LG LSC26905TT Service Manual
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LG LSC26905TT Service Manual

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See also: Owner's Manual , User Manual
REFRIGERATOR
SERVICE MANUAL
CAUTION
PLEASE READ THE SAFETY PRECAUTIONS OF THIS MANUAL CAREFULLY
BEFORE REPAIRING OR OPERATING THE REFRIGERATOR
MODEL: LSC26905TT
http://biz.lgservice.com
COLOR: STAINLESS
WESTERN BLACK
STAINLESS
TITANIUM
NEO TITANIUM

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Summary of Contents for LG LSC26905TT

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION PLEASE READ THE SAFETY PRECAUTIONS OF THIS MANUAL CAREFULLY BEFORE REPAIRING OR OPERATING THE REFRIGERATOR MODEL: LSC26905TT COLOR: STAINLESS WESTERN BLACK STAINLESS TITANIUM NEO TITANIUM...

  • Page 2: Table Of Contents

    CONTENTS WARNINGS AND PRECAUTIONS FOR SAFETY ........................ 3 SPECIFICATIONS................................... 4 PARTS IDENTIFICATION ............................... 7 HOW TO INSTALL THE REFRIGERATOR .......................... 11 HOW TO ADJUST THE DOOR HEIGHT..........................11 FILTER ....................................12 HOW TO CONTROL THE ICEMAKER WATER SUPPLY....................14 MICOM FUNCTION ................................16 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 3. Ref No. :LSC26905TT (Refer to appendix) ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS 1771 mm DRIER MOLECULAR SIEVE XH-7 in.) CAPILLARY TUBE ID Ø0.83 NET WEIGHT 130 kg (286.6 lbs.) FIRST DEFROST 4 - 5 Hours COOLING SYSTEM Fan Cooling...

  • Page 5: Parts Identification

    PARTS IDENTIFICATION 4. Ref No. : LSC26905TT (Refer to appendix) PWB Cover Display Frame Water Tubes Dispenser Lamp Ice & Water Dispenser Button Freezer Refrigerator Water Filter Compartment Compartment Dairy Product Corner Door Rack Lamp Automatic Shelf Icemaker Door Rack...

  • Page 6: How To Install The Refrigerator

    HOW TO INSTALL THE REFRIGERATOR 1. How to adjust the Refrigerator Door Height 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.

  • Page 7: Filter

    - You can also visit our website : www.lgeus.com or call 1-800 -243-000. FITER ASSEMBLY, WATER LG MDL PART NO MAKER GR-L267BV(T)R NOTE: There will be some water (25cc) in the filter...
  • Page 8 HOW TO INSTALL THE REFRIGERATOR I Install Water Filter (Applicable to some models only) I Before Installing Water Filter Control Box 1. Before installing the filter, take out the top shelf of the refrigerator after tilting it to the direction and lifting it to the direction and move it to the lower part.
  • Page 9 HOW TO INSTALL THE REFRIGERATOR 3. How to Control the Amount of Water Supplied to 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 10 HOW TO INSTALL THE REFRIGERATOR 3-2. Control the amount of water supplied to the icemaker. Caution : • Unplug the power cord from the wall outlet and wait at least three minutes before removing the main PWB cover. 310 Volts are present in the control panel. (+) Driver 1.

  • Page 11: Micom Function

    MICOM FUNCTION 1. Monitor Panel 1-1. GR-L267BV(T)RA, GR-L267BV(T, S)PA (Refer to appendix) EXPRESS FILTER CUBE DIGITAL CONTROL (EXPRESS) FILTER RESET HOLD 3SECS ROOM TEMPERATURE WATER LOCK 3 SECS FRZ TEMP REF TEMP CRUSH (JET) DISPENSER & BUTTON EXPRESS/JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER/LIGHT...
  • Page 12 MICOM FUNCTION 1-4. Display Second Function EXPRESS FILTER DIGITAL CONTROL CUBE (EXPRESS) FILTER RESET HOLD 3SECS ROOM TEMPERATURE WATER LOCK 3 SECS FRZ TEMP REF TEMP CRUSH (JET) DISPENSER & BUTTON EXPRESS/JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER/LIGHT LOCK Buzzer mute Mode Exhibition Mode Display Power...
  • 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 Setting temperature Temperature Medium Medium High High Medium Low Control Freezer Control -2 °F -5 °F -8 °F 7 °F 1 °F Refrigeration...
  • 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 text is turned on at the right side of lock graphic of display with lock status.
  • Page 15 MICOM FUNCTION 2-2. Dispenser use selection LED(GR-L267BNRY) You can select water or ice. DISPENSER ❉ Please select water, cruched ice, and cubed ice by pressing the button DISPENSER CUBE as you desire. ❉ Use your cup to press lightly on the actuator. WATER •...
  • Page 16 MICOM FUNCTION 2-5. Express freezing 1. Express freezing increases the cooling speed in the freezer by running the fan and the compressor simultaneously. 2. Express freezing is released if the power fails and is restored. 3. The temperature setting is not changed when Express Freeze is selected. 4.
  • Page 17 MICOM FUNCTION 2-7. OptiChill Function (GR-L267BV(T,S)PA Model) (Refer to appendix) 1. The OptiChill is positioned at the bottom of fresh food room separately and allow the user to select and adjust a desired temperature according to kinds of food such as meat, fish, vegetables and fruits and so on. The selected temperature to any kinds of food let user to keep their food longer.
  • Page 18 MICOM FUNCTION 2-8. Control of variable type of freezing fan 1. To increase cooling speed and load response speed, MICOM variably controls freezing room fan motor at the high speed of RPM and standard RPM. 2. MICOM only operates in the input of initial power or express freezing operation or load response operation for the high speed of RPM and operates in the standard RPM in other general operation.
  • Page 19 MICOM FUNCTION 2-12. Ringing of compulsory operation, compulsory frost removal buzzer 1. If pressing the test button in the Main PCB, a beep will sound. 2. In selecting compulsory operation, alarm sound is repeated and completed in the cycle of On for 2/10 second and Off for 1 8/10 second three times.
  • Page 20 MICOM FUNCTION 2-15. Sequential operation of built-in product Built-in products such as compressor, frost removal heater, freezing room fan, Cooling fan and step motor damper are operated sequentially as follows to prevent noise and part damage due to simultaneous operation of several parts in applying initial power and completing test.
  • Page 21 MICOM FUNCTION 2-16. Failure Diagnosis Function 1. Failure diagnosis function is to facilitate service when a failure occurs and produces an error code. 2. In occurrence of failure, pressing the function adjustment button does not perform function. 3. If nonconforming matters occurred are released during display of failure code, MICOM returns to the original state (Reset). 4.
  • Page 22 MICOM FUNCTION (2) GR-L267BV(T)RA, GR-L267BV(T,S)PA (Refer to appendix) Failure Code Indication Part EXPRESS FILTER CUBE DIGITAL CONTROL (EXPRESS) FILTER RESET HOLD 3SECS ROOM TEMPERATURE WATER LOCK 3 SECS FRZ TEMP REF TEMP CRUSH (JET) DISPENSER & BUTTON : Proper operation Failure code indication part Product operation status in failure Item...
  • Page 23 MICOM FUNCTION (3) GR-L267BNRY (Refer to appendix) - 28 -...
  • Page 24 MICOM FUNCTION Note1) R2-sensor, OptiChill sensor and water tank sensor, Ice maker-sensor, Ice maker Unit are not indicated on the failure indicating part but indicated in checking Display (When pressing for more than the button of freezing temperature and super freezer button for more than 1 second). R2-sensor (middle room) Normal: LED or LCD graphic on the (C) part turns on or Abnormal Drive Micom...
  • Page 25 MICOM FUNCTION 2-17. Test Function 1. The purpose of test function is to check function of the PWB and product and to search for the failure part at the failure status. 2. Test button is placed on the main PCB of refrigerator (test switch), and the test mode will be finished after maximum 2 hours regardless of test mode and then is reset to the normal status.
  • Page 26 MICOM FUNCTION 2-18. Function of dispenser and water dispenser built-in 1. The dispenser allows ice and water to be served without opening the freezer door. 2. Press the dispenser switch (the rubber button) after selecting crushed ice, cubed ice, or water. The dispenser door will open automatically.

  • Page 27: Explanation For Micom Circuit

    EXPLANATION FOR MICOM CIRCUIT 1. Explanation for PWB circuit 1-1. Power circuit The power circuit includes a Switched Mode Power Supply (SMPS). It consists of a rectifier (BD1 and CE1) converting AC to DC, a switch (IC2) switching the DC voltage, a transformer, and a feedback circuit (IC3 and IC4). Caution : Since high voltage (160 Vdc) is maintained at the power terminal, wait at least 3 minutes after unplugging the appliance to check the voltages to allow the current to dissipate.
  • Page 28 EXPLANATION FOR MICOM CIRCUIT (2) GR-L267BV(T)RA (Refer to appendix) (3) GR-L267BV(T,S)PA (Refer to appendix) - 33 -...
  • Page 29 EXPLANATION FOR MICOM CIRCUIT 1-2. Oscillation circuit The oscillation circuit generates a basic clock signal for synchronization and time calculation related to the transmission of data and calculations made by the MICOM (IC1). The oscillator (OSC1) must always be replaced with an exact rated part, because if this spec is changes, the time calculations of the MICOM will be affected and it might not work at all.
  • Page 30 EXPLANATION FOR MICOM CIRCUIT 1-3. Reset circuit The RESET circuit allows various parts of the MICOM, such as RAM, defrosting, etc., to be restarted from the initial state when power is interrupted or restored. A LOW signal applied to the reset terminal for 10 ms causes the MICOM to reset itself.
  • Page 31 EXPLANATION FOR MICOM CIRCUIT 1-4. Load/dispenser operation, door opening circuit 1. LOAD DRIVING CIRCUIT ✽ The fan operates at the regular speed even if the door of the refrigerator or freezer is opened. When the doors are closed, the fan reverts to its original speed. ✽...
  • Page 32 EXPLANATION FOR MICOM CIRCUIT (2) GR-L267BNRY (Refer to appendix) - 37 -...
  • Page 33 EXPLANATION FOR MICOM CIRCUIT (3) GR-L267BV(T)RA (Refer to appendix) (4) GR-L267BV(T,S)PA (Refer to appendix) Frost Removal AC Converting Refrigerator Dispensor Type of Load Compressor Heater Relay LAMP Heater Measuring part (IC6) IC6-15 IC6-11 IC6-10 IC6-14 IC6-12 Within 1 V Status 12 V - 38 -...
  • Page 34 EXPLANATION FOR MICOM CIRCUIT 2. Dispenser operation circuit (1) GR-L267BV(T)R, BNRY (Refer to appendix) 1) Check load driving status WATER VALVE GEARED SOLENOID SOLENOID Type of Load MOTOR CUBE DISPENSER WATER Measuring part IC6-11 IC6-10 IC7-15 IC7-13 Within 1 V Status 12 V 2) Lever Switch sensing circuit...
  • Page 35 EXPLANATION FOR MICOM CIRCUIT (2) GR-L267BV(T)RA (Refer to appendix) 1) Check load driving status WATER VALVE GEARED SOLENOID SOLENOID Type of Load MOTOR CUBE DISPENSER WATER Measuring part IC6-11 IC6-10 IC7-15 IC7-13 Within 1 V Status 12 V 2) Lever Switch sensing circuit Measuring part IC1(MICOM) (No.
  • Page 36 EXPLANATION FOR MICOM CIRCUIT (3) GR-L267BV(T,S)PA (Refer to appendix) 1) Check load driving status WATER VALVE GEARED SOLENOID SOLENOID Type of Load MOTOR CUBE DISPENSER WATER Measuring part IC7-20 IC7-19 IC7-17 IC7-15 Within 1 V Status 12 V 2) Lever Switch sensing circuit Measuring part IC1(MICOM) (No.
  • Page 37 EXPLANATION FOR MICOM CIRCUIT 3. Door opening sensing circuit (1) GR-L267BV(T)R, BNRY (Refer to appendix) (2) GR-L267BV(T)RA (Refer to appendix) (3) GR-L267BV(T,S)PA (Refer to appendix) Measuring part IC1 (MICOM) No. (44, 45) / (45, 46) / (47, 48) Pin Door of Freezer / Refrigerator Closing 5 V ( A - B , C - D .
  • Page 38 EXPLANATION FOR MICOM CIRCUIT 1-5. Temperature sensing circuit (1) GR-L267BV(T)R, BNRY (Refer to appendix) (2) GR-L267BV(T)RA (Refer to appendix) 10KF CE18 CC32 - 43 -...
  • Page 39 EXPLANATION FOR MICOM CIRCUIT (3) GR-L267BV(T,S)PA (Refer to appendix) 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 40 EXPLANATION FOR MICOM CIRCUIT 1-6. Switch entry circuit The following circuits are sensing signals from the test switch, damper motor reed switch for testing and diagnosing the refrigerator. (1) GR-L267BV(T)R, BNRY (Refer to appendix) (2) GR-L267BV(T)RA (Refer to appendix) (3) GR-L267BV(T,S)PA (Refer to appendix) - 45 -...
  • Page 41 EXPLANATION FOR MICOM CIRCUIT 1-7. Option designation circuit (model separation function) (1) GR-L267BV(T)RA (Refer to appendix) (2) GR-L267BV(T,S)PA (Refer to appendix) The circuits shown above may vary by model. uThese circuits are preset at the factory and cannot be altered. - 46 -...
  • Page 42 EXPLANATION FOR MICOM CIRCUIT 1-8. Stepping motor operation circuit (1) GR-L267BV(T)R, BNRY (Refer to appendix) (2) GR-L267BV(T)RA (Refer to appendix) (3) GR-L267BV(T,S)PA (Refer to appendix) - 47 -...
  • Page 43 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 44 EXPLANATION FOR MICOM CIRCUIT 1-9. 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 45 EXPLANATION FOR MICOM CIRCUIT (2) GR-L267BNRY (Refer to appendix) - 50 -...
  • Page 46 EXPLANATION FOR MICOM CIRCUIT (3) GR-L267BV(T)RA (Refer to appendix) (4) GR-L267BV(T,S)PA (Refer to appendix) - 51 -...
  • Page 47 EXPLANATION FOR MICOM CIRCUIT 1-10. Temperature compensation and temperature compensation circuit 1. Temperature compensation in freezer and refrigerator (1) GR-L267BV(T)R (2) GR-L267BV(T)RA (Refer to appendix) (Refer to appendix) Temperature compensation at refrigerator Temperature compensation at freezer (3) GR-L267BV(T,S)PA (Refer to appendix) Temperature compensation at refrigerator Temperature compensation at freezer Freezer...
  • Page 48 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 49 EXPLANATION FOR MICOM CIRCUIT 2. Compensation circuit for temperature at freezer (1) GR-L267BV(T)RA (2) GR-L267BV(T,S)PA (Refer to appendix) (Refer to appendix) 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...
  • Page 50 EXPLANATION FOR MICOM CIRCUIT 1-11. Communication circuit and connection Lead 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 51 EXPLANATION FOR MICOM CIRCUIT (2) GR-L267BV(T)RA (Refer to appendix) FILTER EXPRESS CUBE DIGITAL CONTROL FILTER RESET HOLD 3SECS ROOM TEMPERATURE WATER LOCK 3 SECS FRZ TEMP REF TEMP CRUSH DISPENSER & BUTTON (3) GR-L267BV(T,S)PA (Refer to appendix) FILTER CUBE DIGITAL CONTROL EXPRESS FILTER RESET ROOM TEMPERATURE...
  • Page 52 EXPLANATION FOR MICOM CIRCUIT 2) Sensor resistance characteristics table Cold storage sensor 1 & 2 Measuring Temperature Measuring Temperature Freezing Sensor (°C) ( °F) Frost removal sensor, Outside sensor -20 °C -4 °F 22.3 kΩ 77 kΩ -15 °C +5 °F 16.9 kΩ...
  • Page 53 EXPLANATION FOR MICOM CIRCUIT 1-12. OptiChill stepping MOTOR/Display (1) GR-L267BV(T,S)PA (Refer to appendix) 1-13. Jet Freezing (1) GR-L267BV(T,S)PA (Refer to appendix) - 58 -...

  • Page 54: Pwb Parts Diagram And List

    EXPLANATION FOR MICOM CIRCUIT 2. PWB parts diagram and list 2-1. PWB Assembly, main part diagram (1) GR-L267BV(T)R (Refer to appendix) - 59 - - 60 -...
  • Page 55 EXPLANATION FOR MICOM CIRCUIT (2) GR-L267BV(T)RA (Refer to appendix) - 61 - - 62 -...
  • Page 56 EXPLANATION FOR MICOM CIRCUIT (3) GR-L267BV(T,S)PA (Refer to appendix) - 63 - - 64 -...
  • Page 57 EXPLANATION FOR MICOM CIRCUIT 2-2. Parts list (1) GR-L267BV(T)R (Refer to appendix) - 65 -...
  • Page 58 EXPLANATION FOR MICOM CIRCUIT - 66 -...
  • Page 59 EXPLANATION FOR MICOM CIRCUIT (2) GR-L267BNRY (Refer to appendix) - 67 -...
  • Page 60 EXPLANATION FOR MICOM CIRCUIT - 68 -...
  • Page 61 EXPLANATION FOR MICOM CIRCUIT (3) GR-L267BV(T)RA (Refer to appendix) - 69 -...
  • Page 62 EXPLANATION FOR MICOM CIRCUIT - 70 -...
  • Page 63 EXPLANATION FOR MICOM CIRCUIT (4) GR-L267BV(T,S)PA (Refer to appendix) - 71 -...
  • Page 64 EXPLANATION FOR MICOM CIRCUIT - 72 -...
  • Page 65 EXPLANATION FOR MICOM CIRCUIT 2-3. DISPLAY ASSEMBLY part diagram (1) GR-L267BV(T)R (Refer to appendix) SW101(QF) SW102(S) SW103(F) SW104(R) SW105(FC) SW106(LOCK) W O R K P/NO DESCRIPTION S P E C MAKER REMARK Q t y 6870JB8189A P W B ( P C B ) CHD-PJT BETTER1 MODULE DISPLAY DAEDUCK FR1(STH)
  • Page 66 EXPLANATION FOR MICOM CIRCUIT (2) GR-L267BNRY (Refer to appendix) - 74 -...
  • Page 67 EXPLANATION FOR MICOM CIRCUIT (3) GR-L267BV(T)RA, GR-L267BV(T,S)PA (Refer to appendix) - 75 -...
  • Page 68 EXPLANATION FOR MICOM CIRCUIT 2-4. DISPLAY circuit diagram (1) GR-L267BV(T)R (Refer to appendix) L101,102 L103,104 L105,106 L107,108 L109,110 L143,144 (Refrigerate low) (Refrigerate low/ (Refrigerate (Refrigerate (Refrigerate (Lock on) medium) medium) medium/ high) high) L111,112 L113,114 L115,116 L117,118 L119,120 L133,134 (Freeze low) (Freeze low/ (Freeze medium) (Freeze medium/...
  • Page 69 EXPLANATION FOR MICOM CIRCUIT (2) GR-L267BNRY (Refer to appendix) (Refrigerate low) (Refrigerate low/ (Refrigerate (Refrigerate (Refrigerate (Lock on) medium) medium) medium/ high) high) (Freeze low) (Freeze low/ (Freeze medium) (Freeze medium/ (Freeze high) (Special on) medium) high) (Cube) (Water) (Crushed) (Filter) (Lamp) - 77 -...
  • Page 70 EXPLANATION FOR MICOM CIRCUIT (3)GR-L267BV(T)RA, GR-L267BV(T,S)PA (Refer to appendix) - 78 -...

  • Page 71: Pwb Circuit Diagram

    EXPLANATION FOR MICOM CIRCUIT 3. PWB Circuit Diagram may vary by to model. (1) GR-L267BV(T)R (Refer to appendix) - 79 -...
  • Page 72 EXPLANATION FOR MICOM CIRCUIT - 80 -...
  • Page 73 EXPLANATION FOR MICOM CIRCUIT (2) GR-L267BNRY (Refer to appendix) - 81 -...
  • Page 74 EXPLANATION FOR MICOM CIRCUIT - 82 -...
  • Page 75 EXPLANATION FOR MICOM CIRCUIT (3) GR-L267BV(T)RA (Refer to appendix) - 83 -...
  • Page 76 EXPLANATION FOR MICOM CIRCUIT - 84 -...
  • Page 77 EXPLANATION FOR MICOM CIRCUIT (4) GR-L267BV(T,S)PA (Refer to appendix) - 85 -...
  • Page 78 EXPLANATION FOR MICOM CIRCUIT - 86 -...

  • Page 79: Icemaker And Dispenser Working Principles And Repair

    ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 1. Working Principles 1-1. ICEMaker Working Principles Power Input Initial Control • Level Icemaker Cube mold for Initial Control after power is input. Icemaking Control • Wait until the water in the cube mold is frozen after icemaker starts operation.
  • Page 80 ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 2. Function of Icemaker 2-1. Initial Control Function 1. When power is initially applied or reapplied after power cut, it detects level of icemaker cube mold after completion of MICOM initialization. The detecting lever moves up and down. 2.
  • Page 81 ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 2-4. Ice Ejection Control Function 1. This is to eject ice from ice maker cube mold after icemaking is completed. 2. If Hall IC signal is on within 3 6/10 seconds after ice ejection motor rotates in normal direction, it does not proceed ice ejection but waits.

  • Page 82: Icemaker And Dispenser Working Principles And Repair

    ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 2-5 Test Function 1. It is to force the operation during operation test, service, and cleaning. The test switch is mounted under the automatic icemaker. The test function starts when the test switch is pressed for more than 1/2 second. 2.

  • Page 83: Icemaker Troubleshooting

    ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 3. Icemaker Troubleshooting * Troubleshooting: it is possible to confirm by pressing freezer and refrigerator temperature control buttons for more than 1 second. (icemaker is normal if all LEDs are on): refer to trouble diagnosis function in MICOM function 2- 8 (page 21) Is DC Power (5V and 12V) Failed DC Power...

  • Page 84: Icemaker Circuit

    ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 4. Icemaker Circuits (1) GR-L267BV(T)R, BNRY (Refer to appendix) 2) GR-L267BV(T)RA (Refer to appendix) - 92 -...
  • Page 85 ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR (3) GR-L267BV(T,S)PA (Refer to appendix) The above icemaker circuits are applied to GR-L267BV(T)R, GR-L267BV(T)RA, GR-L267BV(T,S)PA and composed of icemaker unit in the freezer and icemaker driving part of main PWB. Water is supplied to the icemaker cube mold through the solenoid relay for ice valve of solenoid valve in the mechanical area by opening valve for the set time.
  • Page 86 CIRCUIT (1) GR-L267BV(T)R (Refer to appendix) SENSOR 3854JD1125A - 94 -...
  • Page 87 CIRCUIT (2) GR-L267BNRY (Refer to appendix) - 95 -...
  • Page 88 CIRCUIT (3) GR-L267BV(T)RA (Refer to appendix) 3854JD1125B - 96 -...

  • Page 89: Circuit

    CIRCUIT (4) GR-L267BV(T,S)PA (Refer to appendix) 3854JD1125C - 97 -...

  • Page 90: 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 91 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 92 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 93: Trouble Diagnosis

    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 94 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 95 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 96 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 97 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 98 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 99 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.
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  • Page 116 TROUBLE DIAGNOSIS - 124 -...
  • Page 117 TROUBLE DIAGNOSIS 3. Sealed System 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 118 TROUBLE DIAGNOSIS 3-2. Summary Of Heavy Repair Process Contents Tools Trouble diagnosis - Cut charging pipe ends and discharge refrigerant from Filter, side cutters Remove refrigerant Residuals drier and compressor. - Use R134a oil and refrigerant for compressor and drier Pipe Cutter, Gas welder, N Parts - Confirm N...
  • Page 119 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 120 TROUBLE DIAGNOSIS 3. Sealed System 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 121 TROUBLE DIAGNOSIS 3-2. Summary Of Heavy Repair Process Contents Tools Trouble diagnosis - Cut charging pipe ends and discharge refrigerant from Filter, side cutters Remove refrigerant Residuals drier and compressor. - Use R134a oil and refrigerant for compressor and drier Pipe Cutter, Gas welder, N Parts - Confirm N...
  • Page 122 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 123 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 124 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 will be more effective. Pipe Connection - Run the compressor Connect the red hose to the high pressure side and the blue hose to while charging the...
  • Page 125 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 make a gas leakage test on the welded parts.
  • Page 126 TROUBLE DIAGNOSIS 3-6. Brazing Reference Drawings PIPE ASSEMBLY, HOT LINE (Freezer) Copper Brazing Copper Brazing Silver Brazing CAPI - TUBE DRIER ASSEMBLY Silver Brazing PIPE ASSEMBLY, JOINT PIPE ASSEMBLY, SUCTION Copper Brazing PIPE ASSEMBLY, CONDENSER ASSEMBLY, WIRE JOINT Copper Brazing Silver Brazing Copper Brazing Coppper Brazing...

  • Page 127: 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 • 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 128 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 129 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 130 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 131 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 132: 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 the Upper Hinge Assembly in the direction of the arrow 1) Remove lower cover and then disconnect water C and pull forward in arrow D direction.

  • Page 133: Handle

    HOW TO DISASSEMBLE AND ASSEMBLE 2. HANDLE 2. Aluminum short handle Model 1) Grasp the handle by both hands and push it upward. 1. Aluminum Handle Model 1) Use a small screwdriver blade in the groove at the side of the Deco Handle to lift and separate the cover. Twist down in the direction of arrow and lift the cover in the direction of arrow...

  • Page 134: Fan Shroud Grille

    HOW TO DISASSEMBLE AND ASSEMBLE 3. FAN SHROUD GRILLE 4. ICEMAKER ASSEMBLY 1) Loosen one screw with a screwdriver blade. 1. Dispenser Model 2) Disassembly of an upper grille fan : Hold upper part of 1) How to disassemble: an upper grille fan and pull forward carefully. (1) Remove ice bin from the freezer compartment.

  • Page 135: Fan And Fan Motor Disassembly

    HOW TO DISASSEMBLE AND ASSEMBLE 5. WATER-VALVE DISASSEMBLY 4). Separate the Cover Back M/C and Valve Screw. METHOD Cover Back M/C 1) Turn off the power of the refrigerator (pull out the plug). Open the F/R Door and disassemble the Lower Cover. 5) Separate the housing and pull out the valve.

  • Page 136: Dispenser

    HOW TO DISASSEMBLE AND ASSEMBLE 7. 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 137 HOW TO DISASSEMBLE AND ASSEMBLE 7) Dispenser Related Parts 277A FRAME ASSEMBLY, DISPLAY COVER, DISPENSER DECO, FRAME DISPLAY PWB(PCB) ASSEMBLY, DISPLAY BUTTON ASSEMBLY BUTTON DECO 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...

  • Page 138: Exploded View

    #EV# EXPLODED VIEW FREEZER DOOR PART: LSC26905TT (Refer to appendix) 200A 202A 210A 205A 210B 210B 210B 201A 203A - 159 -...
  • Page 139 #EV# EXPLODED VIEW REFRIGERATOR DOOR PART: LSC26905TT (Refer to appendix) 230A 241C 232A 239A 240A 240A 205A 240B 240C 233A 231A - 160 -...
  • Page 140 #EV# EXPLODED VIEW FREEZER COMPARTMENT: LSC26905TT (Refer to appendix) 270A 270C 402A 271B 271A 137A 136D 403A 136B 135A 136C 152A 329A 401A 302B 130A 128E 128F 120B 400A 120B 120B 272A 103A 408A 135B 105B 312A 126A - 161 -...
  • Page 141 #EV# EXPLODED VIEW REFRIGERATOR COMPARTMENT: LSC26905TT (Refer to appendix) 140A 270B 270D 402A 271B 271C 626C 171A 141A 626B 626A 140B 171B 116A 115A 624C 170A 408B 152A 140A 401A* 151A 150A 162A 166A 162B 272B 166B 165A 103A 504A...
  • Page 142 #EV# EXPLODED VIEW ICE & WATER PART: LSC26905TT (Refer to appendix) 625A 618A 616E 616F 616G 616D 623A 627A 404A 619A 612A 612C 612B 600A 610A 607A 611A 602A 611C 605A 611B 604A 611D 601A 603B 603A 404B 614A 613A...
  • Page 143 #EV# EXPLODED VIEW MECHANICAL COMPARTMENT: LSC26905TT (Refer to appendix) 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 309B 305A 403B...
  • Page 144 #EV# EXPLODED VIEW DISPEDNSER PART: LSC26905TT (Refer to appendix) 278A 277A 278C 402C 278B 276A 275A 278F 405A 276B 279B 501A 401C 280A 278G 281A 280B 280C 279A - 165 -...
  • Page 145 P/No. 3828JD8797C JULY., 2005 Printed in Korea...

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