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LG WF-T851 Service Manual

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WASHING MACHINE

SERVICE MANUAL

CAUTION
BEFORE OFFERING SERVICE, READ THIS MANUAL
CAREFULLY TO DIAGNOSE
TROUBLES CORRECTLY.
MODEL : WF-T851 / T852 / T853 / T802 / T902
WF-T652(T652A) / T452(T452A) / 402

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Summary of Contents for LG WF-T851

  • Page 1: Washing Machine

    WASHING MACHINE SERVICE MANUAL CAUTION BEFORE OFFERING SERVICE, READ THIS MANUAL CAREFULLY TO DIAGNOSE TROUBLES CORRECTLY. MODEL : WF-T851 / T852 / T853 / T802 / T902 WF-T652(T652A) / T452(T452A) / 402...

  • Page 2: Table Of Contents

    CONTENTS 11. SPECIFICATIONS ........................3 12. FEATURES & TECHNICAL EXPLANATION ................4 13. PART IDENTIFICATION ......................12 14. INSTALLATION INSTRUCTION ....................15 15. SCHEMATIC DIAGRAM ......................18 16.OPERATING INSTRUCTION ....................20 7.PROGRAM CHART ........................34 18. TEST RUNNING WITHOUT WATER..................41 09. ADJUSTMENT .......................... 45 10.

  • Page 3: Specifications

    1. SPECIFICATIONS ITEM WF-T902 WF-T851 WF-T853 WF-T802/T852 WF-T652(A) WF-T452(A) WF-402 Refer to rating label on the back of washer POWER SOURCE CAPACITY Refer to rating label on the back of washer WASH TYPE IMPELLER TYPE WEIGHT(NET) 47 kg 41 kg...

  • Page 4: Features & Technical Explanation

    2. FEATURES & TECHNICAL EXPLANATION FUZZY LOGIC CONTROL 2-1.FUZZY CONTROL DIAGRAM Clothes amount sensor measuring loads by measuring loads by measuring loads by measuring loads by turning the pulsator turning the pulsator turning the pulsator turning the pulsator 2 times 2 times 2 times 2 times...
  • Page 5 2-2.COMPARISON OF FUZZY WASHER & CONVENTIONAL WASHER Control Concept Fuzzy It senses and controls the categories between Washer yes and no. High Washing Process Sensing Fuzzy Control Auto Setting Laundry #Water Level Auto amount Start Washing power off sensor Fuzzy #Wash Time Reasoning #Wash Action...
  • Page 6 2-3. TURBO DRUM WASH (Except for WF-4020 A) FUNCTIONAL PRINCIPLE °· Pulsator rotates right & left direction by motor driving force and drum rotates in the opposite direction to the pulsator by inertia force & motor driving force, that is achieved by the new clutch and the new drain motor, while only pulsator rotates right &...
  • Page 7 B) WORKING PRINCIPLE BY PROCESS SENSING WASH LAUNDRY DRAIN SPIN AMOUNT RINSE 1. Clutch mechanism ¡¤ Clutch Spring-B(¨Ï ) ¡¤Released ¡¤Released ¡¤Fastened ¡¤Fastened ¡¤Brake Band(¨Ð) ¡¤Fastened ¡¤Released ¡¤Released ¡¤Released ¡¤ Clutch Lever ¡¤ Do not work ¡¤ 1st step moved ¡¤...
  • Page 8 C) STRUCTURE OF THE NEW CLUTCH Two clutch cams Two clutch bosses D) DRAIN MOTOR & CIRCUIT DIAGRAM 3Pin WASH SPIN PINK BL / WH AC(Rating Voltage)
  • Page 9 2-4. REED SWITCH FOR APPLIANCE SAFETY(WF-402, T652A, T452A) LC Harmonic frequency Inductance [mH] h[mm] Interrupt system of reed S/W is differed from safety S/W incorporated in the previous models. Reed S/W is located on PWB ASM and operated with a magnetic <...
  • Page 10 1times but 2nd unbalance will make the machine stop and “UE” is on the DISPLAY. In that case, open the lid, correct the unbalance and press the START/PAUSE button. 2-8. LID SWITCH FOR APPLIANCE SAFETY (WF-T851, T902) Interrupt system of LID SWITCH is differed from SAFETY SWITCH incorporated in the others models. LID SWITYCH is located on TOP COVER and operated with a magnetic incorporated inside of LID-B systemically.
  • Page 11 2-9. NEW UNBALANCE SENSOR (OPTICAL BALL SENSOR) / WF-T851, T902 To detect unbalance, the optical sensor, BALL SENSOR, is used, which is differed from SAFETY SWITCH incoporated in others models. In normal operation, +5 of voltage is applied between DIODE and TR. In the abnormal operation like unbalance of clothes during spinning, etc, the ball inside of case is moved from the hole.

  • Page 12: Part Identification

    3. PARTS IDENTIFICATION 1) WF-T851, T902 START/PAUSE HOT WATER SUPPLY BUTTON HOSE Use to start or stop the washing machine tem- porarily. COLD WATER SUPPLY HOSE Make sure the water FUNCTION SELECTOR does not leak. LINT FILTER Powder detergent box...

  • Page 13: Drain Hose

    2) WF-T802, T852, T853, T652, T652A Powder detergent HOT WATER SUPPLY box for delayed HOSE washing/ softener box COLD WATER SUPPLY HOSE Make sure the water INLET HOLE FOR does not leak. BLEACH LINT FILTER Clean regularly to stop FUNCTION SELECTOR linting on the clothes load.
  • Page 14 3) WF-T452, T452A, 402 DETERGENT HOT WATER SUPPLY DISPENSER HOSE COLD WATER SUPPLY HOSE SOFTENER INLET Make sure the water Softener will automatically does not leak. flow into the tub. DRAIN HOSE Check if the drain hose INLET HOLE FOR is located in the laundry BLEACH tub before operating the...

  • Page 15: Installation Instruction

    4. INSTALLATION INSTRUCTION A.HOW TO INSTALL THE WASHING MACHINE §• §• Selection of the installing place Install the washer on the horizontal solid floor. If the washer is installed on an unsuitable fioor, it could make considerable noise and vibration. §•...

  • Page 16: Washer Cabinet

    B.HOW TO LEVEL THE WASHING MACHINE ¡¤ Check the level of the washing machine using a spirit level on the side of the washer cabinet ¡¤ You can check the level also by visually lining up the washer with the fills, adjacent walls or cabinets. WF-T652(A) WF-T452(A), 402 WF-T902, T851, T853, T802, T852...
  • Page 17 Make sure that the holder keeps firmly 1.2m the drain hose so that the drain hose should not fall down as shown in the fig. (WF-T851, T853, T802, T852) ❏ NOTE Holes for the Holder To prevent syphoning, the drain hose should not extend more than 50 mm from the end of the hose guide.

  • Page 18: Schematic Diagram

    6. SCHEMATIC DIAGRAM WF-T851 WF-T853 BASE / LINE BASE / LINE WIRING DIAGRAM WIRING DIAGRAM CONTROLLER ASM CONTROLLER ASM (LGN) (OR) BL (BN) (SBL) (OR) (PK) RD(PK) BL(WH) YL(LGN) WH(OR) GY(OR) BL(WH) VL(BN) BL(WH) 1 2 3 1 2 3...
  • Page 19 WF-T652 WF-T902 BASE / LINE WIRING DIAGRAM CONTROLLER ASM RD(PK) BL(WH) YL(LGN) WH(OR) GY(OR) BL(WH) VL(BN) BL(WH) 1 2 3 FUSE PRESSURE SAFETY SWITCH SWITCH NOTES NOTES RD BL YL BK(BN) #187 Receptacle (WH) #250 BN ( BK) Receptacle 1 Pin Housing 2 Pin Housing...

  • Page 20: Operating Instruction

    6. OPERRATING INSTRUCTION 1) WF-T851 ❏ Manual control ❏ Fully automatic contro Other programmes are selected as follows. The Normal program is used for average day to Add detergent, bleach and conditioner as Press POWER ON button. day washing. desired.
  • Page 21 2) WF-T853 ❏ Manual control ❏ Fully automatic contro The Normal program is used for average day to day Close the lid and press START/PAUSE button. Other programmes are selected as follows. Press POWER ON button. washing. The water level lights will scroll up and down while the Load clothes.
  • Page 22 3) WF-T802, T852 ❏ Manual control ❏ Fully automatic contro The Normal program is used for average day to Load clothes. Other programmes are selected as follows. Press POWER ON button. day washing. Add detergent, bleach and conditioner as desired. Load clothes.
  • Page 23 3) WF-T902, T852 ❏ Manual control ❏ Fully automatic contro The Normal program is used for average day to Other programmes are selected as follows. Load clothes. Press POWER ON button. day washing. Load clothes. Press POWER ON button. Add detergent, bleach and conditioner as desired. Close the lid and press START/PAUSE button.
  • Page 24 5) WF-T652, WF-T652A ❏ Manual control ❏ Fully automatic contro The Fuzzy program is used for average day to day Close the lid and press START/PAUSE button. Other programmes are selected as follows. Press POWER ON button. washing. The water level lights will scroll up and down while the Load clothes.
  • Page 25 6) WF-T452, T452A ❏ Manual control ❏ Fully automatic contro The Normal program is used for average day to day Close the lid and press START/PAUSE button. Other programmes are selected as follows. Press POWER ON button. washing. The water level lights will scroll up and down while the Load clothes.
  • Page 26 5) WF-402 ❏ Manual control ❏ Fully automatic contro The Fuzzy program is used for average day to day Close the lid and press START/PAUSE button. Other programmes are selected as follows. Press POWER ON button. washing. The water level lights will scroll up and down while the Load clothes.

  • Page 27: Program Chart

    7. PROGRAM CHART 1) WF- T902 (Time chart)
  • Page 28 2) WF-T851(Time chart)
  • Page 29 3) WF-T802(Time chart)
  • Page 30 4) WF-T853(Time chart)
  • Page 31 5) WF-T652, T652A(Time chart)
  • Page 32 6) WF-T452, T452A (Time chart)
  • Page 33 7) WF-402 (Time chart)

  • Page 34: Test Running Without Water

    8.TEST RUNNING WITHOUT WATER 1) WF-T851, T902 • To use the CHECK PROGRAM (QC TEST MODE),while pressing the ¡AWATER LEVEL¡Bbutton, press the ¡ A POWER¡B button.Do not deposit any laundry in the wash tub while in this mode. • In QC TEST MODE all LEDs are on and press START(PAUSE) button to check over the following items.
  • Page 35 2) WF-T802, T852 • To use the CHECK PROGRAM (QC TEST MODE),while pressing the ¡AWATER LEVEL¡Bbutton, press the ¡ A POWER¡B button.Do not deposit any laundry in the wash tub while in this mode. • In QC TEST MODE all LEDs are on and press START(PAUSE) button to check over the following items.
  • Page 36 3) WF-T853, T652, T652A, T452, T452A • To use the CHECK PROGRAM (QC TEST MODE),while pressing the ¡AWATER LEVEL&PROCESS¡Bbuttons, press the ¡ A POWER¡B button.Do not deposit any laundry in the wash tub while in this mode. • In QC TEST MODE all LEDs are on and press START(PAUSE) button to check over the following items.
  • Page 37 WF-T402 • To use the CHECK PROGRAM (QC TEST MODE), press WATER LEVEL key, at the same time and then the POWER switch on without depositing any laundry. CHECK METHOD LED INDICATOR CHECK ITEM Initial state • All LED on. •...

  • Page 38: Adjustment

    9. ADJUSTMENT 9-1. BRAKE LEVER ADJUSTMENT 2.5~3.5mm clearance • Shown as in the figure, untighten the adjustment should be obtained. screw to keep clearance 1.9¡¾0.1mm between the tip and the brake lever. Wire Keep the clearance than And turn on the lock nut then paint it red. 0.1mm between the tip of the adjustment ¡á...
  • Page 39 Fig.1 10-1. Replacement of Controller Part ¦_ ¦_ WF-T851, T902 1.Disassemble inlet valve ring. 2. Loosen the two screws on the back side and disassemble back panel(joined control panel) from top cover.
  • Page 40 10-2. Disassembling of Top Cover ¢º Loosen the two front special screws and the two fixing screws in the back side(Fig.4) and disassemble top cover from washing machine. Fig.4 10-3. Replacement of Tub Parts Tub cover ¢º As in Fig.6, disassemble top cover and loosen the 5 screws on tub cover.
  • Page 41 ¢º As in Fig.10, lift snubber bar and take it out of out case with out tub. ¢º Damper assembly shall not be disassembled. Replace damper as assembly. ¢º For assembly, refer to Fig.10. ¦_ ¦_ WF-T851, T902, T853, T852, T802, T652, T652A Fig.9 Class LOC. No. PIVOT(Color) K102...
  • Page 42 10-5. Disassembly of Inlet Valve ASM and Lid-B D.T Housing ASM Back Panel ¦_ ¦_ WF-T851, T902 Detergent 1. Open lid assembly and disassemble detergent box. 2. Disassemble back panel(joined control panel)from top cover. 3. Remove two inlet valve screws and pull up inlet valve from D.T housing as in Fig.

  • Page 43: Fuse Replacement

    10-6. Fuse Replacement 1. Be sure to unplug the power. 2. Disassemble back panel (Joined control panel) from top cover. 3. Take out the fuse holder on the back and open it. 4. Remove fuse from the fuse holder and replace it. Fuse holder 5.
  • Page 44 10-7. Replacement of Drain pump. ¢º Check water is remained before the drain pump servicing. 1. Be sure to unplug the power. 2. Loosen the 4 screw on the back side and disassemble back cover from the machine. 3. Disconnect the pump lead wire housing. 4.
  • Page 45 11.TROUBLE SHOOTING METHODS ACCORDING TO DISPLAYED ERROR MODE 1) WF-T851, T852, T853, T802, T652, T652A, T452, T452A ¡á ERROR DECISION BASIS AND CHECKING METHODS ERROR DECISION CAUSE FOR ERROR ERROR REMEDY BASIS OCCURRENCE WATER • Water level does not • Water faucet is closed? •...
  • Page 46 VIOLET(VL) 2 PIN CONNECTOR to the P.W.B ASM has bad connection. displayed • S.F S/W is bad or bad contact. • Check and replace S.F S/W. WF-T802/T852/T902 or BALL SENSOR.(WF-T851) DOOR Er. lamp blinks • SIGNAL continuously ringing. • Water Pressure Switch PRESSURE •...
  • Page 47 2) WF-402 °· ERROR MESSAGE AND CHECKING METHODS ERROR DECISION CAUSE FOR ERROR ERROR REMEDY BASIS OCCURRENCE • Water level does not • Open water faucet. WATER • Water faucet is closed? rise to the set level • Wait until water supply is SUPPLY •...
  • Page 48 ERROR DECISION CAUSE FOR ERROR ERROR REMEDY BASIS OCCURRENCE • LID is opened in the • Lid is opened during intermittent • Closed the lid. course of DOOR spin or normal spin? intermittent spin, OPEN • Lid is opened while processing •...

  • Page 49: How To Diagnose And Repair By Symptom

    12.HOW TO DIAGNOSE AND REPAIR BY SYMPTOM 12-1. Washer is not energized. Where, what & how to check? Result of Check Possible Cause How to repair & settle Household Power supply Change the electrical. 1. Check whether connection between Poor Defect of the the plug and the electrical is poor electrical...

  • Page 50: Reset During Operation

    Less than °§ °§HIC(hybrid IC) / WF-T851 AC 4.6V or Defect of the Change the controller. 1. Measure the secondary voltage of More than 5.3V HIC.

  • Page 51: Water Doesn't Come Into The Wash Tub

    12-3.Reset During operation Where, what & how to check? Result of Check Possible Cause How to repair & settle Drain Motor Defect of the drain Reset happens 1. Operate washer setting spin only, Change the drain motor motor (A noise after the drain then press the start/pause button generated when the...
  • Page 52 12-4. Water doesn’t come into the wash bowl. Where, what & how to check? Result of Check Possible Cause How to repair & settle Pressure Switch Reconnect the connector Connector is taken 1. Is there PE error on the display PE Error or change leads.
  • Page 53 12-6. Pulsator doesn’t rotate normally. Where, what & how to check? Result of Check Possible Cause How to repair & settle Pulsator rotates at one direction. Change the controller if 1. In the case the pulsator doesn’t Defect of there are no contact controller or poor rotates either clockwise or defects in the leads of...

  • Page 54: Water Does Not Drain

    12-6. Pulsator doesn’t rotate normally. Where, what & how to check? Result of Check Possible Cause How to repair & settle Explain the causes and a 3. Pulsator weakly rotates. Less than 85% Lower voltage. transfomer should be of rating. 1) Check voltage at the power outlet used if necessary.
  • Page 55 12-8.Water drains though it is not the time of drain. Where, what & how to check? Result of Check Possible Cause How to repair & settle Drain Hose 1. Check whether the drain hose is Put the outlet of drain The discharge Wrong installation installed properly so that the...
  • Page 56 12-10. Spin extraction is not proceeded. Where, what & how to check? Result of Check Possible Cause How to repair & settle Motor Change the capacitor There is motor Defect of the 1. In the case that the wash motor after checking defect of capacitor or does not spin during spin extraction;...
  • Page 57 12-11. Spining is going on even though the lid is open. Where, what & how to check? Result of Check Possible Cause How to repair & settle Lid Switch (WF-T851, T902, 402) 1. Check resistance between both Contact points of Change the lid...
  • Page 58 Ball sensor (WF-T851, T902) Defect of the ball Change the ball sensor 0 ~ 1V 1. Check voltage between blue sensor terminal and yellow terminal of the...
  • Page 59 Auto Off Switch or Controller(WF-T851/402) 1.Check whether power is automatically tumed off when turning on the power switch after unplugging the power cord from the outlet Change the switch.

  • Page 60: Exploded View

    13. EXPLODED VIEW BODY-A BODY-B...
  • Page 61 13-1.THE EXPLODED VIEW OF THE BODY-A (WF-T851) :Non-Service Part A050 A311 A312 A313 A170...
  • Page 62 13-2.THE EXPLODED VIEW OF THE BODY-A (WF-T853, T802, T652, T452) : Non-Service Part A210 A020 A021 A011 A022 A160 A026 A220 A030 A170 A040 A180 A050 A191 A152 A190 A151 A060 A192 A202 A201 A200 A100 A230 HOT(ORANGE) A240 A275 COLD(BLUE) A276...
  • Page 63 13-3.THE EXPLODED VIEW OF THE BODY-B :Non-Service Part F070 F010 F001 F000 F080 F082 F081 F020 F021 F090 F024 F023 F050...
  • Page 64 13-4.THE EXPLODED VIEW OF THE TUB ASS'Y...
  • Page 65 FEB. 2000 PRINTED IN KOREA P/No : 3828EA3001Y...

This manual is also suitable for:

Wf-t852Wf-t853Wf-t652Wf-t452Wf-402Wf-t802 ... Show all

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