LG WM2701H Series Service Manual

LG WM2701H Series Service Manual

Lg wm2701h series washing machine
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WASHING MACHINE

SERVICE MANUAL

CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
MODEL : WM2701H*
Website:http://biz.lgservice.com

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Table of Contents
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Summary of Contents for LG WM2701H Series

  • Page 1: Washing Machine

    Website:http://biz.lgservice.com WASHING MACHINE SERVICE MANUAL CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT. MODEL : WM2701H*...
  • Page 2 JAN. 2009 PRINTED IN KOREA P/No.: MFL30599132...
  • Page 3: Table Of Contents

    CONTENTS 1. SPECIFICATIONS ....................... 3 2. FEATURES & 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 ......................14 5-3. SPECIAL FUNCTIONS ....................16 5-4.
  • Page 4: Specifications

    1. SPECIFICATIONS ITEM WM2701H* COLOR W:BLUE WHITE, V:Stainless VCM POWER SUPPLY AC 120 V, 60 Hz PRODUCT WEIGHT 192 lbs (87kg) WASHING 280 W ELECTRIC POWER DRAIN MOTOR 80 W CONSUMPTION WASH HEATER 1000 W WASH REVOLUTION 46 rpm SPEED SPIN 0-1200 rpm CYCLES...
  • Page 5: Features & 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 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. White the motor is in the process of intertial rotating, through the operation is paused. 2-6.
  • Page 8: Parts Identification

    3. PARTS IDENTIFICATION ACCESSORIES Tie strap (Option) Hot/Cold (1 each) Wrench to secure drain hose to standpipe, Hose inlet hose, or laundry tub Caps(4) Elbow Bracket Non-skid pads (for securing drain hose) (for covering shipping bolt holes)
  • 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 heating Check the automatic Check the water supply.
  • Page 12: Operation

    5. OPERATION 5-1. CONTROL PANEL FEATURES WM2701H*...
  • Page 13: Status Indicator

    Power Button Status Indicator • Use this button to turn the power • It shows elapsed time of the cycle the washer On/Off. is operating. Cycle Selector Knob Start/Pause • Rotate the Cycle selector knob to select the cycle designed for •...
  • Page 14: Option Button

    Option Button • PREWASH: Use this option for loads that need pretreatment. It adds 16 minutes prewash and a spin cycle. • RINSE+SPIN: Use this option to rinse and then spin. • EXTRA RINSE: This option provides an additional rinse. •...
  • Page 15: Cycle Guide

    5-2. CYCLE GUIDE The cycle guide below shows the options and recommended fabric types for each cycle. Stain Wash/Rinse Pre- Rinse + Extra WASH/Rinse Water Cycle Fabric type Spin Speed Soil Level Cycle Temp. Wash Spin Rinse Optimizer Plus Extra Hot/Cold High Normal Heavily soiled...
  • Page 16 Stain Wash/Rinse Pre- Rinse + Extra WASH/Rinse Water Cycle Fabric type Spin Speed Soil Level Cycle Temp. Wash Spin Rinse Optimizer Plus Cold/Cold Medium Normal Dress shirts/blouses Warm/Cold No Spin Heavy Delicates nylons, sheer or lacy Warm/Warm Light garments Cold/Cold Normal Hand Items labeled...
  • Page 17: Special Functions

    5-3. SPECIAL FUNCTIONS The option buttons also activate special functions, including CHILD LOCK, DRUM LIGHT, TUB CLEAN. 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: Program Chart

    6. PROGRAM CHART...
  • Page 21: Test Mode

    7. TEST MODE 7-1. SAFETY CAUTION There's built-in AC 110V 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: 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 23 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. • The electric contact between the connectors LOCKED (3-pin, male, white) in the MOTOR HARNESS MOTOR and 4-pin, female, white connector in the MAIN PWB ASSEMBLY is bad or unstable.
  • Page 24: Troubleshooting Summary

    8-3. TROUBLESHOOTING SUMMARY...
  • Page 25: 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 WASH/RINSE button and...
  • Page 26: Drain Error

    DRAIN ERROR Is the coil of the drain Replace the pump too high or low? DRAIN PUMP (resistance of the coil ASSEMBLY. is 10-20Ω) displayed? (Refer to 9-4 Pump motor assembly.) Reconnect or Is the connector connected Replace the Is the voltage between repair to pump motor assembly MAIN PWB...
  • Page 27 HEATING ERROR Reconnect or Is the connector connected to repair thermistor disconnected or the connector. disassembled? displayed? 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 out of range?
  • Page 28: 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, Replace Is rotor magnet cracked? motor drive connector.) the ROTOR.
  • Page 29: 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 30: Unbalance Error

    UNBALANCE ERROR OVER FLOW ERROR displayed? displayed? When you press both Check the AIR Put laundry Does the laundry lean WASH/RINSE button and CHAMBER evenly toward one side, not evenly DELAY WASH button and the tube In the DRUM put in the DRUM assembly? simultaneously, is the (clogged).
  • Page 31: 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 32: Troubleshooting Else

    8-5. TROUBLE SHOOTING 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 33: 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 34 VIBRATION & NOISE IN SPIN Put an unbalance part (rubber) inside of drum and start QC test mode and run in high spin. Have all the transit bolts Remove the (Refer to section 7-2.) transit bolts and base packing been When the machine is and Base removed?
  • Page 35 VIBRATION SENSOR CHECK When you check the sensor Check the Is each terminal open? Replace the leveling of (Check the all terminal of vibration error during LQC mode. washer, the vibration sensor’s sensor Is it displayed “bs2”? transit bolts connector. (Refer to 7-2) and base packing...
  • Page 36: 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 37: 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 38: 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 39: 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 Heating PTC, a Bimetal, a Function Protection PTC, and a Solenoid.
  • Page 40 Test points Result Test Points Result Remarks (2) to (4) 700-1500 Ω At 77 °F °C (3) to (4) 60-90 Ω At 77 °F °C (4) to (5) Infinity (2) to (4) 120 Vac Voltage Input...
  • Page 41: 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.
  • Page 42 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 43 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 44: 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 45: 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 WASH VALVE WASH VALVE 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 Function cold water valve solenoids to meet the selected water temperature.
  • Page 46: 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 47: 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 48 Result Wash Thermistor Test Points Result Remarks (tolerance ±5%) (1) to (2) At 86°F (30°C) 39.5 kΩ 26.1 kΩ At 104°F (40°C) At 140°F (60°C) 12.1 kΩ At 158°F (70°C) 8.5 kΩ 3.8 kΩ At 203°F (95°C) At 221°F (105°C) 2.8 kΩ...
  • Page 49 2) Operation mechanism of Steam generator Function After supplying some amount of water through inlet valve and water level sensor, Heater operates and steam generates. Generated steam is sprayed by nozzle. If the water in the steam generator is reduced by spraying steam, water level sensor decide to supply water or not.
  • Page 50: Vibration Sensor Assembly

    9-8. 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 tub cover of washing machine. It estimates the vibration of washing machine’s tub during drying.
  • Page 51: 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 52 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 53: Noise Filter

    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 (BK-WH) Blue Housing (BK-GY)
  • Page 54 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 55 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 56 Open the door. Unscrew the 7 screws from the HINGE COVER. Put a flat ( - ) screwdriver into the openng of the hinge, and pull out the hinge cover. Unscrew a screw from the lower side of door. Disassemble the door upward. Be careful! The door is heavy.
  • Page 57 PUMP Disassemble the cabinet cover. CIRCULATION Separate the pump hose, the bellows and the HOSE circulation hose assembly from the pump PUMP HOSE assembly. BELLOWS Disassemble the pump assembly in arrow direction. HEATER Disassemble the cabinet cover. Separate 2 connectors from the heater. Loosen the nut and pull out the heater.
  • Page 58 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.
  • Page 59 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 60: 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 *Tech Sheet G003 Printed materials *Service Manual G004 *Quick Start Guides G006 M410 *Installation Sheet G007 *Non-Skid Pasd G010 F215...
  • Page 61: 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 F464 K122 K570 K125 K195 K130 K320 K530 K121 K510 K315...
  • Page 62: Dispenser Assembly

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

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