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LG GR-642APA Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
MODEL: GR-642APA
Ref.No.
GR-642AVPA
http://biz.lgservice.com
COLOR : SUPER WHITE

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  Summary of Contents for LG GR-642APA

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL. Ref.No. GR-642AVPA MODEL: GR-642APA COLOR : SUPER WHITE...
  • Page 2: Table Of Contents

    CONTENTS CONTENTS..................................... 2 SERVICING PRECAUTIONS..............................3 SPECIFICATIONS................................... 4 PARTS IDENTIFICATION ............................... 5 DISASSEMBLY..................................6-7 DOOR....................................6 DOOR SWITCH..................................6 FAN AND FAN MOTOR................................ 6 DEF' CONTROL ASM ................................7 LAMP....................................7 CONTROL BOX-R................................7 ADJUSTMENT..................................8-9 COMPRESSOR..................................8 PTC-STARTER..................................8 OLP (OVER LOAD PROTECTOR)............................
  • Page 3: Servicing Precautions

    SERVICING PRECAUTIONS Air Recharging in Compressor vacuum operation is over, add the quantity in grams of R-134a to the refrigerant system. Remember that every Test the refrigeration by connecting it electrically before system has an exact quantity of R-134a with a tolerance of refilling operation.
  • Page 4: Specifications

    1. SPECIFICATIONS 1-1. GR-642 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS FREEZER FREEZER 1 EA SHELF NET CAPACITY REFRIGERATOR REFRIGERATOR 2 EA ( l ) TOTAL VEGETABLE TRAY Drawer Type DIMENSIONS (mm) 860(W) 709(D) 1794(H) EGG TRAY 2 Pieces NET WEIGHT (kg) ICE TRAY 2 Pieces (Plastic) COOLING SYSTEM Fan Cooling...
  • Page 5: Parts Identification

    2. PARTS IDENTIFICATION 2-1. FEATURE CHART FREEZER COMPARTMENT Lamp Shelf Freezer Temperature Freezer Temperature Control Dial Control Dial Twisting Ice Serve(Option) Freezer Door Rack General Type Ice Making REFRIGERATOR Egg Storage Rack COMPARTMENT Water Dispenser Deodorizer Utility Corner Fresh Meat Lamp Snack Corner Shelves...
  • Page 6 2-2 WATER DISPENSER Putting The Water In The Water Tank 1. Turn the lock dial in the Features direction of the arrow as shown to remove it and pour water into the dispenser water tank. DISPENSER 2. Close the cap by tilting it GRILLE and putting one side in first and then the other side as...
  • Page 7 Cleaning Water Tank 1. Remove the cap. Grille and Drip Tray 1. Pull the drip tray out and remove with the grille. 2. Dispose of the water in the kitchen sink, wash the drip 2. Clean the inside and outside of the water tank with tray and the grille with a dishwashing detergent and rinset horoughly under mild detergent and rinse...
  • Page 8: Disassembly

    3. DISASSEMBLY 3-1 DOOR 3-2 DOOR SWITCH Freezer Door 1. To remove the door switch, pull out it with a '—' type 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 9: Def' Control Asm

    3-4 DEF' CONTROL ASSY 3-5-1 Freezer room lamp 1. Unplug the power cord from the outlet. Def control ASM consists of Defrost Sensor and FUSE–M. 2. Remove the room lamp lid by taking down while pulling Defrost Sensor functions to defrost automatically and it is it forward with your hand after inserting finger into the attached to the Evaporator and the metal side of the case inside hole as shown in (figure 16).
  • Page 10: Adjustment

    4. ADJUSTMENT 4-1 COMPRESSOR 4-2-3 PTC-Applied Circuit Diagram According to Starting Method of Motor 4-1-1 Role The compressor inhales low temperature and low pressure gas evaporated from Evaporator of the Refrigerator, and OVERLOAD PROTECTOR condenses this gas to high temperature and high pressure gas, and then plays delivering role to Condenser.
  • Page 11: Olp (Over Load Protector)

    4-3 OLP (OVER LOAD PROTECTOR) CONTACTING POINT 4-3-1 Definition of OLP COVER (1) OLP (OVER LOAD PROTECTOR) is attached to Hermetic Compressor and protects Motor by cutting off BIMETAL current in Compressor Motor by Bimetal in the OLP in case of over-rising temperature. CONTACTING (2) When over-voltage flows to Compressor motor, Bimetal POINT...
  • Page 12: Troubleshooting

    6. TROUBLESHOOTING 6-1 COMPRESSOR AND ELECTRIC COMPONENTS (Rating Voltage Remove the PTC-Starter Power Source. ±10%)? from the Compressor and measure the voltage between Terminal C of Compressor and Terminals 5 or 6 of PTC. No Voltage. OLP disconnected? Replace OLP. Check connection condition.
  • Page 13: Ptc And Olp

    6-2 PTC AND OLP Check another Normal operation of Separate the PTC from Observation value is electric components. Compressor is 220V/50Hz : 47Ω ± 30% Compressor and impossible or poor. 220 - 240V/50Hz : 47Ω ± 30% measure the resistance 110 -115V/60Hz : 6.8Ω...
  • Page 14: Another Electric Component

    6-3 ANOTHER ELECTRIC COMPONENTS M Cooling is impossible 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 15: 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 16: Refrigerating Cycle

    6-5 REFRIGERATING CYCLE M Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE CAUSE REMARKS OF THE THE SET EVAPORATOR COMPRESSOR PARTIAL Freezer and Low flowing sound of A little high • A little Refrigerant LEAKAGE Refrigerator Refrigerant is heard and more than •...
  • Page 17 M 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 18: Description Of Function & Circuit Of Micom

    7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM The following description is basically for GR-642P/GR-702P. For the other models, refer to the diagram of the entire PCB circuit. 7-1 FUNCTION 7-1-1 FUNCTION 1. When the appliance is plugged in, it is set to ‘Medium’. Each time the button is pushed, it is set to ‘Medium’¡’Medium/High’¡’High’¡’Low’¡’Medium/Low’¡’Medium’...
  • Page 19 7-1-2 SUPER COOL 1. This feature is to shorten the cooling time of the refrigerator by keeping the comp, fan running for a while. When the Super Cool button is pushed, the Super Cool LED turns on in order and the comp keeps on running. In 2 hours, the Super Cool mode will be cleared.
  • Page 20 7-1-6 BUZZER SOUND 1. When the button on the front Display is pushed, “Ding-” sound is produced and it works as follows. 7-1-7 CONTROL OF DOUBLE COOLING FAN IN THE REFRIGERATOR COMPARTMENT. 1. To raise the refrigerating speed, fan motor in the refrigerator compartment is operated when the door of freezer room or refrigerator room is opened and then closed.
  • Page 21 7-1-10 ERROR DIAGNOSTIC MODE 1. The error diagnostic mode allows the SVC when a fault that may affect the performance of the product occurs while operating the product. 2. Even if the function control button is pushed when an error occurs, the function will not be performed. However, the recognition tone (beep~) sounds.
  • Page 22 7-1-11 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 button is on the main PCB of the refrigerator (Test S/W). The test mode will be cleared in 2 hours regardless of the type of the test mode and then reset.
  • Page 23 7-2 PCB FUNCTION 7-2-1 POWER CIRCUIT TRANS 2nd part is composed of the RELAY-operating POWER(12Vdc) and power (5Vdc) supplying POWER to MICOM and IC. TRANS 2nd part is composed of the CIRCUIT supplying POWER(12Vdc) to DISPENSER PUMP MOTOR. Voltage of each part is as follows. PART PART both ends of VA1...
  • Page 24 7-2-2 OSCILLATION CIRCUIT This circuit is to generate 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 the authentic parts since the calculating time by the IC1 may be changed or it will not work if the OSC1 SPEC is changed.
  • Page 25 7-2-4 LOAD/BUZZER DRIVE & OPEN DOOR DETECTION CIRCUIT 1. Load Drive Condition Check Double cooling Freezer Fan Freezer Fan Defrosting COMP Lamp Fan Motor R-Lamp Load Type Motor HIGH Motor Heater (R-FAN) Standard RPM Measurement Location (IC5) NO.16 NO.12 NO.10 NO.15 NO.14 NO.13...
  • Page 26 2. Buzzer Drive Condition Check Condition Tone (Beep~) when the button on the display is pushed Alarm for open door (beep-beep-beep) Measure- ment Location 0.1 s 0.5 s 0.5 s 0.5 s IC1 ( 1.9 kH (Beep~) IC1 ( 1.9 kH (Beep~) 3.
  • Page 27 7-2-5 TEMPERATURE SENSOR CIRCUIT The upper CIRCUIT reads FREEZER and REFRIGERATOR temperature, and DEF-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 28 7-2-6 SWITCH INPUT CIRCUIT * The circuit shown below is the input circuit to detect the signals of the test S/W for checking the refrigerator. 7-2-7 TEMPERATURE COMPENSATION & OVERCOOLING/UNDERCOOLING COMPENSATION CIRCUIT 1. The circuits for less cooling and overcooling compensation in a refrigerator compartment OVER COOLING LESS COOLING REFRIGERATOR TEMPERATURE...
  • Page 29 7-2-8 KEY BUTTON INPUT & DISPLAY LIGHT ON CIRCUIT ➧ The circuit shown above is to determine whether a function control key on the operation display is pushed and to turn on the corresponding function indication LED (LED Module). The drive type is the scan type. - 29 -...
  • Page 30 7-2-9 DISPENSER PUMP MOTOR OPERATION CIRCUIT(OPTION) Press the DISPENSER PUMP S/W, the MOTOR turns a forward rotate and release the S/W the MOTOR is stop for 0.6 second and turns a reverse rotate for 0.5 second. MOTOR OPERATION A FORWARD A REVERSE STATE STOP...
  • Page 31 7-3. RESISTANCE SPECIFICATION OF SENSOR TEMPERATURE SENSOR RESISTANCE OF FREEZER RESISTANCE OF REFRIGERATOR SENSOR (DEFROST) 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 32 7-4. TRUBLE SHOOTING • Replace PCB when no trouble after checking the contents of trouble. CLASSIFICATION STATE OF TROUBLE POINT BE CHECKED CHECKING METHOD CONTENT REMEDY POWER SOURCE 1. All the DISPLAY 1. FREEZER/ FREEZER/REFRIGERATOR POWER SOURCE is poor Certify Fuse. is poor LED OFF REFRIGERATOR...
  • Page 33 CLASSIFICATION STATE OF TROUBLE POINT BE CHECKED CHECKING METHOD CONTENT REMEDY COOLING is poor. REFRIGERATOR 1. FREEZER TEMPERATURE See "FREEZER Certify the attaching state TEMPERATURE is is normal? TEMPERATURE is poor". of DOOR. poor. 2. Cool air of FAN MOTOR is Certify the amount of cool air FAN MOTOR is poor.
  • Page 34 7-5 MAIN PWB ASS'Y AND PARTS LIST 7-5-1 MAIN PWB ASS'Y - 34 -...
  • Page 35 7-5-2 REPLACEMENT PARTS LIST - 35 -...
  • Page 36 7-5-3 PWB ASS'Y, DISPLAY AND PARTS LIST - 36 -...
  • Page 37 7-6 PWB DIAGRAM - 37 -...
  • Page 38 - 38 -...
  • Page 39: Exploded View & Replacement Parts List

    #EV# 8. EXPLODED VIEW & REPLACEMENT PARTS LIST 8-1. The parts of refrigerator and the shape of each part are subject to change in different localities. Capacitors and fuse are optional parts. 501F 281A 103B 410G 301A 401A 281B 411A (501B,C) 501A 103A...
  • Page 40 #EV# 405C 205A 200A 405A 203A 201A 404A 330B 329A 205A 212G 332A 212A 503B 212C 131C 131A 503C 235A 149A 210B 210A 230A 125A 233A 241A 125A 231A 149A 131A 125H 149B 140B 241B 244A 244C 140A 149C 149C 241A 154A 241D...
  • Page 41 #EV# 405C 205A 405A 200A 203A 201A 404A 329A 330B 205A 212G 332A 212B 503B 131C 131C 212A 131A 503C 235A 149A 212D 210B 210A 212C 230A 125A 233A 241A 125A 231A 149A 131A 125H 149B 140B 241B 244C 140A 149C 149C 244D...
  • Page 42 #EV# 405C 200A 405A 205A 203A 201A 404A 329A 330B 205A 212G 332A 503B 131C 131C 109A 1SZZJA 503C 131A 149A 210B 235A 212A 210A 230A 125A 233A 125A 231A 149A 241A 131A 125H 149B 140B 241B 140A 149C 149C 244A 241A 154A...
  • Page 43 #EV# 611M 611A 611P 611N 611Q 611X 611T 611R 611C 611Y 611B 611D 611Z 611E 611H 611S 611K 611W - 43 -...
  • Page 44 P/No. 3828JD8734B OCT., 2004 Printed in Korea...

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Gr-642avpa