LG GR-B218JTA Service Manual
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LG GR-B218JTA Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
GR-B218JTA
MODEL:
http://biz.lgservice.com
COLOR: TITANIUM

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Summary of Contents for LG GR-B218JTA

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. COLOR: TITANIUM GR-B218JTA MODEL:...

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ............................... 2 SPECIFICATIONS................................... 3 PARTS IDENTIFICATION ............................... 4 DISASSEMBLY..................................5-7 DOOR....................................5-6 FAN AND FAN MOTOR................................ 7 DEFROST CONTROL ASSEMBLY............................7 LAMP....................................7 CONTROL BOX-REFRIGERATOR ............................7 MULTI DUCT ..................................7 ADJUSTMENT..................................8-9 COMPRESSOR..................................8 PTC-STARTER..................................8 OLP (OVERLOAD PROTECTOR)............................

  • Page 3: Specifications

    1. SPECIFICATIONS GR-B218 / GR-B258 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS VEGETABLE TRAY Opaque Drawer Type DOOR DESIGN Side Rounded 908(W)X763(D)X1771(H) 21cu.ft COMPRESSOR PTC Starting Type DIMENSIONS (mm) 908 (W) X 869 (D) X 1771 (H) 25cu.ft EVAPORATOR Fin Tube Type 137kg (21cu.ft) CONDENSER Wire Condenser NET WEIGHT (Kg)

  • Page 4: Parts Identification

    2. PARTS IDENTIFICATION Digital Sensor Control Dairy Bin(option) Refrigerator Light Egg Box(option) Shelves Design-A-Door Design-A-Door Wine Holder(option) Optibin Crisper Keeps fruits and vegetable fresh Design-A-Door and crisp Glide N Serve Customcube Icemaker (option) Ice Bin Pull out Drawer Durabase Freezer Door Rack Divider (25cuft.

  • Page 5: Disassembly

    3. DISASSEMBLY 3-1 DOOR Refrigerator Door 1. Remove the top hinge cover and disconnect the wire Gasket harness. Door Bracket Clip 2. Remove the earth screw. Frame 3. Rotate the lever hinge and lift off hinge. 4. Lift off the refrigerator door. Flat Tip Screwdriver 5.
  • Page 6 2. Insert gasket into channel 3-2 DOOR ALIGNMENT 1) Snap gasket assembly into the door bracket. If the space between your doors is uneven, follow the <Inserting the Gasket Assembly into the Bracket Door> instructions below to align the doors: 1.

  • Page 7: Fan And Fan Motor

    3-2 FAN AND FAN MOTOR 3-4-1 Refrigerator Compartment Lamp 1. Remove the freezer shelf. (If your refrigerator has an 1. Unplug the power cord from the outlet. icemaker, remove the icemaker first) 2. Remove refrigerator shelves. 2. Remove the plastic guide for slides on left side by 3.

  • Page 8: Adjustment

    4. ADJUSTMENT 4-1 COMPRESSOR 4-2-3 PTC-Applied Circuit Diagram Starting Method for the Motor 4-1-1 Role The compressor intakes low temperature and low pressure gas from the evaporator of the refrigerator and compresses OVERLOAD PROTECTOR this gas to high-temperature and high-pressure gas. It then delivers the gas to the condenser.

  • Page 9: Olp (Overload Protector)

    4-3 OLP (OVERLOAD PROTECTOR) 4-4 TO REMOVE THE COVER PTC 4-3-1 Definition of OLP (1) OLP (OVERLOAD PROTECTOR) is attached to the Compressor and protects the Motor by opening the circuit to the Motor if the temperature rises and activating the bimetal spring in the OLP. (2) When high current flows to the Compressor motor, the Bimetal works by heating the heater inside the OLP, and the OLP protects the Motor by cutting off the...

  • Page 10: Circuit Diagram

    5. CIRCUIT DIAGRAM BETTER MODEL - 10 -...

  • Page 11: Troubleshooting

    6. TROUBLESHOOTING 6-1 COMPRESSOR AND ELECTRIC COMPONENTS (Rated Voltage Remove PTC-Starter Power Source. ±10%)? from Compressor and measure voltage between Terminal C of Compressor and Terminal 5 or 6 of PTC. OLP disconnected? No Voltage. Replace OLP. Check connection condition. Reconnect.

  • Page 12: Ptc And Olp

    6-2 PTC AND OLP Normal operation of Separate PTC-Starter Observation value is Compressor is from Compressor and 115V/60Hz : 6.8Ω±30% measure resistance impossible or poor. between No. 5 and 6 of PTC-Starter with a Tester. (Figure 18) Replace PTC- The resistance value Starter.

  • Page 13: Other Electrical Components

    6-3 OTHER ELECTRICAL COMPONENTS M Not cooling at all Check for open short or Compressor Cause incorrect resistance readings doesn't run. in the following components a. Starting devices Short, open, or broken. Poor contact b. OLP or shorted. Coil open or shorted. c.

  • Page 14: Service Diagnosis Chart

    6-4 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY No Cooling. • Is the power cord unplugged from the outlet? • Plug into the outlet. • Check if the power switch is set to OFF. • Set the switch to ON. •...

  • Page 15: Refrigeration Cycle

    6-5 REFRIGERATION CYCLE M Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE CAUSE REMARKS OF THE THE UNIT 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 16 6-5-1 SEALED SYSTEM DIAGNOSIS “Not Cooling” Complaint All components operating, No airflow problems, Not frosted up as a defrost problem problem has been isolated to sealed system area Frost None Partial Pattern? Equalization Equalization Test Test Very Fast Very Slow Very Slow Fast Very Fast...

  • Page 17: Operation Principle & Repair Method Of Icemaker

    7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER (OPTION) 7-1 OPERATION PRINCIPLE 7-1-1 Operation Principle of IceMaker Power On Start Position • Adjusts EJECTOR to Start Position with power on. Ice Making • Waits until water becomes cold after starting the Mode ice making operation.
  • Page 18 7-2 ICE MAKER FUNCTIONS 7-2-1 Start Position 1. After POWER OFF or Power Outage, check the EJECTOR's position with MICOM initialization to restart. 2. How to check if it is in place: - Check HIGH/LOW signals from HALL SENSOR in MICOM PIN. 3.
  • Page 19 7-2-4 Fill / Park Position 1. Once a normal harvest mode has been completed, the water solenoid will be activated. 2. The amount of water is adjusted by pressing the Fill Key repeatedly. This changes the time allowed for fill as illustrated in the table below.
  • Page 20 7-2-5 Function TEST 1. This is a compulsory operation for TEST, SVC, cleaning, etc. It is operated by pressing and holding the Fill Key for 3 seconds. 2. The test works only in the Ice Making Mode. It cannot be entered from the Harvest or Fill mode. (If there is an ERROR, it can only be checked in the TEST mode.) 3.

  • Page 21: Description Of Function & Circuit Of Micom

    8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM 8-1 FUNCTION 8-1-1 Function 1. When the appliance is plugged in, it is set to 3°C for Refrigerator and -18°C for freezer. You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button. 2.
  • Page 22 8-1-5 Alarm for Open Door 1. This feature sounds a buzzer when the freezer or refrigerator door is not closed within 1 minute after it is opened. 2. One minute after the door is opened, the buzzer sounds three times each for 1/2 seconds. These tones repeat every 30 seconds.
  • Page 23 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 TEST is completed.
  • Page 24 8-1-9 Defect Diagnosis Function 1. Automatic diagnosis makes servicing the refrigerator easy. 2. When a defect occurs, the buttons will not operate; but the tones. such as ding. will sound. 3. When the defect CODE removes the sign, it returns to normal operation (RESET). 4.
  • Page 25 8-1-10 TEST Mode 1. The Test mode allows checking the PCB and the function of the product as well as finding out the defective part in case of an error. 2. The test mode is operated by pressing two buttons at Display panel. 3.
  • Page 26 8-2 PCB FUNCTION 8-2-1 Power Circuit The secondary part of the TRANSFORMER is composed of the power supply for the display, the BLDC FAN Motor drive (15.5 V), the relay drive (12 Vdc) and the MICOM and IC (5 Vdc). The voltage for each part is as follows: PART VA 1...
  • Page 27 8-2-2 Oscillation Circuit This circuit generates the base clock for calculating time and the synchro clock for transmitting data from and to the inside logic elements of the IC1 (MICOM). Be sure to use specified replacement parts, since calculating time by the IC1 may be changed.
  • Page 28 8-2-4 Load / Buzzer Drive & Open Door Detection Circuit 1. Load Drive Condition Check FRENCH DOOR DEFROSTING COMP LAMP LOAD TYPE HEATER 1, 2 / HEATER DEW HEATER Measurement Location (IC6) NO.12 NO.14 NO.15 NO.13 1V or below Condition 2.
  • Page 29 2. Buzzer Drive Condition Check Condition Tone (Ding~Dong~) when the button on Alarm for open door Measure- the display is pushed. (beep-beep-beep) ment Location 0.05 s 0.2 s 0.1 s 0.5 s 0.5 s IC1 ( 2.63 kz (Ding~) 2.21 kz (Dong~) IC1 ( 2.63 kz (Beep~) 3.
  • Page 30 8-2-5 Temperature Sensor Circuit The upper CIRCUIT reads REFRIGERATOR temperature, 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)
  • Page 31 8-2-7 Key Button Input & Display Light-On Circuit ➧ 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 (LED Module) SEVEN SEGMENT DISPLAY (SEVEN SEGMENT DISPLAY MODULE).
  • Page 32 8-3 RESISTANCE SPECIFICATION OF SENSOR RESISTANCE OF FREEZER RESISTANCE OF REFRIGERATOR & TEMPERATURE 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...
  • Page 33 - 33 -...
  • Page 34 - 34 -...
  • Page 35 8-5 MAIN PWB ASSEMBLY AND PARTS LIST 8-5-1 Main PWB Assembly - 35 -...
  • Page 36 8-5-2 Replacement Parts List - 36 -...
  • Page 37 8-5-3 PWB Assembly, Display, And Parts List SW106 - 37 -...
  • Page 38 8-6 PWB DIAGRAM 8-6-1 PWB Main Assembly - 38 -...
  • Page 39 - 39 -...

  • Page 40: Exploded View & Replacement Parts List

    #EV# 9. EXPLODED VIEW & REPLACEMENT PARTS LIST CASE PARTS CAUTION: Use the part number to order part, not the position number. 207B 402A 103B 406C 271C 271B 103A 624C 410A 207A 409D 624A 624B 406D 501F 402A 624D 271B 271A 610B 282F...
  • Page 41 #EV# FREEZER PARTS CAUTION: Use the part number to order part, not the position number. 145C 136B 145F 248F 131A 237C 177B 136A - 41 -...
  • Page 42 #EV# REFRIGERATOR PARTS CAUTION: Use the part number to order part, not the position number. 147C 141B 141A 147B 147A 141B 141C 141A 141B 141A 141C 141B 141A 141C 146A 161E 141D 141C 161A 167B 154A 161D 160B 151C 151A 161C 248A 155J...

  • Page 43: Door Parts

    #EV# DOOR PARTS CAUTION: Use the part number to order part, not the position number. 230B 230A 231B 233B 233C 233D 233A 231A 241A 241B 212G 241C 237A 241C 244D 237A 244E 244D 241C 244E 241C 241C 243A 243A 243B 243B 249A 262C...
  • Page 44 #EV# ICE & MAKER PARTS (option) CAUTION: Use the part number to order part, not the position number. 131E 131B 602A 131C 131D 600A 131J 616E 623A 623B 627B 619A : on some models - 44 -...
  • Page 45 P/No. 3828JL8068N APR., 2005 Printed in Korea...

This manual is also suitable for:

Gr-b218jvaGr-b258jva

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