LG LRSC26960TT Service Manual
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LG LRSC26960TT Service Manual

LG LRSC26960TT Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL
BEFORE CHECKING OR OPERATING THE REFRIGERATOR.
LRSC26960TT

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Summary of Contents for LG LRSC26960TT

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL BEFORE CHECKING OR OPERATING THE REFRIGERATOR. LRSC26960TT...

  • Page 2: Table Of Contents

    CONTENTS WARNINGS AND PRECAUTIONS FOR SAFETY ........................ 3 SPECIFICATIONS................................... 4 PARTS IDENTIFICATION ............................... 5 HOW TO INSTALL THE REFRIGERATOR ..........................6 HOW TO ADJUST DOOR HEIGHT............................6 FILTER ....................................7 HOW TO CONTROL THE ICEMAKER WATER SUPPLY....................8 MICOM FUNCTION ................................10 EXPLANATION FOR MICOM CIRCUIT ..........................

  • Page 3: Warnings And Precautions For Safety

    WARNINGS AND PRECAUTIONS FOR SAFETY 8. Do not fray, damage, run over, kink, bend, pull out, or Please observe the following safety precautions to use the refrigerator safely and correctly and to prevent accident or twist the power cord. injury when servicing. 9.

  • Page 4: Specifications

    SPECIFICATIONS Ref No. : GR-L267ATBT ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS 1771 mm DRIER MOLECULAR SIEVE XH-7 in.) CAPILLARY TUBE ID Ø0.83 NET WEIGHT 149 kg (328.5 lbs.) FIRST DEFROST 4 - 5 Hours COOLING SYSTEM Fan Cooling DEFROST CYCLE 13 - 15 Hours TEMPERATURE CONTROL Micom Control DEFROSTING DEVICE...

  • Page 5: Parts Identification

    PARTS IDENTIFICATION Ref No. : GR-L267ATBT PWB Cover Water Tubes Frame Display Dispenser Lamp Ice & Water Dispenser Button Freezer Refrigerator Water Filter Compartment Compartment Dairy Product Corner Lamp Door Rack Shelf Automatic Can Server Icemaker Grab and Go Lamp Egg Box Shelf Snack Drawer...

  • Page 6: How To Install The Refrigerator

    HOW TO INSTALL REFRIGERATOR 1. How to Align Refrigerator Doors I Level the refrigerator. (If the refrigerator is not installed on a flat floor, the height of freezer and refrigerator doors may not be the same.) 1. If the freezer door is lower than the refrigerator 2.

  • Page 7: Filter

    HOW TO INSTALL REFRIGERATOR 2. Filter 2. Replace with a new cartridge. Replace the filter when the indicator light comes on or the Take the new cartridge out of its packaging and remove performance of the icemker or water dispenser decreases protective cover from the o-rings.

  • Page 8: How To Control The Icemaker Water Supply

    HOW TO INSTALL REFRIGERATOR 3. How to Control the Amount of Water Supplied to the Icemaker. 3-1. Confirm the amount of water supplied to the icemaker. 1. Pull out the ice bin shelf in the upper part of the freezer compartment. Caution : •...
  • Page 9 HOW TO INSTALL REFRIGERATOR NOTE: Water pressure will affect the amount of water w w WARNING which enters the icemakers. To change the size of ice Personal Injury Hazard cubes, toggle through the size options by pressing the Avoid contact with the moving parts of the ejector Water Supply Control switch repeatedly.

  • Page 10: Micom Function

    MICOM FUNCTION 1. Display Panel ICEBEAM FILTER CUBE COOLING MONTH ROOM TEMP WATER 3 SECS CRUSH DISPENSER & KEY EXPRESS/JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER/LIGHT LOCK Express Freezer/Jet Freezer Dispenser and Button function selection button Lock button Dispenser selection Dispenser Lamp On/Off button/ button Filter status display RESET button Temperature adjustment button...
  • Page 11 MICOM FUNCTION 2-1-2. LCD Back Light Control 1. In order to see the LCD display more easily, the backlight is turned on for one minute at the initial application of power, for 20 seconds when buttons are pressed, when a door is opened, and for 20 seconds after it is closed. 2.
  • Page 12 MICOM FUNCTION 2-2. Ice / Water Dispenser ❉ Select water, crushed ice, or ice cubes by cycling through the selections when pressing the DISPENSER button. DISPENSER CUBE ❉ Please press the push button lightly by catching and pushing in cup. WATER •...
  • Page 13 MICOM FUNCTION 2-5. Express freezing 1. EXPRESS FREEZING improves the cooling speed of the freezer by running the compressor and the freezer fan. 2. In the event of power failure, EXPRESS FREEZING is cancelled and the freezer defaults to normal operation. 3.
  • Page 14 MICOM FUNCTION 2-7. OptiChill 2-7-1. Temperature Control in OptiChill 1. The Optichill is positioned at the bottom of the refrigerator compartment. It allows the user to select a more specific temperature based on the foods being stored, such as meat, fish, fruits and vegetables, etc. 2.
  • Page 15 MICOM FUNCTION 2-8. Control of variable type of freezing fan 1. To increase the cooling speed and load response speed, the MICOM switches the freezer compartment fan motor between high and regular speeds. 2. The MICOM runs the freezer fan at high speed only at initial power-up, Express Freezing operation, or in response to a high load.
  • Page 16 MICOM FUNCTION 2-12. Automatic Defrost Signal 1. The beep will sound if you press the test button on the main PCB. 2. The regular cycle sounds three short beeps one second apart. 3. When you select the automatic defrost cycle, the alarm sounds three series of three short beeps one minute apart. 2-13.
  • Page 17 MICOM FUNCTION 2-15. Sequential operation of built-in product Electromechanical parts of the appliance, such as the compressor, defrost heater, freezer fan, cooling fan, and damper motor, are operated sequentially as shown in the chart below to prevent noise and circuit overload from everything starting at once.
  • Page 18 MICOM FUNCTION 2-16. Failure Diagnosis Function 1. The failure diagnosis function makes servicing simpler by FAILURE CODE indicating the area of a failure while the product is in INDICATION PART operation. 2. When the appliance enters the failure mode, pressing buttons ICEBEAM FILTER CUBE...
  • Page 19 MICOM FUNCTION Note1) The freezer and refrigerator temperature displays are also used to display error codes. The exception is that when the ambient temperature sensor fails, it shows Er in the ambient temperature display. All other display elements will function normally. Note2) The R2 sensor, Optichill sensor, and water tank sensor are not indicated in the error codes, but you can see these errors by entering the test mode by pressing and holding the Freezer Temperature and Super Freezer buttons simultaneously.
  • Page 20 MICOM FUNCTION 2-17. Test Function 1. The test function is a self-diagnostic system designed to detect problems early and to make diagnosis and repair easier and quicker. 2. The test button is on the main PCB. Test mode can run for up to 2 hours and will then default to the normal operation mode if not reset manually.

  • Page 21: Explanation For Micom Circuit

    EXPLANATION FOR MICOM CIRCUIT 1. Explanation for PWB circuit 1-1. Power circuit The power circuit consists of a Noise filter (SUB PWB) which plays the role of noise rejection and an SMPS (Switching Mode Power Supply) power. The SMPS consists of the rectifying part (BD1, CE1) converting AC voltage to DC voltage, the switching part (IC2) switching the converted DC voltage, transformer transferring energy of the primary side of the switching terminal to secondary side and a feedback part (IC3, IC4) transferring it to the primary side Linear Compressor driver SMPS consist of two (+,-) output power source.
  • Page 22 EXPLANATION FOR MICOM CIRCUIT 1-2. Oscillation circuit The Oscillation circuit (OSC1 & OSC201) generate basic timed signals for time calculations and synchronization for IC1 & IC201. 1-3. Reset circuit The reset circuits allow the MICOM ICs (IC1 & IC201) to initialize and start operation at initial power-up or following a power failure.
  • Page 23 EXPLANATION FOR MICOM CIRCUIT 1-4. Linear Compressor Driver Circuit It includes the driver MICOM (IC201), OP AMP, and controls the compressor. The linear compressor controls the phase angle of the TRIAC to drive. When the motor drives, it detects double-ended voltage & electric current of the motor in order to determine the phase angle of TRIAC.
  • Page 24 EXPLANATION FOR MICOM CIRCUIT 1-5. Communication circuit between Main MICOM and Drive MICOM This circuit carries ON/OF information between the main MICOM (IC1) and the linear compressor drive MICOM (IC201), based on information from the damper closed, door open/closed, and room temperature sensors, and the compressor protection circuit.
  • Page 25 EXPLANATION FOR MICOM CIRCUIT 1-6. Load/dispenser operation, door opening circuit 1-6-1. LOAD DRIVING CIRCUIT 1. In even if opening the door of cold storage room during operation of fan motor at the freezing room, this circuit does not operate. In addition if closing the door of cold storage room, the fan motor normally operates at the RPM previously operated.
  • Page 26 EXPLANATION FOR MICOM CIRCUIT 2. Dispenser operation circuit 1) Check load driving status GEARED SOLENOID SOLENOID Type of Load WATER VALVE MOTOR CUBE DISPENSER Measuring point IC8-NO.15 IC8-NO.14 IC8-NO.13 IC8-NO.13 Within 1 V Status 12 V 2) Lever Switch sensing circuit Measuring point IC1(Micom) (No.
  • Page 27 EXPLANATION FOR MICOM CIRCUIT 3. Door opening sensing circuit Measuring point IC1 (MICOM) No. 47, 46 Pin Door of Freezer / Refrigerator Closing 5 V ( A - B , C - D . Switch at both ends are at Off status) Opening 5 V ( A - B , C - D .
  • Page 28 EXPLANATION FOR MICOM CIRCUIT 1-7. Temperature sensing circuit The circuits involving the freezer and refrigerator sensors controls the temperature in both the freezer and the refrigerator. The Icemaker sensor detects when ice is made. The defrost sensor determines both the need for defrosting and the efficiency of the defrost operation.
  • Page 29 EXPLANATION FOR MICOM CIRCUIT 1-8. Switch entry circuit The following circuit senses signals from the test switch, damper motor reed switch for testing and diagnosing the refrigerator. 1-9. Option designation circuit (model separation function) The circuits shown above vary according to which features are included on your particular model. u These circuits are preset at the factory and cannot be altered.
  • Page 30 EXPLANATION FOR MICOM CIRCUIT 1-10. Stepping motor operation circuit 4,5,7, 12,13 The motor is driven by magnetism formed in the areas of the coils and the stator. Rotation begins when a HIGH signal is applied to MICOM Pin 33 of IC10 (TA7774F). This causes an output of HIGH and LOW signals on MICOM pins 34 and 35. Explanation) The stepping motor is driven by sending signals of 3.33 mSEC via MICOM pins 33, 34, and 35, as shown in the chart below.
  • Page 31 EXPLANATION FOR MICOM CIRCUIT 1-11. Fan motor driving circuit (freezer, mechanical area) 1. The circuit cuts all power to the fan drive IC, resulting in a standby mode. 2. This circuit changes the speed of the fan motor by varying the DC voltage between 7.5 Vdc and 16 Vdc. 3.
  • Page 32 EXPLANATION FOR MICOM CIRCUIT 1-12. Temperature compensation and temperature compensation circuit 1. Temperature compensation in freezer and refrigerator Temperature compensation at refrigerator Temperature compensation at freezer Freezer Refrigerator Resistance value Temperature Resistance value Temperature Remarks (RCF1) compensation (RCR1) compensation 180 kΩ +5 °C [+9°F] 180 kΩ...
  • Page 33 EXPLANATION FOR MICOM CIRCUIT u Temperature compensation table at the refrigerator is as follows: Modification resistance 470 Ω 2 kΩ 3.3 kΩ 5.6 kΩ 8.2 kΩ 10 kΩ 12 kΩ 18 kΩ 33 kΩ 56 kΩ 180 kΩ Current resistance 0.5 °C 1 °C 1.5 °C...
  • Page 34 EXPLANATION FOR MICOM CIRCUIT 2. Compensation circuit for temperature at freezer Temperature compensation in CUT JCR1 +1 °C [+1.8 °F] +2 °C [+3.6 °F] JCR2 +1 °C [+1.8 °F] JCR3 -1 °C [-1.8 °F] -2 °C [-3.6 °F] JCR4 -1 °C [-1.8 °F] Compensation Compensation Temperature compensation value...
  • Page 35 EXPLANATION FOR MICOM CIRCUIT 1-13. Communication circuit and connection L/Wire between main PCB and display PCB The following communication circuit is used for exchanging information between the main MICOM of the Main PCB and the dedicated MICOM of the LED (LCD) Display PCB. A bi-directional lead wire assembly between the two boards is required for the display to function properly.
  • Page 36 EXPLANATION FOR MICOM CIRCUIT 2) Sensor resistance characteristics table Cold storage sensor 1&2 Measuring Temperature (°C) Freezing Sensor Frost removal sensor, Outside sensor -20 °C [-4°F] 22.3 kΩ 77 kΩ -15 °C [5°F] 16.9 kΩ 60 kΩ -10 °C [14°F] 13.0 kΩ...
  • Page 37 EXPLANATION FOR MICOM CIRCUIT 1-14. OptiChill stepping MOTOR/Display 1-15. Jet freezing - 37 -...

  • Page 38: Pwb Parts Diagram And List

    EXPLANATION FOR MICOM CIRCUIT 2. PWB parts diagram and list 2-1. PWB Assembly, main part diagram - 38 -...
  • Page 39 EXPLANATION FOR MICOM CIRCUIT 2-2. Parts list - 39 -...
  • Page 40 EXPLANATION FOR MICOM CIRCUIT - 40 -...
  • Page 41 EXPLANATION FOR MICOM CIRCUIT 2-3. DISPLAY ASSEMBLY 1. DISPLAY part diagram - 41 -...
  • Page 42 EXPLANATION FOR MICOM CIRCUIT 2. DISPLAY circuit diagram - 42 -...

  • Page 43: Pwb Circuit Diagram

    EXPLANATION FOR MICOM CIRCUIT 3. PWB Circuit Diagram may vary according to model. - 43 -...
  • Page 44 EXPLANATION FOR MICOM CIRCUIT - 44 -...

  • Page 45: Operation Principle And Repair Method Of Icemaker

    OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER 1. Operation Principle 1-1. Operation Principle of Icemaker Power On Start Position • Adjusts EJECTOR to Start Position with power on. Icemaking • Waits until water becomes cold after starting the Mode ice making operation. Dump •...

  • Page 46: Control Method According To Functions

    OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER 2. Control Method according to Functions 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.
  • Page 47 OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER 2-4. Fill / Park Position 1. When Ice-Removing control (Normal Ice-Removing control, Ice-Removing control for test) has completed, and the EJECTOR is in place, this control operates the ICE SOLENOID by time check in the compressor enclosure of the refrigerator.

  • Page 48: Defect Diagnosis Function

    OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER 2-5. Function TEST 1. This is a compulsory operation for TEST, SVC, cleaning, etc. It is operated by pressing the water supply control KEY for 3 seconds. 2. It operates in the Icemaking mode, but not in the Ice-Removing mode or water supply process. (If there is an ERROR, it can only be checked in the TEST mode.) 3.

  • Page 49: Circuit

    CIRCUIT - 49 -...

  • Page 50: Linear Compressor

    LINEAR COMPRESSOR 1. Mode The motors used in Linear Compressor have two modes; power and full. Full mode is used in normal operation and Power mode is used under extreme conditions such as initial start up or when items placed in the refrigerator raise the temperature significantly.

  • Page 51: Driving And Operation

    LINEAR COMPRESSOR 2. Start Up and Operation Unlike the off/on operation of a conventional compressor, the start up of a linear compressor requires 1 1/2 to 2 minutes to reach maximum cooling capacity. This reduces noise and vibration. The controlled stroke and speed of a linear compressor also provide a variable cooling capacity.

  • Page 52: Trouble Diagnosis Of Linear Compressor

    LINEAR COMPRESSOR 4. Trouble Diagnosis of Linear Compressor Resistance Value 1Ω ~ 5Ω Multi- tester 1Ω ~ 5Ω Main PWB CON2 CON2 housing Capacitor Linear Compressor Connector Normal under 5Ω Abnormal over 5Ω Standard of Trouble Diagnosis a. When the resistance value measured at CON2 Housing shows infinity Ω or hundreds MΩ, check the linkage of the Compressor Connection Harness-P (Lead Wire) in the machine room .

  • Page 53: Trouble Diagnosis

    TROUBLE DIAGNOSIS 1. TroubleShooting CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK * Measuring instrument: 1) No power at outlet. 1. Faulty start Multi tester 2) No power on cord. I Check the voltage. Bad connection between adapter and outlet. (faulty adapter) The Inner diameter of adapter.
  • Page 54 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK I Heat a clogged evaporator to 2. No cooling. 2) Refrigeration system is clogged. check it. As soon as the Moisture Residual moisture Air Blowing. Not performed. cracking sound starts, the clogged.
  • Page 55 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 3. Refrigeration 1) Refrigerant Partly leaked. Weld joint leak. is weak. Parts leak. 2) Poor defrosting capacity. I Check visually. Drain path (pipe) clogged. Inject adiabatics into drain Inject through the hose.
  • Page 56 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 3. Refrigeration Residual Weak heat from heater. Sheath Heater - rated. is weak. frost. Heater plate No contact to drain. Loosened stopper cord. Heater cord-L Not touching the evaporator pipe. Location of assembly (top and middle).
  • Page 57 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 3. Refrigeration 4) No cooling air circulation. is weak. Faulty fan motor. Fan is Fan shroud contact. - Clearance. constrained. Damping evaporator contact. Accumulated residual frost. Small cooling air Insufficient Fan overload.
  • Page 58 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 4. Warm 1) Colgged cooling path. refrigerator Adiabatics liquid leak. compartment Foreign materials. –– Adiabatics dump liquid. temperature. 2) Food storate. Store hot food. Store too much at once. Door open. Packages block air flow.
  • Page 59 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 6. Condensation 4) Condensation on door. and ice Condensation on the duct door. - Duct door heater is cut. formation. Condensation on the Recess Heater is cut. dispense recess. Duct door is open. / Foreign material clogging. Condensation on the Not fully filled.
  • Page 60 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 7. Sounds 1) Compressor compartment operating sounds. Transformer sound. Its own fault. –– Core gap. Bad connection. –– Correct screw connection. Drip tray vibration sound. Bad assembly. Distortion. Foreign materials inside. Back cover machine sound.
  • Page 61 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 8. Faulty lamp 1) Lamp problem. Filament blows out. (freezer and Glass is broken. refrigerator 2) Bad lamp assembly. Not inserted. compartment). Loosened by vibration. 3) Bad lamp socket. Disconnection. Bad soldering.
  • Page 62 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 10. Structure, 1) Door foam. appearance, Sag. Hinge loose Bolt is loosened during and others. transportation. Not tightly fastened. Screw worn out . Weak gasket Adhesion surface. adhesion. Fixed tape. Not well fixed.

  • Page 63: Faults

    2. Faults 2-1. Power Problems Causes Checks Measures Remarks No power on - Power cord cut. - Check the voltage with tester. -Replace the components. outlet. - Faulty connector insertion. - Check visually. -Reconnect the connecting parts. - Faulty connection between plug - Check visually.
  • Page 64 2-3. Temperature Problems Causes Checks Measures Remarks High Poor cool air circulation due to faulty - Lock –– Check resistance with a - Replace fan motor. temperature fan motor. tester. in the freezer 0Ω: short. ∞Ω: cut. compartment. - Reconnect and reinsert. - Rotate rotor manually and check rotation.
  • Page 65 2-4. Cooling Problems Causes Checks Measures Remarks High Refrigerant leak. Check sequence Weld the leaking part, recharge the Drier must be replaced. temperature 1. Check the welded parts of the refrigerant. in the freezer drier inlet and outlet and drier compartment.
  • Page 66 Problems Causes Checks Measures Remarks High Cycle pipe is clogged. Check sequence. - Heat up compressor discharging Direr must be replaced. temperature in 1. Check temperature of condenser weld joints with torch, disconnect the freezer manually. the pipes, and check the clogging. compartment.
  • Page 67 2-5. Defrosting failure Problems Causes Checks Measures Remarks No defrosting. Heater does not generate heat as 1. Check the resistance of heater. Heating wire is short and wire is cut. Seal the lead wire with 0Ω: Short. ∞Ω: Cut. the heating wire is cut or the circuit •...
  • Page 68 Problems Causes Checks Measures Remarks No defrosting Melting fuse blows. - Check melting fuse with tester. - Faulty parts: parts replacement. 1) Lead wire is cut. If 0Ω: OK. - Check wire color when measuring If ∞Ω: wire is cut. 2) Bad soldering.
  • Page 69 2-6. Icing Problems Causes Checks Measures Remarks Icing in the 1) Bad circulation of cool air. - Check the food is stored properly - Be acquainted with how to use. - Check the defrost refrigerator - Clogged intake port in the (check discharge and intake port - Sealing on connecting parts.
  • Page 70 Problems Causes Checks Measures Remarks Ice in the freezer 1) Bad cooling air circulation. - Check food storage conditions - Be acquainted with how to use. - Check the parts related compartment. - Intake port is clogged in the freezer visually.
  • Page 71 2-7. Sound Problems Causes Checks Measures Remarks Hiss sound 1. Loud sound of compressor 1.1 Check the level of the 1) Maintain horizontal level. operation. refrigerator. 2) Replace bushing and seat if they 1.2 Check the bushing seat are sagged and aged. conditions (sagging and aging).
  • Page 72 Problems Causes Checks Measures Remarks Vibration sound. 1. Vibration of shelves and foods in 1-1. Remove and replace the 1) Reassemble the vibrating parts Clack. the refrigerator. shelves in the refrigerator and insert foam or cushion where 2. Pipes interference and capillary 1-2.
  • Page 73 Problems Causes Checks Measures Remarks Sound Popping It happens when refrigerant expands - Check the sound of refrigerant at the - Check the restrainer attached on the (almost the same at the end of capillary tube. initial installation. evaporator and capillary tube weld as animals crying - Check the sound when the refrigerator joints and attach another restrainer.
  • Page 74 2-8. Odor Problems Causes Checks Measures Remarks Food Odor. Food (garlic, kimchi, etc.) - Check the food is not wrapped. - Dry the deodorizer in a sunny place - Check the shelves or inner with adequate ventilation. wall are stained with food juice. - Store the food in the closed - Be sure food is securely covered container instead of vinyl wraps.
  • Page 75 2-9. Micom Problems Symptom Causes Checks Measures Remarks Bad PCB All display Bad connection Bad connector Visual check on connector Reconnect electric power. LCD are off. between Main PCB connection from main connection. connector. and display circuit. PCB to display PCB. Defective PCB PCB transformer Check resistance of PCB...
  • Page 76 Problems Symptom Causes Checks Measures Remarks Bad cooling. Freezer Compressor does Compressor Lead Wire Check compressor Lead Wire Reconnect Lead temperature is not start. is cut. with a tester. Wire. high. Defective compressor Measure voltage at PCB CON2 Replace relay RY1 Refer to load driving relay.
  • Page 77 Problems Symptom Causes Checks Measures Remarks Bad cooling Wrong Defective Step Motor Check Step Motor Check if Step Motor damper Reconnect lead Refrigerator Damper. damper motor and motor and reed switch lead wire. temperature. reed switch and lead wire are cut with a tester. wire are cut.
  • Page 78 Problems Symptom Causes Checks Measures Remarks Bad defrost. Defrost is not Defrost lead wire is cut. Check if defrost lead wire is cut with a Reconnect Lead working. tester. Wire. Defective defrost driving relay. Check the voltage of CON2 (1 and 7) Replace relay (RY 7 Refer to load with a tester after pressing main and RY 3) or PCB.
  • Page 79 Problems Symptom Causes Checks Measures Remarks Defective Buzzer does Trouble mode indication. Check trouble diagnosis function. Repair troubles Refer to mode display button. not sound indication in and buttons function do not operate. explanations. Door Buzzer Buzzer Defective connecting lead wire from Check lead wire associated with door Repair lead wire.

  • Page 80: Cooling Cycle Heavy Repair

    TROUBLE DIAGNOSIS 3. Cooling Cycle Heavy Repair 3-1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant Items Unit Standards Purposes Remarks Pipe and piping Min. Pipe:within 1 hour. To protect The opening time should be reduced to a system opening time. Comp:within Moisture half of the standards during rain and...
  • Page 81 TROUBLE DIAGNOSIS 3-2. Summary Of Heavy Repair Process Contents Tools Trouble diagnosis Remove refrigerant - Cut charging pipe ends and discharge refrigerant from Filter, side cutters Residuals drier and compressor. - Use R134a oil and refrigerant for compressor and drier Pipe Cutter, Gas welder, N - Confirm N sealing and packing conditions before use.
  • Page 82 TROUBLE DIAGNOSIS 3-3. Precautions During Heavy Repair Items Precautions 1. Use of tools. 1) Use special parts and tools for R134a. 2. Recovery of refrigerant. 1) Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator off. 2) Install a piercing type valve on the high pressure line (drier side).
  • Page 83 TROUBLE DIAGNOSIS 3-4. Practical Work For Heavy Repair Items Precautions Evaporator 1. Removal of residual Low pressure side refrigerant. KEY POINT Hot Line Compressor Observe the sequence for removal of refrigerant. Drier Suction (If not, compressor oil may leak.) High pressure side Release Condenser Refrigent...
  • Page 84 TROUBLE DIAGNOSIS Items Precautions Evaporator 4. Vacuum degassing. Suction pipe Hot Line Compressor Drier Condenser pressure High Blue pressure Yellow KEY POINT - If power is applied Vaccum Pump during vacuum degassing, vacuum degassing shall be more effective. Pipe Connection - Run the compressor Connect the red hose to the high pressure side and the blue hose to the while charging the...
  • Page 85 TROUBLE DIAGNOSIS Items Precautions Evaporator Hot Line Compressor Drier Condenser Charging Canister 4) Refrigerant Charging Charge refrigerant while operating a compressor as shown above. 5) Pinch the charging pipe with a pinch-off plier after completion of charging. 6) Braze the end of a pinched charging pipe with copper brazer and take a gas leakage test on the welded parts.
  • Page 86 TROUBLE DIAGNOSIS 3-6. Brazing Reference Drawings PIPE ASSEMBLY, HOT LINE (Freezer) Copper Braze Copper Braze CAPI - TUBE DRIER ASSEMBLY Copper Silver Braze Braze PIPE ASSEMBLY, JOINT PIPE ASSEMBLY, SUCTION Copper Braze PIPE ASSEMBLY, CONDENSER ASSEMBLY, WIRE JOINT Copper Braze Silver Braze Copper Braze Coppper Braze...

  • Page 87: How To Deal With Claims

    TROUBLE DIAGNOSIS 4. HOW TO DEAL WITH CLAIMS 4-1. Sound Problems Checks and Measures I Explain general principles of sounds. Hiss sounds • All refrigerators make noises when they run. The compressor and fan produce sounds. There is a fan in the freezer compartment which blows cool air to freezer and refrigerator compartments.
  • Page 88 TROUBLE DIAGNOSIS Problems Checks and Measures I Explain the flow of refrigerant. Sounds of water flowing • When the refrigerator stops, the water flowing sound happens. This sound happens when the liquid or vapor refrigerant flows from the evaporator to compressor. I Explain the characteristics of moving parts.
  • Page 89 TROUBLE DIAGNOSIS 4-2. Measures for Symptoms on Temperature Problems Checks and Measures I Check temperature set in the temperature control knob. Refrigeration is weak. • Refrigerator is generally delivered with the button set at normal use (MID). But customer can adjust the temperature set depending on their habit and taste. If you feel the refrigeration is weak, then set the temperature control button at strong position.
  • Page 90 TROUBLE DIAGNOSIS 4-3. Odor and Frost Problems Checks and Measures I Explain the basic principles of food odor. Odor in the refrigerator compartment. • Each food has its own particular odor. Therefore it is impossible to prevent or avoid food odor completely when food is stored in the completely sealed refrigerator compartment.
  • Page 91 TROUBLE DIAGNOSIS 4-4. Others Problems Checks and Measures I Explain the principles of radiator. The refrigerator case is hot. • The radiator pipes are installed in the refrigerator case and partition plate between the refrigerator and the freezer compartment in order to prevent condensation formation.

  • Page 92: How To Disassemble And Assemble

    HOW TO DISASSEMBLE AND ASSEMBLE 1. DOOR (3) Disconnect upper hinge a from the hinge supporter b by grasping the front part of upper hinge and lifting up (Hinge Assembly, U) in arrow direction A and pull 1) Remove lower cover and then disconnect water forward in arrow B direction.

  • Page 93: Handle

    HOW TO DISASSEMBLE AND ASSEMBLE 2. HANDLE 2. Plastic handle Model 1) Use a small screwdriver blade in the groove at the side of 1. Aluminum Handle Model the Deco Handle to push it down slightly and separate the 1) Use a small screwdriver blade in the groove at the side cover.

  • Page 94: Fan Shroud Grille

    3. Fan Shroud Grille 4. ICEMAKER ASSEMBLY 1) Loosen two screws after disconnecting a cap screw of a 1. Dispenser Model grille fan (U) with a screwdriver blade. 1) How to disassemble: 2) Disassembly of a grille fan (U) : Pull forward after opening hook at ➝...

  • Page 95: Dispenser

    HOW TO DISASSEMBLE AND ASSEMBLE 5. DISPENSER 4) Loosen four screws with a phillips screwdriver and pull the funnel Assembly to disconnect. 1) Disconnect funnel and button assembly by pulling down and forward. Funnel Assembly Funnel Assembly Button 5) The Duct Cap Assembly can be disconnected if the hold lever connecting screw is loosened with a phillips driver.
  • Page 96 HOW TO DISASSEMBLE AND ASSEMBLE 7) Dispenser Related Parts 277A FRAME ASSEMBLY, DISPLAY DISPENSER COVER PWB(PCB) ASSEMBLY, DISPLAY FUNNEL ASSEMBLY MICRO SWITCH FUNNEL FRAME 10 LEVER(SWITCH) 11 FUNNEL 12 FUNNEL GUIDE 13 ROCKER SWITCH 14 SOLENOID ASSEMBLY 15 SPRING 16 LEVER HOLDER 17 DUCT CAP 19 DISPENSER LEVER 20 BUSHNIG CAP...

  • Page 97: Exploded View

    EXPLODED VIEW FREEZER DOOR PART : Optional part 200A 202A 205A 205E 210A 205C 205B 210B 205D 210B 205F 210C 201A 203A - 97 -...
  • Page 98 EXPLODED VIEW REFRIGERATOR DOOR PART : Optional part 241A 241C 230A 241B 232A 147C 147B 239A 242B 147A 205A 205E 242C 242A 205C 242D 242B 242C 242A 242D 243A 205B 240A 205D 205F 240C 233A 231A - 98 -...
  • Page 99 EXPLODED VIEW FREEZER COMPARTMENT : Optional part 270A 270C 402A 271B 271A 137A 136D 403A 136B 135A 136C 128G 152A 329A 128H 128C* 400A 302B 401A 128C 128D* 130A 128E 120B 128D 121A 128F 403C 139B 403D 120C 272A 127B 103A 408A 135B...
  • Page 100 EXPLODED VIEW REFRIGERATOR COMPARTMENT 140A : Optional part 140B 146B* 270B 140C 270D 146A 402A 171A 141A 271B 171B 271C 624D 624B 141B 624C 624A 141C 116A 115A 152A 170A 142A 142D 142C 152A 142B 401A 151A 177A 150A 177B 145A 155A 166A...
  • Page 101 EXPLODED VIEW ICE & WATER PART : Optional part 625A 618A 616E 616F 616D 616G 627A 621C 404A 619A 612A 612C 612B 610A 611A 611C 611B 611D 600A 404B 614A 621B 613A 600B 606A - 101 -...
  • Page 102 EXPLODED VIEW MACHINE COMPARTMENT : Optional part 502A 101B 500B 411A 407B 500A 304A 101A 502B 303C 303D 313A 300A 310B 307A 307A 317A 301A 317B 104A 308B 306A 309A 309C 305A 403B 305B 310A 309B 305C 308C 308A 305C 305B - 102 -...
  • Page 103 EXPLODED VIEW DISPENSER PART : Optional part 278A 277A 278C 402C 278B 276A 275A 278F 405A 275D 275C 276B 275B 280D 401C 280E 501A* 279D 280F 279C 279E 278G 279B 281A 280C 280G 280B 279A - 103 -...

  • Page 104: Replacement Parts List

    P/No. 3828JD8589G MAR., 2004 Printed in Korea...

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