LG WM3987H Series Service Manual
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LG WM3987H Series Service Manual

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WASHING MACHINE

SERVICE MANUAL

CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
MODEL : WM3987H*
Website:http://biz.lgservice.com

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Summary of Contents for LG WM3987H 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 : WM3987H*...
  • Page 2 NOV. 2009 PRINTED IN KOREA P/No.: MFL30138960...

  • Page 3: Table Of Contents

    CONTENTS 1. SPECIFICATIONS .........................3 2. FEATURES & TECHNICAL EXPLANATION ................4 3. PARTS IDENTIFICATION ......................7 4. INSTALLATION & TEST ....................... 8 5. WIRING DIAGRAM ........................11 6. OPERATION ..........................12 7. TROUBLESHOOTING.........................14 7-1. BEFORE PERFORMING SERVICE ...................14 7-2. QC TEST MODE.........................14 7-3.

  • Page 4: Specifications

    1. SPECIFICATIONS ITEM WM3987H* COLOR BLUE WHITE POWER SUPPLY AC 120 V, 60 Hz PRODUCT WEIGHT 201 lbs (91kg) WASHING 280 W ELECTRIC DRAIN MOTOR 80 W POWER CONSUMTION 1000 W WASH HEATER 46 rpm WASH REVOLUTION SPEED SPIN 0 - 1200 rpm CYCLES WASH/RINSE TEMPERATURES SPIN SPEEDS...

  • Page 5: Features & Technical Explanation

    2. FEATURES & TECHNICAL EXPLANATION 2-1. FEATURES Direct Drive System The advanced Brushless DC motor directly drives the drum without belt and pulley. Tilted Drum and Extra Large Door Opening The tilted drum and extra large door opening make it possible to load and unload easily.

  • 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 & 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..). 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 100 cm from the floor.

  • 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: Wiring Diagram

    5. WIRING DIAGRAM...

  • Page 13: Operation

    6. OPERATION Power Button Status Indicator • Use this button to turn the power • It shows elapsed time of the cycle the washer On/Off. is operating. C C O O T T T T O O N N / / N N O O R R M M A A L L B B U U L L K K Y Y / / L L A A R R G G E E P P R R E E M M .

  • Page 14: Option Button

    Option Button • PREWASH : Use this option for loads that need pretreatment. It adds 16 minutes prewash and a spin cycle. • EXTRA RINSE: This option provides an additional rinse. • STAIN CYCLE: Adds time to the wash and rinse cycles for better stain removal. Automatically provides a rinse.

  • Page 15: Troubleshooting

    7. TROUBLESHOOTING 7-1. BEFORE PERFORMING SERVICE Be careful of electric shock when disconnecting parts while troubleshooting. The voltage of each terminal is 120 V AC and DC when the unit is plugged in. 7-2. QC TEST MODE. The washer must be empty and the controls must be in the off state. 1.

  • Page 16: Error Display

    7-4. ERROR DISPLAY If you press the START/PAUSE button when an error is displayed, any error except will disappear and the machine will go into the pause status. In case of if the error is not resolved within 20 sec., or the in case of other errors, if the error is not resolved within 4 min., power will be turned off automatically and the error code will blink.
  • Page 17 ERROR SYMPTOM CAUSE OVER • MAIN PWB ASSEMBLY is out of order. CURRENT • Winding in the STATOR ASSEMBLY is short-circuited. ERROR • The connector (3-pin, male, white) in the MOTOR HARNESS is not connected to the connector (3-pin, female, white) of STATOR ASSEMBLY. •...

  • Page 18: Error Diagnosis And Check List

    8. ERROR DIAGNOSIS AND CHECK LIST 8-1. DIAGNOSIS AND SOLUTION FOR ABNORMAL OPERATION SYMPTOM GUIDE FOR SERVICE CALL No power Is the power plug connected firmly to 120V AC outlet? Power failure? or Breaker opened? Is the outlet controlled by a switch? Visit to service.
  • Page 19 SYMPTOM GUIDE FOR SERVICE CALL Door error Was the load too large? Visit to service. Drain trouble Visit to service.
  • Page 20 SYMPTOM GUIDE FOR SERVICE CALL Suds overflow from the Is a low-sudsing detergent used? appliance. (In this condition, wash and spin do not operate normally) LOW-SUDSING Is the proper amount of detergent used as recommended? Recommend to reduce the amount of detergent.

  • Page 21: Fault Diagnosis And Troubleshooting

    8-2. FAULT DIAGNOSIS AND TROUBLESHOOTING 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 Check the fuse or reset Is the supplied voltage 120V AC?
  • Page 22 VIBRATION & NOISE IN SPIN Have all the transit bolts and base packing Remove the transit bolts been removed? and Base packing. Is the washer installed on a solidly constructed Move the washer or floor? reinforce the 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 23 If it still has severe vibration and noise, regulate a specific spin speed that generates excessive vibration and noise as follows: 1) Put an unbalance part (rubber) inside of the drum. 2) Start the QC test mode (Refer to section 7-2). 3) Press Delay Wash button, then ‘...

  • Page 24: No Water Supply

    NO WATER SUPPLY Is water supply shut-off? Is the tap opened? Open the tap. When you press both SPIN button and RINSE Check the AIR CHAMBER button simultaneously, is the water level frequency and the tube (clogged). below 246? Is the inlet valve filter clogged? Clean the filter.

  • Page 25: Abnormal Sound

    LIQUID DETERGENT/SOFTENER 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 26: Heating Without Water

    HEATING WITHOUT WATER When pressing WASH/RINSE and SOIL LEVEL at the same time after draining, is the water level Replace the frequency 255? SENSOR SWITCH When pressing WASH/RINSE and SOIL LEVEL ASSEMBLY. buttons at the same time while washing, is the water level frequency between 230 - 243 ? Check the voltage between two pins while pressing Replace the MAIN PWB...
  • Page 27 WASH HEATER TROUBLE When checking the voltage between connector during whites washing. Is the voltage 120 V AC? HEATING CONTINUOUSLY ABOVE THE SETTING WATER TEMPERATURE Push the THERMISTOR When checking the THERMISTOR on the tub, tightly to the rubber. is the THERMISTOR loose?

  • Page 28: Will Not Circulate Water

    WILL NOT CIRCULATE WATER Is the impeller of the drain pump clogged? Remove foreign material. Remove foreign material. Are the Hose Connector and/or Hose clogged? Reconnect or repair Is the connector disconnected, disassembled? the connector. Is the coil of the right side of drain pump open Replace PUMP MOTOR or short circuited? (Coil R is 18-30 Ω) ASSEMBLY.

  • Page 29: Spin Trouble

    SPIN TROUBLE Check the SENSOR SWITCH Check during spin if the frequency of the water ASSEMBLY or HOSE (Pressure). level is 248 or more. If the problem is on the SENSOR SWITCH ASSEMBLY or the HOSE, replace the SENSOR SWITCH ASSEMBLY or the HOSE.
  • Page 30 Replace the thermistor. Is the resistance of thermistors on dry duct 6322FR2046C : Dry 2.5kΩ - 180kΩ (at 100 Duct Disassemble the cabinet cover and condensing bellows. Clean the bellows Is there any foreign object in the condensing bellows. Disassemble the dry fan assembly and dry duct upper, and remove foreign objects in duct and fan.

  • Page 32: Disassembly Instructions

    9. DISASSEMBLY INSTRUCTIONS Be sure to unplug the machine out of the outlet before disassembling and repairing the parts. Unscrew 2 screws on the back of the top plate. Unscrew 2 screws on the back of the top plate. Pull the top plate backward and upward as shown. Pull the top plate backward and upward as shown.
  • Page 33 Disconnect the POWER connector and SENSOR SWITCH ASSEMBLY. Remove the Protect Cover. Disconnect the connectors. Unscrew 1 screw on the back. Disassemble the Main PWB.
  • Page 34 Disassemble the top plate assembly. Pull out the drawer. Push out the DISPENSER ASSEMBLY after unscrew 2 screws. Unscrew the 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) Blue Housing(GY-BK)
  • Page 35 Unscrew the a screw from the Top Bracket. Disassembly one connector from the Main PWB. Unscrew the 4 screws from upper of the canbinet cover. Unscrew the screw from filter cover. Put a flat ( - ) screwdriver or putty knife into the both sides of the filter cover, and pull it out.
  • Page 36 Open the door. Disassemble the clamp assembly. Tilt the cabinet cover. Disconnect the door switch connector. NOTE: When assembling the CABINET COVER, connect the connector. Lift and separate the cabinet cover. Disassemble the clamp assembly. Disassemble the Gasket.
  • Page 37 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 38 Disassemble the cabinet cover. Separate the pump hose, the bellows and the circulation hose assembly from the pump assembly. Disassemble the pump assembly in arrow direction. Disassemble the cabinet cover. Separate 2 connectors from the heater. Loosen the nut and pull out the heater. CAUTION •...
  • Page 39 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. Unscrew the 4 screws from the back cover. Unscrew the single screw from the lower-right side of the cabinet.
  • Page 40 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 41: Exploded View

    10. EXPLODED VIEW 10-1. 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 *Non-Skid Pads G010 A485...

  • Page 42: Drum & Tub Assembly

    10- 2 . DRU M & TUB ASSE MBLY K351 K350 K360 K143 K123 K610 F140 K411 K410 K611 K115 F466 K110 K141 K111 K140 K117 F315 F310 K572 K571 F465 K142 F463 K513 K122 K570 F464 K125 K511 K130 K320 K530 K121...

  • Page 43: Dispenser Assembly

    10-3. DISPENSER ASSEMBLY F323 F322 F462 F321 F300 F170 F160 F227 F226 F225 F430 F220 F441 F120 HOT (RED) A275 F130 COLD (BLUE) A276 F432...

  • Page 44: Dryer

    10-4. DRYER M111 M110 M120 M100 M121 M210 M230 M215 K311 M240 M130 M101 M220 M312 M310 M311 M260 M235...

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