 62: ...OSIS I O o O 8 o o Q_ o _Q E _ C E 13 w _ _ _ _ __ o o _J c _ 09 0 0 0 o o E o o _3 o d 0 0 rr o _ _ o m x o c_ _ E w o c O9 0 0 o _ o 0 0 o o 69 o o_ o 0 I 0 0 E o o o ed _9 _9 o O_ E o o o o o E _x _ E _ o u_ o 62 ...

Page 63: ... _ o o_ o o_ _o o _ o _ _o _ _ _ _0 _ _ _ _ o _ _ _ _ 5 _ 00 _ __ o _ _ _ _ __ q _ _ co _ o o _ 0_ o _ X_ _ _ _ _ m o m _ m 0 _ a _5 q_ o c _ J z _ _ Xo_g _ c a o o q_ o m ed c c c a _ _ _ _ o 0 o O3 0 a o o q_ o c o J v D D o D D I do_ _ rr o o u_ _ _ _ o _ __ _ _ _ _ o o B _ In II N o o_ c_ co o q JO 0 Z 63 ...

Page 64: ... o c r_ c 03 E E _ c w U_ i co c 1 c 8 _ __ _ rn c m _ _ o E c c o 0 _ _ D _g _ o_ _ _ o _ 8 i o o 8 _ o _ E o _ _ _ _ _ 09 _ O3 o _ d _ __ o _ _ _ o _o _ __ __o_o _ __ _ _ o o_ o3 _ _ __ __ _ _ _ _ _ _ o _ c _ 0 _ _ c o3 o o Z 64 ...

Page 65: ... _ _0 o o o o o o o _ Q w 0 09 e5 o _ _ _ __ _ Q_ _o_5o _ 0 0 o__ _o _ _ _o o _ o o o o o o o _ o E to 0 o o e5 o r_ o E e5 _ _ 0 E 02 _ e5 _ o ov e5 Oo _ o o __ Eo _ o _ ___ _ _ g_ _ o_ o L_ L_ 0 0 L_ 0 L_ _ O O_ C o o_ o _ o _ _ o _ E oo o 0 09 _ O_ o8 _ _z o 09 o 09 _ o o o CO I 0 0 0 E o_ o o o E o o o o _0 _ _ o _ o o o _ gz _ 0 G 0 E E z __ d z o n o _ _ 65 ...

Page 66: ...u O _ V5 O __ _ _ _ _ i _ _ _ _ _ _ __ _ O _ O O u O N D o o _ uo _ _ _ _o_ ooo_ _ o o N _ o o o E 09 09 e5 _ o _ o u o _ o O o O 8 o E E e5 E o _ _ U U e l o E _ _ o O E _ O_ _ _ d 5 8_ _ _ _ o _ __ o_ _ S_ o _ _ _ _ N _2 o8_ _q o_ o 25s o _ o O o 0 __ _ o __ c_ r u_ o w o Cl3 O O D _5 O O O _ O O D 2 o o 0 0 d o _ _ w _ u _ O E o M D_ o o E 66 ...

Page 67: ...oo 09 09 o O_ E o o _6 o c t_ o o 09 05 o J o o c o o c o o _o_o c w _ m o o _ c o_ _5 o o N 0 o o_ o 0 o _ o o E oo E c o o E m o _ _ o __ _ _ _ o _ _z 0 o 03 _ co 0 0 o co 0 0 D co D co D 4 O _ O O O _c r7 4 CO _l co 5 5 05 U O o o c w o c o 03 o c o E o o_ c E e5 o Ll O 4 c o o9 d o o _ _ 0 _ 09 7 04 03 0 c c E c _ o E c o o o o5 o 09 o_ o o_ u_ 67 ...

Page 68: ... s _ _ o o o 03 C 09 CO _ _ _S o_O o _ o o _ co v _ _ o _ o _ s _ _ o _ _ o S _ _ sO E t o _ 4 _ o o E _ o D c C w d o O o _ N _ N_ _ o o _ O s z N 05 _ _4 d _ _o 0 o _ S __ _ o _ o _ _ o 03 0 o o E o o 8S 7 _ 0 _8 o D X _ D _ _ _ d o 68 ...

Page 69: ..._D _ 03 _ _ __ ___ _ _ _ __ _ o _ o _ _ C O_ _ _ c _3 c 0 0 __ 0 _ 0 o o c C7 D c E _ o 0_ X b b E E 0 0 o o D D 0 0 0 0 o_ o_ _ E_ E o _ o O O _D c N C _ _ O O O N _ _ 3 O3 C O C O X b g_ o o n C O O9 CD D c _ __ o co o O O o Q _3 _c o 0 j _ O3 O _ _ _ O 0 2_ O O O O _ O 00 _ 69 ...

Page 70: ..._ _ _ _6 o D _o D _ _8 _ J d q _ _ _ _ _ o O o 09 o o _ _ oE _ d _ _ o o O _53 CO _ O O CO CO O 0 13 _ 0 0 J J_ _ J 2 0 E d o o u_ o o o o u_ o o9 o x E Q o o Q o o9 o Q_ o _ co N _ E o co Y_ N _ _ 0 _BZ d _ r r o o N O O 5 2_ gr2 N 0 0 E o E _ 0 70 ...

Page 71: ... o _ _ _ _ _ _ __o 0 0 r_ 13_ o c _ _ _ X D 0 D o 6 co 13_ P D D 0 0 D D r_ r r _ c 5 o U _ 13 0 co _ _ _ _ _ 0 _ 0 _ 0 0 0 D CO o v o rn 0 E _ _ 0 t _ _n rr E o_y o s _2 _ _ _ _SSoS 09 c o gr2 0 3 0 _ o o _ S o _ m 5 o 52 __ _ r _ _ o 0 _ 0 c c _ o 03 Cl3 _Q _ C3 ao 2 o ___ _ o 5 o o c _ _ _ X 0 rr O_ _ __I_ c_ g _ _c _ _ _ _ o 0 _ c_ _ c_ E J D 0 D c_ J D 71 ...

Page 72: ... E o O c _ _ X O C _ O _ _ o_ _ O _ _ _ CO N D O O rr m NI o D C _ NI CC _ o o c N D D U o D 0_ c o x 13_ rr _ o O O3 O _ c E E x o _ _ E _ _ o o o o o L_ o _ _a _ _ o _ ___5 _ _ _ __ o _ _ _ m c o _ _ _ _ cd 0 o_ _ _o_ _ _ 0 0 O _ _ c o _ _ a _ a _ a _ _ _ o_ _ L_ 0_ N D D 0 E o o _ d 0 0 cc _ _ o O3 O _ _ O N c cc _ J u_ c O o C0 72 ...

Page 73: ...O u o C3 O _ _ _ O E pr _ o E Y o 7 o _ _ _ N c_ o el O3 E __ n Q_ E O c O0 _ o_ _ _ _ _ ___ _ _ P E E _ _ __ __ _ _ 03 N _o __ _ _ _ o _ _ ___ CC _ _2 O3 _ P O Q c O E c o o _ rn O _ c o _ o _ o o _ o_ O __ _ o m _ m _ o o o _ c oo 0 o 73 ...

Page 74: ..._ _ 0 _ _ _ _ _ _ o o 0 0 03 0 0 03 03 0 03 0 o _3 03 0 _ zz _3 03 0 03 0 o o 0 0 0 m _3 0 03 o 03 _ o E o o Cl3 _J _ 2 o _ _ _ N _ 03 _ 03 0 _ _ 0 0 _ 0 _ _D N N o __ _ _ _ X rr _ o_ o __ _ 8_ _ N _ _ 03 o o 0 _5 E _ o _ _ _ _ _ o 0 52_ _ _ _ E _ _ _ 03 03 0 _D 03 D 0 _D 0 0 03 E E 03 03 o _D 03 03 0 o _ 03 _ o 74 ...

Page 75: ...2 0 o o _ o O cc E _ o g g _ _ _ N o o _ _ _ 2 _ _ o _ _ N _ _ _ o _ _ o N N rn o C3 d o o _ P 0 _ _ 0 0 _ _ _ _ _ _ o o E o _ o ___ _o oo _ I D _ I D I D n n n P_ D U q o D 0 rr kO rr rr v o _ z o o _ o _ m m o o o rr _ _2 _2 m _ m o o o o o O O O o _ _ d _ D D g E_g o O9 _5 O _g_ _ _ O O _ O D 0 O_ D O D O 75 ...

Page 76: ...ts 6 Drier replacement Leak check Vacuum Torr Below 0 03 ref Note Only applicable to the model degree equipped with reverse flow protect plate Vacuum EA High and low Vaccum efficiency can be improved by Pressure sides are operating compressor during evacuation evacuated at the same time for models above 200j_ Vacuum EA Use R134a To protect The bushing pipes for R12 refrigerant will piping exclusiv...

Page 77: ...le compressor operates Weld carefully after pinching off the inlet pipe Check leak at weld joints _ Minute leak Use electronic leak detector Big leak Check visually Note Do not use soapy water for check Check cooling capacity _1Check radiator manually to see if warm 12 Check hot line pipe manually to see if warm 3 Check frost formation on the whole surface of the evaporator Remove flux from the si...

Page 78: ...NT TO OPEN THE SYSTEM IN THIS ORDER 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 Evaporator 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 w...

Page 79: ...iercing type valves will allow future servicing and eliminates the possibility of a defective pinch off Evaporator j o Jne _ _ _ Drier _ I High pressure side R 2_ Condenser Intake KEY POINT Welding without nitrogen blowing produces oxidized scales inside a pipe which affect performance and reliability of a product When replacing a drier Weld _ and _ parts by blowing nitrogen 0 1 0 2kg cm2 to high ...

Page 80: ...rigerant supplied to each model after completing vacuum degassing 2 Evacuate charging canister with a vacuum pump 3 Measure the amount of refrigerant charged Measure the weight of an evacuated charging canister with an electronic scale Charge refrigerant into a charging canister and measure the weight Calculate the weight of refrigerant charged into the charging canister by subtracting the weight ...

Page 81: ...efore closing the cover of the mechanical area Bushing 3 5 Standard Regulations For Heavy Repair 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 an...

Page 82: ...Copper Brazing Copper Brazing TUBE DRIERASSEMBLY SUCTION PIPEASSEMBLY Copper Brazing HOT LINE PIPE ASSEMBLY Freezer Copper Brazing Silver Brazing Copper Brazing Copper Brazing JOINTPIPE ASSEMBLY Coppper Brazing WlRE CONDENSER ASSEMBLY Silver Brazing 82 ...

Page 83: ...when pipes and internal 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 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 T...

Page 84: ... is supplied the water supply valve in the machine room makes sounds like Hiss and water flowing also makes sound When water 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 Explain the principles of water supplied to dispenser When the water supply button in the dispens...

Page 85: ...orage location If water is kept in the door rack move it to a refrigerator shelf It will then become cooler Explain the characteristics 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 Check the position of temperature con...

Page 86: ...e is set at MID If hot air comes into the refrigerator fine frost forms as cold air mixes with hot air If this happens quite often much frost forms inside of the refrigerator If the door is left open in Summer ice may form inside of the refrigerator Explain basic principles of frost formation When ice tray with full of water is put into a freezer compartment the water evaporates If cool air fan op...

Page 87: ...how to store foods Condensation forms when refrigerator is installed at damp area door is frequently opened and wet foods are not stored in the air tight container or wrapped Be sure to store wet foods in airtight containers or securely covered in plastic wrap When should the power be connected You can connect the power immediately after installation However if the refrigerator was laid flat befor...

Page 88: ...tes 1 When inserting the instrument or circuit board fix the leads to the jack before soldering 2 Insert higher voltage resistors with a 10mm gap above the PWB 3 Don t touch hot chassis leads 2 FEATURE 2 1 Auto Program tuning All stations that can be received are stored 2 2 Auto Sleep TV will automatically switch itself to standby mode approximately ten minutes after TV station stops broadcasting ...

Page 89: ...TV RADIO 3 CONTROLS Antenna Jack MENU MENU OK OK CH PR VOL TV AV RADIO POWER T TV AV RADIO VOLUME Remote Control Sensor POWER 89 ...

Page 90: ... Selects MTS sound Mono Stereo and SAP MENU Activates the on screen menu tog gles through the menus and toggles through preset radio station OK CHANNEL VOLUME I_ PSM Adjusts the factory preset picture according to the room SLEEP Lets you select the amount of time before your TV turns itself off auto matically FLASHBK Press the FLASHBK button to return to the last channel you were watch ing Open th...

Page 91: ...3 Change the TV Main PCB 2 Poor Radiant heat 1 Fan turning abrades wire and tape 1 Detach Fan and remove the Fan interference 2 Poor Fan 2 Change the Fan 3 No TV broadcast 1 No TV connection 1 Check connection and switch on Hinge Cover Back TV 4 Button does not 1 No P105 connector 1 Check connector and switch on work 2 Poor switch 2 Change the Button PCB 5 Remote Control 1 No P105 connector 1 Chec...

Page 92: ...TV RADIO 6 BLOCK DIAGRAM 0 0 _ O J no_ j_J nO_ _J_J Z j 0 W Z z 0 i a 92 ...

Page 93: ...e soft plastic from damage 2 or 3 layers is recommended Using a flat bladed screwdriver carefully pry the trim loose from the frame Carefully remove the trim 0 Remove two phillips head screws located at the top of the TV Tip the TV forward and disconnect all wires Carefully remove the TV 93 ...

Page 94: ...tion until it is loosened and take it out in arrow _ direction Him e Lever 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 _ direction Be careful because the door may fall damaging the door the floor or injuring you 4 Lift up the freezer door _ in arrow direction and dis...

Page 95: ... Disconnect electrical connector A and remove the upper fan grille 4 Hold the upper part of the lower fan grille and pull it forward carefully 5 Loosen two screws 6 Disconnect electrical connector B on the back fan housing Use a screwdriver blade to remove the 2 rails and the fan housing 7 Pull the fan housing out from the top 8 Check the adhesive foam on the upper and lower fan grilles If it is d...

Page 96: ...separate the tube Collet Tube Insert Line Clip 5 FAN AND FAN MOTOR DISASSEMBLY METHOD 1 Using a short screwdriver loosen one SCREW in DRAIN PIPE ASSEMBLY and one connected to the MOTOR COVER DRAIN PIPE ASSEBLY MOTOR COVER e 3 Turn off the water Then separate the water line from the valve 2 Pull and separate the FAN ASSEMBLY and MOTOR turning counterclockwise based on the MOTOR SHAFT FANASSEMBLY MO...

Page 97: ... with a hook 3 The display assembly can be connected by pressing the top of the dispenser cover and pushing it after separating the display frame from its housing 5 The duct cap assembly can be disconnected if the hold lever connecting screw is loosened with a phillips driver Solenoid Assembly Holder Lever a i Duct Cap Assembly 6 To install the duct cap assembly insert one end of the spring into t...

Page 98: ...EMBLY DISPLAY I FUNNEL ASSEMBLY 8 I MICRO SWITCH 9 I FRAME FUNNEL 10 I LEVER SWITCH 11 I FUNNEL 121 BUTTON LEVER 131 HOLLDER BUTTON 14 I SOLENOID ASSEMBLY 151 SPRING 161 LEVER HOLDER 17 I CAP ASSEMBLY DUCT 181 CAP DUCT 19 I DISPENSER LEVER 201 FOAM NEW 21 I RUBBER CAP 221 DECO DRAIN 231 CAP COVER NOTE Not every model includes every option 98 ...

Page 99: ...EXPLODED VIEW FREEZER DOOR PART GR G277STSA LSC27990TT Optional part 1 _o_ 99 ...

Page 100: ...EXPLODED VIEW REFRIGERATOR DOOR PART GR G277STSA LSC27990TT Optional part r 1 l 100 ...

Page 101: ...EXPLODED VIEW REFRIGERATOR COMPARTMENT GR G277STSA LSC27990TT 9 Optional part 101 ...

Page 102: ...EXPLODED VIEW REFRIGERATOR COMPARTMENT GR G277STSA LSC27990TT Optional part 152A I I 102 ...

Page 103: ...EXPLODED VIEW MACHINE COMPARTMENT GR G277STSA LSC27990TT Optional part 104A I I I I I 103 ...

Page 104: ...EXPLODED VIEW DISPENSER PART GR G277STSA LSC27990TT Optional part J _ _ I 104 ...

Page 105: ...EXPLODED VIEW TV PART GR G277STSA LSC27990TT s S Analog TV 105 ...

Page 106: ...O LG Electr n_ s in P No 3828JD8985A JAN 2006 Printed in Korea ...

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