LG LFC25765ST Service Manual
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LG LFC25765ST Service Manual

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See also: Owner's Manual
REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE PRODUCT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODELS : LFC25765ST
LFC25765SW
LFC25765SB

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Summary of Contents for LG LFC25765ST

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE PRODUCT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MODELS : LFC25765ST LFC25765SW LFC25765SB...

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ............................... 2 1.SPECIFICATIONS ................................... 3 2.PARTS IDENTIFICATION ............................... 4 3.DISASSEMBLY ..................................5-9 DOOR ....................................5-6 DOOR ALIGNMENT ................................6 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER ................... 7-9 4.ADJUSTMENT ..................................10 COMPRESSOR .................................

  • Page 3: Specifications

    1. SPECIFICATIONS MODELS LFC25765SW LFC25765SB LFC25765ST SPECIFICATIONS Color WHITE BLACK STAINLESS Dimensions (in) 32 23/32 X 28 30/32 X 69 3/4 (WXDXH) Net Weight (lb) 277 lb Capacity 25cu.ft. Refrigerant R134A(125gr) Climate Class TEMPERATURE (N) Rated Rating 115/60 Cooling System...
  • Page 4 DIMENSIONS Description LFC25765** Depth w/ Handles Depth w/o Handles Depth w/o Door 46 ¼ Depth (Total with Door Open) Height to Top of Case Height to Top of Door Hinge Width 32 ¾ 41 ¼ Width (door open 90 deg. w/o handle) Width (door open 90 deg.

  • Page 5: Parts Identification

    2. PARTS IDENTIFICATION Digital Sensor Control Dairy Bin Refrigerator Light Shelves Modular Door Bin Modular Door Bin Bottle Holder Optibin Crisper Keeps fruits and vegetable fresh and crisp Modular Door Bin Glide'N'Serve AUTOMATIC ICEMAKER Pullout Drawer Ice Bin Durabase Divider - 4 -...

  • Page 6: Disassembly

    3. DISASSEMBLY 3-1 DOOR Refrigerator door 1. Remove the top hinge cover and disconnect the wire Gasket harness. Bracket Clip Door 2. Remove the ground screw. Frame 3. Rotate the lever hinge and lift off hinge. 4. Lift off the refrigerator door. Flat Tip 5.

  • Page 7: Door Alignment

    2. Insert gasket into channel 3-2 DOOR ALIGNMENT 1) Snap gasket assembly into the door bracket. If the space between your doors is uneven, follow the Inserting the gasket assembly into the bracket door instructions below to align the doors: 1.

  • Page 8: How To Remove And Reinstall The Pullout Drawer

    3-3 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER 3-3-1 FOLLOW STEPS TO REMOVE Step 1) Open the freezer door. Step 2) Remove the lower basket. Step 3) Remove the two screws from the guide rails (one Step 4) Lift the freezer door up to unhook it from the rail from each side).
  • Page 9 3-3-2 FOLLOW STEPS TO REINSTALL Step 1) Reinstall the right side gear into the clip. Step 2) Insert the rail into the right side gear. Gears do not Step 3) Insert the rail into the left side gear, and insert the need to be perpendicular to each other.
  • Page 10 3-3-3 PULL OUT DRAWER To separate the drawer, push the front left and right hooks in direction to pull up and remove. Then gently lift the gear part of rear left and right side of the drawer and pull it out in direction.
  • Page 11 4. ADJUSTMENT 4-1 COMPRESSOR 4-2-3 Compressor protection logic Since linear Comp conducts linear reciprocating motion, 4-1-1 Role we have protection logic for compressor, motor and PCB The compressor intakes low temperature and low pressure as the below. gas from the evaporator of the refrigerator and compresses this gas to high-temperature and high-pressure gas.

  • Page 12: Circuit Diagram

    5. CIRCUIT DIAGRAM CIRCUIT DIAGRAM F/L DOOR S/W ,PLUG TYPE,SMART BUZZER, REACTOR, FUSE AND COMP' EARTH PART ON CIRCUIT DIAGRAM ARE SUBJECT TO CHANGE IN DIFFERENT LOCALITIES AND MODEL TYPE. - N: NEUTRAL STEPPING WH/BK MOTOR F/L DOOR S/W PLUG TYPE REACTOR NEUTRAL YL/BL...

  • Page 13: Troubleshooting

    6. TROUBLESHOOTING 6-1 Error Code Summary WARNING:When you check the Resistance values, be sure to turn off the power. And wait for the voltage-discharge sufficiently. Error Display Error Detection Error Generation Factors Remark Freezer Ref. Category Temperature Temperature Normality None Normal operation of Display Freezer Sensor Short or Disconnection...

  • Page 14: Pcb Picture

    7. PCB Picture 7-1 Main PCB P/No & MFG Picture CON2 CON3 EBR73304219 (2011.07~) CON4 - 13 -...

  • Page 15: Display Pcb & Sub Pcb

    7-2 Display PCB & Sub PCB P/No Picture CON01 Display PCB EBR42479302 (2010.07~) - 14 -...

  • Page 16: Troubleshooting With Error Display

    8. Troubleshooting With Error Display 8-1 Freezer Sensor Error (Er FS) Checking flow Result & SVC Action Check for a loose connection. Check the Blue/White to Result SVC Action Blue/White. Short Change the sensor Open Replace the refrigerator Check the Temp and Normal resistance (Table-1) <Temperature table-1>...
  • Page 17 8-2 Refrigerator Sensor Error (Er rS) Checking flow Result & SVC Action Check for a loose connection. Check the White to White. Result SVC Action Short Change the sensor Open Replace the refrigerator Check the Temp and Normal resistance (Table-2) <Temperature table-2>...
  • Page 18 8-3 Icing Sensor Error (Er IS) Checking flow Result & SVC Action Check for a loose connection. Check the Red to Bright Orange. Result SVC Action Short Change the sensor Open Replace the refrigerator Check the Temp and Normal resistance (Table-1) <Temperature table-1>...
  • Page 19 8-4 Defrost Sensor Error (F dS) Checking flow Result & SVC Action Check for a loose connection. Check the Orange to Orange. Result SVC Action Short Change the sensor Open Replace the refrigerator Check the Temp and Normal resistance (Table-3) Check the Brown to Brown.
  • Page 20 8-5 Defrost Heater Error (Er dH) Checking flow Result & SVC Action Check the Door gasket. Part Result SVC Action Go to the 3 Check the Defrost control part. Fuse-M Change Fuse-M Go to the 3 34 ~ 42 Fuse Sensor Heater Change Fuse-M...
  • Page 21 8-6 Freezer Fan Error (Er FF) Checking flow Result & SVC Action Reset the unit and Input Test 1 Mode. (Push the button 1 time) Open the freezer door and Check the Status SVC Action air flow. No windy Go to 3 While an error code is displayed, the fan is not working.
  • Page 22 8-7 Condenser Fan Error (Er CF) Checking flow Result & SVC Action Reset the unit and Input Test 1 Mode. (Push the button 1 time) Check the fan rotating. Status SVC Action While an error code is displayed, No windy Check motor the fan is not working.
  • Page 23 8-8 Communication Error (Er CO) Checking flow Result & SVC Action Check the loose connection. Check the Orange to White/Black. Result SVC Action 12 V Go to the 3 Check the Hinge CON101 Other (loose connection) Change the Main PCB <Display>...

  • Page 24: Troubleshooting Without Error Display

    9. Troubleshooting Without Error Display 9-1 Freezer room AC Bulb Lamp doesn’t work Checking flow Result & SVC Action Check the Freezer door switch. If feel sticky, Change the door s/w. Check the door S/W resistance. Status Result SVC Action Go to the 3 Normal Change door S/W...
  • Page 25 9-2 Refrigerator room lamp doesn’t work Checking flow Result & SVC Action Check the Refrigerator door switch. If feel sticky, Change the door s/w. Check the door S/W resistance. Status Result SVC Action Go to the 3 Normal Change door S/W Infinity Go to the 3 Infinity...
  • Page 26 9-3 Poor cooling in Fresh food section Checking flow Result & SVC Action Check the sensor resistance. (1) To (2) Result 23°F / -5°C 38.5 ~ 36.5 <CON7> 32°F / 0°C 30.5 ~ 29.5 41°F / 5°C 24.5 ~ 23.5 50°F / 10°C 20 ~ 19 16 ~15.5...
  • Page 27 Checking flow Result & SVC Action Damper checking method. Test Damper Inputting TEST Mode, SVC Action Mode State Check the damper and PCB. 1 Mode Open Damper is normal. (Explain to customer) 2 Mode Closed Change the damper mode working Test Point Result SVC Action...
  • Page 28 9-4 Poor cooling in Freezer compratment Checking flow Result & SVC Action Check the sensor resistance. (1) To (2) Result -22°F / -30°C 40.5 ~ 38.5 -13°F / -25°C 30.5 ~ 28.5 <CON7> -4°F / -20°C 23 ~ 21.5 5°F / -15°C 17.5 ~ 16.5 13.5 ~ 12.5 14°F / -10°C...
  • Page 29 9-5 Over cooling in Fresh food compartment Checking flow Result & SVC Action Check the sensor resistance. (1) To (2) Result 23°F / -5°C 38.5 ~ 36.5 32°F / 0°C 30.5 ~ 29.5 24.5 ~ 23.5 41°F / 5°C 20 ~ 19 50°F / 10°C The sensor is determined by 16 ~15.5...

  • Page 30: Reference

    10. Reference 10-1 TEST MODE and Removing TPA 1. How to make TEST MODE If you push the test button on the Main PCB, the refrigerator will be enter the TEST MODE. * 1 time : Comp / Damper / All FAN on (All things displayed) * 2 times : Damper closed (22 22 displayed)
  • Page 31 10-2 TEMPERATRUE CHART - FRZ AND ICING SENSOR TEMP RESISTANCE VOLTAGE -39°F (-40°C) 4.09 V 73.29 -30°F (-35°C) 3.84 V 53.63 -21°F (-30°C) 3.55 V 39.66 -13°F (-25°C) 3.23 V 29.62 -4°F (-20°C) 2.89 V 22.33 5°F (-15°C) 16.99 2.56 V 14°F (-10°C) 13.05 2.23 V...
  • Page 32 10-3 TEMPERATRUE CHART - REF AND DEF SENSOR TEMP RESISTANCE VOLTAGE -39°F (-40°C) 4.48 V 225.1 -30°F (-35°C) 4.33 V 169.8 -21°F (-30°C) 4.16 V 129.3 -13°F (-25°C) 3.95 V 99.30 -4°F (-20°C) 3.734 V 76.96 5°F (-15°C) 60.13 3.487 V 14°F (-10°C) 47.34 3.22 V...
  • Page 33 10-4 How to check the Fan-Error (1) EBR673480 After sending a signal to the fan, the MICOM checks the BLDC fan motor s lock status. If there is no feedback signal from the BLDC fan, the fan motor stops for 10 seconds and then is powered again for 15 seconds.

  • Page 34: Component Testing Information

    11. COMPONENT TESTING INFORMATION 11-1 Defrost Controller Assembly Function - Controller assembly is consist of 2 kinds of part those are fuse-m and sensor. we can decide part is defect or not when we check the resistance. - Fuse-m can cut off the source when defrost heater operate the unusual high temperature. - Sensor give temperature information to Micom How to Set a ohmmeter to the 2 housing pin.
  • Page 35 11-2 Sheath Heater Function Sheath heater is a part for defrost. All heating wire is connected to only one line. So we can decide part is defect or not when we check the resistance. How to Measure (1) (2) Set a ohmmeter connect to The 2 housing pin. Measure the 2 pin connected to Sheath Heater.
  • Page 36 11-3 Door Heater Assembly Function The heater is designed to prevent the raising dew from door. How to Measure Standard Test Point Ressult (1) to (2) 2.3 ~ 2.9 ? - 35 -...
  • Page 37 11-4 Door Switch Function The switch sense if the door open or close. - When the door open, lamp on. - When the door open, the switch give information to Micom. When the door open, internal contact operate on and off moving plunger of door switch up and down.
  • Page 38 11-7 Damper Function The damper supplies the cold air at freezer room to chillroom by using the damper’s plate. Chillroom is colder than before when damper’s plate is open. When damper’s plate is close, chillroom’s temperature will rise. How to Measure <...
  • Page 39 11-8 Lamp Socket Function The lamp socket connect cover lamp assembly to lamp. The lamp socket fix lamp and unite lamp and cover lamp assembly. The lamp socket supply electric source to lamp also. How to Measure Check the resistance between connector of housing and connector of lamp socket. It means check whether or not applying an electric current.

  • Page 40: Test Mode

    12. TROUBLESHOOTING PCB Check (Simplify) Protection Logic TEST 1 Mode A-inverter Con202 Time>30sec Power Off Power On PCB OK Disconnect & V 200 Replace Driver PCB Check Voltage about 200V past 30second after turn on Test Mode Comp Ref. Display & sound Refer FC75(A-Inverter) TEST1...
  • Page 41 IPM Output check - Measure the voltage between the POWER and COMM pins of the connector as shown below. Check to make sure compressor is receiving voltage from IPM - In order to determine whether the compressor is operating normally, check the output voltage during the refrigeration cycle.
  • Page 42 12-2 Check B B2. LED blinks two times, then repeats (Stroke Trip: A & E Inverters) Protection Logic Blink Blink OFF Blink Blink OFF - Purpose: Prevent abnormally long piston strokes. - Case 1. If compressor doesn’t work and LED blinks - Cause: Possibly harness from compressor to PCB might be defective.
  • Page 43 B3. LED blinks five times, then repeats (Locked Piston: A & E Inverters) Protection Logic Blink Blink Blink Blink Blink OFF - Purpose: To detect locked piston - Cause: Lack of oil to the cylinder, cylinder or piston damaged and or restricted discharge. A Locked Piston can also be caused by foreign materials inside the compressor.
  • Page 44 B5. LED blinks seven times, then repeats (IPM Fault: A & E Inverters) Protection Logic Blink Blink Blink Blink Blink Blink Blink OFF - Purpose: Prevent high current due to IPM Short - Cause: Damaged IPM (Dead Short) - Test for a dead short at Point A with a VOM. - Logic: Compressor is forced off and tries to restart in 2.5 minutes.
  • Page 45 12-3 Check C C1. Harness Connection Check Check Process C2. Capacitor Specifications C3. Compressor Check - Step 1. Power off. Step 2. Check capacitor spec. (table1). Step3. Check resistance of point A Step 4. Check wire harness (INF ohm). Step 5. Check resistance at point B. Step 6. Point D. Check Check Harness...
  • Page 46 12-4 Check D D1. Activate Protection logic Cycle check with protection logic - We have to check Condenser fan and Freezer fan before performing Check D - Locked Piston, Current trip and stroke trip can be activated by other problems then the driver or compressor. 　...
  • Page 47 LED operating condition Cause Service guideline 1. Please check, Whether connector of PCB Parts compressor is attached defect or rightly or not. after LED two - time repetiton (Stroke Trip) Compress power off 2. After the first action, Connector You check on normal miss operation of - off -...
  • Page 48 12-5 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY • Is the power cord unplugged from the outlet? • Plug into the outlet. No Cooling. • Check if the power switch is set to OFF. • Set the switch to ON. •...
  • Page 49 12-6 REFRIGERATION CYCLE Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE OF THE CAUSE REMARKS THE UNIT EVAPORATOR COMPRESSOR PARTIAL Freezer Low flowing sound of A little higher than • Refrigerant level is low due LEAKAGE compartment and Refrigerant is heard ambient to a leak.
  • Page 50 12-6-2 SEALED SYSTEM DIAGNOSIS “Not Cooling” Complaint All components operating, No airflow problems, Not frosted up as a defrost problem problem has been isolated to sealed system area Frost Partial None Pattern? Equalization Equalization Test Test Very Fast Very Slow Very Slow Very Fast Fast...

  • Page 51: Ice Maker And Dispenser Working Principles And Repair

    13. ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 13-1 Working Principles 13-1-1 Ice Maker Working Principles Power Input Level Ice Maker Cube Mould for “Initial Control” Initial Control after power is input. Ice Making Wait until the water in the cube mould is frozen Control after ice maker starts operation.
  • Page 52 13-2 Function of Ice Maker 13-2-1 Initial Control Function 1. When power is initially applied or reapplied after power cut, it detects level of ice maker cube mould after completion of MICOM initialization. The detecting lever moves up and down. 2.
  • Page 53 13-2-4 Ice Ejection Control Function 1. This is to eject ice from ice maker cube mould after ice making is completed. 2. If Hall IC signal is on within 3.6 seconds after ice ejection motor rotates in normal direction, it does not proceed ice ejection but waits.
  • Page 54 13-2-5 Test Function 1. It is to force the operation during operation test, service, and cleaning. The test switch is mounted under the automatic ice maker. The test function starts when the test switch is pressed for more than 0.5 second. 2.

  • Page 55: Exploded View

    #EV# 9. EXPLODED VIEW CASE PARTS 503F CAUTION: Use the part number to order part, not the position number. 103B 409D 281A 409A 402A 158A 103A 282E 280A 271B 402A 282F 271A 120A 501F 145A 120B 501A 411A 282D 304A 106B 282B 145B...
  • Page 56 #EV# FREEZER PARTS Caution: Use the part number to order part, not the position number. 133B 136B 145C 131A 136C 133A 145F 132P 136A 136D 237A - 55 -...
  • Page 57 #EV# REFRIGERATOR PARTS Caution: Use the part number to order part, not the position number. 140E 140E 141A 141A 141B 141B 140D 140D 140E 140E 141A 141A 141B 141B 140D 140D - 56 -...
  • Page 58 #EV# REFRIGERATOR PARTS (PANTRY) Caution: Use the part number to order part, not the position number. 167B 154A 145J 151B 145G 151A 145H 128B 154B 170A 128A - 57 -...
  • Page 59 #EV# DOOR PARTS CAUTION: Use the part number to order part, not the position number. 241F 230A 230B 104E 231A 233A 231B 233B 212G 241C 241C 233J 212K 212K 241C 241C 244A 244A 212J 241E 212J 241E 212K 212K 243D 243C 262C 262E...
  • Page 60 #EV# ICEMAKER PARTS CAUTION: Use the part number to order part, not the position number. 600A 622B 627A 616E 619C - 59 -...
  • Page 61 P/No. MFL47912330...

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