LG WT7700HVA Service Manual
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LG WT7700HVA Service Manual

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WASHING MACHINE
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
MODEL : WT7700H*A /01
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication,
modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior
written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this
prohibition includes, without limitation, any text, graphics or logos in this Service Manual.
Copyright © 2015 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL

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Summary of Contents for LG WT7700HVA

  • Page 1 Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.

  • Page 2: Table Of Contents

    6-3. Exploded View Of Tub Assembly ..53 4-3. PCB Picture ........7. Troubleshooting Summary ....... 4-4. Test Running Without Water ... 32 4-5. Troubleshooting By Common Washing Problems ......Copyright © 2015 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 3: Specifications

    1. SPECIFICATIONS Model WT7700H*A /01 Electrical 120VAC@60Hz. Inner Tub Stainless Finish W : Blue White V : Stainless Silver K : Black Stainless Door lid Glass Lid Inlet Water Pressure 20~120 PSI (138~827kpa) Rating of Fuse 120V/60Hz Spin Speed 950±50 Weight 166lbs.

  • Page 4: Installation Instructions

    2. INSTALLATION INSTRUCTIONS 2-1. HOW TO ADJUST LEVEL Lower Raise Installation area Checking level Install the washer on a firm, flat • Open the lid, check if the washer is • surface. correctly leveled by looking down If the washer is installed on an •...
  • Page 5 Horizontal setting Distance between the drain hose and the wall Lift the front of the washer and adjust • level by turnings the adjustable legs Distance between the drain hose and • clockwise or using the adjusting plate. the wall should be more than 4 inches (10 cm,) and the distance between any other part and the wall should be more than 1 inches (2.5 cm.)

  • Page 6: Connecting Water Supply Hose

    2-2. CONNECTING WATER SUPPLY HOSE Before connecting the water supply hose to the water tap, check the hose type and then choose the correct instruction here below. Screw Type Attach the water supply hose to the tap. Push the water supply hose up so that the rubber packing Water tap within the hose can adhere completely to the tap.

  • Page 7: Connect The Drain Hose

    2-3. CONNECT THE DRAIN HOSE Insert the end of the drain hose into the drain. • If the drain is large enough for the flange on the hose to fit inside, then do not insert the flange more than 1-2 inches into the drain.

  • Page 8: Operating Instructions

    3. OPERATING INSTRUCTION 3-1. IDENTIFICATION OF PARTS COLD WATER SUPPLY HOSE HOT WATER SUPPLY HOSE Make sure the water Powder detergent does not leak. Box for delayed washing/softener additves box FUNCTION SELECTOR POWER PLUG If the supply cord is damaged, it must be replaced by the manufacturer or its service agents...

  • Page 9: Before Starting To Wash

    3-2. BEFORE STARTING TO WASH Care Labels • Look for a care label on your clothes. This will tell you about the fabric content of your garment and how it should be washed. Sort clothes into loads that can be washed with the same wash cycle, water temperature, and spin speed.
  • Page 10 1) Using Water Water Temperature • The machine sets the appropriate temperature automatically according to the wash program . You can override the preset selection by pressing the water temperature icon. Touch the arrow buttons up or down until your desired temperature setting is displayed. •...
  • Page 11 2) Using Detergent Detergent Follow the detergent package directions. Using too little detergent is a common cause of laundry problems. Use more detergent if you have hard water, large loads, greasy or oily soils or lower water temperature. Choosing the Right Detergent Your washing machine is designed for use with only High-Efficiency (HE) detergents.
  • Page 12 Using the Dispenser Drawer ABOUT THE DISPENSER Main Wash Main Wash Powder Detergent Liquid Detergent The automatic dispenser consists of two Compartment Compartment compartments which hold: • Liquid fabric softener. Liquid Fabric • Liquid or powdered detergent. Softener All laundry products can be added at once in their respective Compartment dispenser compartments.
  • Page 13 Adding Detergent Add measured detergent to the detergent compartment of the dispenser drawer. • Do not exceed the maximum fill line. Detergent is flushed through the dispenser at the beginning of the wash cycle. Either powdered or liquid detergent can be used, but the drawer insert must be removed to use powder.
  • Page 14 3) Special Guide for Stain Removal WARNING ■ Do not use or mix liquid chlorine bleach with other household chemicals such as toilet cleaners, rust removers, acid, or products containing ammonia. These mixtures can produce dangerous fumes which can cause serious injury or death. ■...
  • Page 15 Stain Removal STAIN TREATMENT Adhesive tape, chewing Apply ice. Scrape off excess. Place stain face down on paper towels. Saturate with gum, rubber cement prewash stain remover or nonflammable dry cleaning fluid. Baby formula, dairy Use product containing enzymes to pretreat or soak stains. products, egg Beverages (coffee, tea, soda, Pretreat stain.

  • Page 16: Function Of Each Button

    3-3. FUNCTION OF EACH BUTTON POWER CYCLE BUTTON Use for selecting wash program. • Power on. • This button allows the selection of 14 different • Push again, power goes off • programs for different kinds of laundry and dirtiness. Power goes off automatically after the wash •...
  • Page 17 EXTRA RINSE FABRIC START/ PAUSE BUTTON SOFTENER BUTTON • This includes • Causes the Use to start or pause the wash • an extra cycle. dispensing of rinse cycle fabric softener Changes while be made to the for a better wash settings while the machine in the final rinsing...

  • Page 18: Washing Programs

    3-4. WASHING PROGRAMS. CYCLE GUIDE The cycle guide below shows the default settings, available options Default Setting Available options and recommended fabric types for each cycle. Allowable modifier ● Cannot be used if Steam is selected ★ adjustments are shown below the default setting for each cycle. Turbo Wash™...
  • Page 19 CYCLE GUIDE The cycle guide below shows the default settings, available options Default Setting Available options and recommended fabric types for each cycle. Allowable modifier ● Cannot be used if Steam is selected ★ adjustments are shown below the default setting for each cycle. Turbo Wash™...

  • Page 20: Care And Maintenance

    3-5. CARE AND MAINTENANCE When There Is The Possibility Of Freezing Temperatures • Close the water taps and remove the water supply hoses. • Remove the water which remains in the water supply. • Lower the drain hose and drain the water in the sump and the drain hose by running a spin cycle. If Frozen •...

  • Page 21: Service Information

    4. SERVICE INFORMATION 4-1. DISASSEMBLY INSTRUCTION ▶ Be sure to unplug the power to repair and replace electric parts. ESD (ElectroStatic DIscharge) WARNING Be sure to follow proper ESD and grounding precautions for diagnosis and repair. If this is not possible, touch the ground wire on a regular basis to remove any static charge built up on your person.
  • Page 22 2) Disassembly of the Noise Filter, Power Cord, Inlet Valve, Pressure Switch, and Dispenser Housing. Noise Filter and Power Cord ① Remove the one screws attaching the noise filter. ② Disconnect both connectors in the noise filter. Remove the power cord from the noise filter. Inlet Valve ①...
  • Page 23 3) Disassembly of Top Cover ① Remove 2 screws attaching the back side of top cover. ② Lift the top cover at the back of the washer ③ Push the Top Cover Assembly forward front side until it doesn’t move. ④...
  • Page 24 4) Disassembly of Lid ① Remove Hinge Cover Pull the hook Hook ② Loose 6 black screws ③ Slide the black Smart Hinge left to right...
  • Page 25 Pulsator Cap Pulsator Hub Fixing Nut Tub Cover Outer Tub Inner Tub Pulsator Cap Shaft Ball Balancer Pulsator Screw Bearing Housing ASM Rotor Rotor Nut Stator Pulsator Inner Hub Attachment Nut Tub Cap 5) Disassembly of Tub Cover and Pulsator ①...
  • Page 26 8) Disassembly of the Back Cover and Drain Pump ■ Remove the screws that attach the back cover and take it off. ■ Disconnect the leads and the drain hose from the drain pump. ■ Remove the pump attachment screws and the lead connector.
  • Page 27 ③ Remove the screws that secure the water guide. ④ Disconnect stator connection before removing the stator in the subsequent step. ⑤ Remove the six screws securing the Stator. ⑥ Check the position of the snap ring, being cure it faces the rotor and stator.
  • Page 28 ⑨ Remove 12 screws to release the bearing housing. Pull the housing away from the tub, but do not pry it with a screwdriver to avoid damage. Bearing Housing 11) Disassembly of Door Lock Switch Remove the two door lock attachment screws. ①...
  • Page 29 *Assembly of Lock Clamp and Pressure Hose 1. Insert the clamp into the hole. 2. Widen the clamp. 3. Put the Tube. 4. Tighten the clamp. 5. Assemble the Tube to Outer Tub 6. Assemble snap ring. *Disassembly of Pressure Hose 1.

  • Page 30: Wiring Diagram

    4-2. WIRING DIAGRAM...

  • Page 31: Pcb Picture

    4-3. PCB Picture Main PCB...

  • Page 32: Test Running Without Water

    4-4. TEST RUNNING WITHOUT WATER 1) SAFETY CAUTION • The main power board assembly has exposed live 120 VAC and live DC voltages. Use care when disconnecting connectors during troubleshooting and testing. (Wear electrostatic discharge gloves when handling the board. •...

  • Page 33: Troubleshooting By Common Washing Problems

    4-5. TROUBLESHOOTING BY COMMON WASHING PROBLEMS Many washing problems involve poor soil and stain removal, residues of lint and scum, and fabric damage. For satisfactory washing results, follow these instructions. Use ONLY powdered or liquid HE (High Effificiency) detergents. Do NOT use flakes scraped from a soap cake or bar, flakes, soap ribbons (available in some markets,) detergent tablets, plastic pouches, magic laundry balls, or anything other than powdered or liquid HE detergent products.

  • Page 34: Troubleshooting With Error Code

    4-6. TROUBLESHOOTING WITH ERROR CODE Trouble Check Counterplan 1. Verify the valve is open and water is on. 1. Turn the tap on. 2. Check the filter on inlet valve whether 2. Clean or replace the filter clogged with foreign material or not. 3.
  • Page 35 DRAIN ERROR Is OE displayed? Is the connector connected to Replace the Reconnect or Is the coil of the drain pump pump motor assembly DRAIN PUMP repair the too high or low? (resistance of disconnected or ASSEMBLY. connector the coil is 10-20 Ω) disassembled? Is the voltage between Replace the...
  • Page 36 LOCKED MOTOR ERROR - Part of motor Is LE displayed? Reconnect Check the connectors below. the connector Is the connector disconnected Motor (connector / or disassembled? wire / motor ) (motor hall sensor connector, motor drive connector) Is rotor magnet cracked? - Part of main PCB assembly (YL3, BL6) Replace the...
  • Page 37 UNBALANCE ERROR OVER FLOW ERROR Is UE displayed? Is FE displayed? Does the laundry lean toward When you enter the service Put laundry evenly Check the AIR one side, not evenly put in the mode, is the water level In the DRUM CHAMBER and the DRUM assembly? frequency over 21.0 kHz?
  • Page 38 PRESSURE SENSOR ERROR Is PE displayed? Is the connector connected to Reconnect or pressure sensor disconnected repair the or disassembled? connector Is the resistance of the Replace the pressure sensor out of range? pressure switch (pin 1~ pin 3) (21~23 Ω±10%) Fix the air Is the AIR CHAMBER and the chamber and...

  • Page 39: Other Troubleshooting

    4-7. OTHER 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 PCB assembly, reinsert the connectors correctly. NO POWER Is LED on while the power is Replace the MAIN...
  • Page 40 POWER BUTTON DOESN’T WORK Replace the Is the connector connected to Reconnect or Is the display PCB broken? DISPLAY PCB Main PCB / Display PCB repair the (check the buzzer sound and disconnected or connector ASSEMBLY LED light while touch the disassembled? LCD) Connecting connector...

  • Page 41: Component Testing Information

    5. COMPONENT TESTING INFORMATION WARNING When resistance (Ohm) checking the component, be sure to turn the power off, and do voltage discharge sufficiently. 5-1. FILTER ASSEMBLY (LINE FILTER) Circuit in the MAIN PCB / Wiring Diagram Wiring diagram Test points Result Test Points Result...

  • Page 42: Door Lock Switch Assembly

    5-2. DOOR LOCK SWITCH ASSEMBLY Circuit in the MAIN PCB / Wiring Diagram Wiring diagram The Door Lock Switch Assembly consists of a DC Motor, a Bimetal, a Protection PTC, Sensing Point. It locks the door during a wash cycle. 1.
  • Page 43 Test points Test Points Result (1)To (2) 33 ~ 46 Ω Result (1)-Black / (2)-Brown (4) To (5) 9 ~ 11 AT (4)-White / (5)-Green...

  • Page 44: Stator Assembly

    5-3. STATOR ASSEMBLY Circuit in the MAIN PCB / Wiring Diagram Wiring diagram 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 Function brushes to wear out.

  • Page 45: Pump Motor Assembly

    5-4. PUMP MOTOR ASSEMBLY Circuit in the MAIN PCB Wiring Diagram Wiring diagram * Each circuits of loads in wiring diagram are all same. Test Points Result Remarks (1) to (2) 10.9±5% Resistance Test points Result...

  • Page 46: Inlet Valve Assembly

    5-5. INLET VALVE ASSEMBLY Circuit in the MAIN PCB Inlet valve driving circuit Wiring diagram Wiring diagram 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 water Function valve solenoids to meet the selected water temperature.

  • Page 47: Heater Assembly

    5-6. HEATER ASSEMBLY Circuit in the MAIN PCB Wiring diagram Wiring diagram Heater driving circuit WASH 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 selection during Function certain wash cycles.

  • Page 48: Thermistor Assembly

    5-7. THERMISTOR ASSEMBLY Circuit in the MAIN PCB / Wiring Diagram Wiring diagram MAIN PCB The thermistor (temperature sensor) is used to monitor water temperature in the tub, Steam Function Generator, Dry duct and Condensing duct. Test points Wash Thermistor...
  • Page 49 Wash Thermistor Result [kΩ] Test Points Remarks The lowest standard The upper limit limit (1) to (2) 70.519 76.531 82.848 At 86℉ (30℃) Result 46.997 50.584 54.307 At 104℉ (40℃) 22.285 23.623 24.978 At 140℉ (60℃) 15.803 16.635 17.467 At 158℉ (70℃) 6.984 7.471 7.971...

  • Page 50: Exploded View

    6. EXPLODED VIEW BODY-A BODY-B...

  • Page 51: Exploded View Of Top Cover Assembly

    A011 A062 A061 A063 A240 A056 A203 A202 A050 A201 A148 A200 A180 A184 A165 A390 A020 A183 A152 A166 A186 A154 A153 A147 A151 A150 A241 A410 A105 A230 A100 A190 A125 A157 A380 A140...
  • Page 52 F018 F032 F011 F019 F017 F070 F005 F090 F000 F100 F150 F020 F086 F080 F027 F023 F082...

  • Page 53: Exploded View Of Tub Assembly

    K005 K000 K012 K021 K020 K030 K040 K050 K061 K100 K060 K104 K062 K064 K250 K350 K170 K140 K345 K340 K200 K290 K230 K210 K201 K305 K400 K300...

  • Page 54: Troubleshooting Summary

    7. TROUBLESHOOTING SUMMARY...
  • Page 55 Dec. 2015 PRINTED IN KOREA MFL69181201...

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