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LG LBC22520TT, Service Manual

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LG LBC22520TT Service Manual Download Page 1

CAUTION

BEFORE SERVICING THE UNIT, 
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

REFRIGERATOR

SERVICE MANUAL

MODELS:

 

  
  

LBC22520SB
LBC22520ST
LBC22520SW
LBC22520TT

Summary of Contents for LBC22520TT

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL REFRIGERATOR SERVICE MANUAL MODELS LBC22520SB LBC22520ST LBC22520SW LBC22520TT ...

Page 2: ... 2 3 4 5 5 7 10 10 10 11 11 12 13 13 13 14 14 15 16 16 17 18 19 20 22 22 23 24 25 25 29 36 37 39 42 44 SAFETY PRECAUTIONS 1 SPECIFICATIONS 2 PARTS IDENTIFICATION 3 DISASSEMBLY 3 1 Refrigerator Door 3 2 Freezer Door 3 3 Fan and Fan Motor 3 4 Defrost Control Assembly 3 5 Lamp 3 6 Control Box Refrigerator 3 7 Multiduct 3 8 Cover Valve 4 ADJUSTMENT 4 1 Compressor 4 2 PTC Starter 4 3 OLP overload prote...

Page 3: ...ng MICOM control GENERAL FEATURES Color Tray Drawer F L FREEZER Basket Quantity Tray meat Ice Tray Bank Basket Quantity Anti freezing Heater Drier Lamp Shelf Egg Bank Lamp Shelf Yes 2 40W Blue 4EA FIXED Yes REFRIGERATOR Case Material Door Material Handle Type Display Graphic Fin Tube Type Wire Condenser Polyol Ester ISO 10 220 cc MOLECULAR SIEVE XH 7 ID Ø0 75 4 Hours Defrosting System First Defros...

Page 4: ... items listed below The locations of the features shown below may not match your model Digital Sensor Control Refrigerator Light Shelves Snack Pan Optibin Crisper Keeps fruits and vegetable fresh and crisp Ice Trays Ice Bin Wire Durabase Dairy Bin Design A Door Wire Freezer Shelf Refrigerator Door Rack Freezer Light Freezer Door Rack B C D A F E G H I J L M K N A B C D E F G H I J M N L K on some ...

Page 5: ...ove Hinge Pin from the Middle Hinge Bracket Use a 10mm or 13 32 inch socket wrench to remove the 2 bolts in Middle Hinge Bracket Remove screw Set Middle Hinge Bracket and other parts aside Fig 21 Middle Hinge Bracket Middle Hinge Pin Bolts Screw Fig 4 3 1 REFRIGERATOR DOOR screwdriver and remove Fig 5 Using 10mm or 13 32 inch socket wrench remove the 3 bolts and lift off the T op Hinge Set parts a...

Page 6: ...the action can be done with your forefinger or thumb finger or with both NOTE T o assist in installing the handle on the right side place a small piece of masking tape near the top of the handle before removing Grasp the handle tightly with both hands and slide the handle up this may require some force The keyhole slots on the back of the handle allow the handle to separate from the mounting screw...

Page 7: ... force Screws Keyhole slots mounted on back of on door handle Fig 17 3 2 1 REMOVE FREEZER DOOR IMPORTANT To avoid possible injury product or property damage you will need two people to perform the following instructions Carefully lift up the door Remove and place it on a non scratching surface Using a 13 32 10mm socket wrench with 2 extension loosen the 2 bolts and remove bottom hinge from right s...

Page 8: ... Remove the bolt on bottom of refrigerator from the left side and insert it on the right side You will need this hole for the Bottom Hinge Fig 23 Fig 24 Before After Change the Hinge Pin from the right side to left side Fig 25 Move the Bottom Hinge to the left side keeping the same orientation and attach 2 bolts Fig 26 You will need these holes for the Middle Hinge Bracket With a flat head screwdr...

Page 9: ...p Top Hinge with holes in top of refrigerator Use the 3 bolts to replace the Hinge F i g 1 8 Fig 32 Top Hinge Pin Replace cover from left side of refrigerator top onto the right of top to cover holes Cover is also force fitted Tighten Bolts Force fit T op Hinge Cover over top Hinge Fig 33 Fig 34 Reattach Bottom Hinge attaching the 2 bolts 3 2 3 HOW TO REPLACE FREEZER AND REFRIGERATOR DOORS Reattac...

Page 10: ...ove 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 Assemble in reverse order of disassembly 6 Replacement bulb must be the same specification as the original Max 60 W 2EA 3 5 LAMP 3 5 1 REFRIGERATOR COMPARTMENT LAMP 3 5 2 FREEZER COMPARTMENT LAMP 1 Unplug refrigerator or disconnect power 2 Reach ...

Page 11: ...ontrol 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 3 7 MULTI DUCT 1 Remove an upper and lower Cap by using a flat screwdriver and loosen 2 screws Figure 43 2 Disconnect the lead wire on the botton position Fig 43 11 ...

Page 12: ...d release 4 Turn the cover valve 120 as shown in the picture then release it 3 8 2 ASSEMBLE 1 Insert the cover valve as shown in the picture push to insert may need force 3 Push to the right to insert the cover valve 4 Then push to inside to assembly a b 2 Insert hook a b 3 Release hook a b a b ...

Page 13: ...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 14: ... REMOVE THE COVER PTC 1 Remove the screws on the Cover Back and take it out 2 Remove the screw on Cover PTC 6 Assembly in reverse order of disassembly 1 2 14 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 su...

Page 15: ... 1 98 C FUSE M I MAKER W VALVE BK V S W Cr RD PK 2 2 CAPACITOR PART CAPACITOR PART CON6 1 BL 2 1 RD BK 5 5 6 6 4 4 3 3 PTC STARTER Cs BL COMP ACCESSORIES POWER PK PINK YL YELLOW BK BLACK GN GREEN BN BROWN PWB PCB ASSEMBLY ICE MAKER WH WHITE BL FUSE M BL B A HEATER SHEATH BO RD 72 C nc BK OLP YL S GN PART PART S GN YL M COMP EARTH COMP EARTH GN GN BL PR F LAMP nc R LAMPS D C BL nc PR PURPLE BO BRIG...

Page 16: ...nd 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 resistance between M C...

Page 17: ... T ester Figure 1 Observation value is 115V 60Hz 6 8 20 The resistance value is 0 short or 8 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 17 ...

Page 18: ...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 19: ...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 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 Is the refrigerator level Is there too much food in the refrigera...

Page 20: ...l is low due to a leak Normal cooling is possible by restoring the normal amount of refrigerant and repairing the leak Equal to ambient temperature No discharging of refrigerant Normal cooling is possible by restoring the normal amount of refrigerant and repairing the leak A little higher than ambient temperature Normal discharging of the refrigerant The capillary tube is faulty Equal to ambient t...

Page 21: ...g Do not mix with R 12 refrigerant To remove the moisture from pipe inside Defect in refrigerant leak area The opening time should be reduced to a half of the standards during rain and rainy seasons the penetration of water into the pipe is dangerous Refer to repair note in each part R 134a refrigerant is more susceptible to leaks than R 12 and requires more care during welding Do not apply force ...

Page 22: ...e Park Position Fill Test Mode Waits until water becomes cold after starting the Icemaking 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 Cube Size button for 3 seconds The icemaking will run through 3 stages Harvest Fill Icemaking With the detect lev...

Page 23: ...ed if it reaches start position again while Heater Motor are on at the same time A ice bin is full The EJECTOR stops heater off B ice bin is not full The EJECTOR rotates twice to open for ice NOTE If the EJECTOR does not rotate once within 5 minutes in status 2 separate heater control mode starts operating to prevent the EJECTOR from being constrained It is recommended that the user open for ice t...

Page 24: ...r supply control panel ERROR indicators in table can be checked only in TEST mode STAGE ITEMS INDICATOR REMARKS 1 2 3 4 5 6 HEATER MOTOR HALL IC TRAY SOLENOID VALVE HALL IC LEVER Reset Five seconds after heater starts heater will go off if temperature recorded by sensor is 10 C 50 F or lever is in up position Five seconds after heater starts you can confirm that motor is moving You can confirm Hal...

Page 25: ...er on again ICE PLUS function will be canceled 4 To activate these function you need to press the ICE PLUS key and the LED will turn ON This function will remain activated for 24 hrs The first three hours the compressor and ICE PLUS will be ON The next 21 hours 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...

Page 26: ... 3 Defrosting stops if the sensor temperature reaches 46 4 F 8 C or more If the sensor doesn t reach 46 4 F 8 C in 1 hours the defrost mode is malfunctioning 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 ...

Page 27: ...TENTS REMARKS 1 2 3 4 Failure of freezer sensor Failure of Refrigerator sensor Failure of defrost sensor Poor of defrost Cut or short circuit wire Cut or short circuit wire Cut or short circuit wire Inspect Connecting wires on each sensor Snapping of defrost heater or Temperature fuse pull out of Connector indicated minimum 1 Hours after failure occurs All off All off All off All off LED OFF LED O...

Page 28: ...nstrated 4 It reset if you do again as clause MODE MANIPULATION CONTENTS REMARKS TEST1 TEST2 Reset Push ICEPLUS key and ADJUST key of Freezer temperature at the same time over 3 seconds Or press TEST S W one time in the Main PCB board Push ICEPLUS key and ADJUST key of Freezer temperature at the same time over 3 seconds being in TEST MODE1 Or press TEST S W one time being in TEST MODE 1 Push ICEPL...

Page 29: ... and 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 29 ...

Page 30: ...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 31: ...m a temporary change of speed for the fan motor and applies DC voltage up to 7 5V 16V to motor 3 This circuit prevents over driving the fan motor by cutting off power applied to the fan motor in the lock of fan motor by sensing the operation RPM of the fan motor 31 LOAD TYPE COMP NO 14 NO 12 NO 11 NO 12 1V or below 12V DEFROSTING HEATER LAMP TCM POWER MODE OPTIONAL Measurement Location IC6 Conditi...

Page 32: ...lied to the fan motor in the lock of fan motor by sensing the operation RPM of the fan motor a Part b Part MOTOR OFF 2V or less 0V MOTOR ON 13V 15V 0V 32 4 Buzzer Drive Condition Check OFF IC1 0 V IC1 0 V Measure ment Location Condition 0 V 5 V 0 V 5 V 0 5 s 0 5 s 2 63 kz Beep OFF 0 05 s 0 1 s 0 2 s 2 s 0 V 5 V 0 V 5 V 2 63 kz Ding 2 21 kz Dong A B Tone Ding Dong when the button on the display is ...

Page 33: ...e FREEZER Temperature and DEFROST SENSOR temperature for defrosting and the indoor temperature for compensating for the surrounding temperature into MICOM OPENING or SHORT state of each TEMPERATURE SENSOR are as follows 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 A B C FR...

Page 34: ...rator temperature 34 8 2 7 Temperature Compensation Overcooling Undercooling Compensation Circuit 1 Refrigerator Temperature Compensation Table of Refrigerator temperature compensation OPTION CUTTING REMARK JCR1 R 1 0 deg compensation JCR2 R 1 0 deg compensation JCR3 R 1 0 deg compensation JCR4 R 1 0 deg compensation Colder Warmer ...

Page 35: ...es whether a function control key on the operation display is pushed It also turns on the corresponding function indication LED LED Module SEVEN SEGMENT DISPLAY SEVEN SEGMENT DISPLA Y MODULE The drive type is the scan type 8 2 9 Power Failure Compensation Circuit DISPENSER MODEL 35 ...

Page 36: ...ENSOR has a 5 common diference Measure the resistance of the SENSOR after leaving it for over 3 minutes in the measuring temperature This delay is necessary due to sensor response speed 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 3K 16 9K 13 0K 10 1K 7 8K 6 2K 4 9K 3 9K 3 1K 2 5K 2 0K 1 4K 0 8K 77K 60K 47 3K 38 4K 30K 24 1K 19 5K 15 9K 13K 11K 8 9K 6 2K 4 3K ...

Page 37: ...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 38: ...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 39: ...8 5 MAIN PWB ASSEMBLY AND PARTS LIST 8 5 1 Main PWB Assembly 39 ...

Page 40: ...8 5 2 Replacement Parts List 40 ...

Page 41: ...8 5 3 PWB Assembly Display and Parts List 41 ...

Page 42: ...8 6 PWB DIAGRAM 8 6 1 PWB Main Assembly 42 ...

Page 43: ... 43 ...

Page 44: ...A 319E 405F 404A 405G 329A 405C 401A 405A S22 332A 135C 903B 103C 903A 903B 315A 105F 305C 305B 305B 305C 106A 410G 304A 411A 619B 501A 501F S38 158E 610A 903D 503D 503C 503E 10 EXPLODED VIEW CASE PARTS CAUTION Use the part number to order part not the position number 105A 327A 318A 317A 309A 314A 307A 419B 307B 312A 310A 328A 412D 308A 323B 319A 319C 405B 405B 329C 420A 44 ...

Page 45: ...131A 149A 136C EV FREEZER PARTS CAUTION Use the part number to order part not the position number 45 ...

Page 46: ...ON Use the part number to order part not the position number 143E 143E 143E 140D 140D 140D 140B 140B 140B 140E 140E 140E 140B 142D 143F 142E S24 128B 128A 170A 167B 154A 155B 151A 151C 151A 103E 103E S24 S24 S24 S24 S24 S24 S24 46 ...

Page 47: ...0A 231A 233A 241A 241B 241E 241C 241D 286A 212G 244E 244A 286A 243A 205D 200A 201A 203A 281E 212A S27 EV DOOR PARTS CAUTION Use the part number to order part not the position number S27 283F 243A 286A 47 ...

Page 48: ...602A S28 600A 618A 627A 623C 616E S29 622B 600C 619A 619C 262D S31 EV WATER ICE MAKER PARTS CAUTION Use the part number to order part not the position number 48 ...

Page 49: ...September 2009 MFL62526004 ...

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