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LG LFC23760SB, Service Manual

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LG LFC23760SB Service Manual Download Page 5

1. SPECIFICATIONS

- 4 -

LFC23760SW /04

LFC23760ST /04

LFC23760SB /04

Super White

Stainless

Black

PCM

Stainless

VCM

Yes (2) 40W/Blue

No

1Fix(S/Proof)+1Fold+2S/Out(S/Proof)

Embo (normal)

Vista

ICE PLUS

3 left + 3 right

Anti-freezing Heater

Drier

Full Automatic

Heater Defrost

Cyclo, Pentane

MQ53LAUM PTC Starting Type

4 Hours

7 - 40 Hours

Heater, Sheath

Water Tank Heater

F

R

E

E

Z

E

R

Basket, Quantity

Tray meat

Lamp

Shelf

No

Yes (1) 40W/Blue

No

Egg Bank

R

E

F

R

IG

E

R

A

T

O

R

Case Material

Door Material

Handle Type

Display Graphic

Lamp

Shelf

Ice Tray & Bank

Basket, Quantity

Compressor

Fin Tube Type 

Wire Condenser 

Polyol Ester (POE) RL-7H/7 cst 220 ± 10cc

First Defrost

Condenser

Lubricanting Oil

 ID Ø0.75 

Cooling System

Rated Rating

Climate class

Yes (Cover + Egg tray)

1B/(1EA)

MOLECULAR SIEVE XH-7 

Defrost Cycle

Desfrosting Device

Evaporator

Capillary Tube

Temperature Control

Defrosting System

Insulation

M

O

D

E

L

S

SPECIFICATIONS

Capacity

Refrigerant

Net Weight

Dimensions 

G

E

N

E

R

A

L

F

E

A

T

U

R

E

S

Color

R134a

Temperate (T)

115V~ / 60Hz

MICOM control

892 (W) x 925 (D) x 1860 (H) mm

123 Kg

23 cuft

Fan Cooling

Summary of Contents for LFC23760SB

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL REFRIGERATOR SERVICE MANUAL MODELS LFC23760ST 04 LFC23760SW 04 LFC23760SB 04 ...

Page 2: ... Change connector rail in order to reduce claims for bad sealing and door misaligned New connector rail has 1º degree of inclination Rev 02 Valve inclined in order to improve house connection Rev 03 Change model to Barrierless type Twisting Ice Maker Rev 04 Compressor change from MQ53LAUM PTC to MQ53LAUM e PTC ...

Page 3: ...STMENT 4 1 Compressor 4 2 PTC Starter 4 3 OLP overload protector 5 CIRCUIT DIAGRAM 6 TROUBLESHOOTING 6 1 Compressor and electric components 6 2 PTC and OLP 6 3 Other electrical components 6 4 Service diagnosis chart 6 5 Refrigeration cycle 7 OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER 7 1 Operation principle 7 2 Ice maker functions 8 CIRCUIT OF MICOM 8 1 Function 8 2 PCB function 8 3 Resista...

Page 4: ...t touch metal products in the freezer with wet hands This may cause frost bite 6 Prevent water from spiling on to electric elements or the machine parts 7 Before tilting the refrigerator remove all materials from on or in the refrigerator 8 When servicing the evaporator wear gloves to prevent injuries from the sharp evaporator fins 9 Service on the refrigerator should be performed by a qualified t...

Page 5: ...Bank REFRIGERATOR Case Material Door Material Handle Type Display Graphic Lamp Shelf Ice Tray Bank Basket Quantity Compressor Fin Tube Type Wire Condenser Polyol Ester POE RL 7H 7 cst 220 10cc First Defrost Condenser Lubricanting Oil ID Ø0 75 Cooling System Rated Rating Climate class Yes Cover Egg tray 1B 1EA MOLECULAR SIEVE XH 7 Defrost Cycle Desfrosting Device Evaporator Capillary Tube Temperatu...

Page 6: ...epth w o Door Depth Total with Door Open Height to Top of Case Height to Top of Door Hinge Width Width door open 90 deg w o handle Width door open 90 deg w handle A B C D E F G H I Description LFC23760 28 36 41 45 32 67 11 16 34 5 8 32 1 8 69 1 16 ...

Page 7: ...resh and crisp Chef Fresh Snack Pan Can Dispenser Temperature Control Shelves Refrigerator Light Icemaker Dairy Compartment A B C G H I J E F K D L M N O P below The location of some of the parts may not correspond to that of your model Read this section to familiarize yourself with the parts and features of your new refrigerator NOTE This guid ecovers different models Your refrigerator could have...

Page 8: ...and crisper Chef Fresh Snack Pan Can Dispenser Shelves Refrigerator Light Icemaker Dairy Compartment A B C G H I D E J K L N O F M Read this section to familiarize yourself with the parts and features of your new refrigerator NOTE This guid ecovers different models Your refrigerator could have some or all of the features and parts listed below The location of some of the parts may not correspond t...

Page 9: ...venting over heating of the Heater when defrosting At 72 C it turns the Defrost Heater off 1 Pull out the grille assembly Fig 1 2 Separate the connector with the Defrost Control assembly and replace the Defrost Control assembly after cutting the Tie Wrap Fig 2 1 Unplug your refrigerator 2 Pull out all of the shelves 3 Slide a flat screwdriver 1 into the opening of the light bulb and pull it downwa...

Page 10: ...n the botton position 3 4 CONTROL BOX REFRIGERATOR CONTROL BOX COVER LAMP 1 First remove all shelves in the refrigerator than remove the Refrigerator control Box by loosening 2 screws 2 Remove the Refrigerator Control Box by pulling it downward 3 Disconnect the lead wire on the right position and separate the lamp sockets 8 ...

Page 11: ...SEMBLE 3 6 2 ASSEMBLE 1 Unscrew the back cover 2 Unscrew the valve from the back side cover 3 Push to the left and release 1 Insert the ribs to the right side of the back hole cover 2 Screw the valve from the back side cover 3 Screw the back cover ...

Page 12: ...id 1 remove it after that 1 2 With the 10mm socket wrench loose the two pins from the hinge 3 and remove it 4 3 4 Unplug the switches cable 2 it s optional it s no neccesary do it for removing the door Place the door with the inner face over the surface so it won t scratch 5 Unplug the switches cable 6 it s optional it s no neccesary do it for removing the door 6 Unplug the cable harness pulling u...

Page 13: ...with the divisor of the refrigerator s door 3 Check that the sealing patch of the door is leveled to the refrigerator and that it isn t bended 9 10 11 hinge 1 7 Front view of the harness Place the hinge in its original position 4 assembly the two pins 5 and the ground screws 6 Plug the cable harness 7 and the switch 8 just in case 7 8 4 5 6 3 2 Right Door if you unplugged the switch Place the hing...

Page 14: ... the sealing patch of the door ends leveled with the refrigerator and that it isn t bended 11 Left Door Plug the cable to the switch 16 just in case if you 16 Place the hinge s lid 17 and screw the two screw 18 Check that the door is well installed 18 17 Loose the screws 1 with the Allen tool 3 32 and remove the handle 2 Remove the mounting screws with the Allen tool 3 Mounting Screws Allen Wrench...

Page 15: ...he freezer s handle With an 3 32 Allen tool loose the screws 1 located on from the door 3 with an Allen tool the bottom of the handle remove it 2 remove the screws Mounting Screws Screws 3 2 1 Wrench Allen 3 2 1 3 3 To install the freezer s handle Install the mounting screws over the door 1 place the handle over them 2 and tight the screws up 3 1 2 3 1 13 ...

Page 16: ...iling tracks order to lift it up Separate the left and right rail cover 2 3 CAUTION When removing the drawer do not hold the handle If it comes off it could cause personal injury CAUTION To place the drawer on the floor take care not to damage the floor or hurt your feet with the sharp edges on the side with the hinges With both hands hold both sides of the door and pull up to separate it With bot...

Page 17: ...figure screws 3 Right Rail Left Rail Align the top holes of the rail cover with the top holes of the door supports to mount the cover With the drawer fully extended insert the lower basket over the front part of the rail assembly and then the WARNING To prevent entrapment risk and accidental child or animal suffocation DO NOT permit them to play inside of the drawer WARNING DO NOT step ot sit on t...

Page 18: ... grille Refer to the section on Installation of Base Grille Use a flat head screwdriver to adjust the leveling screws turning clockwise to raise the side of the refrigerator and counter clockwise to lower it It may NOTE Having someone push against the top of the refrigerator takes some weight off the leveling screws This will make it easier to adjust the screws 4 5 Ensure that the refrigerator is ...

Page 19: ...ent flow to both 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 St...

Page 20: ...nts the Motor Coil from being started in the Compressor 2 For normal operation of the OLP do not turn the Adjust Screw of the OLP in any way 18 Part Customer part number Lot code date code 330 FBYY S1 BOX98 12345678 termination part number Electrical characteristics part number No Name Base phenolic UL 94 V 0 rated Movable arm support Stationary contact support plated steel Heater support plated s...

Page 21: ...5 CIRCUIT DIAGRAM 19 CIRCUIT DIAGRAM ...

Page 22: ...r from compressor and measure voltage between T erminal C of compressor and terminal 5 or 6 of PTC Check resistance of two terminals in PTC Starter Check resistance of two terminals in OLP Check the power supply under load Compressor attempting to re start after being off for 5 minutes Check resistance of PTC Starter Check OLP Check starting state Check resistance of motor compressor Check the res...

Page 23: ...a T ester Figure 1 Observation value is 115V 60Hz 6 8 20 The resistance value is 0 short or open Check another electric component Replace OLP Replace PTC Starter Figure 1 Figure 2 Normal operation of compressor is impossible or poor Separate OLP from compressor and check resistance value between two terminals of OLP whit a tester Figure 2 21 ...

Page 24: ...city 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 Wire is open or shorted Coil is shorted or open Open Open Replace defrost heater Replace indicated component Replace indicated compon...

Page 25: ... high Are any unnecessary objects placed Check if the Tray Drip is not firmly fixed Check if the cover of the compressor enclosure in the front lower side is taken out Check if the door gasket is dirty with an item like juice Check if the inside of the unit is dirty The unit smells of plastic Plug into the outlet Set the switch to ON Replace the fuse If the voltage is low correct the wiring Place ...

Page 26: ...frigerant is not heard and frost isn t formed Flowing sound of refrigerant is not heard and frost melts Low flowing sound of refrigerant is heard and frost forms in inlet only Flowing sound of refrigerant is not heard and there is no frost A little higher than ambient temperature Refrigerant level is low due to a leak Normal cooling is possible by restoring the normal amount of refrigerant and rep...

Page 27: ...t Partial 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 after it has been...

Page 28: ...aking Control Water supply control Waits until water in the TRAY is frozen after Icemaker Starts operation Runs MOTOR to drop ice from the tray into the ICE BIN Performs Icemaking 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 icemaking will run through 3 stages Harvest Fill Icemaking Power Input Adjusts E...

Page 29: ... to the TRAY a This is to eject ice from the TRAY after ice making is completed b If Hall IC signal is on within 3 6 seconds after ice ejection motor rotates in normal direction it does not proceed ice ejection but waits If the ice bank is full ice ejection motor rotates in normal direction in every hour to check the condition of ice bank If the ice bank is not full the water supply control starts...

Page 30: ...Sensor Output Signals ON OFF Bank is full Ice checking AXIS LEVEL 30 8 0 10 32 41 53 58 80 160 170 Lock Lock Icemaking original point Ice ejection MAXIMUM TILTING POINT Ice checking AXIS A B C 9 3 sec 8 3 sec 2 1 sec Level Return Conditions Horizontal Conditions ...

Page 31: ...F 8 0 3 OFF ON 10 0 4 ON ON 11 0 DIP S W Setting will be depend of water pressure DISP S W No Water Supply Time Note Test function starts when test switch is pressed for more than 3 seconds User shouldn t force operation while doing test mode service or cleaning Test switch will work only when ice tray its in horizontal position not during ice ejection or water supplying When pressing the Test Swi...

Page 32: ... function will remain activated for 24 hrs The first three hours the compressor and ICE PLUS will be ON The next 21hours the freezer will be controlled at the lowest temperature After 24 hours or if the ICE PLUS key is pressed again the freezer will return to its previous temperature 5 For the first three hours notice the following cases 1 Compressor and freezer fan HIGH RPM continuously operate f...

Page 33: ...ect diagnosis function 8 1 9 4 Defrosting won t function if its sensor is defective wires are cut or short circuited 8 1 8 Electrical Parts Are Turned On Sequentially Electrical parts such as COMP defrosting heater freezer FAN etc are turned on in the following order to prevent noise and parts damage Several parts are started at the same time at initial power on and are turned off together when TE...

Page 34: ...jecting does not operated on pressing the I M TEST S W 8 Failure of Icemaker Sensor All Off Snapping or short circuit of ice making sensor Connecting Wire Test On Sensor ERROR INDICATION Inspect Connecting Wires on each sensor Primary Error F sensor R1 sensor D sensor Defrost errors F FAN errors Secondary Error I M sensors I M Kit RT sensor When an error occur the first 3 hours the Primary Error a...

Page 35: ...ng Heater OFF 4 Display LED all ON 1 Compressor and the freezer fan OFF 2 Stepping Damper CLOSE 3 Defrosting heater ON 4 Display LED 1 3 5 7 ON Reset to initial status COMP 7 min delay Or Push TEST switch on the main Board once Cooling MODE Or Push TEST switch once In TEST MODE 1 Forced desfrosting MODE Maximum test time 2 hours Reset if the temperature of the defrosting sensor is 8 C 46 F or more...

Page 36: ... 34 8 2 PCB FUNCTION CON 1 CON 3 CON 2 CON 8 CON 9 CON 10 CON 7 CON 6 CON 5 CON 4 ...

Page 37: ...left open for 7 minutes or longer the lamp of the refrigerator turns off automatically French Door Heather Con 3 Pin 1 Con 3 Pin 3 115 VAC Fig 1 RD L N PK 2 Cr CAPACITOR PART OLP POWER CORD SUPPLY 4 M 5 YL GN GN YL GN Cs S 9 PR 3 4 6 5 7 RD BN 8 SB 1 CON 2 SB 2 FUSE M 72 C nc A B com com DOOR S W F nc ICE VALVE LAMP F DEF HEATER BL P T C COMP ACCESSORIES PLUG TYPE CAPACITOR PART P T C START AND CO...

Page 38: ...9 D Sensor Con 7 Pin 6 Con 7 Pin 7 I M Sensor Con 7 Pin 1 Con 9 Pin 2 Motor On Motor Off Freezer Fan Con 4 Pin 5 Con 4 Pin 6 10 14Vdc 2Vdc or less Cooling Fan con 4 Pin 2 Con 4 Pin 3 10 14Vdc 2Vdc or less Output Voltage Pin Number Pin Number FAN PIN 12 11 10 9 8 7 6 5 4 3 2 1 NC NC NC V G F V G NC Stepping Motor Connector 4 NC C Fan F Fan PIN 10 9 8 7 6 5 4 3 2 1 Connector 9 I M Motor Hall IC I M ...

Page 39: ...open in the sensor circuit R Door S W 3 Pin RT sensor 1 4 Pin Connector 8 2 PIN 11 10 9 8 7 6 5 4 3 2 1 NC R Sensor F Sensor Connector 7 Pipe Heater F Door S W D Sensor Fig 2 1 CON 4 4 C GY R DOOR S W D BN 2 1 BN RT SENSOR 3 GY CON 8 5 6 GY PR 4 3 9 8 7 BN WH BL BK YL 10 RD 12 11 F FAN STEPPING MOTOR HALL 8 9 10 YL WH RD I M MOTOR 5 6 7 4 BO BN BK BL S W I M TEST S W ICE MAKER IC 3 BO PART STOP S ...

Page 40: ...NSOR TEMPERATURE DETECTED RESISTANCE OF FREEZER RESISTANCE OF REFRIGERATOR DEFROST SENSOR ROOM SENSOR SENSOR SENSOR 20 C 15 C 10 C 5 C 0 C 5 C 10 C 15 C 20 C 25 C 30 C 40 C 50 c 22 3 K 16 9 K 13 0 K 10 1 K 7 8 K 6 2 K 4 9 K 3 9 K 3 1 K 2 5 K 2 0 K 1 4 K 0 8 K 77 K 60 K 47 3 K 38 4 K 30 K 24 1 K 19 5 K 15 9 K 13 K 11 K 8 9 K 6 2 K 4 3 K This delay is necessary due to sensor response speed 38 ...

Page 41: ...03B 418A 281A 271C 305B 305B 305C 305C 503D 282B 409D 120B 409B 158A 125D 332A 135C 405A 158E 145B 409B 503C 503E 106A 145A 282F 128F 128E 405C 405F 319E 329A 404A 903D 610A 903E 610A 262H 410G 271A 503G 406B S22 405G 105F 410A 327A S01 B01 S01 503F S38 402A 282E 402A EV 317A 309A 307A 312A 310A 328A 412D 323B 329C 420A 319D 405B 405B 308A 103C ...

Page 42: ...136A 136B 248E 248F 131A 145C 145F FREEZER PARTS CAUTION Use the part number to order part not the position number EV ...

Page 43: ...03E 146A 170A 128A 103E 103E 128B 143F 142E 142D S24 S24 140B 140B 140B 140B 140E 140E 140E 140D 140D 140D 143E 143E 143E S24 S24 S24 S24 S24 S24 305D REFRIGERATOR PARTS CAUTION Use the part number to order part not the position number EV ...

Page 44: ...C 231B 230B 262E 233A 233D 231A 230A 249J 249K 262E 233D 250B 249E 249A 621B 249F 249B 250B 621C 244A 243A 243B S27 286A 212G 243A S27 243B 286A 244A 233E 233G 233F 233H 212J 212J 212A 212J DOOR PARTS CAUTION Use the part number to order part not the position number EV ...

Page 45: ...616E 622B 627A ICEMAKER PARTS CAUTION Use the part number to order part not the position number EV 619C S31 600A ...

Page 46: ...February 2011 MFL62526033 ECN04 ...

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