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▶ 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.

1) Remove front panel and main PCB

assembly

① Remove 5 panel fixing screws attaching the panel

on the back.

② Disassemble Rear Panel.

③ Pull the front panel forward.
④ Disassemble the protective cover.
⑤ Disconnect the leads from the controller.

⑥ Remove 9 screws on the PCB assembly.
⑦ Disassemble PCB assembly.

Rear Panel

Main PCB

Protect cover

Display PCB

4-2. DISASSEMBLY INSTRUCION

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Содержание 796.3152#21

Страница 1: ...WASHING MACHINE SERVICE MANUAL READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT CAUTION MODEL 796 3152 21 ...

Страница 2: ...ric shock or personal injury when using this appliance follow basic precautions including the following Disconnect this appliance from the power supply before servicing Turning the controls to the off position does not disconnect this appliance from the power supply Failure to do this can result in shock Reconnect all grounded devices after servicing Failure to do this can result in shock CONTENTS...

Страница 3: ...145 5 lbs 66kg Cycles Normal Casual Cold Clean Heavy Duty Bulky Bedding Whitest Whites Rinse Spin Kids Wear Towels Workout Wear Colors Express Wash Handwash Wool Delicates Sanitize Time Delay 1 19Hr Lid Interlock Switch Magnet Sensor Control Lock Yes Softener Dispenser Yes Detergent Dispenser Yes Bleach Inlet Yes Auto Power Off Yes Smart Rinse with Jet Spray Yes Heater Yes ...

Страница 4: ...se and malfunctioning 1 Installation area Install the washer on a firm flat surface If the washer is installed on an unsuitable floor it could make considerable noise and vibrate 2 3 Checking level Open the lid check if the washer is correctly leveled by looking down from the top If a gap is seen between the tub and drum the washer is not level Right Wrong No shims It would be dangerous If the flo...

Страница 5: ...wer Distance between the drain hose and the wall Distance between the drain hose and 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 Do not install the washer in the following places Where the washer is exposed to direct sunlight Near a heater or heating appliance Where the washer is exposed to freezing temperatur...

Страница 6: ...k for any water leakage Connecting Water Supply Hose to the machine Connect the water supply hose to inlet valve of the washing machine and then lock it by turning the hose connecting part Check to see if there is a rubber seal inside the connector A new washing machine should be installed with new hoses The old hoses shuld not be reused Screw Type Hot Cold Water tap Rubber Seal Water Supply Hose ...

Страница 7: ...avoid siphoning and odor build up Cable Tie Cable Tie 35 47 0 9 1 2m 35 47 0 9 1 2m WARNING The washer should never be installed or stored in a location subject to freezing temperatures If the washer was exposed to freezing temperatures prior to installation allow it to stand at room temperature for several hours before use Damage to the water lines and internal mechanisms of the washer can result...

Страница 8: ...washing machine for correct balance spin operation Multi Clean filter TUB HOT WATER SUPPLY HOSE COLD WATER SUPPLY HOSE Make sure the water does not leak POWER PLUG If the supply cord is damaged it must be replaced by the manufacturer or its service agents or similarly qualified person in order to avoid a hazard FUNCTION SELECTOR BASE DRAIN HOSE Be sure the drain hose is properly installed on the d...

Страница 9: ...ippers hooks and strings to make sure that these items don t snag on other clothes The nylon washing bag is not supplied by LG Check all pockets to make sure that they are empty Things such as nails hairclips matches pens coins and keys can damage both your washer and your clothes Mend any torn garments or loose buttons Tears or holes may become larger during washing Remove belts underwires etc to...

Страница 10: ...r additional steps may be needed Adjust Detergent amount and pre dissolve Detergent in WARM water Pretreat spots and stains Soak heavily soiled items Use appropriate bleach Temperature below 18 C 65 F will not activate laundry additives and may cause lint residue poor cleaning etc In addition detergent manufactures and care labels define COLD water as 26 29 C 80 85 F If the temperature of the wate...

Страница 11: ...lorine bleach directly onto clothes or into the wash basket Do not pour powdered bleach into bleach dispenser Avoid overfilling or splashing when adding bleach to the dispenser The maximum capacity of the bleach dispenser is one cup of bleach per wash cycle Overfilling could result in premature dispensing of bleach 3 Before starting the washer pour measured amount of bleach directly into bleach di...

Страница 12: ...dispensed at the appropriate time for the most effective cleaning After adding the laundry products to the dispenser close the dispenser drawer To add detergent bleach and fabric softener to the automatic dispenser Open the dispenser drawer Load the laundry products into the appropriate compartments Close the lid slowly and smoothly to avoid spilling splashing or premature dispensing of the conten...

Страница 13: ... it can lead to oversudsing and detergent residue being left on the clothes Pour the recommended amount of liquid fabric softener into the left hand compartment Use only liquid fabric softener Dilute with water to the maximum fill line Do not exceed the maximum fill line Overfilling can cause early dispensing of the fabric softener which could stain clothes NOTE Do not pour fabric softener directl...

Страница 14: ...umes may result Never wash items which have been previously cleaned in washed in soaked in or spotted with gasoline dry cleaning solvents or other flammable or explosive substances because they give off vapors that could ignite or explode Never use highly flammable solvents such as gasoline inside the home Vapors can explode on contact with flames or sparks For successful stain removal Remove stai...

Страница 15: ...e for fabric Scrape residue from fabric Pretreat Wash using hottest water safe for fabric For heavy stains and tar apply nonflammable dry cleaning fluid to back of stain Replace towels under stain frequently Rinse throughly Wash using hottest water safe for fabric Some inks may be impossible to remove Washing may set some inks Use prewash stain remover denatured alcohol or nonflammable dry cleanin...

Страница 16: ... loads with multipletypes of soils With this option the water temperature is raised in three steps to optimize cleaning performance During the final wash step the water is heated and maintained at the highest temperature for that cycle for 10 minutes Stain Treat This option saves energy by using cooler temperatures and different operations to help maintain washer performance while reducing energy ...

Страница 17: ...mall load less than 8 pounds and a low spin speed Cold Clean START PAUSE BUTTON Use to start or pause the wash cycle Changes while be made to the wash settings while the machine is paused Repeats start and pause by pushing the button CYCLE BUTTON Use for selecting wash program This button allows the selection of 10 different programs for different kinds of laundry and dirtiness Program selections ...

Страница 18: ...Cotton shirts jeans soxs pants 3 4 WASHING PROGRAMS 18 ...

Страница 19: ...19 ...

Страница 20: ... DO NOT put them in washer or dryer Some pretreatment sprays or liquids can damage your washer s control panel Use of dyes in your washer may cause staining of the plastic components The dye will not damage the machine but we suggest you thoroughly clean your washer afterwards We do not recommend the use of dye strippers in your washer Do not use your washer lid as a work surface If frozen Remove ...

Страница 21: ...4 SERVICE INFORMATION 4 1 WIRING DIAGRAM 21 WIRING DIAGRAM ...

Страница 22: ... regular basis to remove any static charge built up on your person 1 Remove front panel and main PCB assembly Remove 5 panel fixing screws attaching the panel on the back Disassemble Rear Panel Pull the front panel forward Disassemble the protective cover Disconnect the leads from the controller Remove 9 screws on the PCB assembly Disassemble PCB assembly Rear Panel Main PCB Protect cover Display ...

Страница 23: ...ord Inlet Valve Figure B Disconnect the leads from the inlet valve and remove three screws Remove the hoses and output pipes from the input valve Remove the inlet valve Pressure Switch Figure C Disconnect the leads from pressure switch and disassemble pressure switch Disconnect pressure tube from the pressure switch DT Housing Figure D Remove the hoses and output pipes from the input valve Disasse...

Страница 24: ...de between the cabinet and the top cover to release the latches Lift the top cover Use the blade to push the left hinge out of the way and to displace the hinge pin to remove the lid Remove the lid by pulling the right hinge pin out of its holder close open ...

Страница 25: ...out Remove the pulsator washer and take it out Tub Cover Inner Tub Cap Hub Fixing Nut Outer Tub Inner Tub Stator Rotor Nut Hub Attachment Nut Shaft Bearing Housing ASM Rotor Inner Tub Cap Hit the bar using the hammer Disconnect hub fixing nut and disassemble the inner tub 5 Assemble the service tool 38 mm wrench 6 Remove the hub attachment nut 38 mm ...

Страница 26: ... top cover of the washing machine As shown in the drawing lift the damper assembly and remove it along with the outer tub assembly Damper assembly shall not be disassembled Replace damper as assembly 6 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 screw...

Страница 27: ...g sure it faces the rotor and stator To keep from dropping the stator loosen the six bolts almost all the way then hold the stator in one hand while removing the bolts with the other Be careful during removal and replacement to avoid cutting nicking or pinching any of the wires This could cause a short or electrical noise in the machine Remove the screws that secure the water guide ...

Страница 28: ...Heater Remove the three heater attachment screws Loosen the nut at the middle of the heater to relieve the tension on the clamp Then pull it out of the case Remove 17 screws to release the bearing housing Pull the housing away from the tub but do not pry it with a screwdriver to avoid damage Remove four screws to release the tub bracket Bearing Housing ...

Страница 29: ...9 time Agitate tub check T7 and the coefficient of load sensing 10 time High speed spin T8 and RPM Off 11 time Unlocks the door None Turns off all LED Number of times the START PAUSE button is pressed Check Pont Display Status 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 e...

Страница 30: ...or Soak Heavy wash cycle for heavy soiled laundry Separate heavily soiled items from lightly soiled ones Pretreat stain and heavy soil according to directions shown on page 15 Pretreat the stain with detergent or a stain removal agent Do not overfill fabric softener dispenser and do not pour liquid fabric softener directly onto fabric See page 13 for more instructions Keep the recommendations agai...

Страница 31: ...31 4 5 TROUBLESHOOTING SUMMARY Display Pin1 Tx Pin2 Rx Pin3 SMPS2_5V Pin4 GND Pin5 Standby Pin6 SMPS2_13V Pin7 TEST r e t a e H ...

Страница 32: ...ck the Presure Sensor 21 23 Ω 10 and connection 2 Check the Connector BL6 1 Check the connector of PCBA YL3 BL6 or motor connector or connection connector 2 Check the magnet for Rotor 3 Check the Rotor Resistance YL3 5 to 15 Ω U V V W W V U 1 V 2 W 3 1 Check the fuse for noise filter and PCBA by tester 2 Check the IPM Check the Short between top switch Heatsink and YL3 pin by Tester Check counterp...

Страница 33: ... running 120V 5 Stopped Motor Pump 0 1V Method 1 Enter the SERVICE Mode 2 Press START PAUSE button 1 time Main version 2 times Display version 3 times Inlet valve check mode 4 times Cold valve bleach valve 5 times Rinse valve hot valve 6 times Jet spray valve 7 times Heater check 8 times Alph check 9 times Pump check Note Environmental check list 1 The drainage hose must not stay in a lower positi...

Страница 34: ... Is the resistance values in the range of 5 to15 Ω U V V W W V U 1 V 2 W 3 After pull out the YL3 connector check the terminal of the connector in wire No Replace the ROTOR Replace the STATOR Replace the Hall sensor Replace the MAIN PCB ASSEMBLY Part of motor Motor Hall Sensor Hall Sensor Hall Sensor Hall Sensor Hall Sensor Hall Sensor Hall Sensor Hall Sensor Hall Sensor Hall Sensor Hall Sensor Ha...

Страница 35: ...Does the inlet valve work when the power is not applied Replace the INLET VALVE ASSEMBLY No Adjust the height of washing machine to be kept horizontally Yes If the inlet valve works continuously when the power is applied replace the MAIN PCB ASSEMBLY OVER FLOW ERROR Yes Is FE displayed Check the AIR CHAMBER and the tube clogged Yes When you enter the service mode is the water level frequency over ...

Страница 36: ...onnected to pressure sensor disconnected or disassembled Yes Replace the pressure switch No Is the resistance of the pressure sensor out of range pin 1 pin 3 21 23 Ω 10 Yes No Is the AIR CHAMBER and the tube clogged Yes Fix the air chamber and remove the foreign material Replace the MAIN PCB assembly ...

Страница 37: ... three pin wire of display PCB broken Yes Replace the MAIN PCB ASSEMBLY No Is LED on while the power is on Yes Check the fuse or reset the circuit breaker Yes Is the supplied voltage 120V AC 10 15 No Reconnect or repair the connector Yes Is the connector connected to PCB Noise filter disconnected or disassembled No Alternate with explanation Yes Is the current rating of multi outlet power strip en...

Страница 38: ...nd and LED light while touch the LCD Yes Yes No Is the connector connected to Main PCB Display PCB disconnected or disassembled Reconnect or repair the connector Connecting connector Main PCB Display PCB POWER BUTTON DOESN T WORK Yes No Is the button of panel stuck Repair the button ...

Страница 39: ...urn the power off and do voltage discharge sufficiently Wiring diagram Test points and Result Circuit in the MAIN PCB Wiring Diagram MAIN PCB ASSEMBLY 3 3 1 1 RD1 WH1 Vac 1 1 2 2 2 2 Test Points WH 1 to RD 1 WH 3 to RD 2 Result 0 Ω 0 Ω 1 3 1 2 RD1 WH1 WARNING 5 COMPONENT TESTING INFORMATION ...

Страница 40: ...etected when switch sensing point is detected lock position The motor stops Door locked The maximum allowable number of impulse authorizations is 3 Upon the third authorization of the impulse the position of hook goes back to the door open position Authorizing the impulse occurs in 4 5 seconds upon input for max performance and two authorization processes are allowed at most 2 Operation for door o...

Страница 41: ...41 Result 33 46 Ω 9 11 AT Test points Result Test Points 1 To 2 1 Black 2 Brown 4 To 5 4 White 5 Green 1 2 3 4 5 6 ...

Страница 42: ...ed 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 brushes to wear out Unlike a more traditional brushless motor the rotor surrounds the stator rather than being attached to it Result 5 15 Ω 5 15 Ω 5 15 Ω Test Points 1 to 2 2 to 3 3 to 1 WINDINGS 1 HALL SENSOR 3 2 ...

Страница 43: ...carefully move test leads to terminals 1 to 4 blue and gray Slowly rotate motor rotor by hand You should read a pulsing 10 Vdc If 10 Vdc is measured from 1 to 4 move lead on blue wire to red wire terminal 2 Repeat rotating motor rotor by hand You should read a pulsing 10 Vdc from red to gray 8 If pulsing 10 Vdc is measured from 1 to 4 and 2 to 4 hall sensor is OK If either test netted only 9 to 10...

Страница 44: ...5 Vdc is measured the control board is defective 8 Place meters leads on Blue to Yellow Turn motor rotor slowly by hand You should measure a pulsing 10 Vdc Place meter leads on Red to Yellow Turn motor rotor slowly by hand You should measure a pulsing 10 Vdc If both tests measure a pulsing 10 Vdc hall sensor and harness OK If either or both tests measures 9 to 10 volts but does not pulse or change...

Страница 45: ...45 5 4 PUMP MOTOR ASSEMBLY Wiring diagram Test points and Result Circuit in the MAIN PCB Wiring Diagram 1 2 Result 10 9 Ω 5 Remarks Resistance Test Points 1 to 2 ...

Страница 46: ...t valve driving circuit Test Points Result 1 2 24 10 Ω Depending on the cycle and water temperature the controller will energize the hot or cold water valve solenoids to meet the selected water temperature After unplugging the connector of the defective valve check the resistance 1 2 2 2 2 2 1 1 1 1 All valves operate at 13 5 VDC ...

Страница 47: ...Test Points 1 to 2 Result 12 18 Ω 1 The wash heater is designed to raise the wash water to the desired temperature selection during certain wash cycles 2 The steam generator heater is designed to make the water to the steam during steam cycles Heater driving circuit WASH HEATER Wash Heater Wash Heater 1 2 ...

Страница 48: ...7 THERMISTOR ASSEMBLY Wiring diagram Function Test points Circuit in the MAIN PCB Wiring Diagram Wash Thermistor The thermistor temperature sensor is used to monitor water temperature in the tub MAIN PCB 2 1 ...

Страница 49: ...it standard The upper limit 70 519 46 997 22 285 15 803 6 984 5 180 76 531 50 584 23 623 16 635 7 471 5 573 82 848 54 307 24 978 17 467 7 971 5 981 Test Points 1 to 2 Remarks Result At 86 30 At 104 40 At 140 60 At 158 70 At 203 95 At 221 105 ...

Страница 50: ...6 EXPLODED VIEW 50 BODY A BODY B ...

Страница 51: ...5 1 EXPLODED VIEW OF TOP COVER ASSEMB LY 51 A100 A140 A157 A020 A148 A050 A062 A056 A061 A063 A011 A200 A202 A230 A410 A241 A135 A105 A240 A180 A186 A183 A184 A390 A380 A125 A147 A150 A190 ...

Страница 52: ...5 2 EXPLODED VIEW OF OUT CASE ASSEMB LY 52 F070 F080 F011 F032 F004 F013 F002 F003 F000 F012 F005 F015 F150 F020 F100 F090 F027 F023 ...

Страница 53: ...5 3 EXPLODED VIEW OF TUB ASSEMB LY 53 K000 K005 K100 K250 K060 NATURAL K340 K345 K200 K210 K201 K305 K300 K170 K290 K410 K230 K050 K140 K350 K430 K400 K420 K040 K012 K030 K020 K021 K061 K064 ...

Страница 54: ...54 7 REPLACEMENT PART LIST ...

Страница 55: ...P No MFL40322150 ...

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