LG GA-B409U*QA Service Manual
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LG GA-B409U*QA Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ
THE "SAFETY PRECAUTIONS" IN THIS MANUAL.
MODEL: GA-B409U*QA/B379U*QA
http://biz.lgservice.com

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Summary of Contents for LG GA-B409U*QA

  • Page 1: Safety Precautions

    REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL. MODEL: GA-B409U*QA/B379U*QA...

  • Page 3: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS .............................. 2 SERVICING PRECAUTIONS ............................3 SPECIFICATIONS ................................4 PARTS IDENTIFICATION ...............................6 REPLACEMENT OF DOOR OPENING TYPE ........................8 DISASSEMBLY ................................9 DOOR..................................9 DOOR SWITCH................................9 FAN AND FAN MOTOR..............................10 DEF' CONTROL ASM ..............................10 LAMP..................................10 ADJUSTMENT.......
  • Page 4 SERVICING PRECAUTIONS Features of refrigerant (R600a) After the refrigerant (R600a) is completely discharged, repair any defective parts and replace the dryer. At any case you must use the LOKRING for • Achromatic and odor less gas. connecting or replacing any part in the cycle (No Fire, No Welding). •...

  • Page 5: Parts Identification

    SPECIFICATIONS 1.Ref. No: GA-B409U*QA ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 595(W)X651(D)X1896(H) Transparent Shelf(3 EA) NET WEIGHT (kg) Vegetable Container(1 EA) REFRIGERATOR COMPARTMENT COOLING SYSTEM Fan Cooling Vegetable Container Cover(1 EA) TEMPERATURE REFRIGERATOR Knob Dial Tray Meat (1 EA)* CONTROL FREEZER...
  • Page 6 PARTS IDENTIFICATION Door Swich Utility Corner (movable) Rotatable Removable Glass Shelf(2 or 3) Door Basket (3 or 5) Lamp Multi-air Flow Duct Egg Tray Tray Meat (Optional) Refrigerator Temperature Control Vegetable Drawer Handle Used to keep fruits and vegetables, etc. fresh and crisp.

  • Page 7: Replacement Of Door Opening Type

    REPLACEMENT OF DOOR OPENING TYPE Precaution Before reversing the door, first of all, you should take out food and accessories like shelves or trays which arenot fixed in the fridge-freezer. Use Torque Wrench or Spanner to fix or remove the bolt. Do not lay the fridge-freezer down.

  • Page 8: Disassembly

    DISASSEMBLY 1. DOOR 2. DOOR SWITCH 1) Using the driver remove two small cap of the front. • Freezer Door 2) Loosen four screws in upper part and disconnect top cover. 1) Loosen 2 screws and pull the Cover Lower. 3) Disconnect Lead Wire from switch.

  • Page 9: Fan And Fan Motor

    4 F AN AND F AN M O T OR 6 D AMPER CONT R OL 1) Rem o v e the C o v er Lam p , R and loosen 2 scr e w . 1) Rem o v e free z er d r a w er s . 2) Pull the Control B o x, R and sepa r ate the lead wire 2) Rem o v e t w o ca p , scr e ws and loosen t w o scr e ws in G r ille F an.

  • Page 10: 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 OVERLOAD PROTECTOR(O.L.P) pressure gas evaporated from Evaporator of the Refrigerator, and condenses this gas to high temperature and high pressure gas, and then plays delivering role to Condenser.

  • Page 11: Olp (Over Load Protector)

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

  • Page 12: Troubleshooting

    TROUBLESHOOTING (Mechanical Part) 1. COMPRESSOR AND ELECTRIC COMPONENTS Power Remove the Relay Assy (Rating V oltage Source. from the Compressor ±10%) and measure the voltage between T erminal C of Compressor and T erminals M or S of Relay Assy No V oltage.

  • Page 13: Ptc And Olp

    2. RELAY ASSY (PTC AND OLP) Normal operation of Check another Observation value is Compressor is 220V/50Hz : 22 Ω ±30% electric Separate the Relay Assy 115V/60Hz : 6.8 Ω ｱ30% impossible or poor. components. from Compressor and 240V/50Hz : 33 Ω ±30% measure the resistance 127, 220V/60Hz : between M and S with a 22Ω±30% Tester or Whistone Bridge. (Figure 21) Replace The resistance value is 0 Relay Assy. or serveral hundreds Ω. The value is ∞ . Separate the Relay Assy Check another from the Compressor and electric components. check the resistance value between two terminals of OLP with a Tester.  Replace Relay Assy. 2  ...

  • Page 14: Another Electric Component

    3. ANOTHER ELECTRIC COMPONENTS 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

    4. SERVICE DIAGNOSIS CHART T   B   C     D Cooling is • Is the power cord unplugged from the outlet? • Plug to the outlet. impossible. • Check if the power switch is set to OFF. • Set the switch to ON. •...

  • Page 16: Refrigerating Cycle

    5. REFRIGERATING CYCLE Troubleshooting Chart TEMPERATURE STATE OF  STATE OF THE CAUSE OF THE REMARKS THE SET EVAPORATOR COMPRESSOR PARTIAL Freezer room and Low flowing sound of Refrigerant A little high more than • A little Refrigerant discharges. LEAKAGE  Refrigerator don't cool is heard and frost forms in inlet ambient temperature. • Normal cooling is possible normally.  only.  when injecting of Refrigerant the regular amount. Freezer room and Flowing sound of Refrigerant is Equal to ambient WHOLE •...
  • Page 17 General Control of Refrigerating Cycle ITEMS  CONTENTS AND SPECIFICATIONS  REMARKS WELDING (1) H 30 • Recommend H34 containing 34% Ag in the Service ROD  Center. • Chemical Ingredients Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20% • Brazing Temperature: 710~840°C (2) Bcup-2 • Chemical Ingredients Cu: About 93% P: 6.8~7.5% The rest: within 0.2% •...
  • Page 18 LOKRING TUBE JOINT LOKRING Figure 23. LOKRING ASSEMBLY JAWS BOLT TOOL Figure 24. LOKRING TOOL -18-...

  • Page 19: Micom Function & Pcb Circuit Explanation

    MICOM FUNCTION & PCB CIRCUIT EXPLA N A TI O N This description is made for GA- B359 , B399 . Please refer to overall PCB circuits for other models. 1 FUNCTION EXPOSITION 1) FUNCTION • The initial Temperature of the Freezer Compartment is -19°C respectively. You can now adjust the temperature of the compartments as you want.
  • Page 20 3) SUPER FREEZING (1) It is the function which increases the cooling speed of freezer by continuously operating compressor and freezer fan. When it’s button is pressed, GRAPHIC is on. (2) Whenever selection switch is pressed, selection/release (GR APHIC on/off) changes in turn. (3) If power is on after power cut, SUPER FREEZING function is canc eled.
  • Page 21 5 ) DEFROSTING (1) If the accumulated time for the operation of the COMPRESSOR is meet with 7 hours, the DEFROSTING HEATER is started. (2) The rst defrosting is performed at 4 hours(compressor ON) later since the power is on. (3) If DEFROST SENSOR is over 7°C during DEFROSTING, end the operation of DEFROSTING with DEFROSTING HEATER paused, And after 7 minutes, the operation for the freezing is started.
  • Page 22 O : OPERATE NORMAL OPERATION IN TROUBLE'S OCCURRING ITEMS DESCRIPTION ERROR CODE LEDs COMP DEFROST HEATER 15 minutes On/ FREEZER FREEZER SENSOR open 15 minutes O or short. SENSOR abnormal DEFROST DEFROST SENSOR open No defrosting or short. SENSOR abnormal DEFROST HEATER, DEFROSTING TEMP.
  • Page 23 2 FUNCTION DESCRIPTION 1) ELECTRIC CIRCUITS 14821 TRANS secondary side is composed of electric power circuits for RELAY driving electricity (12Vdc) and for supplying electricit y to MICOM and IC (5Vdc). The voltage in each part is as follows. PARTS both ends of VA1 both ends of both ends of CE1...
  • Page 24 4) LOAD/BUZZER OPERATION (1) LOAD OPERATION CHECK COMP, KIND OF LOAD FAN MOTOR DEFROSTING HEATER COMP COOLING FAN MEASURING POINT (IC5) No.C No.D No.E below 1V STATE If the DOOR-R is opened during FAN MOTOR is operated, FAN MOTOR is stopped immediately. The A , B of DOOR S/W-R is connected DOOR OPEN DETECTION CIRCUIT as follow.
  • Page 25 5) TEMP SENSOR CIRCUITS 28.2KF 28.2KF 16.2KF 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 ROOM TEMPERATUR E POINT Voltage SENSOR...
  • Page 26 7) TEMPERATURE COMPENSATION FREEZER ROOM RESISTANCE VALUES(R1) TEMPERATURE COMPENSATION REMARKS 180 k Ω C ° 56 k Ω +4.0°C 33 k Ω +3.0°C 18 k Ω +2.0°C 12 k Ω +1.0°C 10 k Ω C ° 8.2 k Ω -1.0°C 5.6 k Ω...
  • Page 27 • TEMPERATURE COMPENSATION OF FREEZER ROOM Revi s ed resi s tance 470 Ω 2k Ω 3.3k Ω 5.6k Ω 8.2k Ω 10k Ω 12k Ω 18k Ω 33k Ω 56k Ω 180k Ω Present resi s tance NO T 470 Ω...
  • Page 28 3. SENSOR RESISTANCE CHARACTERISTICS TABLE MEASURED TEMPERATURE RESISTANCE OF FREEZER SENSOR RESISTANCE OF DEFROST SENSOR, ROOM TEMPERATURE SENSOR Ω 77k Ω C ° Ω 60k Ω C ° Ω 47.3k Ω C ° Ω 38.4k Ω C ° Ω 30k Ω C °...
  • Page 29 2) REPLACEMENT PARTS LIST W O R K D E S C R I PTI ON S P E C ' M A K E R R E M A R K Q T Y Q T Y Q T Y Q T Y Q T Y Q T Y N O .
  • Page 30 3) P C B ASS'Y, DISPLAY AND PARTS LIST 0 1 W O R K D E S C R I P T I O N S P E C M A K E R R E A R K Q t y Q t y Q t y N o .
  • Page 31 5. PCB assembly,MAIN circuit drawing- The PCB assembly,MAIN circuit drawing may change without notice. CON1 XOUT POWER TEST RESET KIA7042 COMP HEATER (AIN5) (AIN4) (AIN3) TO DISP CON2 16.2K (AIN2) 13 2 26.1K (AIN1) 12 2 D-SENSOR P72 17 P72 16 29.2K (AIN0) F-SENSOR...
  • Page 32 6. PCB assembly,display circuit drawing- The PCB assembly,displ ay circuit drawing may change without notice. 100uF LED1 FIG.1 FIG.2 COM1 COM2 COM3 COM4 COM1 COM2 COM3 4 .7K KIA7042AP CE13 RT-SENSOR CON1 R29 2K CC17 P37(BZ) REMARK FIG.1 FIG.2 FIG.2 0.1uF R27 2K CC15 102...
  • Page 33 EXPLODED VIEW & REPLACEMENT P ARTS LI S T Ref. No : GA-B409U*QA/B379U*QA The parts of refrigerator and the shape of each part are subject to change in different localities. 103B 281F 102A 103A 407B 281E 281B 102B 120E 406B...

  • Page 34: Exploded View

    Ref. No : GA-B409U*QA 136E 249A 281H 249B 249A 249C 233A 207A 136E 241A 155A 241A 241A 103E 210A 151B 125A 282E 203A 136A 136B 282D 281D 136C 136D 210A -34-...
  • Page 35 Ref. No : GA-B379U*QA 136E 281H 249B 233A 241A 249A 249C 207A 136E 155A 241A 241A 103E 241C 210A 151B 282E 203A 136A 136B 282D 281D 136C 210A 136D -35-...
  • Page 37 P/NO:3828JS8029F...

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