LG WM2050C Series Service Manual
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LG WM2050C Series Service Manual

Washing machine
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WASHING MACHINE

SERVICE MANUAL

CAUTION
!
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
MODEL: WM2050C*
Website: http: //www.LGEservice.com
E-mail: http: //www.LGEservice.com/techsup.html
100

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Summary of Contents for LG WM2050C Series

  • Page 1: Washing Machine

    Website: http: //www.LGEservice.com E-mail: http: //www.LGEservice.com/techsup.html WASHING MACHINE SERVICE MANUAL CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT. MODEL: WM2050C*...
  • Page 2 MAY. 2009 PRINTED IN KOREA P/No.: MFL30599149...

  • Page 3: Table Of Contents

    CONTENTS 1. SPECIFICATIONS ....................... 3 2. FEATURES AND TECHNICAL EXPLANATION ..............4 3. PARTS IDENTIFICATION ....................7 4. INSTALLATION AND TEST ....................8 5. OPERATION ........................11 5-1. CONTROL PANEL FEATURES ................. 11 5-2. CYCLE GUIDE ......................13 5-3. SPECIAL FUNCTIONS ....................14 5-4.

  • Page 4: Specifications

    1. SPECIFICATIONS WM2050C* ITEM W:BLUE WHITE, G:PEARLY GRAY , R:CANDY APPLE RED COLOR POWER SUPPLY AC 120 V, 60 Hz PRODUCT WEIGHT 192 lbs (87kg) WASHING 280 W ELECTRIC POWER CONSUMTION DRAIN MOTOR 80 W WASH 46 rpm REVOLUTION SPEED SPIN 1100 rpm CYCLES...

  • Page 5: Features And Technical Explanation

    2. FEATURES & TECHNICAL EXPLANATION 2-1. FEATURES ■ Ultra Capacity The Larger drum enables not just higher head drop and stronger 淡Ъ肢艇? 情捷? centrifugal force, but also less tangling and wrinkling of the laundry. Heavier loads, such as king size comforters, blankets, and curtains, can be washed.

  • Page 6: Water Level Control

    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 washing rinsing time temperature FUZZY...

  • Page 7: Child Lock

    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. While the motor is in the process of intertial rotating, through the operation is paused. 2-6.

  • Page 8: Parts Identification

    3. PARTS IDENTIFICATION Door Seal Á ACCESSORIES Hot/Cold (1 each) Tie strap Wrench Hose for removing shipping bolts to secure drain hose to standpipe, and leveling the washer inlet hose, or laundry tub Cap (4 each) Hose retainer to cover the holes created after removing the shipping bolts...

  • Page 9: Installation And Test

    4. INSTALLATION & TEST Before servicing, ask the customer what the trouble is. Check the setup (power supply is 120V, remove the transit bolts, level the washer...) Check with the troubleshooting guide. Plan your service method by referring to the disassembly instructions. Service the unit.
  • Page 10 HOW TO CONNECT THE INLET HOSE Verify that the rubber washer is inside of the valve connector. Tighten the inlet hose securely to prevent leaks. CONNECT THE DRAIN HOSE Make sure that the hose is not twisted. Avoid submerging the end of the hose. The end of the drain hose should be placed less than 96”...

  • Page 11: Test Operation

    TEST OPERATION Press the POWER button. Press the Start/Pause Preparation for washing. button. • Connect the power plug to • Listen for a click to determine if the outlet. the door has locked. • Connect the inlet hose. Check the water Check the automatic Check the water supply.

  • Page 12: Operation

    5. OPERATION 5-1. CONTROL PANEL FEATURES WM2050C*...
  • Page 13 D D e e l l a a y y W W a a s s h h , , C C U U S S T T O O M M P P R R O O G G R R A A M M D D e e l l a a y y W W a a s s h h , , C C U U S S T T O O M M P P R R O O G G R R A A M M E E S S T T .

  • Page 14: Cycle Guide

    5-2. CYCLE GUIDE The cycle guide below shows the options and recommended fabric types for each cycle. Ta p/Cold Ta p/Cold Ta p/Cold Ta p/Cold Ta p/Cold Ta p/Cold DRAIN+ Drain, Spin Only SPIN NOTE: To protect your garments, not every wash/rinse temperature, spin speed, soil level, or option is available with every cycle.

  • Page 15: Special Functions

    5-3. SPECIAL FUNCTIONS The option buttons also activate special functions, including CHILD LOCK, LOAD SIZE, TUB CLEAN, and SPIN SENSE. 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 16: 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. • After loading laundry and selecting a course and a cycle, water is Water supplied and drum rotates.
  • Page 17 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 18: Wiring Diagram/Program Chart

    6. WIRING DIAGRAM/PROGRAM CHART...

  • Page 20: Test Mode

    7. TEST MODE 7-1. SAFETY CAUTION There's built-in AC 120V and DC power in output terminal of PWB assembly in common. 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. Be careful static when handling PWB assembly, and use Electro Static Discharge plastic pack when delivering or keeping it.

  • Page 21: Troubleshooting

    8. TROUBLESHOOTING 8-1. SAFETY CAUTION There’s built-in AC 120V and DC power in output terminal of PWB assembly in common. 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. Be careful static when handling PWB assembly, and use Electro Static Discharge plastic pack when delivering or keeping it.
  • Page 22 ERROR SYMPTOM CAUSE • The connector (3-pin, male, white) in the MOTOR HARNESS is not connected to the connector (3-pin, female, white) of STATOR ASSEMBLY. LOCKED • The electric contact between the connectors (3-pin, male, MOTOR white) in the MOTOR HARNESS and 4-pin, female, white ERROR connector in the MAIN PWB ASSEMBLY is bad or unstable.

  • Page 23: Troubleshooting Summary

    8-3. TROUBLESHOOTING SUMMARY...

  • Page 24: 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? while the power is on.) Check the AIR When you press both CHAMBER CUSTOM button and...

  • Page 25: Drain Error

    DRAIN ERROR Is the coil of the drain Replace the displayed? pump too high or low? DRAIN (resistance of the coil PUMP is 10-20Ω) ASSEMBLY. (Refer to 9-4 Pump motor Reconnect or Is the connector connected assembly) repair to pump motor assembly the connector.

  • Page 26: Locked Motor Error

    - part of motor LOCKED MOTOR ERROR displayed? Reconnect Check the connectors below. Motor the connector. Is the connector disconnected (connector / or disassembled? wire / motor) (motor hall sensor connector, Is rotor magnet cracked? Replace motor drive connector) the ROTOR - part of main PWB assembly (RD4, NA1) Magnet...

  • Page 27: Door Open Error

    DOOR OPEN ERROR Replace the Is there clicking sound once displayed? 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 disconnected? DOOR...

  • Page 28: Unbalance Error

    UNBALANCE ERROR OVER FLOW ERROR displayed? displayed? When you press both Check the AIR Put laundry Does the laundry lean CUSTOM button and CHAMBER evenly toward one side, not evenly PRE-WASH button and the tube In the DRUM put in the DRUM assembly? simultaneously, is the (clogged).

  • Page 29: Pressure Sensor Error

    PRESSURE SENSOR ERROR displayed? 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 30: 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 31: Button Doesn't Work

    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 ASSEMBLY the button.) Repair the Is the button of panel stuck? button...
  • Page 32 VIBRATION & NOISE IN SPIN Remove the transit bolts Have all the transit bolts and base packing and Base packing. been removed? Is the washer installed on a solidly constructed Move the washer or reinforce the floor. floor? Check if the washer is perfectly level as follows: Check the leveling of the washer with a level and check that the washer is stable.

  • Page 33: Detergent Does Not Flow In

    DETERGENT DOES NOT FLOW IN Refer to Is water supplied? NO WATER SUPPLY Are receptacles correctly connected to the Check the wiring. terminals of the INLET VALVE ASSEMBLY? Put the detergent in the correct place. Has detergent been put in the correct compartment of the dispenser? Is the detergent caked or hardened? Clean the dispenser.

  • Page 34: Abnormal Sound

    LIQUID DETERGENT/SOFTENER/BLEACH DOES NOT FLOW IN Refer to Is water supplied? NO WATER SUPPLY Check the wiring on the Are the plugs correctly connected to the terminals of dispenser. the INLET VALVE ASSEMBLY? Put it in the correct Is liquid detergent/softener/bleach put in the correct compartment.

  • Page 35: Component Testing Information

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

  • Page 36: Door Lock 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 PTC, a Bimetal, Function a Protection PTC, and a Solenoid. It locks the door during a wash cycle. 1.
  • Page 37 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 38: Stator Assembly

    9-3. STATOR ASSEMBLY Wiring Circuit in the MAIN PWB / Wiring Diagram diagram MAIN PWB NA1NA MICOM Function The DD 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 39 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 40 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 Vdc. If 10 Vdc is measured from 1 to 4, move lead on blue wire to red wire, terminal 2.

  • Page 41: 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 PUMP PUMP * Each circuits of loads in wiring diagram are all same.

  • Page 42: 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) 2 RD MAIN BLEACH VALVE WASH 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 43: Thermistor Assembly

    9-6. THERMISTOR ASSEMBLY Wiring Circuit in the MAIN PWB / Wiring Diagram diagram MAIN PWB MICOM WASH THERMISTOR The thermistor (temperature sensor) is used to monitor water temperature in the tub Function or Steam Generator. Test Test Result Remarks points Points (tolerance ±5%) &...

  • Page 44: Disassembly Instructions

    10. DISASSEMBLY INSTRUCTIONS Be sure to unplug the machine before disassembling and repairing the parts. CONTROL PANEL ASSEMBLY Unscrew 2 screws on the back of the top plate. Pull the top plate backward and upward as shown. Disconnect the Display PWB assembly connector from trans cable.
  • Page 45 MAIN PWB ASSEMBLY Disconnect the POWER connector and SENSOR SWITCH ASSEMBLY. Remove the Protective cover. Disconnect the connectors. Unscrew 1 screw on the back. Remove the Main PWB.

  • Page 46: Dispenser Assembly

    DISPENSER ASSEMBLY Disassemble the top plate assembly. Pull out the drawer. Push out the DISPENSER ASSEMBLY after unscrewing 2 screws. Unscrew the Clamp nut at the lower part of the dispenser. Disassemble the 4 connectors from the valves. Wire Color Blue Housing (YL-BK) White Housing (WH-BK) Blue Housing (GY-BK)
  • Page 47 CABINET COVER Unscrew the 5 screws from upper of the canbinet cover. Unscrew the screw from filter cover. Put a flat ( -) screwdriver or putty knife into the hinge slots at the bottom of the cover and pry it out. Unscrew the screw from the lower side of the cabinet cover.
  • Page 48 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 49 MOTOR/DAMPER Disassemble the back cover. Remove the bolt. Pull out the Rotor. 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 and base.

  • Page 50: Exploded View

    11. EXPLODED VIEW 11- 1. CABINET & CONTROL PANEL ASSEMBLY “The following parts are not illustrated" Description Loc No. *Owner’s Manual G001 *Energy Label G002 *Service Manual G004 Printed materials *Wiring Diagram G005 *Quick Start Guides G006 F215 G007 *Installation Sheet A485 F210 F110...

  • Page 51: Drum And Tub Assembly

    11-2. DRUM & TUB ASSEMBLY K143 K123 K350 K360 K351 F140 K610 K411 K410 K611 K115 F466 K110 K141 K111 K140 K117 F315 K572 F310 K571 F465 F463 K570 K122 F464 K125 K130 K530 K121 K510 K135 K131 K342 F467 K340 K520 F468...

  • Page 52: Dispenser Assembly

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

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