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LG WM3988HWM Service Manual

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WASHING MACHINE
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
MODEL : WM3988H*A
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  Summary of Contents for LG WM3988HWM

  • Page 1 Website: http://biz.lgservice.com WASHING MACHINE SERVICE MANUAL CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT. MODEL : WM3988H*A Downloaded from www.Manualslib.com manuals search engine...
  • Page 2 AUG. 2007 PRINTED IN KOREA P/No.: MFL30599110 Downloaded from www.Manualslib.com manuals search engine...
  • 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 ....................15 6.
  • Page 4: Specifications

    1. SPECIFICATIONS ITEM WM3988H*A COLOR W:BLUE WHITE, N:NAVY BLUE POWER SUPPLY AC 120 V, 60 Hz PRODUCT WEIGHT 192 lbs (87kg) WASHING 280 W ELECTRIC POWER DRAIN MOTOR 80 W CONSUMTION WASH HEATER 1000 W WASH 46 rpm REVOLUTION SPEED SPIN 1320 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 추가선택, 예약, also less tangling and wrinkling of the laundry. Heavier loads, such as king size comforters, blankets, and curtains, can be washed.
  • Page 6 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 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 & Steam Nozzle Drum Light Door Seal ■ ACCESSORIES Included Accessories Caps (4) (for covering Hot and Cold shipping bolt holes) Water Hoses Wrench Tie Strap (for removing Elbow Bracket (for securing shipping bolts and (for securing drain hose) adjusting leveling feet) drain hose)
  • Page 9: Installation And Test

    4. INSTALLATION & TEST Before servicing, ask the customer what the trouble is. Check the setup (power supply is 120V AC, 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. ·...
  • Page 11 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 WM3988HWM Downloaded from www.Manualslib.com manuals search engine...
  • Page 13 Power Button Status Indicator • It shows elapsed time of the cycle the washer is • Use this button to turn the power operating. On/Off. Start/Pause Cycle Selector Knob • Use this button to Start/ • Rotate the Cycle selector knob to select the cycle designed for Stop the washer.
  • Page 14 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. Wash/Rinse Pre- Rinse + Extra Stain Water Cycle Fabric type Spin Speed Soil Level Steam Temp. Wash Spin Rinse Cycle Plus Steam Dress shirts, blouses Fresh Extra Hot/Cold High...
  • Page 16: Special Functions

    5-3. SPECIAL FUNCTIONS The option buttons also activate special functions, including CHILD LOCK, DRUM LIGHT, TUB CLEAN, and LANGYAGE. 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 17 LANGUAGE This option allows you to change the language shown in the display. Once set, the selected language will stay set even after the power is turned off. The display language options are English, French, and Spanish; English is the default language. To change the language: Press the ON/OFF button to turn on the washer.
  • Page 18: Wiring Diagram/Program Chart

    6. WIRING DIAGRAM/PROGRAM CHART Downloaded from www.Manualslib.com manuals search engine...
  • Page 19 Downloaded from www.Manualslib.com manuals search engine...
  • Page 20: 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 21: How To Read The Display In Load Test Mode

    7-3. HOW TO READ THE DISPLAY IN LOAD TEST MODE Water level Steam temperature frequency Fan Motor RPM Wash temperature Duct temperature 7-4. HOW TO CHECK THE WATER LEVEL FREQUENCY * Press the WASH/RINSE and SOIL LEVEL button simultaneously. The digits indicate the water level frequency. For example, if the display indicate 058, the water level frequency is 20+(58 X 0.1) = 25,8 kHz.
  • 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 LOCKED MOTOR HARNESS is not connected to the connector (3-pin, ERROR 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 24: Troubleshooting Summary

    8-3. TROUBLESHOOTING SUMMARY Downloaded from www.Manualslib.com manuals search engine...
  • 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.) When you press both Check the AIR WASH/RINSE button and CHAMBER...
  • Page 26 DRAIN ERROR displayed? Is the coil of the drain Replace the Reconnect or Is the connector connected pump too high or low? DRAIN repair to pump motor assembly (resistance of the coil PUMP the connector. disconnected or is 10-20Ω) ASSEMBLY. disassembled? (Refer to 9-4 Pump motor assembly)
  • 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 repair to heater disconnected or the connector disassembled? Steam generator thermistor Dry thermistor Steam generator heater Wash thermistor Dry thermistor Replace the Is thermistor resistance...
  • Page 28 - 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 - part of main PWB assembly (NA1, RD4) Magnet...
  • Page 29 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 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 SOIL LEVEL button and the tube In the DRUM put in the DRUM assembly? simultaneously, is the (clogged).
  • Page 31 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 DRY HEATING ERROR Replace the Is the resistance values in the range of 2 to 5 Ω? FAN Motor Assembly (pin1-pin3, pin2-pin3) displayed? - After pull out the YL1 connector, check the terminal of the connector in wire.(Yellow 3P, male) Reconnect or Is the connector connected repair the...
  • Page 33 Replace the Is Check heater resistance Remove the After you separated Heater out of range while the power foreign condensing bellows from assembly is off? material cabinet, can you find any (10~40 Ω) foreign material in (Refer to 9-6 Heater condensing duct and assembly) condensing bellows?
  • Page 34: 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 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 ASSEMBLY the button.) Repair the Is the button of panel stuck? button...
  • Page 36 VIBRATION & NOISE IN SPIN Have all the transit bolts and base packing Remove the transit bolts been removed? and Base packing. Move the washer or Is the washer installed on a solidly constructed 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 37 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 38 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 39: 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 40: 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, a Function Protection PTC, and a Solenoid.
  • Page 41 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 Downloaded from www.Manualslib.com manuals search engine...
  • Page 42: 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 43 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 44 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 45: 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 46: 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 GYOR BL (BK) MAIN BLEACH VALVE 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 47: Heater Assembly

    9-6. HEATER ASSEMBLY Wiring Circuit in the MAIN PWB Wiring diagram diagram MAIN PWB MICOM Heater Tab Relay STEAM WASH Heater driving circuit HEATER GENERATOR HEATER HEATER * Each circuits of loads in wiring diagram are all same. 1. The Wash Heater is designed to raise the wash water to the desired temperature Function selection during certain wash cycles.
  • Page 48: Thermistor Assembly

    9-7. 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 Function tub, Steam Generator, Dry duct and Condensing duct. Test points (1) (2) Wash Thermistor...
  • Page 49: Steam Generator Assembly

    Result Wash Thermistor / Dry Thermistor Test Points Result Remarks (tolerance ±5%) (1) to (2) 39.5 kΩ At 86°F (30°C) 26.1 kΩ At 104°F (40°C) (2) to (3) At 140°F (60°C) 12.1 kΩ At 158°F (70°C) 8.5 kΩ At 203°F (95°C) 3.8 kΩ...
  • Page 50 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 SENSOR Heater & Thermistor : Refer to the 9-6 / 9-7 Original THERMISTOR HEATER...
  • Page 51 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 52: Lamp

    9-9. LAMP Wiring Circuit in the MAIN PWB / Wiring Diagram diagram 16.5V MAIN PWB MICOM 1 2 3 1 2 3 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. It remains off when the door is locked.
  • Page 53: Disassembly Instructions

    10. DISASSEMBLY INSTRUCTIONS CONTROL PANEL ASSEMBLY Downloaded from www.Manualslib.com manuals search engine...
  • Page 54 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. Downloaded from www.Manualslib.com manuals search engine...
  • Page 55 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) Red Housing (VT-BK) White Housing (WH-BK)
  • Page 56 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 57 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. Downloaded from www.Manualslib.com manuals search engine...
  • Page 58 DOOR ① ① Open the door. ② ② Unscrew the 7 screws from the HINGE COVER. ③ ③ Put a flat ( - ) screwdriver into the openng of the hinge, and pull out the hinge cover. ④ ④ Unscrew a screw from the lower side of door. ⑤...
  • Page 59 PUMP ① ① Disassemble the cabinet cover. ② ② Separate the pump hose, the bellows and the circulation hose assembly from the pump assembly. ③ ③ Disassemble the pump assembly in arrow direction. HEATER ① ① Disassemble the cabinet cover. ②...
  • Page 60 WHEN FOREIGN OBJECT IS STUCK BETWEEN DRUM AND TUB ① ① Disassemble the cabinet cover. ② ② Separate the heater from the tub. ③ ③ Remove any foreign objects (wire, coin, etc.) by inserting a long bar in the opening. LAMP ASSEMBLY TOP PLATE ASSEMBLY ①...
  • Page 61 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 62 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...
  • Page 63 Taking out the screws of Body Frame (2 ea) Separate the hoses from the TSG. Remove the body frame and then, separate the TSG from the washer Downloaded from www.Manualslib.com manuals search engine...
  • Page 64: Exploded View

    11. EXPLODED VIEW 11-1. CABINET & CONTROL PANEL ASSEMBLY M400 M410 F215 A485 F210 F110 A455 A450 A104 A105 A106 A102 A111 A110 A410 A103 A150 A154 A152 A101 A141 A390 A151 A153 A100 A131 A130 A430 A140 A133 A440 A155 A300 A310...
  • Page 65: Drum And Tub Assembly

    11-2. DRUM & TUB ASSEMBLY K351 K350 K360 K143 K123 F140 K610 K411 K611 K410 K115 F466 K141 K110 K141 K111 K117 K140 F315 F310 F465 K572 K571 F463 K513 K122 F464 K570 K125 K511 K130 K320 K530 K121 K510 K512 K560 K135...
  • Page 66: Dispenser Assembly

    11-3. DISPENSER ASSEMBLY F323 F322 F462 F321 F300 F170 F160 F227 F226 F327 F225 F430 F220 F441 F120 A275 F130 A276 F432 Downloaded from www.Manualslib.com manuals search engine...
  • Page 67: Dryer

    11-4. DRYER M111 M110 M120 M100 M121 M210 M230 M215 K311 M240 M130 M101 M220 M312 M310 M311 M260 M235 Downloaded from www.Manualslib.com manuals search engine...

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Wm3988h*a series