LG LRBP1031W Service Manual
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LG LRBP1031W Service Manual

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See also: Owner's Manual , User Manual
REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Ref. No.
GR-349SQF
GR-349STQ
MODEL: LRBP1031W
LRBP1031NI
http://Biz.lgservice.com
COLOR: EURO WHITE

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Summary of Contents for LG LRBP1031W

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Ref. No. GR-349SQF GR-349STQ MODEL: LRBP1031W COLOR: EURO WHITE LRBP1031NI...

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ............................... 2 SERVICING PRECAUTIONS..............................3 SPECIFICATIONS................................... 4 PARTS IDENTIFICATION ............................... 5 REPLACEMENT OF DOOR OPENING TYPE ........................6 DISASSEMBLY..................................7-8 DOOR....................................7 DOOR SWITCH..................................7 FAN AND FAN MOTOR................................ 7 DEFROST CONTROL ASSEMBLY............................8 LAMP....................................8 ADJUSTMENT................................... 9-10 COMPRESSOR..................................

  • Page 3: Servicing Precautions

    SERVICING PRECAUTIONS Air Recharging in Compressor vacuum operation is over, add the quantity in grams of R134a to the refrigeration system. Remember that every Test the refrigeration by connecting it electrically before system has an exact quantity of R134a with a tolerance of refilling operation.

  • Page 4: Specifications

    SPECIFICATIONS 1. Ref. No: GR-349**** ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 595(W) 626(D) 1710(H) Transparent Shelf (2 EA) NET WEIGHT (kg) REFRIGERATOR Vegetable Container (2 EA) COOLING SYSTEM Fan Cooling COMPARTMENT Vegetable Container Cover (1 EA) REFRIGERATOR Knob Dial Chilled Container (1 EA) TEMPERATURE CONTROL FREEZER...

  • Page 5: Parts Identification

    PARTS IDENTIFICATION Freezer Temperature Control Egg Tray (1) Rotatable Removable Door Basket Glass Shelf (2) Lamp Multi-air Flow Duct Fresh Meat Keeper Utility Corner Refrigerator (movable) Temperature Control Vegetable Drawer Used to keep fruits Bottle Holder and vegetables, etc. fresh and crisp. 2-liter Bottle Ice Cube Tray Door Basket...

  • Page 6: Replacement Of Door Opening Type

    REPLACEMENT OF DOOR OPENING TYPE 2) Remove bolt µ and remove the Hinge-C 1. PRECAUTION ¸ and the Fridge Door ¹. Move the 1) Before reversing the door, you should remove food and position of the cap . Move the position of bracket accessories like shelves or trays which are not fixed in door and screw...

  • Page 7: Disassembly

    DISASSEMBLY 1 DOOR 2 DOOR SWITCH 1) Loosen four screws in upper part and disconnect top Freezer Door 1) Loosen 2 screws and pull the Lower Cover. cover. 2) Loosen hexagonal bolts fixing the lower hinge to the 2) Disconnect Lead Wire from switch. body to remove the freezer door only.

  • Page 8: Defrost Control Assembly

    4 FAN AND FAN MOTOR 6 DAMPER CONTROL 1) Remove the Cover Lamp and loosen 2 screw. 1) Remove freezer drawers. 2) Pull the Control Box and separate the lead wire housing. 2) Remove two cap screws and loosen two screws in Grille Fan. 3) Remove the Cover Lamp.

  • Page 9: Adjustment

    ADJUSTMENT 1 COMPRESSOR 3) PTC-Applied Circuit Diagram According to Starting Method for the Motor 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 10: Olp (Overload Protector)

    3 OLP (OVER LOAD PROTECTOR) CONTACTING 1) Definition of OLP POINT COVER (1) OLP (OVER LOAD PROTECTOR) is attached to the hermetic compressor and protects the motor by cutting BIMETAL off current in compressor motor in case of over-rising temperature by Bimetal in the OLP. (2) When over-voltage flows to Compressor motor, the CONTACTING POINT...

  • Page 11: Troubleshooting

    TROUBLESHOOTING (Mechanical Part) 1 COMPRESSOR AND ELECTRIC COMPONENTS Power Remove the PTC- (Rating Voltage Source. Starter from the ±10%)? Compressor and measure the voltage between Terminal C of Compressor and Terminals 5 or 6 of PTC. No Voltage. OLP disconnected? Replace OLP.

  • Page 12: Ptc And Olp

    2 PTC AND OLP Normal operation of Check another Observation value is Separate the PTC-Starter Compressor is 220V/50Hz : 22Ω±30% electric from Compressor and 115V/60Hz : 6.8Ω±30% impossible or poor. components. measure the resistance 240V/50Hz : 33Ω±30% between No. 5 and 6 (only 127, 220V/60Hz : 22Ω...

  • Page 13: Other Electric Component

    3 OTHER ELECTRIC COMPONENTS No Cooling. Compressor Check if current flows to Cause. doesn't run. the following components. a. Thermistor Poor contacting. b. Starting devices Shorted or broken. Poor contacting c. OLP or shorted. d. Compressor coil Coil shorted. Replace Poor contacting e.

  • Page 14: Service Diagnosis Chart

    4 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY Cooling is • Is the power cord unplugged from the outlet? • Plug in to the outlet. impossible. • Check if the power switch is set to OFF. • Set the switch to ON. •...

  • Page 15: Refrigerating Cycle

    5 REFRIGERATING CYCLE Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE CAUSE REMARKS OF THE THE SET EVAPORATOR COMPRESSOR PARTIAL Freezer room and Low flowing sound of A little high • A little refrigerant LEAKAGE refrigerator refrigerant is heard and more than •...
  • Page 16 General Control of Refrigerating Cycle ITEMS CONTENTS AND SPECIFICATIONS REMARKS WELDING (1) H 30 • Chemical Ingredients • Recommend H34 containing 34% Ag in the (1) • Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20% • Service Center. • Brazing Temperature: 710~840°C (2) Bcup-2 •...

  • Page 17: Micom Function & Pcb Circuit Explanation

    MICOM FUNCTION & PCB CIRCUIT EXPLANATION This description is made for GR-349 & 389. Please refer to overall PCB circuits for other models. 1 FUNCTION EXPOSITION 1) FUNCTION (1) The refrigerator starts from optimum condition when electric power is first on. The operation condition changes Mid/Max Min/Mid Mid whenever you press the FREEZE TEMP button.
  • Page 18 4) DOOR OPENING ALARM (1) When the REFRIGERATOR DOOR is opened and isn't closed after 1 minute, the BUZZER sounds. (2) At frist, BUZZER sounds three times at each intervals of 0.5 second, then makes a 0.5 second ON/OFF alarm three times at intervals of 30 seconds.
  • Page 19 8) SELF-TEST (1) Function to make service easy in case of occuring a trouble in the product. (2) When a trouble occurs, the button is pushed, but the function doesn't operate. (3) If a problem releases during the representation of trouble, a refrigerator performs the normal function (RESET). (4) Error codes are displayed by FREEZE TEMP LEDs on TOP COVER.
  • Page 20 9) FUNCTION TEST (1) Function to check the testing function of PCB and refrigerator and to find where the trouble. (2) The test switch is on the MAIN PCB of refrigerator. TEST FUNCTION is released and RESET after MAX. 2 hours, regardless of TEST MODE. (3) If the buttons on TOP COVER is pushed during TEST MODE, Function is not operated and only BUZZER ring with DING~ DONG~ (4) After the end of TEST MODE, pull out the power cord and plug it in again (RESET).
  • Page 21 2 FUNCTION DESCRIPTION 1) ELECTRIC CIRCUITS TRANS secondary side is composed of electric power circuits for RELAY driving electricity (12Vdc) and for supplying electricity to MICOM and IC (5Vdc). The voltage in each part is as follows. PARTS both ends of VA1 both ends of CM1 both ends of CM2 both ends of CE2...
  • Page 22 4) LOAD/BUZZER OPERATION, DOOR OPENING SENSING CIRCUIT (1) LOAD OPERATION CHECK COMPRESSOR, KIND OF LOAD FAN MOTOR DEFROSTING HEATER COMPRESSOR COOLING FAN MEASURING POINT (IC5) No.13 No.14 No.15 below 1V STATE ƒUIf the DOOR-R is opened during FAN MOTOR is operated, FAN MOTOR is stopped immediately. ƒUThe A , B of DOOR S/W-R is connected DOOR OPEN DETECTION CIRCUIT as follow.
  • Page 23 (3) BUZZER OPERATION CHECK CONDITIONS DISPLAY FUNCTION BUTTON RING DOOR OPEN ALARM MEASURING (DING~ DONG~) (SCREECHING) POINT 0.05s 0.2s 0.1s 0.5s 0.5s IC1 (No.14 Pin) IC1 (No.13 Pin) 2.66kh 2.232kh 3.1kh z (DING~) z (DONG~) - 23 -...
  • Page 24 5) TEMP SENSOR CIRCUITS (RT– SENSOR) (DEFROST SENSOR) (FREEZER COMPARTMENT SENSOR) The above circuit reads the surrounding temperature, DEFROSTING temperature, and FREEZER ROOM temperature into MICOM (IC1). OPEN or SHORT state of each SENSOR is as follows. SENSOR CHECK POINT NORMAL (-30 °C~50 °C) SHORT OPEN...
  • Page 25 7) TEMPERATURE COMPENSATION FREEZER TEMPERATURE COMPENSATION FREEZER ROOM REMARKS RESISTANCE VALUES(R1) TEMPERATURE COMPENSATION 180 kΩ + 5.0°C COMPENSATE WARMLY 56 kΩ +4.0°C 33 kΩ +3.0°C 18 kΩ +2.0°C 12 kΩ +1.0°C 10 kΩ 0°C STANDARD 8.2 kΩ -1.0°C 5.6 kΩ -2.0°C 3.3 kΩ...
  • Page 26 • TEMPERATURE COMPENSATION OF FREEZER ROOM Revi s ed resi s tance 470 Ω 2 kΩ 3.3 kΩ 5.6 kΩ 8.2 kΩ 10 kΩ 12 kΩ 18 kΩ 33kΩ 56 kΩ 180 kΩ Present resi s tance °C↑ 2 °C↑ 3 °C↑...
  • Page 27 8) LIGHTING CIRCUITS OF KEY BUTTON INPUT AND DISPLAY PARTS FREEZER TEMP CONTROL KEY DISPLAY PART The above circuit is to judge the operation conditions of function key and to light each function indicating LED. It is operated by SCAN method. - 27 -...
  • Page 28 3. SENSOR RESISTANCE CHARACTERISTICS TABLE MEASURED TEMPERATURE RESISTANCE OF FREEZER SENSOR RESISTANCE OF DEFROST SENSOR, ROOM TEMPERATURE SENSOR -20°C 22.3kΩ 77kΩ -15°C 16.9kΩ 60kΩ -10°C 13.0kΩ 47.3kΩ -5°C 10.1kΩ 38.4kΩ 0°C 7.8kΩ 30kΩ +5°C 6.2kΩ 24.1kΩ +10°C 4.9kΩ 19.5kΩ +15°C 3.9kΩ...

  • Page 29: Main Pwb Assembly And Parts List

    4. MAIN PWB ASSEMBLY AND PARTS LIST 1) MAIN PWB ASSEMBLY 6871JB1037 D1 D3 D4 D2 STICKER TRANS BUZZER R4 R18 R3 CC10 OSC1 J02 R7 J04 98 12 TEST COMP F-FAN D-HEATER RT-SENSOR CON2 CON1 CON3 R-DOOR - 29 -...

  • Page 30: Replacement Parts List

    2) REPLACEMENT PARTS LIST - 30 -...
  • Page 31 3) PWB ASSEMBLY, DISPLAY AND PARTS LIST - 31 -...
  • Page 32 PWB circuit drawing- The PWB circuit drawing may change without notice. - 32 -...
  • Page 33 - 33 -...

  • Page 34: Exploded View

    EXPLODED VIEW & REPLACEMENT PARTS LIST 1.Ref. No : GR-349**** 102A 103B 114A 103A 503B 102B 281B 120H 109C 406B 281F 120E 120B 501A 409B 120D 120A 120C 405C 304A 404A 282B 405A 604F 401A 329A 301A 330B 610E 332A 109A 105A 108A...
  • Page 35 230A 233A 231A 235A 136E 241A 249B 241A 249C 136F 249A 140A 237A 155A 210A 241C 151A 200A 151B 125A 203A 201A 136A 281D 136B 136C 136D 210A - 35 -...
  • Page 36 P/No. 3828JD8351K JUN., 2001 Printed in Korea...

This manual is also suitable for:

Lrbp1031niGr-389Gr-349

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