LG LRFD25850SB Service Manual
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LG LRFD25850SB Service Manual

Lg lrfd25850sb refrigerator service manual
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See also: User Manual
REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODEL: LRFD25850SB
COLOR:WESTERN BLACK

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Summary of Contents for LG LRFD25850SB

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MODEL: LRFD25850SB COLOR:WESTERN BLACK...

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ............................... 2 1. SPECIFICATIONS................................3 2. PARTS IDENTIFICATION ..............................4 3. DISASSEMBLY................................5-8 REMOVING AND REPLACING REFRIGERATOR DOORS ....................5 DOOR ....................................6-7 TO REMOVE THE DISPENSER ............................7 DOOR ALIGNMENT ................................7 FAN AND FAN MOTOR ..............................8 DEFROST CONTROL ASSEMBLY ............................ 8 LAMP ....................................

  • Page 3: Specifications

    1. SPECIFICATIONS 21 cu. ft. / 25 cu. ft. ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DOOR DESIGN Side Rounded VEGETABLE TRAY Opaque Drawer Type DIMENSIONS (inches) H) 21cu.ft COMPRESSOR PTC Starting Type H) 25cu.ft EVAPORATOR Fin Tube Type 298 (21cu.ft) CONDENSER Wire Condenser NET WEIGHT (pounds) 320 (25cu.ft) REFRIGERANT...

  • Page 4: Parts Identification

    2. PARTS IDENTIFICATION Filter Dairy Bin Refrigerator Light Egg Box Shelves Modular Door Bins Modular Door Bin Wine Holder Optibin Crisper Keeps fruits and vegetable fresh Modular Door Bin and crisp Cover Front Glide N Serve Customcube Icemaker Pull out Drawer Ice Bin Durabase Freezer...

  • Page 5: Disassembly

    3. DISASSEMBLY 3-1 REMOVING AND REPLACING REFRIGERATOR DOORS Removing Refrigerator Door w w CAUTION: Before you begin, unplug the refrigerator. Remove food and bins from doors. u u Left Door 1. Disconnect water supply tube by pushing back on the disconnect ring (4). 2.

  • Page 6: Door

    3-2 DOOR Door Gasket Replacement 1. Insert gasket bracket clips Door Gasket Removal 1) Insert gasket bracket edge beneath door frame edge. 1. Remove door frame cover 2) Turn upper gasket bracket spring so that the spring Starting at top of cover and working down, snap cover ends are in the door channel.

  • Page 7: To Remove The Dispenser

    2) Press gasket into channels on the three remaining 2. Pry off cover dispenser. sides of door. Figure 6 Figure 9 3. Replace door frame cover Starting at top of cover and working down, snap cover Disconnect wire harness. back into door. 3.

  • Page 8: Fan And Fan Motor

    3-5 FAN AND FAN MOTOR 3-7-1 Refrigerator Compartment Lamp 1. Remove the freezer shelf. (If your refrigerator has an 1. Unplug the power cord from the outlet. icemaker, remove the icemaker first) 2. Remove refrigerator shelves. 2. Remove the plastic guide for slides on left side by 3.

  • Page 9: Adjustment

    4. ADJUSTMENT 4-1 COMPRESSOR 4-2-3 PTC-Applied Circuit Diagram Starting Method for the Motor 4-1-1 Role The compressor intakes low temperature and low pressure gas from the evaporator of the refrigerator and compresses OVERLOAD PROTECTOR this gas to high-temperature and high-pressure gas. It then delivers the gas to the condenser.

  • Page 10: Olp (Overload Protector)

    4-3 OLP (OVERLOAD PROTECTOR) 4-4 TO REMOVE THE COVER PTC 4-3-1 Definition of OLP (1) OLP (OVERLOAD PROTECTOR) is attached to the Compressor and protects the Motor by opening the circuit to the Motor if the temperature rises and activating the bimetal spring in the OLP. (2) When high current flows to the Compressor motor, the Bimetal works by heating the heater inside the OLP, and the OLP protects the Motor by cutting off the...

  • Page 11: Circuit Diagram

    5. CIRCUIT DIAGRAM - 11 -...

  • Page 12: Troubleshooting

    6. TROUBLESHOOTING 6-1 COMPRESSOR AND ELECTRIC COMPONENTS (Rated Voltage Remove PTC-Starter Power Source. ±10%)? from Compressor and measure voltage between Terminal C of Compressor and Terminal 5 or 6 of PTC. OLP disconnected? No Voltage. Replace OLP. Check connection condition. Reconnect.

  • Page 13: Ptc And Olp

    6-2 PTC AND OLP Normal operation of Separate PTC-Starter Observation value is Compressor is from Compressor and 115V/60Hz : 6.8 ±30% impossible or poor. measure resistance between No. 5 and 6 of PTC-Starter with a Tester. (Figure 20) Replace PTC- The resistance value Starter.

  • Page 14: Other Electrical Components

    6-3 OTHER ELECTRICAL COMPONENTS Not cooling at all Check for open short or Compressor Cause incorrect resistance readings doesn't run. in the following components a. Starting devices Short, open, or broken. Poor contact b. OLP or shorted. Coil open or shorted. c.

  • Page 15: Service Diagnosis Chart

    6-4 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY No Cooling. • Is the power cord unplugged from the outlet? • Plug into the outlet. • Check if the power switch is set to OFF. • Set the switch to ON. •...

  • Page 16: Refrigeration Cycle

    6-5 REFRIGERATION CYCLE Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE CAUSE REMARKS OF THE THE UNIT EVAPORATOR COMPRESSOR PARTIAL Freezer Low flowing sound of A little higher • Refrigerant level is low due LEAKAGE compartment and Refrigerant is heard and than ambient •...
  • Page 17 6-5-1 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 None Partial Pattern? Equalization Equalization Test Test Very Fast Very Slow Very Slow Very Fast Fast...

  • Page 18: Operation Principle & Repair Method Of Icemaker

    7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER 7-1 OPERATION PRINCIPLE 7-1-1 Operation Principle of IceMaker Power On Start Position • Adjusts EJECTOR to Start Position with power on. Ice Making • Waits until water becomes cold after starting the Mode ice making operation.
  • Page 19 7-2 ICE MAKER FUNCTIONS 7-2-1 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 20 7-2-4 Fill / Park Position 1. Once a normal harvest mode has been completed, the water solenoid will be activated. 2. The amount of water is adjusted by pressing the Fill Key repeatedly. This changes the time allowed for fill as illustrated in the table below.
  • Page 21 7-2-5 Function TEST 1. This is a compulsory operation for TEST, SVC, cleaning, etc. It is operated by pressing and holding the Fill Key for 3 seconds. 2. The test works only in the Ice Making 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 22: Description Of Function & Circuit Of Micom

    8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM 8-1 FUNCTION 8-1-1 Function 1. When the appliance is plugged in, it is set to 37°F for Refrigerator and 0°F for freezer. You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button. 2.
  • Page 23 8-1-6 CONTROL OF FREEZER FAN MOTOR 1. Freezer fan motor has high and standard speeds. 2. High speed is used at power-up, for express freezing, and when refrigerator is overloaded. Standard speeds is used for general purposes. 3. To improve cooling speed, the RPM of the freezer fan motor change from normal speed to high. 4.
  • Page 24 8-1-10 Buzzer Sound When the button on the front Display is pushed, a Ding~ Dong~ sound is produced. (Refer to the Buzzer Circuit 8-2-4 No. 3) 8-1-11 Defrosting (removing frost) 1. Defrosting starts each time the COMPRESSOR running time reaches 7 hours. 2.

  • Page 25: Defect Diagnosis Function

    8-1-15 Defect Diagnosis Function 1. Automatic diagnosis makes servicing the refrigerator easy. 2. When a defect occurs, the buttons will not operate; but the tones. such as ding. will sound. 3. When the defect CODE removes the sign, it returns to normal operation (RESET). 4.
  • Page 26 8-1-16 TEST Mode 1. The Test mode allows checking the PCB and the function of the product as well as finding out the defective part in case of an error. 2. The test mode is operated by pressing two buttons at Display panel. 3.
  • Page 27 8-2 PCB FUNCTION 8-2-1 Power Circuit 1. Power is supplied to the control board at pin7 and 9 od connector #1. - 27 -...
  • Page 28 8-2-2 Load / Buzzer Drive & Open Door Detection Circuit 1. Load Drive Condition Check To measure outputs of the control board, check voltages between the pins for the following components: Circuit Pin Number Pin Number Output Voltage Compressor Con2 pin11 Con1 pin1 115 VAC Condenser fan...
  • Page 29 3. Open Door Detection Circuit Check 8-2-3 Temperature Sensor Circuit Measurement Pin 4 & 5 of con4 Ref.Door Location Freezer/ Pin 5 & 6 of con5 Fre.Door Refrigerator Door Closed Open RESISTANCE OF FREEZER RESISTANCE OF REFRIGERATOR & TEMPERATURE SENSOR DEFROST SENSOR &...
  • Page 30 8-2-4 Refrigeration Compartment Stepping Motor Damper Circuit A reversible DC motor is used to open and close the damper. To open the damper, push test button once. To close the damper, push test button twice. - 30 -...
  • Page 31 8-3 TROUBLESHOOTING PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION POWER 1. The whole 1. FREEZER/ Check if POWER SOURCE is Use boosting TRANS. SOURCE is DISPLAY REFRIGERATOR. FREEZER/REFRIGERA poor. poor. LED/SEVEN TOR DOOR IS OPEN SEGMENT and check display. DISPLAY is off.
  • Page 32 PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION COOLING is 1. If FREEZER Check is FREEZER Make sure the DOOR poor. REFRIGERATOR TEMPERATURE is TEMPERATURE is too isattached. TEMPERATURE normal. low. is too low. 2. If amount of cool air Make sure that the FAN MOTOR is poor.
  • Page 33 8-4 MAIN PWB ASSEMBLY AND PARTS LIST 8-4-1 Main PWB Assembly Connector4 Connector6 Connector5 Connector1 Connector3 Connector2 - 33 -...

  • Page 34: Exploded View & Replacement Parts List

    #EV# 9. EXPLODED VIEW & REPLACEMENT PARTS LIST CASE PARTS CAUTION: Use the part number to order part, not the position number. 207B 402A 103B 406C 271C 271B 103A 624C 410A 207A 409D 624A 624B 406D 501F 402A 624D 271B 271A 610B 282F...
  • Page 35 #EV# FREEZER PARTS CAUTION: Use the part number to order part, not the position number. 145C 136B 145F 248F 131A 237C 177B 136A - 35 -...

  • Page 36: Refrigerator Parts

    #EV# REFRIGERATOR PARTS CAUTION: Use the part number to order part, not the position number. 147C 141B 141A 147B 147A 141B 141A 141C 141B 141A 141C 141B 141A 141C 146A 141D 141C 161E 167B 161A 154A 161D 160B 151C 151A 161C 248A 155J...

  • Page 37: Door Parts

    #EV# DOOR PARTS CAUTION: Use the part number to order part, not the position number. 230B 230A 231B 233B 233C 231A 233D 233A 241A 241B 212G 241C 237A 241C 237A 244D 241C 244E 244D 244E 241C 241C 262C 262C 243A 249A 243A 312B...
  • Page 38 #EV# DISPENSER PARTS CAUTION: Use the part number to order part, not the position number. 616B 280F 280D 279B 279D 276A 113C 276B 279E 403A 616A 406E 279C - 38 -...
  • Page 39 #EV# ICE & MAKER PARTS CAUTION: Use the part number to order part, not the position number. 602A 600A 617A 625A 616G 616D 616G 623B 616C 616H 616F 623B 616H 616E 627A 603A 616F 623A 627B 619A 603B - 39 -...
  • Page 40 P/No. 3828JL8066B FEB., 2005 Printed in Korea...

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