LG LSC27950SW Service Manual
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LG LSC27950SW Service Manual

LG LSC27950SW 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.
MODEL : LSC27950SW/ LSC27950SB
LSC27950ST/ LSC27960ST
COLOR : SUPER WHITE
WESTERN BLACK
STAINLESS
http://aic.lgservice.com

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Summary of Contents for LG LSC27950SW

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL BEFORE CHECKING OR OPERATING THE REFRIGERATOR. MODEL : LSC27950SW/ LSC27950SB COLOR : SUPER WHITE LSC27950ST/ LSC27960ST WESTERN BLACK STAINLESS...

  • Page 2: Table Of Contents

    CONTENTS WARNINGS AND PRECAUTIONS FOR SAFETY ........................ 3 SPECIFICATIONS................................... 4 PARTS IDENTIFICATION ................................6 HOW TO INSTALL THE REFRIGERATOR ..........................8 HOW TO ADJUST DOOR HEIGHT............................8 FILTER ....................................9 HOW TO CONTROL THE ICEMAKER WATER SUPPLY....................10 MICOM FUNCTION................................11 EXPLANATION OF 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 1. Ref No. : GR-L277SV(S)VA (LSC27950SW, LSC27950SB, LSC27950ST) 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...
  • Page 5 SPECIFICATIONS 2. Ref No. : GR-L277SSWA (LSC27960ST) 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...

  • Page 6: Parts Identification

    PARTS IDENTIFICATION 1. Ref No. : GR-L277SV(S)VA (LSC27950SW, LSC27950SB, LSC27950ST) PWB Cover Frame Display Water Tubes Dispenser Lamp Ice & Water Dispenser Button Freezer Refrigerator Compartment Compartment Dairy Product Corner Water Filter Lamp Automatic Icemaker Shelf Shelf Lamp Can Server...
  • Page 7 PARTS IDENTIFICATION 2. Ref No. : GR-L277SSWA (LSC27960ST) PWB Cover Frame Display Water Tubes Dispenser Lamp Ice & Water Dispenser Button Freezer Refrigerator Compartment Compartment Dairy Product Corner Water Filter Lamp Automatic Icemaker Shelf Shelf Lamp Can Server Snack Drawer Shelf Door Rack Lamp...

  • Page 8: How To Install The Refrigerator

    HOW TO INSTALL REFRIGERATOR 1. How to Adjust Door Height of Refrigerator I Make the refrigerator level first. (If the refrigerator is not installed on a flat floor, the height of freezer and refrigerator door may not be the same.) 1) If the freezer door is lower than the refrigerator 2) If the freezer door is higher than the refrigerator door:...

  • Page 9: Filter

    NOTE: - To purchase replacement water filter cartridges, visit your local appliance dealer or part distributor. - You can also visit our website : www.lgappliances.com or call 1-877-714-7481. LG MDL PART NO MAKER GR-L277SV(S)VA NOTE: There will be some water (25cc) in the filter LSC27950 SW/SB/ST cartridge.

  • Page 10: How To Control The Icemaker Water Supply

    HOW TO INSTALL REFRIGERATOR 3. How to Control the Amount of Water Supplied to Icemaker. 3-1. Confirm the amount of water supplied to the icemaker. 1) Confirm the amount of water supplied to the icemaker (1) Press the button (Figure 1) to selsct the level of water (Optimum level Large Small.) 2) Icemaker Operation Test (Test mode)

  • Page 11: Micom Function

    MICOM FUNCTION 1. Monitor Panel 1-1. GR-L277SV(S)VA (LSC27950SW, LSC27950SB, LSC27950ST) Ice Plus Freezer Door Alarm Button/ Selection Button Dispenser Lock Button Dispenser Dispenser Light On/Off Button/ Selection Button Filter Status Display RESET Button Temperature Adjust Button Temperature Adjust Button For Freezer Compartment For Refrigerator Compartment 1-2.
  • Page 12 MICOM FUNCTION 1-3. Display Second Function Demo Mode Buzzer Mute Mode Change Display Degree from Display Power Fahrenheit to Centigrade Mode Saving Mode 1. Door Alarm Buzzer Mute Mode Press ALARM/LOCK to turn the buzzer on or off. 2. Display Power saving Mode It places display in standby mode until door is opened.
  • Page 13 MICOM FUNCTION 2. Description of Function 2-1-1. Function of Temperature Selection Division Power Initially On 1st Press 2st Press 3th Press 4th Press Temperature COLD COLDER COLDEST COOL COOLER Control Freezer Control -2 °F -5 °F -8 °F 7 °F 1 °F Refrigeration 37 °F...
  • Page 14 MICOM FUNCTION 2-1-3. Lock function (dispenser and display button lock) 1. In power application of refrigerator, the LOCK text is turned off at the right side of lock graphic of display with the lock replease status. 2. If desiring to lock the dislay the dispenser and control panel, push on the LOCK button more than 3 seconds. LOCK is turned on at the right side of lock graphic of display with lock status.
  • Page 15 • ICE PLUS freezer or JET freezer function automatically turns off after a set time. • Jet Freezing : Not applicable to all models. LED (GR-L277SV(S)VA) (LSC27950SW, LSC27950SB, LSC27950ST) LCD (GR-L277SSWA) (LSC27960ST) 2-4. Dispenser Light • The dispenser light function is repeated following below whenever pressing LIGHT/FILTER button.
  • Page 16 MICOM FUNCTION 2-5. ICE PLUS freezing 1. ICE PLUS freezing is a function to increase the cooling speed of the freezer compartment by running both the compressor and the fan simultaneously. 2. ICE PLUS is cancelled and the refrigerator returns to its default setting in the event of a power interruption. 3.
  • Page 17 MICOM FUNCTION 2-7. OptiFresh Function 1. The OptiFresh bin is positioned at the bottom of the refrigerator compartment and has a separate temperature control to allow perfect storage of fruits and vegetables. 2. OptiFresh comprises of OptiFresh sensor at the rear of OptiFresh and a damper between OptiFresh and Freezer compartment and a temperature adjusting display at the top of it.
  • Page 18 MICOM FUNCTION 2-8. Control of variable type freezing fan 1. To increase cooling speed and response to load, the MICOM will vary the speed of the freezer fan between low and high. 2. The MICOM runs the fan at high speed only at power-up and for ICE PLUS or JET FREEZING cycles, and runs at low speed for all other settings.
  • Page 19 MICOM FUNCTION 2-12. Ringing of manual operation, manual frost defrost buzzer 1. The buzzer sounds briefly when the test button on the main PCB is pressed. 2. If you select manual operation, the buzzer sounds three times for second each, then it sounds three times for second each every thirty seconds until the door is closed.
  • Page 20 MICOM FUNCTION 2-15. Sequential operation of components Component products such as compressor, frost removal heater, freezing room fan, cooling fan, and step motor damper are sequentially operated as follows for preventing noise and part damage occurred due to simultaneous operation of many parts in applying initial power and completing test.
  • Page 21 3. If a failure code is released, the MICOM resets and normal operation continues. 4. The failure code is displayed on the FRZ TEMP display. All display graphics that are not part of the failure code are turned off (1) GR-L277SV(S)VA (LSC27950SW, LSC27950SB, LSC27950ST) - 21 -...
  • Page 22 MICOM FUNCTION (2) GR-L277SSWA (LSC27960ST) - 22 -...
  • Page 23 MICOM FUNCTION Note1) Freezer room notch temperature display and refrigerator room notch temperature display (failure code indication part) are normally indicated in abnormal ambient sensor, and “Er” indicated on the ambient temperature dispaly (except for the ambient temperature display, other display parts are indicated normally) Note 2) R2-sensor, water-tank sensor and opti-fresh sensor is not indicated on the failure indicating part but indIicated in checking all displaly parts (when pressing for more than the button of freezing temperature and quick rfeezing button for more than 1 second).
  • Page 24 MICOM FUNCTION 2-17. Test Function 1. The test function assists in diagnosing the PWB and determining the exact mode of failure. 2. The test button is on the main PCB. When test mode is engaged, it will complete its test cycle and default to normal operation within 2 hours.
  • Page 25 MICOM FUNCTION 2-18. Dispenser Function 1. The dispenser allows serving ice and water without opening the door. 2. Pressing the dispenser switch dispenses crushed or cubed ice or water. If ice is selected, the switch operates the door solenoid also. The door will close 5 seconds after the ice is dispensed. 3.

  • Page 26: Explanation Of Micom Circuit

    Voltage of every part is as follows: Part Voltage 120 Vac 160 Vdc 14 Vdc 12 Vdc 15.5 Vdc 5 Vdc (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) - 26 -...
  • Page 27 MICOM (IC1). The oscillator (OSC1) must always be replaced with an exact replacement part. If this specification is changed, the change will affect the time calculations of the MICOM and it might not work at all. (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) - 27 -...
  • Page 28 A LOW signal applied to the reset terminal for 10 ms causes the MICOM to reset itself. During normal operation, the voltage at the reset terminal is 5 Vdc. If the reset fails, the MICOM will not operate. (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) - 28 -...
  • Page 29 ✽ In the TEST mode, the fan will stop if any door is opened. It will resume operation when the door is closed. Defrost AC Converting Refrigerator Dispenser Type of Load Compressor Heater Relay LAMP Heater Measuring part (IC6) IC6-16 IC6-13 IC6-12 IC6-15 IC6-14 Within 1 V Status 12 V (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) - 29 -...
  • Page 30 EXPLANATION FOR MICOM CIRCUIT 1-5. Dispenser operation circuit (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) 1) Check load driving status WATER VALVE PILOT GEARED SOLENOID SOLENOID Type of Load MOTOR CUBE DISPENSER VALVE WATER Measuring part IC7-15 IC7-14 IC7-13 IC7-12...
  • Page 31 EXPLANATION FOR MICOM CIRCUIT 1-6. Door opening sensing circuit (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) Measuring part IC1 (MICOM) No. (44, 45) / (45, 46) / (47, 48) Pin Door of Freezer and Refrigerator Closing 5 V ( A - B , C - D . Switch at both ends are at Off status) Opening 0 V ( A - B , C - D .
  • Page 32 EXPLANATION FOR MICOM CIRCUIT 1-7. Temperature sensing circuit (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) The circuits involving the freezer and refrigerator sensors control 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 33 EXPLANATION FOR MICOM CIRCUIT 1-8. Switch entry circuit The following circuits are sensing signal form the damper motor reed switch for testing and diagnosing the refrigerator. (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) - 33 -...
  • Page 34 EXPLANATION FOR MICOM CIRCUIT 1-9. Option designation circuit (model separation function) (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) The circuits shown above vary according to which features are included on your particular model. Separation Connection Status Application Standard Connection OptiFresh exist OptiFresh don’t exist...
  • Page 35 EXPLANATION FOR MICOM CIRCUIT 1-10. Stepping motor operation circuit (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) - 35 -...
  • Page 36 EXPLANATION FOR MICOM CIRCUIT 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 37 3. This circuit stops the fan motor by cutting off power to the fan when it senses a lock-up condition. a , d part b part e part Motor OFF 2V or less 2V or less Motor ON 2 ~ 3V 12 ~ 14V 8 ~ 16V (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) - 37 -...
  • Page 38 EXPLANATION FOR MICOM CIRCUIT 1-12. Temperature compensation and temperature compensation circuit 1. Temperature compensation in freezer and refrigerator (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) Temperature compensation at refrigerator Temperature compensation at freezer Freezer Refrigerator Resistance value Temperature Resistance value...
  • Page 39 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 40 EXPLANATION FOR MICOM CIRCUIT 2. Compensation circuit for temperature at freezer (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) 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]...
  • Page 41 MICOM of main PCB and LCD (LED) dedicated MICOM for LCD (LED) control of display PCB. Main PCB L/Wire FD/H(4-wires) Display PCB DC 12V Main MICOM LCD(LED) dedicated MICOM Transmission (error status) Reception (notch status) (1) GR-L277SV(S)VA (LSC27950SW, LSC27950SB, LSC27950ST) - 41 -...
  • Page 42 EXPLANATION FOR MICOM CIRCUIT (2) GR-L277SSWA (LSC27960ST) - 42 -...
  • Page 43 EXPLANATION FOR MICOM CIRCUIT 2) Sensor resistance characteristics table Refrigerator sensor 1&2 Measuring Temperature (°C) Freezing Sensor Defrost sensor, Ambient sensor -20 °C 22.3 kΩ 77 kΩ -15 °C 16.9 kΩ 60 kΩ -15 °C 13.0 kΩ 47.3 kΩ -5 °C 10.1 kΩ...
  • Page 44 EXPLANATION FOR MICOM CIRCUIT 1-14. OptiFresh stepping MOTOR/Display (1) GR-L277SV(S)VA (LSC27950SW, LSC27950SB, LSC27950ST) 1-15. Jet freezing (1) GR-L277SSWA (LSC27960ST) - 44 -...

  • Page 45: Pwb Parts Diagram And List

    EXPLANATION FOR MICOM CIRCUIT 2. PWB parts diagram and list 2-1. PWB Assembly, main part diagram (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) - 45 -...
  • Page 46 EXPLANATION FOR MICOM CIRCUIT 2-2. Parts list (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) - 46 -...
  • Page 47 EXPLANATION FOR MICOM CIRCUIT - 47 -...
  • Page 48 EXPLANATION FOR MICOM CIRCUIT 2-3. DISPLAY ASSEMBLY part diagram (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) - 48 -...
  • Page 49 EXPLANATION FOR MICOM CIRCUIT 2-4. DISPLAY circuit diagram (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) - 49 -...

  • Page 50: Pwb Circuit Diagram

    EXPLANATION FOR MICOM CIRCUIT 3. PWB Circuit Diagram may vary by model. (1) GR-L277SV(S)VA, SSWA (LSC27950SW, LSC27950SB, LSC27950ST, LSC27960ST) - 50 -...
  • Page 51 EXPLANATION FOR MICOM CIRCUIT - 51 -...

  • Page 52: Icemaker And Dispenser Working Principles And Repair

    ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 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 icemaking operation. Harvest •...

  • Page 53: Function Of Icemaker

    ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 2. ICEMAKER 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. 3.
  • Page 54 ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 2-5. Function TEST 1. This is a forced operation for TEST, Service, cleaning, etc. It is operated by pressing and holding the Fill Key for 3 seconds. 2. The test works only in the Icemaking 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 55: Circuit

    CIRCUIT (1) GR-L277SV(S)VA (LSC27950SW, LSC27950SB, LSC27950ST) - 55 -...
  • Page 56 CIRCUIT (2) GR-L277SSWA (LSC27960ST) - 56 -...

  • Page 57: 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 plug and adapter (faulty plug). The distance between pins.
  • Page 58 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 59 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 3. Poor Cooling 1) Refrigerant Partly leaked. Weld joint leak. Parts leak. 2) Poor defrosting capacity. I Check visually. Drain path (pipe) clogged. Inject adiabatics into drain Inject through the hose.
  • Page 60 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 3. Poor Cooling Residual Weak heat from heater. Sheath Heater - rated. frost. Too short defrosting time. Defrost Sensor. - Faulty characteristics. Seat-D (missing, location. thickness). Structural fault. Gasket gap. Air inflow through the fan motor.
  • Page 61 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 3. Poor Cooling 4) No cooling air circulation. Faulty fan motor. Fan is Fan shroud contact. - Clearance. constrained. Damping evaporator contact. Accumulated residual frost. Small cooling air Insufficient Fan overload. - Fan misuse. Bad low termperature RPM characteristics.
  • Page 62 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 4. Warm 1) Clogged cooling path. refrigerator Adiabatics liquid leak ?. compartment Foreign materials. –– Adiabatics dump liquid temperature. 2) Food storage. Store hot food. Store too much at once. Door open.
  • Page 63 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 64 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 7. Sounds 1) Compressor compartment operating sounds. Transformer sound. Bad connection. –– Correct screw connection. Drip tray vibration sound. Bad assembly. Distortion. Foreign materials inside. Back cover machine sound. Bad connection. Partly damaged.
  • Page 65 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 66 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. Fastener worn or damaged. Weak gasket Gasket sealing surface defective. adhesion. Fixed tape.

  • Page 67: Faults

    TROUBLE DIAGNOSIS - 67 -...
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  • Page 84: 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.
  • Page 85 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 86 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 87 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 88 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 89 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 test for gas leakage at the brazed parts.
  • Page 90 TROUBLE DIAGNOSIS 3-6. Brazing Reference Drawings HOT LINE PIPE ASSEMBLY (Freezer) Copper Brazing Copper Brazing TUBE DRIER ASSEMBLY Copper Silver Brazing Brazing JOINT PIPE ASSEMBLY SUCTION PIPE ASSEMBLY Copper Brazing JOINT PIPE WIRE CONDENSER ASSEMBLY ASSEMBLY Copper Brazing Silver Brazing Copper Brazing Coppper Brazing - 90 -...

  • Page 91: 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 92 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 93 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 94 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 95 TROUBLE DIAGNOSIS 4-5. 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 96: How To Disassemble And Assemble

    HOW TO DISASSEMBLE AND ASSEMBLE 1. DOOR (3) Disconnect upper hinge from the hinge supporter 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 97: Handle

    HOW TO DISASSEMBLE AND ASSEMBLE 2. HANDLE 3. FAN SHROUD GRILLE 1) Remove the caps and remove the two screws holding 1) Aluminum short handle Model the upper fan grille. (1) Grasp the handle by both hands and hold it upward. 2) Remove the upper fan grille by pressing in the hooks with a screwdriver blade.

  • Page 98: Water Valve Disassembly Method

    HOW TO DISASSEMBLE AND ASSEMBLE 4. WATER VALVE DISASSEMBLY 4). Separate the Mechanical Cover and Valve Screw. METHOD Mechanical Cover 1) Turn off the power of the refrigerator (pull out the plug). Open the FREEZER and REFRIGERATOR Door and disassemble the Lower Cover. 5) Separate the housing and pull out the valve.

  • Page 99: Dispenser

    HOW TO DISASSEMBLE AND ASSEMBLE 6. 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 100 HOW TO DISASSEMBLE AND ASSEMBLE 7) Dispenser Related Parts FRAME ASSEMBLY, DISPLAY COVER, DISPENSER DECO, FRAME DISPLAY PWB(PCB) ASSEMBLY, DISPLAY FUNNEL ASSEMBLY MICRO SWITCH FRAME, FUNNEL 10 LEVER(SWITCH) 11 FUNNEL 12 BUTTON LEVER 13 HOLLDER BUTTON 14 SOLENOID ASSEMBLY 15 SPRING 16 LEVER HOLDER 17 CAP ASSEMBLY, DUCT 18 CAP, DUCT...

  • Page 101: Exploded View

    #EV# EXPLODED VIEW FREEZER DOOR PART: GR-L277SV(S)VA (LSC27950SW, LSC27950SB, LSC27950ST) : Optional part 611B 200A 611A 202A 610A 600A 614A 210B 205A 210B 210C 201A 203A - 101 -...
  • Page 102 #EV# EXPLODED VIEW REFRIGERATOR DOOR PART: GR-L277SV(S)VA (LSC27950SW, LSC27950SB, LSC27950ST) : Optional part 241A 241C 230A 241B 232A 239A 240A 147A 243A 240A 205A 243A 240A 240C 233A 231A - 103 -...
  • Page 103 #EV# EXPLODED VIEW REFRIGERATOR COMPARTMENT: GR-L277SV(S)VA (LSC27950SW, LSC27950SB, LSC27950ST) : Optional part 270A 270C 402A 271B 271A 137A 136D 403A 136B 135A 136C 152A 329A 128C 400A 302B 401A 128C 128D 130A 128E 128D 128F 120D 120D 621A 120B 623B...
  • Page 104 #EV# EXPLODED VIEW REFRIGERATOR COMPARTMENT: GR-L277SV(S)VA (LSC27950SW, LSC27950SB, LSC27950ST) : Optional part 140A 270B 270D 402A 271B 271C 171A 141A 624D 140B 624B 624C 171B 624A 152A 116A 115A 170A 152A 142A 142C 142D 151A 401A 177A 142B 150A 177B...
  • Page 105 #EV# EXPLODED VIEW MACHINE COMPARTMENT: GR-L277SV(S)VA (LSC27950SW, LSC27950SB, LSC27950ST) : Optional part 502A 101B 406A 407A 303A 407B 500A 303B 304A 101A 303C 502B 313A 316A 300A 310B 307A 307A 328B 317A 328A 301A 327A 317B 104A 306A 308B 309A...
  • Page 106 #EV# EXPLODED VIEW DISPENSER PART: GR-L277SV(S)VA (LSC27950SW, LSC27950SB, LSC27950ST) : Optional part 278A 278C 402C 278B 276A 275A 405A 276B 501A 280A 279B 278D 280B 280C 281A 279A - 111 -...
  • Page 107 #EV# EXPLODED VIEW ICE & WATER PART : Optional part 625A 616F 616G 627A 404A 619A - 117 -...
  • Page 108 P/No. 3828JD8970B JAN., 2006 Printed in Korea...

This manual is also suitable for:

Lsc 27950sbLsc 27950stLsc 27960st

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