LG WM1377HW Service Manual
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LG WM1377HW Service Manual

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WASHING MACHINE
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE TROUBLES
CORRECTLY BEFORE OFFERING SERVICE.
MODEL : WM1377HW

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Summary of Contents for LG WM1377HW

  • Page 1 WASHING MACHINE SERVICE MANUAL CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE TROUBLES CORRECTLY BEFORE OFFERING SERVICE. MODEL : WM1377HW...
  • Page 2 P/No.: MFL62645352...

  • Page 3: Table Of Contents

    CONTENTS 1. SPECIFICATION..........................3 2. FEATURES & TECHNICAL EXPLANATION ................4 3. PARTS IDENTIFICATION ......................6 4. INSTALLATION ..........................7 5. OPERATION ..........................10 6. WIRING DIAGRAM / PCB LAYOUT / PROGRAM CHART ............12 7. TROUBLE SHOOTING........................14 7-1.BEFORE SVC CHECKING ....................14 7-2.QC TEST MODE........................14 7-3.HOW TO KNOW THE WATER LEVEL FREQUENCY............14 7-4.HOW TO KNOW TO TEMPERATURE OF EACH THERMISTOR AT OPERATING CONDITION..14 7-5.ERROR DISPLAY ........................15...

  • Page 4: Specification

    1. SPECIFICATION WM1377HW ITEM POWER SUPPLY 120 V~, 60 Hz PRODUCT WEIGHT 67 kg WASHING 134 W ELECTRICITY SPIN 455 W CONSUMPTION DRAIN MOTOR 80 W WASH HEATER 1000 W WASH 50 rpm REVOLUTION SPEED No Spin/400/600/800/1000/1200/1400 SPIN 1.0 - 9.8 kgf/cm2 (100 - 980 kPa)

  • 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. Water Circulation Spray detergent solution and water over the load over continu. Clothes are soaked more quickly and thoroughly during wash cycle. The detergent suds can be removed more easily by the water shower during rinse cycle.
  • Page 6 2-2.DETERMINE WASHING TIME BY FUZZY LOGIC To get the best washing performance optimal time is determined by sensing of water temperature, selected washing temperature and laundry amount. water temperature washing time the best selected FUZZY washing washing rinsing time temperature LOGIC performance spin rhythm, time...

  • Page 7: Parts Identification

    3. PARTS IDENTIFICATION Power plug Transit bolts • If the supply cord is damaged, Drawer it must be replaced by the manufacturer or its service agents (For detergent and or a similarly qualified person in fabric softener) order to avoid a hazard. Control panel Drain hose Drum...

  • Page 8: Installation

    4. INSTALLATION Before servicing ask the customer what the trouble is. Check the adjustment(power supply is 120 V, remove the transit bolts..) Check the troubles referring to the trouble shooting. Decide service steps referring to disassembly instructions. And then, service and repair. After servicing, operate the appliance to see whether it works O ·...
  • Page 9 ■ HOW TO CONNECT INLET HOSE Check that the rubber packing is inside of the valve connector. Connect the inlet hose firmly to prevent leak. ■ CONNECT DRAIN HOSE · Make sure that the hose is not twisted. · Avoid submerging the end of the hose. ※...
  • Page 10 TEST OPERATION Preparation Press the POWER button. Press the Start/Pause o t t washing. Connect the power plug to the outlet. In case of Coloreds program. Connect the inlet hose. Check the water heating. Check automatic reverse Check the water supply. turn.

  • Page 11: Operation

    5. OPERATION Cycle Selector Power • Rotate the Cycle selector • • Use this button to turn the knob to select the cycle power On/Off. designed for different types of fabric and soil levels. Additional Programs Start/Pause • • Use this button to Start/ •...
  • Page 12 Spin Selector knob LED display • • To change the spin speed. turn the • Display the estimated remaining time spin knob to cycle through available (Hour : minute) to finish. options. • In case of abnormal operation. error indications are displayed (IE, OE, UE, dE, tE, FE, PE, LE, PF) •...

  • Page 13: Wiring Diagram / Pcb Layout / Program Chart

    PCB Layout (Main) Heater Display Power PCB POWER Motor Stator Control /U~W /W~V ⇒R:8~11Ω Hall Sensor Control (5~15kohm) Thermistor (5~15kohm) Common Pressure Switch & Measure Hz impossible LED Display Here. Just Check cut-off Circulation Pump Common Circulation Pump (152~170Ω) Pressure Door S/W &...
  • Page 14 6. WIRING DIAGRAM PROGRAM CHART Wash Rinse Spin Extra & Main Stain(4~6) Wash **Approx Working Time (Minute) 120 480 60 180 120 180 120 180 60 180 120 180 60 180 120 180 60 180 120 180 60 480 120 30 (‘’-) (‘’-) Cotton...

  • Page 15: Trouble Shooting

    7. TROUBLE SHOOTING 7-1.BEFORE SVC CHECKING ■ Be careful of electric shock or disconnecting the parts while trouble shooting. ■ Voltage of each terminal in 113-127 V~ and DC while applying an electric current. 7-2.QC TEST MODE. ① Pressing Option (Left) and Soil Level button simultaneously. ②...

  • Page 16: 7-5.Error Display

    7-5.ERROR DISPLAY. If you press the Start/Pause button in error condition, any error except ‘ ’ will disappear and the machine will change into pause status. In case of d e , if the error is not resolved within 20 sec., and in case of other errors, e , d if the error is not resolved within 4 min., power will be turned off automatically and the error only will be blinked.
  • Page 17 LOCKED • The connector in the LEAD WIRE ASSEMBLY is not connected to MOTOR the connnector of STATOR ASSEMBLY ERROR Reconnect or repair the connector • The hall sensor is out of order/defective. Replace the STATOR ASSEMBLY • Water leaks POWER •...

  • Page 18: Error Diagnosis And Check List

    8. ERROR DIAGNOSIS AND CHECK LIST 8-1.DIAGNOSIS AND ANSWER FOR ABNORMAL OPERATION Symptom Guide for Service Call NO POWER Is the power plug connected firmly to 120V~ outlet? Power failure? or Breaker opened? Visit to check WATER INLET TROUBLE Is " "...
  • Page 19 SYMPTOM GUIDE FOR SERVICE CALL • DOOR DOES NOT Started with door opened? OPEN • ERROR DISPLAYED Close the door ON THE PROGRAM Visit to check Check if the door switch is O K. • DRAIN TROUBLE Is " " displayed? Is the debris filter clogged with foreign Clean up material such as pin, coin and etc.?
  • Page 20 SYMPTOM GUIDE FOR SERVICE CALL ∙ Suds overflow from the Is low-sudsing detergent for the drum appliance. washing machine used? (In this condition, wash and spin do not operate LOW-SUDSING normally) Is the proper amount of detergent used as recommended? Recommend to reduce the using amount of detergent.

  • Page 21: Fault Diagnosis And Trouble Shooting

    8-2.FAULT DIAGNOSIS AND TROUBLE SHOOTING CAUTION 1. Be careful of electric shock or disconnecting the parts while trouble shooting. 2. First of all, check the connection of each part terminal with wiring diagram. 3. If you replace the PWB ASSEMBLY, Put in the connectors correctly. NO POWER When measuring the voltage of the outlet, Check the fuse?
  • Page 22 NO WATER SUPPLY Is water supply shut-off? Is the tap opened? Open the tap. Check the AIR CHAMBER When you press both Water plus button and and the tube clogged Option(Left) button simultaneously, is the water level frequency below 255? with impurity.
  • Page 23 SOFTENER DOES NOT FLOW IN Refer to Is water supplied? NO WATER SUPPLY Check the wiring on the Are receptacles correctly connected to the terminals dispenser. of the INLET VALVE ASSEMBLY? Is softener put in the correct compartment of the Put it in the correct drawer? compartment.
  • Page 24 HEATING WITHOUT WATER When pressing Water Plus and Option (Left) buttons at the same time while wash, is the water Replace the level frequency between 230 - 255? S.PRESSURE SWITCH ASSEMBLY Wash Temp. Checking voltage between two pins (Connector Replace the Main PCB RD ①...
  • Page 25 WASH HEATER TROUBLE 113-127 V~? AC 120 V WH/RD BLUE HEATING CONTINUOUSLY ABOVE THE SETTING WATER TEMPER ATURE Option(Left) and Temp. button simultaneously temperature? MAIN PCB ASSEMBLY (Refer to the 7-2 QC Test Mode)
  • Page 26 SPIN TROUBLE Check the S.PRESSURE SWITCH Check on the spinning, is the frequency of the ASSEMBLY or HOSE (Pressure). water level 248 or more. The frequency can be If the problem is on the checked by pressing the Water Plus and Option S.PRESSURE SWITCH Left level buttons at the same time on the program.

  • Page 27: Disassembly Instructions

    9. DISASSEMBLY INSTRUCTIONS Disassemble and repair the parts after pulling out power cord from the outlet. CONTROL PANEL PLATE ASSEMBLY(TOP) ① Unscrew the screws on the top plate. ② The plate assembly(Top) is pulled back and then upward to arrow direction. ③...
  • Page 28 PWB ASSEMBLY(MAIN) ① The back cover is removed. ② One screw is unscrewed. ③ Pull the PWB assembly(Main) to arrow direction ④ Two screws is unscrewed. ⑤ The cover of PWB assembly(Main) is removed. ⑥ Disconnect connector from the wiring. DISPENSER ASSEMBLY ①...
  • Page 29 INLET VALVE ① Disconnect the wiring connector. ② Remove the valve by two screws of the valve holder. When reconnecting the connector VALVE (PRE-WASH) WHITE/BLACK-BLACK VALVE (NORMAL-WASH) GRAY/BLACK VALVE (HOT) BLACK/WHITE DOOR ① Open the door completely. ② Remove the three screws from the hinge. ※...
  • Page 30 ① The plate assembly(Top) is disassembled. ② Pull out the drawer and unscrew 2 screws. ③ Lift the side the Control Panel Assembly and pull it out ① Two screws is unscrewed. ② Push out PANEL ASSEMBLY,CONTROL after Push the hook( ①, ② ) below. PANEL ASSEMBLY, CONTROL ③...
  • Page 31 ① Lift and separate the cabinet cover. ※ NOTE: When assembling the CABINET COVER, connect the Door S/W connector. SWITCH ASSY, DOOR LOCK ① The cabinet cover clamp is removed and the gasket is released. ② Two screws are unscrewed. ③...
  • Page 32 ROTOR ASSEMBLY, STATOR ASSEMBLY, FRICTION DAMPER ① Remove the back cover. Rotor ② After loosening the bolt, Rotor, pull out the rotor. Bolt (R OT OR ASSEMB ① Remove the 6 bolt from the stator. ② Disconnect the 2 connectors. (S TA TOR ASSEMB ①...
  • Page 33 PUMP ① Remove pump outlet hose. ② Remove tub pump bellows. ③ Remove cap(Remaining Hose). ④ Disconnect the wiring. ⑤ Three screws are unscrewed from the cabinet. ⑥ Remove the pump to arrow direction. HEATER ① Loosen the nut. ② Remove washing heater by pulling out. Washing Heater Wire Color:...
  • Page 34 WHEN FOREIGN OBJECT STUCK BETWEEN DRUM AND TUB ① Remove washing heater. ② Remove the foreign object(wire,coin,etc) by inserting long bar in the hole.

  • Page 35: Exploded View And Parts List

    10. EXPLODED VIEW AND PART LIST 10-1.THE PART LIST OF CABINET ASSEMB LY A154 A140 A110 A104 A102 A153 A103 A152 A106 A151 A150 A101 A141 A131 A100 A430 A130 A440 A134 A410 A135 A455 A300 A133 A310 A450 A303 A200 A201 A275...

  • Page 36: The Exploded View Of Control Panel And Dispenser Assembly

    10- 2 THE EXPLODED VIEW OF CONTROL PANEL & DISPENSER ASSEMBLY F300 F324 F321 F462 F170 F160 F432 F225 F430 F220 F441 F215 F110 F216 F210...

  • Page 37: The Exploded View Of Drum And Tub Assembly

    10-3 THE EXPLODED VIEW OF DRUM & TUB ASSEMBLY K351 K350 K360 K143 K123 F140 K361 K411 K121 K122 K410 K125 F320 K320 K111 F310 F466 K110 K141 F464 K140 K105 K410 K115 K130 K135 K610 K510 K611 K530 K560 K512 K131 K572...

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