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LG LRTBC1825T Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODEL : LRTBC1825T
LRTBC2025T
http://biz.lgservice.com
COLOR: TITANIUM

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  Summary of Contents for LG LRTBC1825T

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MODEL : LRTBC1825T COLOR: TITANIUM LRTBC2025T...
  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ............................... 2 SERVICING PRECAUTIONS..............................3 SPECIFICATIONS................................... 4 PARTS IDENTIFICATION ............................... 5 DISASSEMBLY..................................6-7 DOOR....................................6 DOOR SWITCH..................................6 THERMOSTAT ..................................6 FAN AND FAN MOTOR................................ 7 DEFROST CONTROL ASSEMBLY............................7 LAMP....................................7 CONTROL BOX-R................................7 ADJUSTMENT..................................8 COMPRESSOR..................................
  • Page 3: Servicing Precautions

    SERVICING PRECAUTIONS AIR RECHARGING IN COMPRESSOR vacuum operation is over, add the quantity in grams of R-134a to the refrigeration system. Remember that every Test the refrigeration system connecting it electrically before system has an exact quantity of R-134a that can be added refilling operation.
  • Page 4: Specifications

    1. SPECIFICATIONS 1. Ref. No.: LRTBC1825T ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DOOR DESIGN All Rounded VEGETABLE TRAY Transparent Drawer Type DIMENSIONS (mm) 754.5 1732 (W COMPRESSOR PTC Starting Type NET WEIGHT (kg) EVAPORATOR Fin Tube Type COOLING SYSTEM Fan Cooling CONDENSER...
  • Page 5: Parts Identification

    2. PARTS IDENTIFICATION FREEZER COMPARTMENT Freezer Shelf Lamp Automatic Ice Maker Freezer Door Bin Ice Cube Box Freezer Temperature Door Cooling Control Dial On the refrigerator door, the cold air passageway is REFRIGERATOR installed to supply cold air to the doorside of COMPARTMENT the refrigerator compartment.
  • Page 6: Disassembly

    3. DISASSEMBLY 3-1 DOOR 3-2 DOOR SWITCH 1. To remove the door switch, pull out it with a slotted type Freezer Door 1. Remove the hinge cover by pulling it upwards. driver as shown in (figure 9). 2. Loosen hexagonal bolts fixing the upper hinge to the 2.
  • Page 7: Fan And Fan Motor

    3-4 FAN AND FAN MOTOR 3-6 LAMP 1. Remove the freezer shelf. (If your refrigerator have an Ice Maker, disassemble the Ice maker first) REFRIGERATOR ROOM LAMP 2. Remove the grille by pulling it out and by loosening a screw. 3.
  • Page 8: Adjustment

    4. ADJUSTMENT 4-1 COMPRESSOR 4-2-3 PTC-Applied Circuit Diagram According to Starting Method for the Motor 4-1-1 Role The compressor intakes low temperature and low pressure gas evaporated from evaporator of the refrigerator, and OVERLOAD PROTECTOR(O.L.P) condenses this gas to high temperature and high pressure gas, and then plays delivering role to condenser.
  • Page 9: Overload Protector

    (2) Do not turn the Adjust Screw of the OLP in any way for SCREW normal operation of the OLP. (Composition and connection diagram of OLP) Figure 21 HEATER 5. CIRCUIT DIAGRAM Ref. No.: LRTBC1825T Ref. No.: LRTBC2025T - 9 -...
  • Page 10: Troubleshooting

    6. TROUBLESHOOTING 6-1 COMPRESSOR AND ELECTRIC COMPONENTS Remove the PTC- (Rating Voltage Power Source. Starter from the ±10%)? Compressor and measure the voltage between Terminal C of Compressor and Terminals 5 or 6 of PTC. OLP disconnected? No Voltage. Replace OLP. Check connection condition.
  • Page 11: Positive Temperature Coefficient And Overload Protector

    6-2 PTC AND OLP Normal operation of Check another Separate the PTC- Observation value is Compressor is Starter from electric components. 220V/50Hz : 22Ω±30% Compressor and impossible or poor. 115V/60Hz : 6.8Ω±30% measure the 240V/50Hz : 33Ω±30% resistance between 127, 220V/60Hz : 22Ω No.
  • Page 12: Other Electric Components

    6-4 OTHER ELECTRIC COMPONENTS Cooling is impossible Compressor Check if current flows to Cause doesn't run. the following components. Poor contacting and a. Thermostat gas leakage. b. Starting devices Shorted or broken. Poor contacting c. OLP or shorted. Coil shorted. d.
  • Page 13: Service Diagnosis Chart

    6-4 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY Cooling is • Is the power cord unplugged from the outlet? • Plug to the outlet. impossible. • Check if the power S/W is set to OFF. • Set the switch to ON. •...
  • Page 14: Refrigerating Cycle

    6-5 REFRIGERATING CYCLE Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE CAUSE REMARKS OF THE THE SET EVAPORATOR COMPRESSOR PARTIAL Freezer Low flowing sound of A little higher • Refrigerant level is low due LEAKAGE compartment and Refrigerant is heard and than ambient •...
  • Page 15 General Control of Refrigerating Cycle ITEMS UNIT STANDARDS PURPOSES REMARKS Pipe and Min. Pipe: within 1 hour. To protect The opening time should be reduced piping system Comp: within 10 minutes. moisture to a half of the standards during rain opening time Drier: within 20 minutes.
  • Page 16: Operation Principle And Repair Method Of Ice Maker

    7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICE MAKER This manual describes function of models adhering Ice Maker. 7-1 OPERATION PRINCIPLE 7-1-1 Operation principle of Ice Maker Power Input Initial Control • Keep a level of ice-removing tray with “initial control” inputting power.
  • Page 17 7-2 Function of Ice maker 7-2-1 Initial control function 1. The level of the ice-removing tray (ice-removing container) after completing the MICOM initialization in the initial POWER ON,returning to electricity failure and turning-off of ice-making stop switches. Namely, detection lever operates up and down. 2.
  • Page 18 7-2-4 Ice-removing control function 1. Ice-removing control means operation to separate ice within ice-making tray ( ice-making container) after ice-making is completed. 2. Step to check ices stored at the ice bank (container for storing ice) are fully filled. It is considered as they are fully filled if signals of the hall sensor are at the On status (“high”) before 3.6seconds after rotating positively the ice-making motor.
  • Page 19 7-2-5 Test Function 1. Function used compulsory operation for the purpose of performing operation test, service and cleaning. This test function is performed if pressing the test switch mounted on the automatic ice-maker itself for 0.5 second or more. 2. The test button operates when the test function is not input but at the level status. It does not perform ice-removal control and water supply control if ices are full during operation of test function 3.
  • Page 20 7-3 Failure diagnosis method of ice maker Replacement of DC power (5V,12V) is Defect of power terminal MAIN PCB normally output? • Check DC power (5V,12V) Normally perform ice-removing and returning to Replacement of Defect of ice-making sensor the level if pressing TEST S/W ice-making sensor for more than 0.5 •...
  • Page 21 7-4 Explanation of ice maker circuits 7-4-1 Power circuit The secondary party of transformer consists of power (12Vdc) for driving display and relay and power (5Vdc) supplying power to MICOM and IC. In this case, voltage at each part is as follows: Part Both ends of VA1 Both ends of CE2...
  • Page 22 7-4-4 Load drive circuit 1. Load drive status check Load Type Water Valve Measurement Location 1V below Condition - 22 -...
  • Page 23 7-4-5 ICE MAKER drive/circuit This circuit is a circuit used to embody functions such as ice-removing, full-ice detection, level noise, and ice-making tem- perature detection of ice-making tray (ice-making container). - 23 -...
  • Page 24 7-5 Main PWB Assembly and Parts List 7-5-1 MAIN PWB - 24 -...
  • Page 25 7-5-2 Replacement Part List - 25 -...
  • Page 26 7-6 PWB DIAGRAM - 26 -...
  • Page 27 - 27 -...
  • Page 28: Exploded View

    8. EXPLODED VIEW & REPLACEMENT PARTS LIST The parts of refrigerator and the shape of each part are subject to change in different localities. 401A Capacitors and fuse are optional parts. 103B GR-T622, GR-T722 281A 301A 281B 103A 282E 418A 411A 282C 120A...
  • Page 29 : Option 405C 330B 405A 404A 329A 332A 158B 406A 110C 409A 408A 149A 140A 140E 140B 140D 141A 141E 141B 147C 141D 147A 170A 154A 151C 151D 151A 151C 151D 151B - 29 -...
  • Page 30 205A Handle Assembly, 211A 200A Package 203A 201A 1SZZ0A 212G 244B 205A 281E 607A 212A 241B 210A 607A 244C 230A 233A 231A 241A 1SZZ0A 241C 244B 607A 281E 241C 244A 241C 241D 243A 607A 244C - 30 -...
  • Page 31 ICE MAKER PART 618A 622A 616E 616D 623A 600A 619A 620A 602A 611A 605A 604A 603B 601A 5074AA 603A 6923 - 31 -...
  • Page 32 RUN-DATE: 02-07-26 BUYER NAME:LGEUS MODEL NAME:LRTBC1825T LG REFERENCE NO:GR-T622ATC.ATICLGX COLOR:TITANIUM S AL LOCA.NO PART NO(LG) DESCRIPTION SPECIFICATION REMARK 6923 6923JB1001A MICOM ASSEMBLY 103A 3650JA2004U HANDLE,BACK 103B 3650JA2004V HANDLE,BACK 103C 3551JA2082D COVER ASSEMBLY,LOWER 104A 4441JA3001A CASTER ASSEMBLY 105A 5250JA2009A DRAIN,PIPE-Z 106A...
  • Page 33 RUN-DATE: 02-07-26 BUYER NAME:LGEUS MODEL NAME:LRTBC1825T LG REFERENCE NO:GR-T622ATC.ATICLGX COLOR:TITANIUM S AL LOCA.NO PART NO(LG) DESCRIPTION SPECIFICATION REMARK 212G 4140JD2001C NAME PLATE,P(H) 230A 3581JA8475C DOOR ASSEMBLY,R 231A 5433JA0077L DOOR FOAM ASSEMBLY,R 233A 4987JA1024B GASKET ASSEMBLY,DOOR 241A 5004JD1119A BASKET,DOOR 241B 5005JA1001B...
  • Page 34 RUN-DATE: 02-07-26 BUYER NAME:LGEUS MODEL NAME:LRTBC1825T LG REFERENCE NO:GR-T622ATC.ATICLGX COLOR:TITANIUM S AL LOCA.NO PART NO(LG) DESCRIPTION SPECIFICATION REMARK 401A 6615JB2003F CONTROLLER ASSEMBLY 404A 4681JB1011P MOTOR ASSEMBLY,REF FAN 405A 4810JA3007A BRACKET,MOTOR 405C J756-00008B RUBBER,MOTOR-N 406A 6600JB1005C SWITCH,[PUSH] 406B 6600JB1002K SWITCH,[PUSH] 408A...
  • Page 35 RUN-DATE: 02-07-26 BUYER NAME:LGEUS MODEL NAME:LRTBC2025T LG REFERENCE NO:GR-T722ATC.ATICLGX COLOR:TITANIUM S AL LOCA.NO PART NO(LG) DESCRIPTION SPECIFICATION REMARK 6923 6923JB1001A MICOM ASSEMBLY 103A 3650JA2004U HANDLE,BACK 103B 3650JA2004V HANDLE,BACK 103C 3551JA2082D COVER ASSEMBLY,LOWER 104A 4441JA3001A CASTER ASSEMBLY 105A 5250JA2009A DRAIN,PIPE-Z 106A...
  • Page 36 RUN-DATE: 02-07-26 BUYER NAME:LGEUS MODEL NAME:LRTBC2025T LG REFERENCE NO:GR-T722ATC.ATICLGX COLOR:TITANIUM S AL LOCA.NO PART NO(LG) DESCRIPTION SPECIFICATION REMARK 211A 3651JA2212A HANDLE ASSEMBLY,PACKAGE 212A 3650JA2053A HANDLE,F 212G 4140JD2001C NAME PLATE,P(H) 230A 3581JA8475C DOOR ASSEMBLY,R 231A 5433JA0077L DOOR FOAM ASSEMBLY,R 233A 4987JA1024B...
  • Page 37 RUN-DATE: 02-07-26 BUYER NAME:LGEUS MODEL NAME:LRTBC2025T LG REFERENCE NO:GR-T722ATC.ATICLGX COLOR:TITANIUM S AL LOCA.NO PART NO(LG) DESCRIPTION SPECIFICATION REMARK 334A 3550JA2095A COVER,PIPE 334B 5040JA3039A BUSHING,PIPE 401A 6615JB2003F CONTROLLER ASSEMBLY 404A 4681JB1011P MOTOR ASSEMBLY,REF FAN 405A 4810JA3007A BRACKET,MOTOR 405C J756-00008B BUSHING,MOTOR-N 406A...
  • Page 38 P/No. 3828JD8332Y JUL., 2002 Printed in Korea...

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