LG GC-B197HWL Service Manual Download Page 7

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Parts Defect Determination in Power On Status

Parts Defect Determination in Power On Status
Check of Power Application

-Check that supply power of +15V, +8V used as supply power of digital circuits is normally applied.

COMPRESSOR

+15V

+8v

Measuring part D202 Pin2-GND

D203 Pin2-GND

Normal

13V-15.5V

7V-9V

Defect

13V or less

7V or less

Measures

Replace board

-7-

Summary of Contents for GC-B197HWL

Page 1: ...CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK BEFORE CHECKING OR OPERATING THE REFRIGERATOR REFRIGERATOR SERVICE MANUAL http biz lg vice com r e s SALES MODEL GC B207GLQV ...

Page 2: ... S I L D N A G N I W A R D S T R A P B W P 2 3 T I U C R I C 1 9 3 53 S I S O N G A I D E L B U O R T 2 6 3 5 G N I T O O H S E L B U O R T 9 7 3 6 S T L U A F 6 8 0 8 R I A P E R Y V A E H E L C Y C G N I L O O C 1 9 7 8 S M I A L C H T I W L A E D O T W O H HOW TO DISASSEMBLE AND ASSEMBLE 92 93 DOOR 92 HANDLE 93 EXPLODED VIEW 94 98 CONTENTS 2 COMPRESSOR 4 7 8 13 Heavy Repair Method of Refrigerat...

Page 3: ...em 7 Make sure the hook is correctly engaged Remove dust and foreign materials from the housing and connecting parts 8 Do not fray damage machine heavily bend pull out or twist the power cord 9 Please check the evidence of moisture intrusion in the electrical components Replace the parts or mask it with insulation tapes if moisture intrusion was confirmed 10 Do not touch the icemaker with hands or...

Page 4: ...m connection contact or CON201 Housing contact short circuit of harness Where resistance values measured at A point are also shown as infinite or several hundred disassemble a cover PTC of the compressor terminal and check the terminal connecting status at the B point in Figure Where there is no failure in the wiring status and resistance values are shown as infinite or several hundred it may be d...

Page 5: ...ip To protect the compressor from abnormal operation this logic is used to temporally stop the refrigerator when abnormal operation occurs and to re operate it after abnormal signal disappears COMPRESSOR Division operation condition Delay time LED time Stroke Trip Stroke 16 8mm 1mintue 2times Current Trip Running Cap voltage voltage Vcap 540Vrms 59 5Hz 1 82Arms 61Hz 1 86Arms 6 mintues 6times Lock ...

Page 6: ... additionally check it with a multi test check for short Bridge Diode Inspection Bridge diode is considered as destroyed if value of10W or less is shown in every case when measuring resistance with a multi test for 2 terminals of4 diode terminals Power should be turned on again after checking all parts because series of detects may occur when powering on in a simple parts defect status for parts d...

Page 7: ...On Status Check of Power Application Check that supply power of 15V 8V used as supply power of digital circuits is normally applied COMPRESSOR 15V 8v Measuring part D202 Pin2 GND D203 Pin2 GND Normal 13V 15 5V 7V 9V Defect 13V or less 7V or less Measures Replace board Replace board 7 ...

Page 8: ... pressure side COMP capacity of the refrigerator using R609a as refrigerant is large by 1 7 times than that of the refrigerator using R134a Labels as in Figure are displayed at the compressor of a refrigerant for R600a and the back plate of refrigerator 1 4 Location and Environment for Heavy Repair Check that drafting and air ventilation are well done at a working area and perform work after makin...

Page 9: ...ve Leave doors of a refrigerator so that they are not closed Connect pinch pliers with a refrigerant discharging hose Place the outlet of a refrigerant discharging hose outside Remove fire appliances or heating sources near a refrigerant discharging hose Always use a refrigerant returnbag for working at the contained space Bore the charging pipe of a compressor with pinch pliers Remove fire applia...

Page 10: ...igerant remained in the pipe Vacuum working time should be for more than 10 minutes 2 3 Welding Repair Step Required equipment Simple welding machine Remove pinch pliers if remaining refrigerant returnis completed Cut the front part of a process pipe with a cutter Check that remaining refrigerant comes out Perform welding work such as replacement of compressor and dryer or repair of leakage part B...

Page 11: ...en connect a charging tube with welding 2 5 Vacuum Air Removal Required equipment Vacuum pump Connect a vacuum pump to a charging tube to perform vacuum cycle Vacuum work should be performed for an hour If vacuum time is short normal cooling performance may not be exerted due to failure of cooling cycle Heavy Repair Method of Refrigerator by Application of Refrigerant 11 ...

Page 12: ... after 5 through 10 minutes to check remainedrefrigerant quantity to complete charging of refrigerant After charging refrigerant never perform welding work or work using fire appliances 2 7 Leak Inspection and Cycle Check Required equipment Leakage checking machine foam and leakage inspection machine Check for leakage by using form or a leakage inspection machine at the worked part if charging of ...

Page 13: ...2 8 Failure Checking Procedures Heavy Repair Method of Refrigerator by Application of Refrigerant 13 ...

Page 14: ... C T P R O T A R O P A V E e p y T e b u T n i F CONDENSER Wire Condenser REFRIGERANT R600a 80g L I O G N I T A C I R B U L FREOL 10G 310 cc DRIER 3 8 0 D I w e i V t n o r F w e i V e n a l P c e p s l e d o M 3 S M E T I S N O I T A C I F I C E P S E B U T Y R A L L I P A C MOLECULAR SIEVE XH 7 T S O R F E D T S R I F 4 5 Hours E L C Y C T S O R F E D 13 15 Hours E C I V E D G N I T S O R F E D ...

Page 15: ...PARTS IDENTIFICATION 15 Frame Display Cover PWB o N f e R 2 ...

Page 16: ...orizontal Insert a driver into the groove of adjusting screw and rotate driver in arrow direction clockwise until the refrigerator becomes horizontal HOW TO INSTALL REFRIGER ATOR 16 1 1 2 2 Adjusting Adjusting r e v i r D r e v i r D Even if the height can not be aligned by using the height adjustment screw insert the transparent sheet supplied with the product Bot t e k c a r b m o t s n a r T pa...

Page 17: ...rigerator compartments shall not be indicate in the standard model GC A217L when refrigerator or home bar door is closed Divisio Initially On n Power 1st Press 2nd Press 3th Press 4th Press 7th Press 8th Press 9th Press 10th Press 11th Press 19 C 4 C 19 C 4 C 20 C 3 C 21 C 2 C 22 C 1 C 23 C 7 C 15 C 4 C 16 C 3 C 17 C 2 C 18 C 1 C 19 C 7 C 20 C 3 C 21 C 2 C 22 C 1 C 23 C 7 C 15 C 4 C 16 C 3 C 17 C ...

Page 18: ... sound 2 5 Buzzer alarm of forced start and forced defrost 1 Press the test button on the main PWB for a Beep sound 2 When forced start is selected the alarm sounds 3 times on for 0 2 second and off for 1 8 second 3 When forced defrost is selected the alarm sounds 3 times in the following cycle 0 2 sec on 0 2 sec off 0 2 sec on 0 2 sec off 0 2 sec on 1 0 sec off 2 6 Defrost function 1 Under normal...

Page 19: ...ON F FAN C FAN ON DAMPER OPEN 0 6s 60s Damper Heater ON COMP ON 0 3s Valve Initial 0 5s Valve Open 60s 0 3s POWER ON F FAN C FAN ON DAMPER OPEN 0 6s 60s Damper Heater ON COMP ON 0 3s Valve Initial 0 5s Valve Open 60s 0 3s POWER ON Defrost Heater ON 0 3s 10s DC Heater ON F FAN C FAN ON 5s Defrost Heater OFF H Bar Heater ON 0 3s 5s H Bar Heater OFF 5s DAMPER OPEN 60s COMP ON Valve Initial 0 5s Valve...

Page 20: ...rring energy of the primary side of the switching terminal to the secondary side and the feedback part IC3 IC4 transferring it to the primary side Caution Since high voltage DC310V is maintained at the power terminal please take a measure after more than 3 minutes have passed after removing power cords in the abnormal operation of a circuit Voltage of every part is as follows EXPLATION FOR MICOM C...

Page 21: ...no operation is done 1 3 Reset circuit The reset circuit is circuit allowing various parts such as RAM inside of MICOM IC1 to initialize and the whole of function to start from the initial status when initial power is input or when power is applied again to MICOM by a spontaneous power failure LOW voltage is applied to the reset terminal of MICOM in the beginning of power supply for a constant tim...

Page 22: ...door switch of the cold storage room fails to sense the door open switch C D or the home bar switch EXPLATION FOR MICOM CIRCUIT 22 Closing 5 V C D S W at both ends are at Off status Opening 5 V C D S W at both ends are at On status Measuring part IC1 MICOM No 45 Pin Door of Freezing Cold Storage Room ...

Page 23: ...re in ice making or an evaporator for sensing temperature of a frost removal sensor necessary for frost removal Short or open status of every temperature sensor is as follows EXPLATION FOR MICOM CIRCUIT 23 SENSOR CHECK POINT NORMAL 30 C 50 C IN SHORT IN OPEN Freezing sensor POINT A Voltage Frost removal sensor POINT B Voltage Cold storage sensor 1 POINT C Voltage 0 5 V 4 5 V 0 V 5 V Cold storage s...

Page 24: ...y circuit The following circuits are entry circuits for sensing signal form test S W electronic single motor damper reed S W for examining refrigerator GC B207G A207G EXPLATION FOR MICOM CIRCUIT 24 47 P46 R26 CC11 223 ...

Page 25: ...f MICOM PIN 33 34 and 35 as shown in wave form of the following part These signals are output to the output terminal No 10 11 14 15 via the input terminal No 3 6 8 of the IC10 TA7774P as IC for motor driving Output signals allow motor coils wound on each phase of stator to form rotation magnetic field and the motor to rotate Inputting as below figure to the input terminal INA INB as IC TA7774AP fo...

Page 26: ... fan motor OFF 2 This is a circuit to perform a temporary change of speed for the fan motor and applies DC voltage up to 7 5V 16V to motor 3 This circuit performs function not to drive the fan motor further by cutting off power applied to the fan motor in the lock of fan motor by sensing the operation RPM of the fan motor GC B207G A207G EXPLATION FOR MICOM CIRCUIT 26 ...

Page 27: ... FOR MICOM CIRCUIT 27 Compensation Compensation for weak cold for over cold Temperature compensation value Remarks JCR3 JCR4 JCR1 JCR2 at cold storage room 0 C In shipment from factory CUT 1 C CUT 1 C CUT 1 C CUT 1 C CUT CUT 2 C CUT CUT 2 C CUT CUT 0 C CUT CUT 0 C CUT CUT 0 C CUT CUT 0 C CUT CUT CUT 1 C CUT CUT CUT 1 C CUT CUT CUT CUT 0 C Temperature compensation in CUT JCR1 1 C 2 C JCR2 1 C JCR3 ...

Page 28: ... of main PCB and LCD dedicated MICOM for LCD control of display PCB Transmission receipt L Wire together with the necessary display PCB for driving the display PCB is required 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 EXPLATION FOR MICOM CIRCUIT 28 ...

Page 29: ...ance of the cold storage sensor 1 and 2 shall be measured with a digital tester after separating CON8 of the PWB ASSY and the MAIN part u Resistance of the freezing sensor shall be measured with a digital tester after separating CON7 of the PWB ASSY and the MAIN part EXPLATION FOR MICOM CIRCUIT 29 Measuring Temperature C Freezing Sensor Cold storage sensor 1 2 Frost removal sensor Outside sensor 2...

Page 30: ... 30 3 PWB Parts Drawings and List 3 1 PWB Assembly Main Parts Drawings EXPLATION FOR MICOM CIRCUIT ...

Page 31: ... 31 EXPLATION FOR MICOM CIRCUIT ...

Page 32: ...CIRCUIT 32 ...

Page 33: ...sor Open or short 6 Defrost abnormal dH E D sensor still below 5 after defrost heater on 80m Fuse M open Def Heater open or Relay of def heater badness 7 F Fan abnormal FF E When Fan should be on Main PCB can not receive the feed back signal in 65s Fan lead wire badness Fan drive IC badness 8 C Fan abnormal CF E 9 Communication error CO E Communication between Main and display abnormal Lead wire M...

Page 34: ...ironment temp measure Disp F 除霜 R1 R2 RT NO Error mode Load Control COMP F FAN C FAN Def Heater Damper 1 Normal 2 FS E 15m ON 15m OFF Standard RPM 3 rS E Standard RPM 10m OPEN 15m CLOSE 4 r2 E 5 dS E Standard RPM No Defrost exit immediately 6 rt E No RT compensate 7 dH E Standard RPM 8 FF E OFF Recheck after 30m 9 CF E OFF Recheck after 30m 10 CO E Standard RPM Note means control normally 34 ...

Page 35: ...rror Is the connection loose CON8 If the same situation appears replace main PCB Otherwise explain to the custom er 换F_Sensor No Main PCB WH WH F Sensor CON8 23 24 Wiring diagram Yes Test Point Result Pin23 to pin24 1 4 120 Reconnect Reconnect CON8 and Power ON Power Off Tip To protect of MICOM 1 2 Troubleshooting With Error No Yes Pin23 Pin24 35 ...

Page 36: ... WH Yes R1 Sensor Error Is the connection loose CON7 If the same situation appears replace main PCB Otherwise explain to the customer No Yes Test Point Result Pin19to Pin20 6 300 Reconnect Reconnect CON7 and Power ON Power Off Tip To protect of MICOM No Yes Main PCB WH WH R1 Sensor CON7 19 20 Wiring diagram 换 R1Sensor Pin19 Pin20 36 ...

Page 37: ...eplace main PCB Otherwise explain to the customer Reconnect CON8 BK housing and Power ON Housing A Main PCB BO BO D Sensor 21 22 3 4 CON8 4 3 BO BO Wiring diagram Is it displayed under picture Is the connection loose CON8 Power Off Tip To protect of MICOM Yes Pin21 22 Disconnect CON8 Is resistance value between pins 21 22 of CON8 as below BO to BO Test Point Result Pin21 to Pin 22 6 300 Reconnect ...

Page 38: ...diagram Relay Operation Yes Reconnect Pin7 Pin9 Main PCB BN BL WH FUSE M CON4 7 9 DEF Heater Housing A BO D Sensor 21 22 BO 3 CON8 BO BO 2 1 BN BL 1 2 4 3 4 FUSE M Is it displayed under picture Is the connection loose CON4 ENTER the Normal MODE Is the voltage value between pins 7 BN 9 BL WH of CON4 0V AC No Yes Relay operation Test Point Result Pin7 To Pin9 0V Replace MAIN PCB Pin7 Pin9 38 ...

Page 39: ...eater Explain to the customer It can be occurred when the gasket is not stuck to product or when you put the high temperature loads hot foods a lot in the product No Yes Test Point Result 0 30 10 19 53 20 13 03 30 8 896 Is the resistance value of DEF sensor like as below It depends on the temperature Replace DEF sensor Resistance of Defrost Sensor 39 ...

Page 40: ...nt Result Pin10 To pin9 1 4 V Yes No Housing Main PCB BO BL CON8 10 12 9 5 4 3 YL PR F FAN 1 2 3 RD PR BK Wiring diagram Freezer Fan voltage Feedback voltage Yes Freezer Fan Error Yes Pin12Pin9 Pin10 Pin9 Is it displayed under picture Is the connection loose CON8 Reconnect Enter the TEST 1 MODE Is voltage value between pins 9 12 of CON8 as below Explain to the customer Replace MAIN PCB Replace MAI...

Page 41: ...Condenser Fan voltage Yes Enter the TEST 1 MODE Is voltage value between pins 11 16 of CON8 as below No Yes Is the feedback voltage between pin 11 and pin14 of CON8 like as below from motor to main board Test Point Result Pin14 To pin11 1 4 V Feedback voltage Pin16 Pin11 Pin14 Pin11 Is it displayed under picture Is the connection loose CON8 Reconnect Replace MAIN PCB Replace MAIN PCB Explain to th...

Page 42: ...BO GND WH BK 12V BN Tx RD Rx BO GND WH BK 12V 1 4 3 2 4 3 1 2 CON6 CON101 4 3 1 2 Rx Receive Tx Send Wiring diagram Test Point Result pin2 To pin3 1V to 4 V Send signal Voltage N0 Yes Display PCB Is the voltage between pins 1 and pin 3 of CON101 Yes Test Point Result pin1 To pin3 1 V to 4 V Receive signal voltage N0 Reconnect Pin3 Pin2 Pin3 Pin1 Is it displayed under picture Is the connection loos...

Page 43: ...Point Result pin15 To pin18 1 V to 4 V Receive signal voltage Main PCB Is the voltage between pin15 and pin15 of CON5 as below No Reconnect Replace MAIN PCB Yes Test Point Result Pin15 To pin17 1 V to 4 V Send signal Voltage Main PCB Is the voltage between pin15 and pin17 of CON5 as below No Pin15 Pin18 Pin15 Pin17 43 ...

Page 44: ...ace main PCB Otherwise explain to the custo mer Replace R2 Sensor No Yes Test Point Result Pin17 to pin18 6 300 Reconnect Reconnect CON7 and Power ON Power Off Tip To protect of MICOM No Yes Refrigerator2 Sensor Error Main PCB GY GY R2 Sensor CON7 17 18 Wiring diagram Pin17 Pin18 Is it displayed under picture Is the connection loose CON7 44 ...

Page 45: ...se Pin18 To Pin17 0 V Open Pin18 To Pin17 12 V Yes No 1 2 Is the condition of the freezer door switch like as below Yes State Result Normal 0 Ω Push Freezer lamp LED doesn t work No Yes Voltage of Door switch No voltage of Freezer lamp Replace F D S W Replace Freezer lamp LED Explain to the customer Replace Main PCB Main PCB PK PK F DOOR Switch CON5 9 F LED PCB Wiring diagram Pin10 Pin9 BL WH Repl...

Page 46: ...pin12 To pin11 0 V Yes No Door Test Point Result Close pin8 To pin7 0 V Open pin8 To pin7 12 V Yes No Is the condition of the freezer door switch like as below Yes No Yes Voltage of Door switch No voltage of Refrigerator lamp Replace R D S W Replace Refrigerator lamp LED Explain to the customer Pin8 Pin7 1 2 State Result Normal 0 Ω Push Replace Main PCB Replace Main PCB Main PCB SB SB R DOOR Switc...

Page 47: ...pin7 100 300 V AC Output voltage of Comp Yes Yes Pin5 Pin7 N0 Test Point Result pin12 To pin9 12 16 V Freezer Fan voltage Yes Enter the TEST 1 MODE Is voltage value between pins 9 12 of CON8 as below Replace MAIN PCB No Yes Is the feedback voltage between pin 9 and pin10 of CON8 like as below 26 26 26 from motor to main board Test Point Result Pin10 To pin9 1 4 V Feedback voltage Replace MAIN PCB ...

Page 48: ... 2 Compensate with Jump wire cutting RCR1 Temp Compassion Remark 10 0 deg Current 8 2 0 5 deg Cold 5 6 1 0 deg 3 3 1 5 deg 2 0 2 0 deg 470 Ω 2 5 deg JUMP WIRE Temp Compassion JCR3 1 0 deg JCR4 1 0 deg Cutting both jumpers affords a 2º compensation Checking Damper itself Is the resistance Values between 1 4 2 3 like as below No Yes Test Point Result 1 To 4 369 451 Ω 2 To 3 369 451 Ω Replace Damper ...

Page 49: ...edback voltage between pin 11 and pin12 of CON7 like as below from motor to main board Test Point Result Pin11 To pin12 1 4 V Feedback voltage Replace Main PCB Pin13Pin12 Pin12Pin11 Replace Main PCB Enter TEST 1 mode Is the output voltage bet ween pin5 and pin7 of CON201 like as below Is the connection loose CON201 No Yes Reconnect Test Point Result Pin5 To pin7 100 300 V AC Output voltage of Comp...

Page 50: ...CR1 2 Compensate with Jump wire cutting Checking Damper itself Is the resistance Values between 1 4 2 3 like as below No Yes Test Point Result 1 To 4 369 451 Ω 2 To 3 369 451 Ω Replace Damper Resistance of Damper Check the Damper itself 4 YL 2 WH 1 RD 3 BL RCR1 Temp Compassion Remark 180 2 5 deg Warm 56 2 0 deg 33 1 5 deg 18 1 0 deg 12 0 5 deg 10 0 deg Current Jump Wire Temp Compassion JCR1 1 0 de...

Page 51: ...omp Damper All FAN on All things displayed 2 Wire Color BL Blue WH White BO Bright Orange BK Black BN Brown PR Purple RD Red GN Green SB Sky Blue GY Gray RD WH Red White BL WH Blue White BK WH Black White GN YL Green Yellow BO BL Bright Orange Blue GY WH Grey White GN YL Green Yellow BN WH Brown White YL BK Yellow Black RD YL Red Yellow 2 1说明 2 times Damper closed 3 times Return to initial status ...

Page 52: ...Attachments Resistance of Sensor Temp F Sensor Resistance R1 R2 D RT Sensor Resistance 52 ...

Page 53: ...s of terminal Bad connection between plug and adapter faulty plug The distance between pins Pin outer diameter Nopoweron powercord O L Pisoff Noelectricpoweroncompressor Faultycompressor FaultyPTC Disconnectedcopperwire Internalelectricalshort Faultyterminalcontact Disconnected CapacityofO L Pissmall CharacteristicsofO L Pisbad Badconnection Poweris disconnected InnerNi Crwireblowsout Badinternalc...

Page 54: ...veitintheair Moisturepenetration intotherefrigerationoil Capsaremissed Airblowing Duringtransportation Duringwork Notperformed Performed Tooshorttime Lowairpressure Lessdryair AirBlowing Leaveitintheair Capsaremissed Shortpipeinsert Pipegaps Toomuchsolder Toolarge Damagedpipes Notdriedinthecompressor Elapsedmorethan6monthsafterdrying Capsaremissed Nopressurewhenitisopen Duringresttime Afterwork Co...

Page 55: ...Foreignmaterials penetration Capdrainisnotdisconnected Injectthroughthe hole Sealwithdrain P Ulumpinput Screwinput Otherforeignmaterials input Parts disconnected Wireiscut Leadwire Heatingwire Contactpoint betweenheatingand electricwire Dentbyfineevaporator Heatingwireiscorroded Waterpenetration Badterminalconnection Check visually Check terminal Conduction OK No conduction NG If wire is not cut r...

Page 56: ...tion thickness Structuralfault Gasketgap Airinflowthroughthefanmotor Badinsulationofcasedoor SheathHeater rated Heaterplate rated Gap Badattachment Contraction Badadhesion Weakbindingforceathinge Fanmotor Doorswitch Selflocked Wireiscut Badterminalcontact Contactdistance Buttonpressure Meltedcontact Contact Poordoor attachment Doorliner dimension Contractioninner liner Misalignment Badterminal con...

Page 57: ...is constrained Insufficient motorRPM Faultyfan Shorud Bent Iceandforeignmaterialsonrotatingparts Fanshroudcontact Clearance Dampingevaporatorcontact Accumulatedresidualfrost Fanmisuse Badshape Looseconnection Nottightlyconnected Insertdepth Ratingmisuse Smallcapacity Lowvaltage Malfunctionofchargingcylinder Wrongsettingofrefrigerant Insufficientcompressor Faultycompressor Fanoverload Fanmisuse Bad...

Page 58: ...ak Foreignmaterials P Udumpliquid Faultycontact Faultytemperaturecharacteristics Externalairinflow Rubbermotorassemblydirection reverse Dooropens butnotcloses Gaparoundgasket Contraction distortion loose doortwisted cornernot fullyinserted Foodvapor Storinghotfood Unsealedfood Dooropens butnotcloses Gasketgap Coolairleak andtransmitted Highambienttemperature Spaceissecluded Differentrating Smallca...

Page 59: ...ssor compartment operating sounds Compressor sound Sound from machine itself inserted Sound from vibration Restrainer Rubber Too hard seat Distorted Aged Burnt Stopper Bad Stopper Not fit assembly inner diameter of stopper Tilted Not Compressor base not connected Bad welding compressor stand fallen Foreign materials in the compressor compartment O L P sound Chatteringsound Insulation paper vibrati...

Page 60: ...ownfault Coregap Badconnection Correctscrewconnection Badassembly Distortion Foreignmaterialsinside Badconnection Partlydamaged Notconnected Badpipecaulking Normaloperatingsound Vibrationsound Agedrubberseat Badtorqueforassemblingmotor bracket Fanguidecontact Shroudburrcontact Dampingevaporatorcontact Residualfrostcontact Unbalance Iceonthefan Airintake oppositetomotor rubberassembly Supporterdiso...

Page 61: ...Travlel distance Bad connection Bad terminal contact P U liquid leak 1 Lead wire is damaged Wire damage when assembling P T C Cover Outlet burr in the bottom plate Pressed by cord heater lead wire evaporator pipe 2 Exposed terminal Compressor Compartment terminal Touching other components Freezer compartment terminal Touching evaporator pipe 3 Faulty parts Transformer Coil contacts cover Welded te...

Page 62: ...betweendoorlinerandinnerliner Refrigerator compartmentis openedwhenfreezer compartmentis closed faultystopper High Faultydampercontrol Buttonissetat weak Doorisopen interferenceby food Nodeodorizer Poorcapacity Sealcondition Storespecialodorousfood Longtermstorage Odorsfromchemicalprocucts Biggerdoorfoam Hinge Pintilted Poorflatness Nowasher Nogreaseandnotenough quantity Stopperwornout Badfreezerc...

Page 63: ...If fuse blowns out shorted frequently reconfirm the cause and prevent Measures Remarks If resistance is infinite replace it with new one If it is not infinite it is normal Check other parts arts are During forced operation LP Operates Check other parts he Not operate Replace the frozen ration compressor with new one weld evacuate and recharge refrigerant s it is Refer to weld repair procedures ing...

Page 64: ...or switch Door sag fix door Door liner bent replace door or attach sheets Keep clearance between The fan may be refrigerator and walls minimum broken if cleaning 50mm performs while the Remove dust and contaminants refrigerator is on from grill for easy heat radiation Remove the dust with vacuum cleaner from the coils condenser while the refrigerator is off ...

Page 65: ...AGNOSIS in ce Find out the leaking area repair Drier must be replaced evacuate and recharge the refrigerant No leaking remove the remaining refrigerant and recharge new refrigerant ...

Page 66: ...onnect with torch remove the causes evacuate and recharge seal refrigerant Replace the compressor weld Drier must be replaced evacuate and recharge refrigerant warm the Replace if motor does not operate If fan is disconnected check fan damage and reassemble it r Refer to fan motor disassembly and assembly sequence ...

Page 67: ...3 Check the water outlet 4 Push the heater plate to sucking duct manually and assemble the disconnected parts 1 Turn off the power confirm impurities and ice in the gap and supply hot water until the ice in the gap melts down 2 Push the Heater plate to drain bottom with hand and assemble the disconnected parts Faults replace How to replace Refer to main parts ...

Page 68: ...t the frost by forced defrosting 3 Reassemble the heater plate ire e 1 Check the faulty connector of housing and reassemble wrongly fan assembled parts 2 If the parts are very damaged rator remove the parts and replace it ion with a new one tion on ts ...

Page 69: ...d replacement cannot be repaired Replace faulty parts Check parts related to defrosting Moisture cannot frost Check defrosting Check ice on the on the evaporator but evaporator and pipe can be sucked into the refrigerator being condensed and iced interferes with cool air circulation and suppresses sublimation Be acquainted with how to use ...

Page 70: ...hen it can not conditions and replace it be repaired Door assembly and replacement Replace defective parts Check parts related to defrosting Check defrosting Check ice on the evaporator and pipes after forced defrosting Be acquainted with how to use ...

Page 71: ...st fan to be in the center of bell mouth of the fan guide 7 Leve a clearance between interfering parts and seal gaps in the structures 8 Reassemble the parts which make sound 9 Leave a clearance if evaporator pipes and suction pipe touch freezer shroud n ...

Page 72: ...pper if it vibtates severely Explain the principles of refrigeration and that the temperature difference between operation and defrosting can make sounds If evaporator pipe contacts with other structures leave a clearance between them freezer shroud or inner case ...

Page 73: ...ng cycles and refrigerant flowing phenomenon by s internal pressure difference If sound is servere wrap the accumulator with foam and restrainer Broaden the cap of discharge hose for ors defrosting in the compressor compartment Seal the gap with sealant between out and inner cases of hinge in door ...

Page 74: ... Clean the refrigerator Persuade customers not to use plastic bag or wraps with wet food or odorous foods Dry the deodorizer with dryer and Deodorizer option then in the shiny and windy place Remove and replace the deodorants ...

Page 75: ... TR No 2 and 3 pins Replace parts Applicable to hen power is off model with dispenser ead Wire terminals Reconnect Lead ng Main PCB and Wire and directly PCB with a tester connect defective contact terminal to Lead Wire ll LEDs are on when Replace display Refer to display B Test switch is PCB circuit in circuit or when both freezer explanation power freezer key are at the same time for an one seco...

Page 76: ...n PCB explanation ain PCB sensor sensor housing motor lead wire Reconnect lead er wire he voltage between Replace door Refer to load r blue line and fan switch freezer driving circuits in r pressing test switch refrigerator and circuit CB If the voltage is home bar explanation is OK Replace fan motor ulty defrost items in trouble diagnosis Refer to trouble diagnosis function ...

Page 77: ...Heater Replace AC damper ut with a tester or refrigerator control Box Assembly e resistance of Replace refrigerator Refer to sensor tor sensor with a tester sensor resistance characteristic table in circuit explanation e sensor color in the Repair main PCB main PCB sensor sensor housing refrigerator sensor Fix again the ed at cover sensor but refrigerator sensor se visually ...

Page 78: ...circuit explanation related to door Repair lead wire ter itch in parts repair Replace door switch with a tester Reconnect lead Refer to display wire and replace or circuit in circuit directly connect bad explanation contact terminal to lead wire e display and confirm Adjust or replace interfering structures ...

Page 79: ...ith lever Repair lead wire ester witch in parts repair guide Replace lever switch change at photo coupler Replace photo ls with lever switch coupler IC or PCB K if voltage change is 5V ith a tester Replace defective relay ce of parts with a tester Replace defective parts ith a tester Replace defective relay ce of parts with a tester Replace defective parts ...

Page 80: ...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 200 Vacuum EA Use R134a To protect The rubber pipes for R12 refrigerant shall piping exclusive mixing of be melted when they are ...

Page 81: ...ile refrigerator operates scales punching off flier Weld carefully after inlet pinching gas welding machine Check leak at weld joints Electronic Leak Detector Minute leak Use electronic leak detector Driver Ruler Big leak Check visually or fingers Note Do not use soapy water for check Check cooling capacity Check radiator manually to see if warm Check hot line pipe manually to see if warm Check fr...

Page 82: ...not necessary because it does not produce oxidized scales inside pipe because of its short welding time 3 Replacement of drier Inserting a capillary tube Measure distance with a ruler and put a mark 12 3 0 on the capillary tube Insert tube to the mark and weld it KEYPOINTING Observe the sequence for removal of refrigerant If not compressor oil may leak KEYPOINTING Welding without nitrogen blowing ...

Page 83: ... leak will happen 3 Replacement of drier 1 Be sure to replace drier with R134a only when repairing pipes and injecting refrigerant 4 Nitrogen blowing 1 Weld under nitrogen atmosphere in order to prevent oxidation inside a pipe welding Nitrogen pressure 0 1 0 2 kg cm2 5 Others 1 Nitrogen or refrigerant R134a only should be used when cleaning inside of cycle pipes inside and sealing 2 Check leakage ...

Page 84: ...easure the weight Calculate the weight of refrigerant charged into the bombe by subtracting the weight of an evacuated bombe KEYPOINTING If power is applied during vacuum degassing vacuum degassing shall be more effective Operate compressor while charging refrigerant It is easier and more certain to do like this KEYPOINTING Be sure to charge the refrigerant at around 25 C Be sure to keep 5g in the...

Page 85: ...ser Drier Evaporator Bombe Rubber 1 Observe the safety precautions for gas handling 2 Use JIG or wet towel in order to prevent electric wires from burning during welding In order to prevent insulation break and accident 3 The inner case shall be melted and insulation material polyurethane shall be burnt if not cared during welding inner case parts 4 The copper pipe shall be oxidized by overheating...

Page 86: ... HOT LINE Freezer PIPE ASSEMBLY JOINT CONDENSER ASSEMBLY WIRE PIPE ASSEMBLY SUCTION DRIER ASSEMBLY CAPI TUBE Copper Brazer Copper Silver Brazer Silver Brazer Copper Brazer Copper Brazer Copper Brazer Coppper Brazer Silver Brazer Copper Silver Brazer GC B207WLQ CPLQMAG Area M Asia TROUBLE DIAGNOSIS 86 ...

Page 87: ... evaporator in the refrigerator compartment expand and contract as the temperature changes during the refrigerator operation This sound also happens during defrosting twice a day when the ice on the evaporator melts Clunk sound Explain that it comes from the compressor when the refrigerator starts When the refrigerator operates the piston and motor in the compressor rotate at 3600RPM This sound is...

Page 88: ... also makes sound When water Noise from motor sounds Whizz freezes to ice freezing sounds such as click click are heard When ice is being ejected sounds like Whizz produced by a motor to rotate an ice tray and ice dropping and hitting ice bank sounds are also heard Noise when supplying water Explain the principles of water supplied to dispenser When the water supply button in the dispenser is pres...

Page 89: ...stics of ice cream The freezing point of ice cream is below 15 C Therefore ice cream may melt if it is stored in the door rack Store ice cream in a cold place or set the temperature control button of a freezer at strong position Refrigeration is too strong Check the position of temperature control button Check if refrigeration is strong in whole area of the refrigerator or partly near the outlet o...

Page 90: ...tton at strong Frost in the freezer compartment Explain the basic principles of frost formation The main causes for frosting Door was left open Air penetration through the gasket Too frequent door opening parties etc Hot foods are stored before they are cooled down The temperature of freezer is 19 C if temperature is set at MID If hot air comes into the refrigerator fine frost forms as cold air mi...

Page 91: ...iner or in the wrap When is the power connected When should the power be connected You can connect the power right after the installation But if the refrigerator was laid flat during transportation for a long period of time and the refrigerant and compressor oils are mixed up then this will affect badly the performance of a refrigerator Be sure to connect the power 2 3 hours after refrigerator is ...

Page 92: ...connect upper hinge from a hinge supporter by grasping the front part of upper hinge and lifting up Hinge Assembly U in arrow direction A and pull forward in arrow B direction Be careful as the door may be fallen down 4 Lift up the freezer door in arrow direction and disconnect the door from the lower hinge Don t pull a door forward 5 Assembly is the reverse order of disassembly HOW TO DISASSEMBLE...

Page 93: ...arrow to loose 2 1 1 part with a blade screwdrive r 3 Disconnect housing A of a grille fan L from the main body 4 Disassembly of a grille fan L Hold upper part of a grille fan L and pull forward carefully 5 Loosen two screws 6 Disassembly of shroud F U Disconnect housing of B after removing two rail guides with a blade screwdriver 7 Disassembly of shroud F U Hold upper part and pull forward 8 Chec...

Page 94: ...EXPLODED VIEW 210B 210B 210B 210C 210C 202A 205F 201A 203A 207A 207A 501A 207A 279B 207A 279A 200A 94 ...

Page 95: ...EXPLODED VIEW 230A 233A 231A 234A 212G 147A 243E 241A 241C 241B 240B 240B 240D 240C 232A 205F 95 ...

Page 96: ...137B 405F 136A 136B 403A 405C 137A 316B 135A 128C 101B 271B 271A 312A 105B 135B 408A 302B 128E 128D 128F 120B 120B 120C EXPLODED VIEW 120D 401A 130A 126A 125A 270A 402A 131C 131E 131B 131D 154A 131J 132A 131H 126B 96 ...

Page 97: ...152B 162A 162B 177A 177B 151C 151B 151A 271B 271C 270B 402A 115A 101B 116A 140A EXPLODED VIEW 272B 283F 283F 106A 401C 150A 165A 166A 166D 166C 166A MULTI COOLING SYSTEM 116B 160A 161A 166M 166G 165A 97 ...

Page 98: ...4A 303C 303D 300A 310B 317A 307A 307A 316A EXPLODED VIEW 313A 104A 407A 500A 502B 502A 406A 318A 306A 301A 308A 308C 308B 309B 403B 309C 309A 310A 328A 305C 305B 305C 305B 305A 105C 105E 105F 105D 410L 98 ...

Page 99: ......

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LG GC-B197HWL, Service Manual

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