LG WM3885H CA Series Service Manual
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LG WM3885H CA Series Service Manual

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LG WM3875HVCA
Owner's Manual
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Summary of Contents for LG WM3885H CA Series

  • Page 1 This Owner's Manual is provided and hosted by Appliance Factory Parts. LG WM3875HVCA Owner's Manual Shop genuine replacement parts for LG WM3875HVCA Find Your LG Washer Parts - Select From 393 Models -------- Manual continues below --------...
  • Page 2 Website : http://biz.lgservice.com WASHING MACHINE SERVICE MANUAL CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT. MODEL: WM3885H*CA / WM3875H*CA...
  • Page 3 OCT. 2009 PRINTED IN KOREA P/No.: MFL30599154...

  • Page 4: Table Of Contents

    CONTENTS Specifications ..........................5 Features and Technical Explanation .................... 6-8 Parts Identification ........................... 9 Installation and Test ......................... 10-12 Operation ..........................13-19 5-1. Control Panel Features ..................... 13-15 5-2. Cycle Guide ........................... 16 5-3. Special Functions ........................17 5-4. Explanation of Each Process .................... 18-19 Wiring Diagram / Program Chart ....................

  • Page 5: Specifications

    1. SPECIFICATIONS ITEM WM3885H*CA / WM3875H*CA COLOR W : White, C : Chardonnay Steel POWER SUPPLY AC 120 V, 60 Hz PRODUCT WEIGHT 220.5 lbs (100 kg) WASHING 280 W ELECTRIC POWER DRAIN MOTOR 80 W CONSUMPTION WASH HEATER 1000 W REVOLUTION WASH 46 rpm...

  • Page 6: Features And Technical Explanation

    2. FEATURES & TECHNICAL EXPLANATION 2-1. FEATURES Ultra Capacity The larger drum enables not just higher head drop and stronger centrifugal force, but also less tangling and wrinkling of the laundry. Heavier loads, such as king size comforters, blankets, and curtains, can be washed. Direct Drive System The advanced brushless DC motor directly drives the drum without belt and pulley.
  • Page 7 2-2. NEURO FUZZY WASHING TIME OPTIMIZATION To get the best washing performance, optimal time is determined by the water temperature, the selected washing temperature, and the size of the load. water temperature washing time the best selected NEURO- washing rinsing time washing FUZZY temperature...
  • Page 8 2-5. THE DOOR CAN NOT BE OPENED While program is operating. When a power failed and power plug is taken out in operation. While Door Lock lights turn on. White the motor is in the process of inertial rotating, through the operation is paused. 2-6.

  • Page 9: Parts Identification

    3. PARTS IDENTIFICATION Shipping Blots Power Plug • If the supply cord is damaged, it must be replaced by the manufacturer or its authorized service Drain Hose technician in order to avoid a hazard. Dispenser Control Panel Door Cleaning Nozzle Door Cleaning Nozzle Water Circulation &...

  • Page 10: Installation And Test

    4. INSTALLATION & TEST Before servicing, ask the customer what the trouble is. When installing or repairing the washer, put on long gloves and safety glasses. Check the setup (power supply is 120 V , remove the transit bolts, level the washer, etc.) Check with the troubleshooting guide.
  • Page 11 HOW TO CONNECT THE INLET HOSE Verify that the rubber washer is inside of the Cold valve connector. Tighten the inlet hose securely to prevent leaks. Install the inlet hose to correct temperature water tap. Otherwise, it cause drips on the drawer panel handle and drawer panel.
  • Page 12 7 TEST OPERATION Preparation for Press the POWER button. Press the START/PAUSE washing. button. • Connect the power plug to the outlet. • Listen for a click to determine if the • Connect the inlet hoses. door has locked. Check the water heating Check the automatic reverse Check the water supply.

  • Page 13: Operation

    5. OPERATION 5-1. CONTROL PANEL FEATURES WM3885H*CA WM3875H*CA POWER ON/OFF BUTTON SPECIAL FUNCTION BUTTONS Press to turn the washer ON. Press again to turn the washer OFF. The special function buttons allow you to select additional NOTE: Pressing the ON/OFF button during a cycle will cancel that functions and will light when selected.
  • Page 14 Status Indicator Power Button • It shows elapsed time of the cycle the washer is • Use this button to turn the operating. power On/Off. Cycle Selector Knob Start/Pause • Rotate the Cycle selector knob to select the cycle • Use this button to designed for different types of fabric and soil Start/Stop the washer.
  • Page 15 Option Button • STEAM: Use the STEAM button to add steam to the cycle for the extra cleaning. • WASH/RINSE OPTIMIZER : Use the WASH/RINSE OPTIMIZER button to select the water level, and detergent mount automatically by the smart sensor and program. •...

  • Page 16: Cycle Guide

    5-2. Cycle Guide The cycle guide below shows the options and recommended fabric types for each cycle. =Available option NOTE: To protect your garments, not every wash/rinse temperature, spin speed, soil level, or option is available with every cycle.

  • Page 17: Special Functions

    5-3. SPECIAL FUNCTIONS The option buttons also activate special functions, including CHILD LOCK, DRUM LIGHT, FRESH CARE, and LANGUAGE. Press and hold the option button marked with the special function for 3 seconds to activate. CHILD LOCK Use this option to prevent unwanted use of the washer or to keep cycle settings from being changed while the washer is operating.

  • Page 18: Explanation Of Each Process

    5-4. Explanation of each process Process Explanation Stay • Electrical power is supplied. • Washer is ready to work and the micom is in the active mode. Water • After loading laundry and selecting a course and a cycle, water is supply supplied and drum rotates.
  • Page 19 Process Explanation Intermittent • To reach the correct set speed, the motor rotates clockwise and spin counterclockwise directions after spin process starts. • If the water level frequency is lower than 23.0 kHz, a washer senses suds and starts suds removal process. Rinse •...

  • Page 20: Wiring Diagram / Program Chart

    6. WIRING DIAGRAM / PROGRAM CHART...

  • Page 22: Test Mode

    7. TEST MODE 7-1. SAFETY CAUTION Both 120 volts AC and DC voltages are present on the main board. Be careful to avoid a shock hazard. Be careful electric shock when disconnecting parts while trouble shooting. (Wear Electro Static Discharge gloves when working.) After cutting off the power when changing PWB assembly, disconnect or assemble.

  • Page 23: How To Read The Display In Load Test Mode

    7-3. HOW TO READ THE DISPLAY IN LOAD TEST MODE Water level frequency Wash temperature Vibration sensor error Steam temperature 7-4. HOW TO CHECK THE WATER LEVEL FREQUENCY AND VIBRATION SENSOR ERROR * Press the WASH/RINSE and SOIL LEVEL buttons simultaneously. The digits indicate the operation of the vibration sensor.

  • Page 24: Troubleshooting

    8. TROUBLESHOOTING 8-1. SAFETY CAUTION Both 120 volts AC and DC voltages are present on the main board. Be careful to avoid a shock hazard. After cutting off the power when changing PWB assembly, disconnect or assemble. Be careful static when handling PWB assembly, and use Electro Static Discharge plastic pack when delivering or keeping it.
  • Page 25 ERROR SYMPTOM CAUSE LE ERROR • The connector (3-pin, male, white) in the MOTOR LOCKED MOTOR SEE OWNER`S MANUAL. HARNESS is not connected to the connector (3-pin, ERROR (LGUS)1-800-243-0000 (LGCANADA)1-888-542-2623 female, white) of STATOR ASSEMBLY. • The electric contact between the connectors (3-pin, male, white) in the MOTOR HARNESS and 4-pin, female, white connector in the MAIN PWB ASSEMBLY is bad or unstable.

  • Page 26: Troubleshooting Summary

    8-3. TROUBLESHOOTING SUMMARY...

  • Page 27: Troubleshooting With Error

    8-4. TROUBLESHOOTING WITH ERROR INLET VALVE ERROR Replace the Is the voltage of the inlet INLET VALVE valve connector 120 V AC? ASSEMBLY. (Check the all terminal of INLET VALVE ASSEMBLY displayed? IE ERROR while the power is on.) Check the AIR When you press both CHAMBER WASH/RINSE button and...
  • Page 28 DRAIN ERROR displayed? OE ERROR Is the coil of the drain Replace the Reconnect or Is the connector connected pump too high or low? DRAIN PUMP repair to pump motor assembly (resistance of the coil ASSEMBLY. the connector. disconnected or is 10-20Ω) disassembled? (Refer to 9-4 Pump motor...
  • Page 29 HEATING ERROR Reconnect or Is the connector connected to repair thermistor disconnected or the connector. disassembled? displayed? tE ERROR Reconnect or Is the connector connected to repair heater disconnected or the connector. disassembled? Steam generator thermistor Steam generator heater Wash thermistor Replace the Is thermistor resistance THERMISTOR...
  • Page 30 - part of motor LOCKED MOTOR ERROR displayed? LE ERROR Reconnect Check the connectors below. Motor the connector. Is the connector disconnected (connector / or disassembled? wire / motor ) (motor hall sensor connector, Replace Is rotor magnet cracked? motor drive connector.) the ROTOR.
  • Page 31 DOOR OPEN ERROR Replace the Is there clicking sound once displayed? dE ERROR or twice when the ASSEMBLY. START/PAUSE button is pressed to start the cycle? Reconnect or Is the connector connected repair to door switch or main PWB Replace the Is DOOR SWITCH the connector.
  • Page 32 UNBALANCE ERROR OVER FLOW ERROR displayed? displayed? UE ERROR FE ERROR When you press both Check the AIR Put laundry Does the laundry lean WASH/RINSE button and CHAMBER evenly toward one side, not evenly SOIL LEVEL button and the tube In the DRUM put in the DRUM assembly? simultaneously, is the...
  • Page 33 PRESSURE SENSOR ERROR displayed? PE ERROR Reconnect or Is the connector connected repair to pressure sensor the connector. disconnected or disassembled? Replace the Is the resistance of the pressure pressure sensor out of switch. range? (pin 1~ pin 3) (21~23 Ω ±10%) Fix the air Is the AIR CHAMBER and chamber...

  • Page 34: Troubleshooting Else

    8-5. TROUBLESHOOTING ELSE CAUTION 1. Be careful of electric shock if disconnecting parts while troubleshooting. 2. First of all, check the connection of each electrical terminal with the wiring diagram. 3. If you replace the MAIN PWB ASSEMBLY, reinsert the connectors correctly. NO POWER Replace the Is LED on while the power...
  • Page 35 BUTTON DOESN’T WORK Reconnect or Is the connector connected Repair to Main PWB / Display the connector. PWB disconnected or disassembled? Replace the Is the display PCB broken? DISPLAY (check the buzzer sound and LED light while push the ASSEMBLY. button.) Repair the Is the button of panel stuck?
  • Page 36 VIBRATION & NOISE IN SPIN Put an unbalance part (rubber) inside of drum and start QC test mode and run in high spin. Remove the Have all the transit bolts (Refer to section 7-2.) transit bolts and base packing been When the machine is and Base removed?
  • Page 37 VIBRATION SENSOR CHECK Check the Is each terminal open? Replace the 1. When you press both leveling of (Check the all terminal of vibration WASH/RINSE button and washer, the vibration sensor’s sensor SOIL LEVEL button simultaneously, is the transit bolts connector.
  • Page 38 DETERGENT DOES NOT FLOW IN Refer to Is water supplied? NO WATER SUPPLY. Are receptacles correctly Check the connected to the terminals wiring. of the INLET VALVE ASSEMBLY? Prewash Hot water Main wash Bleach Steam Has detergent been put in Put the the correct compartment detergent in...
  • Page 39 LIQUID DETERGENT/SOFTENER/ ABNORMAL SOUND BLEACH DOES NOT FLOW IN Refer to Secure the Is the motor bolt loosened? Is water supplied? NO WATER bolt. SUPPLY. Are the plugs correctly Check the connected to the terminals of wiring on the the INLET VALVE dispenser.

  • Page 40: Component Testing Information

    9. COMPONENT TESTING INFORMATION When Resistance (Ohm) checking the Component, be sure to turn the power off, WARNING and do voltage discharge sufficiently. 9-1. FILTER ASSEMBLY (LINE FILTER) Wiring Circuit in the MAIN PWB / Wiring Diagram diagram MAIN PWB ASSEMBLY FUSE Test...

  • Page 41: Door Look Switch Assembly

    9-2. DOOR LOCK SWITCH ASSEMBLY Wiring Circuit in the MAIN PWB / Wiring Diagram diagram MAIN PWB MICOM Relay Relay Common terminal of valve Door switch The door lock switch assembly consists of a heating PTC, a bimetal, Function a protection PTC, and a solenoid. It locks the door during the wash cycle. 1.
  • Page 42 Test points Result Test Points Result Remarks 700-1500 Ω (2) to (4) At 77 °F °C 60-90 Ω (3) to (4) At 77 °F °C (4) to (5) Infinity (2) to (4) 120 Vac Voltage Input...

  • Page 43: Stator Assembly

    9-3. STATOR ASSEMBLY Wiring Circuit in the MAIN PWB / Wiring Diagram diagram MAIN PWB NA1NA MICOM Function The Direct Drive motor can be driven from stopped to maximum speed in infinite steps in either direction. There are 36 poles on the stator; 12 permanent magnets spaced around the rotor. There are no brushes to wear out.
  • Page 44 The hall sensor determines the speed and direction of the motor. It also can read that the load is off balance when the drum speed fluctuates. Test point - Voltage Testing Hall Sensor at Stator Result (Hall Sensor) (2) (4) (1) (3) (5) If measuring voltage from the Main PCB Assembly to the Hall Sensor, use the following steps:...
  • Page 45 7. To measure output signal voltage from the hall sensor, carefully move test leads to terminals 1 to 4, blue and gray. Slowly rotate motor rotor by hand. You should read a pulsing 10 V . If 10 V is measured from 1 to 4, move lead on blue wire to red wire, terminal 2.

  • Page 46: Pump Motor Assembly

    9-4. PUMP MOTOR ASSEMBLY Wiring Circuit in the MAIN PWB Wiring Diagram diagram MAIN PWB 1 2 3 1 2 3 1 2 3 4 1 2 3 3 2 1 MICOM 3 2 1 CONNECTOR Pump Driving circuit DRAIN CIRCULATION PUMP PUMP...

  • Page 47: Inlet Valve Assembly

    9-5. INLET VALVE ASSEMBLY Wiring Circuit in the MAIN PWB diagram MICOM CONNECTOR Inlet valve driving circuit INLET VALVE Wiring Diagram MIAN PWB COMMON GY YL (BK) MAIN BLEACH VALVE WASH VALVE WASH INLET VALVE * Each circuits of loads in wiring diagram are all same. Depending on the cycle and water temperature, the controller will energize the hot or cold Function water valve solenoids to meet the selected water temperature.

  • Page 48: Heater Assembly

    9-6. HEATER ASSEMBLY Wiring Circuit in the MAIN PWB Wiring diagram diagram MAIN PWB (X71) (X135) (X134) X100 MICOM Heater Tab Relay STEAM Heater driving circuit WASH GENERATOR HEATER HEATER * Each circuits of loads in wiring diagram are all same. 1.

  • Page 49: Thermistor Assembly

    9-7. THERMISTOR ASSEMBLY Wiring Circuit in the MAIN PWB / Wiring Diagram diagram MAIN PWB MICOM WASH STEAM THERMISTOR GENERATOR THERMISTOR The thermistor (temperature sensor) is used to monitor water temperature in the tub Function or steam generator. Test points (1) (2) (1) (2) Wash Thermistor...
  • Page 50 Result Wash Thermistor Test Points Result Remarks (tolerance ±5%) (1) to (2) At 86°F (30°C) 39.5 kΩ At 104°F (40°C) 26.1 kΩ At 140°F (60°C) 12.1 kΩ 8.5 kΩ At 158°F (70°C) At 203°F (95°C) 3.8 kΩ At 221°F (105°C) 2.8 kΩ...

  • Page 51: Steam Generator Assembly

    9-8. STEAM GENERATOR ASSEMBLY Wiring Steam generator Water level sensor diagram circuit in the MAIN PWB / wiring diagram MAIN PWB DC5V IC 2 IC 1 Input A PHOTO (long) COUPLER MICOM Input B (short) GND L S SENSOR Heater & Thermistor : Refer to the 9-6 / 9-7 Original THERMISTOR HEATER...
  • Page 52 2) Operation mechanism of Steam generator Function After supplying some amount of water through inlet valve and water level sensor, the heater operates and steam generates. Generated steam is sprayed by nozzle. If the water in the steam generator is reduced by spraying steam, the water level sensor signals the board to refill the steam generator.

  • Page 53: Lamp

    9-9. LAMP Wiring Circuit in the MAIN PWB / Wiring Diagram diagram 16.5V MAIN PWB MICOM 1 2 3 1 2 3 RD BK LAMP Function The Lamp (Drum Light) comes on when the POWER button is pressed. It goes off when the door is closed and the washer starts operation.

  • Page 54: Vibration Sensor Assembly

    9-10. VIBRATION SENSOR ASSEMBLY Wiring Circuit in the MAIN PWB / Wiring Diagram diagram MAIN PWB BL2 BL MICOM Function The vibration sensor is designed to decrease the vibration of the washing machine. It is attached to the top of the tub. It estimates the vibration of washing machine’s tub during drying.

  • Page 55: Disassembly Instructions

    10. DISASSEMBLY INSTRUCTIONS Be sure to unplug the machine before disassembling and repairing the parts. CONTROL PANEL 1 Unscrew 2 screws on the back of the top plate. TOP PLATE ASSEMBLY 2 Pull the top plate backward and upward as shown.
  • Page 56 MAIN PWB ASSEMBLY Disconnect the POWER connector and the pressure switch assembly. Remove the protective cover. PROTECT COVER Disconnect the connectors. Unscrew 1 screw on the back. Remove the main PWB.
  • Page 57 DISPENSER ASSEMBLY Disassemble the top plate assembly. Pull out the drawer. Push out the dispenser assembly after unscrewing 2 screws. DRAWER Unscrew the clamp nut at the lower part of the dispenser. Disassemble the 4 connectors from the valves. Wire Color Blue Housing (YL-BK) Red Housing (VT-BK) White Housing (WH-BK)
  • Page 58 CABINET COVER Unscrew the 5 screws from upper of the cabinet cover. Unscrew the screw from the filter cover. Put a flat ( - ) screwdriver or putty knife into the hinge slots at the bottom of the cover and pry it out.
  • Page 59 Open the door. Disassemble the clamp assembly. Tilt the cabinet cover. Disconnect the door switch connector. NOTE : When assembling the cabinet cover, connect the door switch connector. Lift and separate the cabinet cover. Disassemble the clamp assembly. Disassemble the gasket.
  • Page 60 DOOR Open the door. Unscrew the 4 screws from the hinge. (Use the 8mm tool.) Disassemble the door upward. DOOR LOCK SWITCH ASSEMBLY Open the door and remove the gasket using the special gasket pliers. Unscrew the 2 screws. NOTE •...
  • Page 61 PUMP Disassemble the cabinet cover. CIRCULATION Separate the pump hose, the bellows, the HOSE circulation hose assembly from the pump PUMP HOSE assembly. BELLOWS Disassemble the pump assembly. HEATER Disassemble the cabinet cover. Separate 2 connectors from the heater. Loosen the nut and pull out the heater. CAUTION •...
  • Page 62 WHEN FOREIGN OBJECT IS STUCK BETWEEN DRUM AND TUB Disassemble the cabinet cover. Separate the heater from the tub. Remove any foreign objects (wire, coin, etc.) by inserting a long bar in the opening. LAMP ASSEMBLY Unscrew 2 screws on the back of the top plate. TOP PLATE ASSEMBLY Pull the top plate backward and upward as shown.
  • Page 63 MOTOR/DAMPER Disassemble the back cover. Rotor Remove the bolt. Pull out the rotor. Bolt Unscrew the 2 screws from the tub bracket. Remove the 6 bolts on the stator. Unplug the 2 connectors from the stator. Disassemble the damper hinges from the tub DAMPER HINGE, and base.
  • Page 64 Checking the TSG (TURBO STEAM GENERATOR) To check out the fault diagnosis of TSG, you can pull out the plug and let the water drain away. Be cautious in case of the TSG is hot. TSG (TURBO STEAM GENERATOR) Remove the housing attached to the TSG. (Heater, Water level frequency-sensor, Thermistor.) Remove the screw of the TSG and body frame.
  • Page 65 Remove the screws from both ends of the frame rail. Separate the hoses from the TSG. Remove the body frame and then separate the Body Frame TSG from the washer.

  • Page 66: Exploded View

    11. EXPLODED VIEW 11-1. CABINET & CONTROL PANEL ASSEMBLY M400 M410 G001 G002 F215 G003 G004 G006 A485 G007 G010 *Non-Skid pads F210 F110 A455 A450 A106 A104 A105 A102 A111 A110 A410 A103 A150 A152 A154 A101 A141 A390 A153 A151 A100...

  • Page 67: Drum And Tub Assembly

    11-2 . DRUM & TUB ASSEMBLY K123 K351 K350 K360 K143 K610 F140 K411 K611 K115 K410 K141 F466 K110 K117 K111 K150 K140 K571 F315 F310 K142 F465 K572 K160 K190 F463 K570 K513 F464 K122 K125 K516 K130 K320 K530 K121...

  • Page 68: Dispenser Assembly

    11-3. DISPENSER ASSEMBLY F322 F323 F462 F321 Inlet Valve Filter SVC F180 F300 COLD (BLUE) HOT (ORANGE) F170 F160 F227 F226 F329 F225 F430 F220 F441 F120 HOT (RED) A275 F130 COLD (BLUE) A276 F432...

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