LG WT7800C Series Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Washer
  5. WT7800C Series
  6. Service manual

LG WT7800C Series Service Manual

Hide thumbs Also See for WT7800C Series:
Table of Contents

Advertisement

Quick Links

WASHING MACHINE
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
MODEL : WT7800C*
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 © 2018~2019 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL
Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the WT7800C Series and is the answer not in the manual?

Questions and answers

Related Manuals for LG WT7800C Series

Summary of Contents for LG WT7800C Series

  • Page 1 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.

  • Page 2: Table Of Contents

    4-2. Wiring Diagram ....... 27 4-3. Test Running Without Water ... 28 4-4. Troubleshooting By Common Washing Problems ......29 4-5. Troubleshooting Summary ....30 Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 3: Specifications

    1 – 19 Hr Lid Interlock Switch Magnet Sensor Control Lock Softener Dispenser Detergent Dispenser Bleach Inlet Auto Power Off Smart Rinse™with Jet Spray Heater Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 4: Installation Instructions

    • Do not install the washer on an inclined floor. Improper installation of the washer may cause noise and malfunctioning. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 5 Near a heater or heating appliance. • Where the washer is exposed to freezing temperatures. • In damp environments such as bathrooms or harmful environments. • Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 6: Connecting Water Supply Hose

    • A new washing machine should be installed with new hoses. The old hoses should not be reused. • Replace hoses every 5 years. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 7: Connect The Drain Hose

    • Plug the power cord of washer into a properly grounded outlet. Failure to do this can result in shock or serious injury. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 8: Operating Instructions

    BASE LEVELLING LEGS Use to level the washing machine for correct balance spin operation. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 9: Before Starting To Wash

    Fasten zippers, hooks, and strings to make sure that these items don't snag on other clothes. ※ The nylon washing bag is not supplied by Kenmore. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 If iron is present in the water, the clothes may become an all-over yellow or they may be stained with brown or orange spots or streaks. Iron is not always visible. Installation of water softener or an iron filter may be necessary for severe cases. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 11 ● Do not use color-safe bleach or Oxi products in the same cycle with liquid chlorine bleach. Main Wash Main Wash Powder Detergent Liquid Detergent Compartment Compartment Liquid Fabric Softener Compartment Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 NOTE: It is normal for a small amount of water to remain in the dispenser compartments at the end of the cycle. NOTE: Do not use powdered or liquid bleach in the dispenser drawer. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 Overfilling can cause early dispensing of presoak additives, which could result in damaged clothes. NOTE : Do not pour additives directly on the wash load. It may stain the clothes. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 • Check care label instructions for treatments to avoid on specific fabrics. • Check for colorfastness by testing stain remover on an inside seam. • Rinse and wash items after stain removal. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 Pretreat with prewash stain remover or nonflammable dry cleaning fluid. Rub detergent into dampened area. Wash using bleach safe for fabric. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 16: Function Of Each Button

    The time shown on the display is the estimated cycle time. If the sensors and microprocessor elect to make changes during the cycle, the display will be adjusted accordingly. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 OFF, and turned ON or OFF. HIGH Adjustment can be made while • washing. Default SOIL LEVEL is Normal. • Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 18: Washing Programs

    Tap Cold No spin Light Heavy Extra high Warm High Whites Semi Warm Normal Medium Light No spin = available option, = default setting Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 Light No spin Heavy High Warm Perm. Semi Warm Medium Normal Press Cold Tap Cold No spin Light = available option, = default setting Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 Extra high High Warm Downloaded Default: Semi Warm Medium Normal Small Load Cold Tap Cold No spin Light = available option, = default setting Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 21: Care And Maintenance

    We do not recommend the use of dye strippers in your washer. • Do not use your washer lid as a work surface. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 22: Service Information

    When assembling the PCB and Front panel by pushing the PCB to the upper and check the Segment seated. After assembly check the light spread. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 Dispenser Housing & Inlet Valve ① Remove the hoses and Lead Wire from the input valve. ② Disassemble the Inlet valve and the dispenser housing. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 ⑥ Remove 1 Screw, Cover, and Safety from the Cabinet. ⑦ According to the environment, place the Top cover on the floor at the side or back of the washer. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 6) Remove the hub attachment nut. (38 mm)  Hit the bar using the hammer.  Disconnect hub nut and disassemble the inner tub. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 26 (The torque should be 250 kgf/cm or 88 foot- pounds.) ■ Remove the rotor by pulling it straight off the splined shaft. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 27 When assembling the rotor, hold the outer parts and to axial direction. Be careful your fingers are not stuck between rotor and stator by magnetic force. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 28 10) Detachment of Bleach Cap Cover Remove the Doorlock switch Wire. ① Push the 4 hooks to the top cover hole to remove. ② Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 29: Wiring Diagram

    4-2. WIRING DIAGRAM Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 30: Test Running Without Water

    Agitate (tub) check and Door Lock check t8 and RPM 12 time Spin check t9 and RPM 13 time Unlocks the door None Turns off all LED Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 31: Troubleshooting By Common Washing Problems

    · Incorrect use of chlorine bleach. or snags · Unfastened zippers, hooks, buckles · Ribs, tears and broken threads · Overloading the washer · Degradation of fabric Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 32: Troubleshooting Summary

    4-5. TROUBLESHOOTING SUMMARY Test Points Result (1) to (2) (2) to (3) (3) to (1) Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 33: Pcb Picture

    4-6. PCB Picture Main PCB Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 34: Troubleshooting With Error Code

    If no beep, change the noise filter, including -. Check the Short between top switch the fuse. Heatsink and GY pin by Tester 2. If beep sound, replace the PCBA. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 35 Check the AIR When you enter the SVC CHAMBER, the Mode, is the water level tube (clogged), frequency below 26.0 kHz? and press switch Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 36 - Part of wire - After pull out the GY3 connector, check the terminal of the connector in wire. Replace the MAIN PCB ASSEMBLY. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 37 If the inlet valve when the power is not work continuously applied? when the power is applied, Replace the MAIN PCB ASSEMBLY Replace the INLET VALVE ASSEMBLY Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 38 (21~23 Ω±10%) Fix the air Is the AIR CHAMBER and the chamber and tube clogged? remove the foreign material Replace the MAIN PCB assembly Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 39: Other Troubleshooting

    Display PCB Reconnect or Is the connector connected to repair the PCB/Noise filter disconnected connector or disassembled? Connecting connector MAIN PCB~ Display PCB Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 40 ASSEMBLY LED light while touch the disassembled? LCD) Connecting connector Main PCB~ Display PCB Is the button of panel stuck? Repair the button Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 41: Component Testing Information

    Circuit in the MAIN PCB / Wiring Diagram Wiring diagram Test points Result Test Points Result WH to BL 0 Ω YL to RD 0 Ω Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 42: Door Lock Switch Assembly

    – maximum of 3 times of the authorizing period - Upon the fourth authorization of the impulse, the position of CAM goes back to the door-close position. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • 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 Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 44: Stator Assembly

    Test points (Windings) (1) (3) Test Points Result (1) to (2) 5-15 Ω Result (2) to (3) 5-15 Ω (Windings) (3) to (1) 5-15 Ω Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 45: Pump Motor Assembly

    Test Points Result (1) to (2) 1.5 – 4Ω (2) to (3) 1.5 – 4Ω (3) to (1) 1.5 – 4Ω (1)(2)(3) Test points Result Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 46: Inlet Valve Assembly

    After unplugging the connector of the defective valve, check the resistance. Test Test points (1)-(2) Points 23~34Ω Result Result Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 47: Exploded View

    6. EXPLODED VIEW BODY-A BODY-B Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 48 A061 A063 A240 A056 A203 A201 A050 A051 A200 A148 A180 A020 A186 A147 A150 A241 A410 A105 A230 A100 A190 A125 A157 A140 Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 49 6-2. EXPLODED VIEW OF OUTER CASE ASSEMBLY F018 F032 F011 F017 F005 F070 F006 F000 F100 F020 F086 F080 F027 F023 S100 Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 50 K200 K290 K230 K210 K310 K201 K300 * If replacing the Clutch Coupling (K170), check for damage on Washer (K310) and replace if needed. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 51: Wiring Diagram

    7. WIRING DIAGRAM Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 52 Jan. 2019 PRINTED IN KOREA MFL69647012 Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

Table of Contents

Save PDF