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LG LRFC22750ST, Service Manual

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LG LRFC22750ST Service Manual Download Page 4

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Digital Sensor Control* 

Refrigerator Light 

Shelves 

Chef Fresh

Can Dispenser 

Optibin Crisper 
Keeps fruits and vegetable fresh and crisper

Customcube Icemaker 

Ice Bin 

Full Widht Wire Basket 

Wire Durabase

Filter (inside)* 

Dairy Bin

Egg Box

Design-A-Door Bins

Freezer Light 

Wire Basket 

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*On some models

2. PARTS IDENTIFICATION

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Summary of Contents for LRFC22750ST

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL REFRIGERATOR SERVICE MANUAL MODELS LRFC22750TT LRFC22750SW LRFC22750ST ...

Page 2: ...ACEMENT PARTS LIST 42 51 CONTENTS 2 Please read the following instructions before servicing your refrigerator 1 Check the refrigerator for current leakage 2 To prevent electric shock unplug before servicing 3 Always check line voltage and amperage 4 Use standard electrical components 5 Don t touch metal products in the freezer with wet hands This may cause frostbite 6 Prevent water from spiling on...

Page 3: ...Embossed Metal VCM Stainless HANDLE TYPE Bar INNER CASE ABS Resin INSULATION Polyurethane Foam ITEMS SPECIFICATIONS VEGETABLE TRAY Opaque Drawer Type COMPRESSOR PTC Starting Type EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R 134a 115 g LUBRICATING OIL ISO10 220 ml DEFROSTING DEVICE SHEATH HEATER LAMP REFRIGERATOR 60 W 2EA FREEZER 60 W 1EA W 836 x D 870 x H 1754 mm W 32 91 x D 34 ...

Page 4: ...sh Can Dispenser Optibin Crisper Keeps fruits and vegetable fresh and crisper Customcube Icemaker Ice Bin Full Widht Wire Basket Wire Durabase Filter inside Dairy Bin Egg Box Design A Door Bins Freezer Light Wire Basket B C D A F E G H I J K M N L O P On some models 2 PARTS IDENTIFICATION 4 ...

Page 5: ...ce 4 Push in remaining two clips until you hear each snap securely into place Note Make sure that no part of gasket bracket edge protrudes from beneath door frame edge 3 DISASSEMBLY 5 Frame Cover Handle Gasket Door Bracket Clip Frame Flat Tip Screwdriver Gasket Bracket Figure 3 Figure 1 Figure 2 Figure 4 Gasket Bracket Clip Spring Door Frame Correct Incorrect Figure 5 Left Door Loosen the cover sc...

Page 6: ... cover and working down snap cover back into door 3 2 DOOR ALIGNMENT If the space between your doors is uneven follow the instructions below to align the doors 1 With one hand lift up the door you want to raise at middle hinge 2 With other hand use pliers to insert snap ring as shown 3 Insert additional snap rings until the doors are aligned Three snap rings are provided with unit 6 Figure 6 Corre...

Page 7: ...efrigerator Compartment Lamp 1 Unplug the power cord from the outlet 2 Remove refrigerator shelves 3 Release the hooks on both ends of the lamp shield and pull the shield downward to remove it 4 Turn the lamp counterclockwise 5 Assembly is the reverse of disassembly Replacement bulb must be the same specification as the original Max 60 W2EA 3 5 2 Freezer Compartment Lamp 1 Unplug refrigerator or d...

Page 8: ... the start winding and main winding 4 2 3 PTC Applied Circuit Diagram Starting Method for the Motor 4 2 4 Motor Restarting and PTC Cooling 1 It requires approximately 5 minutes for the pressure to equalize before the compressor can restart 2 The PTC device generates heat during operation Therefore it must be allowed to cool before the compressor can restart 4 2 5 Relation of PTC Starter and OLP 1 ...

Page 9: ...e OLP in any way 4 4 TO REMOVE THE COVER PTC 1 Remove the Cover Back M C 2 Disconnect two housing upper side of comp connected in 3 Loosen two screws on comp base 4 Use a L shaped flap tool to pry off the cover 5 Assembly in reverse order of disassembly 9 Part Customer part number Lot code date code 330 FBYY S1 BOX98 12345678 Physical termination part number Electrical characteristics part number ...

Page 10: ...5 CIRCUIT DIAGRAM 10 ...

Page 11: ...ly needs to be checked by an electrician Replace Compressor Supply voltage rating with 10 Applied voltage isn t in acceptable range 115V 10 Remove PTC Starter from Compressor and measure voltage between Terminal C of Compressor and Terminal 5 or 6 of PTC Check resistance between M C S C and M S in Motor Compressor Check resistance of two terminals in PTC Starter Check resistance of two terminals i...

Page 12: ...ure resistance between No 5 and 6 of PTC Starter with a Tester Figure 19 Separate OLP from Compressor and check resistance value between two terminals of OLP with a Tester Figure 20 Observation value is 115V 60Hz 6 8Ω 30 The resistance value is 0Ω short or open Check another electric component Replace OLP Replace PTC Starter Figure 19 Figure 20 ...

Page 13: ...apacity Replace indicated component Advise customer that the Power supply needs to be checked by an electrician Replace indicated component Cause Check voltage at starting devices Check current flowing in sub coil of Compressor Check rating of OLP Fan motor doesn t run Heavy frost buildup on EVAPORATOR Wire is open or shorted Coil is shorted or open Open Open Replace Defrost Heater Replace indicat...

Page 14: ...igh Is there a gap in the door gasket Is the unit positioned in a firm and even place Are any unnecessary objects placed in the back side of the unit Check if the Drip Tray is not firmly fixed Check if the cover of the compressor enclosure in the lower front side is taken out Check if the door gasket is dirty with an item like juice Is the refrigerator level Is there too much food in the refrigera...

Page 15: ...or don t in inlet only temperature The capillary tube is faulty cool normally WHOLE Freezer Flowing sound of refrigerant Equal to ambient Normal discharging of the CLOG compartment and is not heard and frost isn t temperature Refrigerant Refrigerator don t cool formed MOISTURE Cooling operation Flowing sound of refrigerant Lower than Cooling operation restarts CLOG stops periodically is not heard ...

Page 16: ...ial Very Fast Inefficient Compressor Partial Restriction Complete Restriction Equalization Test Condenser Temperature None Very Fast Very Slow Very Slow Hotter than Normal Air Low Side Leak Loss of Change Compressor Not Pumping Cap Tube Sound Room Temperature Trace of Oil Undercharge Leak Yes No Faint Fast None to Weak The equalization test is trying to restart a compressor using a start kit after...

Page 17: ...with power on Power On Start Position Ice Making Mode Harvest Mode Park Position Fill Test Mode Waits until water becomes cold after starting the ice making operation Runs MOTOR to drop ice from the tray into the ICE BIN Performs Ice Making Mode after supplying water by operating the SOLENOID in ICE VALVE To operate LINE and SERVICE press and hold the Fill Key for 3 seconds The ice maker will run ...

Page 18: ... 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 7 2 3 Harvest Mode 1 Harvest Ice removing refers to the operation of dropping cubes into the ice bin from the tray when ice making has completed 2 Harvest mode 1 The Heater is ON for 30 seconds then the motor starts 2 After performing Step 1 the Heater is turned OFF t...

Page 19: ...ressing the Fill Key repeatedly This changes the time allowed for fill as illustrated in the table below Water supply amount TABLE 19 STAGE TIME TO SUPPLY INDICATIONS REMARKS 1 2 3 4 5 6 sec 6 5 sec 7 sec 7 5 sec 8 sec The water amount will vary depending on the water control Switch setting as well as the water pressure of the connected water line ...

Page 20: ...er supply control panel ERROR indicators in table can be checked only in TEST mode 20 STAGE ITEMS INDICATOR REMARKS 1 2 3 4 5 6 HEATER MOTOR HALL IC I detection of position VALVE HALL IC II detection of full filled Ice Reset Five seconds after heater starts heater will go off if temperature recorded by sensor is 10 C or lever is in up position Five seconds after heater starts you can confirm that ...

Page 21: ...remain activated for 24 hrs The first three hours the compressor and Freezer Fan will be ON The next 21hours the freezer will be controlled at the lowest temperature After 24 hours or if the Express Freezing key is pressed again the freezer will return to its previous temperature 5 During the first 3 hours 1 Compressor and freezer fan HIGH RPM run continuously 2 If a defrost cycle begins during th...

Page 22: ...ed a Ding Dong sound is produced 8 1 8 Defrosting removing frost 1 Defrosting starts each time the COMPRESSOR running time reaches 7 hours 2 For initial power on or for restoring power defrosting starts when the compressor running time reaches 4 hours 3 Defrosting stops if the sensor temperature reaches 8 C or more If the sensor doesn t reach 8 C in 2 hours the defrost mode is malfunctioning 4 Def...

Page 23: ... is completed 23 OPERATING ORDERS Initial power on POWER ON in 0 5 sec in 0 5 sec Total load OFF COMP ON Freezer FAN ON in 7 min in 0 5 sec COMP ON Freezer FAN ON POWER ON COMP ON Freezer FAN ON Defrosting heater ON Defrost heater OFF in 0 5 sec in 0 5 sec in 0 5 sec in 10 sec Temperature of Defrosting Sensor is 45 C or more when unit is newly purchased or when moved Temperature of defrosting sens...

Page 24: ...ays the previous status 24 Defect code signs Defect code signs REFRIGERATOR TEMP COLDER WARMER 37 F IS RECOMMENDED 0 F IS RECOMMENDED FREEZER TEMP COLDER WARMER EXPRESS FREEZING NO ITEM ERROR CODE CONTENTS REMARKS 1 2 3 4 5 6 Failure of freezer sensor Failure of Refrigerator sensor Failure of defrost sensor Failure of Room Temperature sensor Failure of defrost mode Failure of BLDC Fan Motor at Fre...

Page 25: ...at the Compressor Circulating Fan Damper and Defrost Heater are not operating 3 The Open Door Alarm and the Lamp Auto Off feature will work normally and can be demonstrated 4 To reset to normal operation press and hold either Warmer Key for about 5 seconds 25 MODE MANIPULATION CONTENTS REMARKS TEST1 TEST2 TEST3 Reset Push Express Freezing Key and COLDER KEY of Freezer Temp at the Same time for 3 s...

Page 26: ... the MICOM and IC 5 Vdc The voltage for each part is as follows VA1 is a part for preventing over voltage and noise When 385V or higher power is applied the inside elements are short circuited and broken resulting in blowout of the fuse in order to protect the elements of the secondary part of the TRANSFORMER PART VA 1 CE 3 CE 4 CE 5 VOLTAGE 115 Vac 12 Vdc 15 5 Vdc 5 V 26 6 8 100 ...

Page 27: ...ot work 8 2 3 Reset Circuit The RESET circuit allows all the functions to start at the initial conditions by initializing various parts including the RAM inside the MICOM IC1 when the power is initially supplied or the power supply to the MICOM is restored after a momentary power failure For the initial 10ms of power supply LOW voltage is applied to the MICOM RESET terminal During a normal operati...

Page 28: ...ve Open Door Detection Circuit 1 Load Drive Condition Check LOAD TYPE COMP NO 13 NO 14 NO 16 NO 12 NO 15 1V or below 12V DEFROSTING HEATER LAMP VALVE FRENCH DOOR HEATER 1 2 DEW HEATER Measurement Location IC6 Condition ON OFF 28 2 1 Fan motor driving circuit freezing compartment fan 1 This circuit makes standby power 0 by cutting off power supplied to ISs inside of the fan motor in the fan motor O...

Page 29: ...motor driving circuit machine room by cutting off power supplied to ISs inside of the fan motor in the fan motor OFF 1 This circuit makes standby power 0 part part part MOTOR OFF 2V or less 0V 5V MOTOR ON 13V 15V 0V 2V 3V a b c 1 3 6 4 4 5 C FAN 1 2W PPG R40 KTB1151 R46 Q4 3 9KJ KTC3198 4 7KJ FR107 Q5 P11 2KJ 25V D8 R44 R41 R45 CE12 32 1 5KJ 35 220uF 102 D9 P14 FR107 CC20 CC19 10KJ R43 1mH 4 7KJ L...

Page 30: ...g for the surrounding temperature into MICOM OPENING or SHORT state of each TEMPERATURE SENSOR are as follows 30 PIN NO 30 PIN NO 37 Closed 5 V Open 0 V Freezer Refrigerator Door Measurement Location SENSOR CHECK POINT NORMAL 30 C 50 C SHORT CIRCUITED OPEN Freezer Sensor POINT Voltage Refrigerator Sensor POINT Voltage 0 5 V 4 5 V 0 V 5 V Defrosting Sensor POINT Voltage Room Temperature sensor POIN...

Page 31: ...8 2 6 Refrigeration Compartment Stepping Motor Damper Circuit The circuit shown below is the damper circuit to regulate the refrigerator temperature 8 2 7 Dispenser Input 31 7 3 4 4 2 3 ...

Page 32: ... 3kΩ Down Down Change Up Up Up Up Up Up Up Up 1 5 C 1 C 0 5 C No 0 5 C 1 C 1 5 C 2 C 2 5 C 3 C 3 5 C 5 6kΩ Down Down Down 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 2kΩ Down Down Down Down Change Up Up Up Up Up Up Refrigerator 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 RCR 10kΩ Down Down Down Down Down Change Up Up Up Up Up 3 C 2 5 C 2 C 1 5 C 1 C ...

Page 33: ...rcuit The circuit shown above determines whether a function control key on the operation display is pushed It also turns on the corresponding function indication LED Module SEVEN SEGMENT DISPLAY The drive type is the scan type 33 CON 6 1 2 3 4 ...

Page 34: ...nse speed Measure the F SENSOR SUPER FROST SENSOR R1 R2 SENSOR after disconnect CON5 of PWB ASSY MAIN TEMPERATURE RESISTANCE OF FREEZER RESISTANCE OF REFRIGERATOR SENSOR DEFROST SENSOR ROOM SENSOR 20 C 22 3 KΩ 77 KΩ 15 C 16 9 KΩ 60 KΩ 10 C 13 0 KΩ 47 3 KΩ 5 C 10 1 KΩ 38 4 KΩ 0 C 7 8 KΩ 30 KΩ 5 C 6 2 KΩ 24 1 KΩ 10 C 4 9 KΩ 19 5 KΩ 15 C 3 9 KΩ 15 9 KΩ 20 C 3 1 KΩ 13 KΩ 25 C 2 5 KΩ 11 KΩ 30 C 2 0 KΩ ...

Page 35: ...C is poor Replace OLP PTC after compressor shuts off COMPRESSOR RELAY is Replace MAIN PWB don t press the KEY and poor wait THE CONNECTING WIRE Check the connection of the is poor black wire of the MAIN PWB CONNECTOR CON2 2 If refrigerant is leaking Measure the amount of frost Refrigerant leakage Replace the leaking part and sticking on EVAPORATOR replace any lost refrigerant and the surface tempe...

Page 36: ...liner damaged Replace Door liner door is closed DEFROSTING is NO DEFROSTING 1 If HEATER emits heat USE TEST MODE3 HEATER disconnection Replace HEATER poor forced DEFROSTING TEMPERATURE FUSE Replace TEMPERATURE disconnection FUSE Connection is poor Check EVAPORATOR connection and wire of MAIN PWB CONNECTOR DEFROST SENSOR is poor Replace DEFROST SENSOR HEATER RELAY is poor Replace RY2 of MAIN PWB 2 ...

Page 37: ...8 5 MAIN PWB ASSEMBLY AND PARTS LIST 8 5 1 Main PWB Assembly 37 ...

Page 38: ...E FILM FUSE1 D3SBA60 BK SHINDENGEN 600V 4A 80A 10UA 0RS3303J609 84 1UF KME RG YX 50V 0 2 FM5 TP 5 TNC 67 220P 2KV K B S RELAY 6854B50001A CON1 0CK223DK96A RL2 6200JB8004A 0CK102DK96A 0DD400409AC CC8 CC9 CC11 15 CC18 470PF 50V K B TA52 0CK22102510 RL1 22NF 50V Z F TA52 SAM WHA SMW250 YEONHO 6P 2 5MM STRAIGHT SN 0CE106EK638 26 1K OHM 1 4 W 1 00 TA52 KIA7042P KEC 3P BK RESET YEON HO CC17 CC20 95 1MOH...

Page 39: ... 1 2K OHM 1 8 W 2012 5 00 D 16 ROHM RLS4148 ROHM R TP LLDS LL 34 75V 450MA 2000MA 0RD1001E672 KYUNG IN SUNWAY 0CK104DK94A BETTER KPT 1105A 19 R18 R20 4 M54563FP MITSUBISHI 20 R TP CONVERT 100UF MV 16V 20 R TP SMD SMD KIA78L05F KEC SOT 89 TP REGULATOR SWITCH TACT TOSHIBA CAPACITOR FIXED CERAMIC 0ISTLKE003A IC STANDARD LOGIC 0RH2001L622 SAMHWA IC2 9 KID65003AF 16SOP BK 7CH DRIVER 13 LT8323 41 BCN 2 ...

Page 40: ...uF CC6 473 180KJ IC4 2 5 C R7 M RL1 IC7 CC7 FUSE M 5 TEMP COMPENSATION REPLACING RCR1 5 10 nc com G5NB 1A L1 P05 TEST STARTING CAPACITOR D7 275VAC 2 C 3 5 P06 RY4 104 21 5V 275VAC 6 8KJ 2KJ 5 CE1 CSTS0400MG03 CM3 12KJ 35V 0 5 C HEATER 10 27 104 12 7 LAMP R 3 RUNNING CAPACITOR ALZ21B12 RC FILTER 470nF 680J Rocp P02 VDD Vss 8 L2 3 3KJ CE2 1 5 C R3 630V 18KJ KIA431 1 C 2 4KF RC FILTER 15 5V RESET 4 7...

Page 41: ...KJ 2KJ 4 7KJ 10uF FR107 4 7KJ 1mH R27 R28 CE6 3 9KJ R31 223 38 Q5 P11 2K 6 2KJ 6 14 15 2KJ 25V R25 2KJ D8 CE8 2KJ L3 10uF 2KJ 26 1KF 39 10KJ P62 24 R44 223 R41 INT4 33 R21 10 TA7774F R45 2KJ 50V CE12 32 10uF R36 CE11 104 2KJ P20 1 5KJ 35 P71 2KJ FR107 R16 8 1 2 220uF 102 10uF CE9 D9 25V Q2 R19 SW1 10KJ P61 Q3 37 P14 7 R35 4 7K R30 FR107 CC20 RD1 RR1 CC19 R37 220uF D5 P77 R20 223 ZD1 223 34 P60 KTC...

Page 42: ...308A 314A 307A 312A 317A 310A 103A 105A 301A 103B 418A 281A 402A 271C 305B 305B 305C 305C 323B 329C 420A 319A 319C 503D 282B 409D 120B 409B 158A 332A 135C 405A 158E 145B 409B 503C 503E 106A 145A 282F 128F 128E 405C 405F 319E 329A 404A 903D 610A 903E 610A 262H 410G 402A 271A 282E 503G 406B 284D 284D S22 405G 903A 903B 903B 103C 105F 410A 405B 405B 328B 327A S01 S01 ...

Page 43: ...FREEZER PARTS CAUTION Use the part number to order part not the position number 43 136A 285A 136E 136G 136B 136C 131A 128D 248F 131C 248F 145C 136D 248A ...

Page 44: ... not the position number on some models 44 141D 149C 141E 149E 141B 141C 141A 146A 147B 147C 147A 140B 140F 140A 128A 128B 142B 142E 142D 142A 170A 128A S24 128C 128M 278C 128G 160B 154A 161A 151A 155B 161A 160B 151C 168A 160A 103E 103E 103E 103E 151A 103E 103E ...

Page 45: ...ome models 241C 233A 233D 231A 233B 233C 231B 241C 241C 241C 230B 241A 241B 241C 241C 212A 245B 245A 244G 700B 244G 230A 203A 201A 200A 146B 146C 244E 243A 243B 212G 243A 243B 244D 700C 244D 212E 45 147D 244B 244C 244G 244G 244B 700C 244G 244G 244C 244E 621A 621A 262E 262E 233D 104E ...

Page 46: ...ICE MAKER PARTS 46 602A S28 600A CAUTION Use the part number to order part not the position number ...

Page 47: ...ICE WATER PARTS 47 CAUTION Use the part number to order part not the position number 619A 619C 262D 618A 623C 616E 622A 619B ...

Page 48: ...4930JJ1011D 128G LINK 4520JJ2001A 4520JJ2001A 4520JJ2001A 128M GUIDE AIR 4974JJ2011A 4974JJ2011A 4974JJ2011A 131A BANK ICE 5074JL1001B 5074JL1001B 5074JL1001B 131C COVER BANK ICE 3550JJ2045A 3550JJ2045A 3550JJ2045A 135C COVER GRILLE FAN 3550JJ2030A 3550JJ2030A 3550JJ2030A 136A TRAY DRAWER 3390JJ1062A 3390JJ1062A 3390JJ1062A 136B TRAY DRAWER 3390JJ1059A 3390JJ1059A 3390JJ1059A 136C TRAY ASSEMBLY DR...

Page 49: ...JJ8058E 201A DOOR FOAM ASSEMBLY F 5433JJ0022W 5433JJ0022U 5433JJ0022M 203A GASKET ASSEMBLY DOOR 4987JJ1004A 4987JJ1004A 4987JJ1004E 212A HANDLE F 3650JJ1041A 3650JJ1041B 3650JJ1040A 212G MARK 3846JD1007B 3846JD1007B 3846JD1007B 230A DOOR ASSEMBLY R R 3581JJ8056J 3581JJ8056H 3581JJ8056D 230B DOOR ASSEMBLY R L 3581JJ8057L 3581JJ8057K 3581JJ8055C 231A DOOR FOAM ASSEMBLY R 5433JJ0063G 5433JJ0063C 5433...

Page 50: ...T C ASSEMBLY 6748C 0004D 6748C 0004D 6748C 0004D 309A O L P 6750C 0005P 6750C 0005P 6750C 0005P 310A COVER P T C 3550JA2042A 3550JA2042A 3550JA2042A 312A RUBBER SEAT 5040JA3031A 5040JA3031A 5040JA3031A 314A STOPPER COMP 4620JA3009A 4620JA3009A 4620JA3009A 315A COMP BASE ASSEMBLY STD 3103JJ1001J 3103JJ1001J 3103JJ1001J 317A DRIER ASSEMBLY 5851JJ2002B 5851JJ2002B 5851JJ2002B 318A HOLDER DRIER 4930JJ...

Page 51: ... 5989JA0002A 5989JA0002A 5989JA0002A 602A HOLDER BRACKET 4930JA3037A 4930JA3037A 4930JA3037A 610A COVER SENSOR 3550JJ2020A 3550JJ2020A 3550JJ2020A 616E TUBE PE 5210JA3005N 5210JA3005N 5210JA3005N 618A TUBE INJECT 5210JJ3005B 5210JJ3005B 5210JJ3005B 619A VALVE WATER 5220JA2009D 5220JA2009D 5220JA2009D 619B COVER VALVE 3550JJ2024A 3550JJ2024A 3550JJ2024A 619C VALVE ASSEMBLY WATER 5221JA2008G 5221JA2...

Page 52: ...P No 3828JL8076B May 13 2005 ...

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