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LG WM3570H, Service Manual

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LG WM3570H Service Manual Download Page 28

7-4. TROUBLESHOOTING ELSE

NO POWER

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 PWB ASSEMBLY, reinsert the connectors correctly.

CAUTION

Check the
fuse or reset
the circuit
breaker.

Yes

No

Is the current rating of
multi-outlet power strip
enough?
(Avoid connecting several
electric devices.)

Is the supplied voltage
120V AC?(+10%, -15%)

Alternate with
explanation.

Yes

Yes

No

Is the connector connected
to PCB/Noise filter
disconnected or
disassembled?

Reconnect
or repair
the connector.

No

Replace the
MAIN PWB
ASSEMBLY.

Yes

No

Is LED on while the power
is on?

Replace the
DISPLAY
PWB
ASSEMBLY.

Display PWB

Connecting connector

MAIN PWB~ Display PWB

No

Is five pin wire of
display PWB broken?

28

Summary of Contents for WM3570H

Page 1: ...WASHING MACHINE SERVICE MANUAL CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT MODEL WM3570H A Website http biz lgservice com ...

Page 2: ...g 19 7 1 Safety Caution 19 7 2 Error Mode Summary 19 20 7 3 Troubleshooting With Error 21 27 7 5 Before using the Tag On function 33 7 4 Troubleshooting Else 28 32 8 Component Testing Information 34 8 1 Filter Assembly Line Filter 34 8 2 Door Look Switch Assembly 35 36 8 3 Stator Assembly 37 39 8 4 Pump Motor Assembly 40 8 5 Inlet Valve Assembly 41 8 6 Heater Assembly 42 8 7 Thermistor Assembly 43...

Page 3: ...bo Wash Cold Wash Extra Rinse Rinse Spin Incorporated 14 5 142 PSI 100 980kPa Electronic 4 3 DOE 27 W X 29 3 4 D X 38 11 16 H 51 D door open up to 19 hours PTC Solenoid 10 steps by sensor Incorporated Incorporated Incorporated Incorporated Incorporated 240 W 80 W 1000 W 46 rpm 0 1 300 rpm Blue White VCM AC 120 V 60 Hz 202 8lb 92kg To reduce therisk of injury to persons adhere toall industry recomm...

Page 4: ... consumption Automatic Wash Load Detection Automatically detects the load and optimizes the washing time Built in Heater Internal heater helps to maintain water temperature at its optimum level for selected cycles Child Lock The child lock prevents children from pressing any button to change the settings during operation SMART DIAGNOSIS TM Should you experience any technical difficulty with your w...

Page 5: ...then proceeds Spinning does not proceed until the water in the tub drains to a certain level water temperature washing time rinsing time the best washing performance spin rhythm time load size NEURO FUZZY selected washing temperature SENSING EFFECT PROCESSING DETERMINATION The door can be opened by pulling the door handle whenever washer is not in operation When the cycle is completed the DOOR LOC...

Page 6: ... LOCK lasts after the end of cycle If you want to deactivate this function Press and hold thePre Wash button for 3 seconds 2 8 WATER CIRCULATION When washing and rinsing function of shower at the upper part of Gasket When washing it continuously operates for 3 minutes and intermittently When rinsing it continuously operates after completion of water supply 2 9 STEAM For tough stained clothes sick ...

Page 7: ... components and accessories and are subject to change by the manufacturer without prior notice for product improvement purposes Parts and Accessories Parts Pedestal sold separately Stacking Kit sold separately Accessories Hot cold water hoses Non skid pads Caps for covering shipping bolt holes Wrench Tie strap Elbow bracket for securing drain hose Water inlets Shipping bolts Power cord Drain hose ...

Page 8: ...fter servicing operate the appliance to see whether it functions correctly STANDARD INSTALLATION The appliance should be installed as follows Remove the 4 shipping bolts with the supplied wrench Remove the lower bolts fist It is easier that way Keep the shipping bolts and spanner for future use Insert the 4 caps provided into the hole Turn clockwise to raise counterclockwise to lower Turn the leve...

Page 9: ... connector Tighten the inlet hose securely to prevent leaks Install the inlet hose to correct temperature water tap Otherwise it cause drips on the drawer panel handle and drawer panel HOW TO CONNECT THE INLET HOSE CONNECT THE DRAIN HOSE Make sure that the hose is not twisted The end of the drain hose should be placed less than 96 from the floor Avoid submerging the end of the hose 9 ...

Page 10: ...ck if the drum rotates clockwise and counterclockwise 5 Check the automatic reverse rotation 4 Check the water supply Check if water is supplied through the detergent dispenser 7 Check the drain and spin functions Power off and the power on Press the SPIN SPEED button Press the START PAUSE button Check the spin and drain functions Listen for a click to determine if the door is unlocking 8 Press th...

Page 11: ...WM3570H A 5 OPERATION 5 1 CONTROL PANEL FEATURES 11 ...

Page 12: ...tatus Indicator It shows elapsed time of the cycle the washer is operating Cycle Selector Knob Rotate the Cycle selector knob to select the cycle designed for different types of fabric and soil levels Start Pause Use this button to Start Stop the washer 12 ...

Page 13: ...o wash without hot water and heating EXTRA RINSE This option will add an extra rinse cycle to the selected cycle RINSE SPIN Use this option to rinse detergent from load CHILD LOCK Use this option to prevent unwanted use of the washer or to keep cycle settings from being changed while the washer is operating Wash Temp Spin speed Soil Level Signal Button Select a water temperature based on the type ...

Page 14: ...rts sheets jeans mixed loads 26 53 Hot Warm Cold Tap Cold Extra High High Medium Low No Spin Heavy Normal Light Heavy Duty Heavy soiled Cotton Fabrics 74 131 Hot Warm Cold Tap Cold Extra High High Medium Low No Spin Heavy Normal Light Perm Press Dress shirts pants wrinkle free clothing poly cotton blend clothing tablecloths 33 47 Hot Warm Cold Tap Cold High Medium Low No Spin Heavy Normal Light De...

Page 15: ... prevent unwanted use of the washer or to keep cycle settings from being changed while the washer is operating Press and hold the PRE WASH button for 3 seconds to activate or deactivate The child lock function The child lock indicator will be shown in the display And all buttons are disabled except the ON OFF button NOTE CHILD LOCK lasts after the end of cycle If you want to deactivate this functi...

Page 16: ... and only the drum rotates If water temperature becomes lower than selected because of re supplied water the heating starts again 7 Washing Fuzzy logic decides washing time according to the laundry load water temperature and other factors 8 Drainage A pump motor drains the water from the drum After sensing drained water amount by water level frequency spin starts When a heating course is selected ...

Page 17: ... supply Water supply for rinse process 14 Rinse Rinsing process 15 Last drainage After spin finishes and power is not supplied to motor the drum rotates by remaining spin power If rinse hold is selected the drainage is not proceeded after rinse finishes 16 Disentangling The same as item 9 17 Intermittent spin The same as item 10 18 19 20 21 22 Main spin1 The same as item 11 Main spin2 At the end o...

Page 18: ...6 TEST MODE SPIN SPEED SOIL LEVEL WASH RINSE DELAY WASH Turns on all lamps and locks the door 6 1 6 2 7 6 3 18 ...

Page 19: ...7 TROUBLESHOOTING 7 1 7 2 19 ...

Page 20: ...t of order defective The NFC HARNESS between the NFC PCB ASSEMBLY and DISPLAY PCB ASSEMBLY is cut or not connected open circuited The NFC PCB ASSEMBLY is bad or out of order short circuited The NFC EEPROM is out of order nC is displayed only in the first screen of the Test Mode NFC version is not matched It needs to be exchanged nU is displayed only in the first screen of the Test Mode 8 EEPROM is...

Page 21: ...7 3 TROUBLESHOOTING WITH ERROR INLET VALVE ERROR 21 ...

Page 22: ...DRAIN ERROR WASH RINSE DELAY WASH SPIN SPEED SOIL LEVEL 22 ...

Page 23: ...HEATING ERROR 23 ...

Page 24: ... cracked Hall sensor Motor Drive Hall Sensor part of wire part of motor Motor Yes No Yes Yes Magnet Replace the STATOR Is the resistance values in the range of 5 to 15 Ω U V V W W V U 1 V 2 W 3 After pull out the RD4 connector check the terminal of the connector in wire Red 3P male No Replace the Hall sensor Is hall sensor out of order Refer to 9 3 Stator assembly Hall sensor Yes No Replace the MA...

Page 25: ...the PCB ASSEMBLY No Is DOOR SWITCH ASSEMBLY broken Replace the DOOR SWITCH ASSEMBLY No Yes Does the spring of Latch Hook actuate Replace Door Assembly Yes No Note Environmental check list 1 The machine must operate with all the doors completely closed and locked 2 The washing area must operate with a water temperature not higher than 45 Celsius and must not have more amount of supplied water than ...

Page 26: ...UNBALANCE ERROR OVER FLOW ERROR Note Installation check list WASH RINSE DELAY WASH 26 ...

Page 27: ...connect or repair the connector No No Yes Is the resistance of the pressure sensor out of range pin 1 pin 3 21 23 Ω 10 Replace the pressure switch No Yes Is the AIR CHAMBER and the tube clogged Replace the MAIN PWB assembly Fix the air chamber and remove the foreign material Yes Is PE ERROR displayed 27 ...

Page 28: ...ircuit breaker Yes No Is the current rating of multi outlet power strip enough Avoid connecting several electric devices Is the supplied voltage 120V AC 10 15 Alternate with explanation Yes Yes No Is the connector connected to PCB Noise filter disconnected or disassembled Reconnect or repair the connector No Replace the MAIN PWB ASSEMBLY Yes No Is LED on while the power is on Replace the DISPLAY P...

Page 29: ...BUTTON DOESN T WORK 29 ...

Page 30: ...30 ...

Page 31: ...ompartment 2 Liquid fabric Softener Compartment 3 Prewash Compartment 4 Main Wash Compartment Is the detergent caked or hardened Is water supplied Check the wiring No Are receptacles correctly connected to the terminals of the INLET VALVE ASSEMBLY Put the detergent in the correct place Clean the dispenser Yes Yes No Pre wash Main wash Detergent 1 4 3 2 31 ...

Page 32: ...gent softener bleach put in the correct compartment of the drawer Put it in the correct compartment Clean the cap and container No Yes Yes Yes Secure the bolt Is there friction noise coming from the motor Check hall sensor Replace If defective Then check stator Replace if necessary Check rotor for broken magnets Replace rotor if necessary Yes No Yes 1 Liquid chlorine Bleach Compartment 2 Liquid fa...

Page 33: ...r Refer to the manual of your smart phone for details The Tag On guide Tag On position Look for the Tag On icon next to the LED screen on the control panel This is where you position your smart phone when using the Tag On function with the LG Smart Diagnosis Cycle Download and Laundry Stats features of the LG Smart Laundry DW application When you use the Tag On function position your smart phone s...

Page 34: ...Component be sure to turn the power off and do voltage discharge sufficiently WARNING Wiring diagram Circuit in the MAIN PWB Wiring Diagram Vac MAIN PWB ASSEMBLY FUSE RD1 WH1 LI L2 RI CI C2 C3 3 2 1 3 2 1 Test points and Result Test Points Result WH 1 to RD 3 WH 3 to RD 1 0 Ω 0 Ω 3 1 WH1 3 1 RD1 34 ...

Page 35: ...h terminal 3 4 PTC solenoid will make the door locked Door lock is detected when switches in terminal 4 5 are set closed CAM rotation will forcibly clear off the connection The maximum allowable number of impulse authorizations is 2 Upon the third authorization of the impulse the position of CAM goes back to the door open position Authorizing the impulse occurs in 4 5 seconds upon input for max pe...

Page 36: ...Test points Result Test Points 2 to 4 3 to 4 4 to 5 2 to 4 Result 700 1500 Ω 60 90 Ω Infinity 120 Vac Remarks At 77 F 25 C At 77 F 25 C Voltage Input 5 3 2 4 36 ...

Page 37: ... 1 2 3 4 Hb Function Test points Windings Result Windings The Direct Drive 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 brushes to wear out Unlike a more traditional brushless motor the rotor surrounds the stator rather than being attached to it Test Points Result 1...

Page 38: ...he Hall Sensor use the following steps 1 Unplug power cord 2 Remove rear washer panel 3 Locate Hall sensor connector on the stator behind the rotor 4 Place meter leads on terminals 5 to 4 white to gray 5 Plug in power cord close door and press power button DO NOT PRESS START 6 You should measure 10 to 15 VDC If 10 to 15 VDC is present control board white wire and gray wire are OK If not follow tes...

Page 39: ...t does not pulse or change Hall sensor has failed and must be replaced IF zero 0 voltage is measured on either test check red blue wires for continuity Repair or replace harness as needed Voltage Testing Hall Sensor from the Main PCB Assembly 7 To measure output signal voltage from the hall sensor carefully move test leads to terminals 1 to 4 blue and gray Slowly rotate motor rotor by hand You sho...

Page 40: ... 2 3 4 BL3 SB SB SB N B K B BN DRAIN PUMP CIRCULATION PUMP BK Object Function Test points Result Each circuits of loads in wiring diagram are all same Two pump motors are used to drain the tub and to circulate the water detergent solution Drain Pump Drain Pump Circulation Pump Circulation Pump Test Points Result 1 to 2 10 20 Ω Test Points Result 1 to 2 18 30 Ω T P For Drain For Circulation 1 2 2 1...

Page 41: ...8 5 INLET VALVE ASSEMBLY 41 ...

Page 42: ...the wash water to the desired temperature selection during certain wash cycles Result Test points Function Wering diagram Each circuits of loads in wiring diagram are all same Wash Heater Wiring diagram Circuit in the MAIN PWB Test Points 1 to 2 12 18 Result 42 ...

Page 43: ...8 7 THERMISTOR ASSEMBLY Circuit in the MAIN PCB Wiring Diagram 43 ...

Page 44: ...At 158 F 70 C At 203 F 95 C At 221 F 105 C Steam generator Thermistor Test Points 1 to 2 Result tolerance 5 39 5 kΩ 26 1 kΩ 12 1 kΩ 8 5 kΩ 3 8 kΩ 2 8 kΩ 2 1 kΩ 1 4 kΩ 1 0 kΩ 0 7 kΩ 0 4 kΩ Remarks At 86 F 30 C At 104 F 40 C At 140 F 60 C At 158 F 70 C At 203 F 95 C At 221 F 105 C At 241 F 116 C At 266 F 130 C At 293 F 145 C At 320 F 160 C At 356 F 180 C 44 ...

Page 45: ...m the cabling 4 Pull out the drawer and unscrew 2 screws 5 Remove one screw 6 Lift the side the control panel assembly and pull it out 7 Unscrew the 8 screws from the control panel assembly 8 Disassemble the display PWB assembly 9 Disconnect the NFC connector 10 Disassemble the NFC PCB from the PCB assembly display TOP PLATE ASSEMBLY CONTROL PANEL ASSEMBLY DRAWER CONTROL PANEL ASSEMBLY DISPLAY PWB...

Page 46: ... PWB ASSEMBLY Disconnect the POWER connector and the pressure switch assembly Remove the protective cover Unscrew 1 screw on the back Remove the main PWB Disconnect the connectors PROTECT COVER 1 2 3 4 5 46 ...

Page 47: ...ble two or three connectors from the noise filter Unscrew a screw from the top bracket Unscrew the clamp nut at the lower part of the dispenser Unscrew 2 screws from the back of the cabinet Disassemble the 4 connectors from the valves Wire Color Blue Housing YL BK White Housing WH BK Blue Housing GY BK Red Housing BL BK 1 2 3 4 DRAWER 1 3 2 4 5 6 1 2 47 ...

Page 48: ...m upper of the cabinet cover Unscrew the screw from the filter cover Put a flat screwdriver or putty knife into the hinge slots at the bottom of the cover and pry it out Unscrew the screw from the lower side of the cabinet cover 1 2 3 4 48 ...

Page 49: ...ly Tilt the cabinet cover Disconnect the door switch connector Disassemble the clamp assembly Disassemble the gasket Lift and separate the cabinet cover NOTE When assembling the cabinet cover connect the door switch connector 5 6 7 8 9 10 11 49 ...

Page 50: ...e Use the 8mm tool Open the door and remove the gasket using the special gasket pliers Unscrew the 2 screws Disassemble the door upward NOTE Reconnect the connector after replacing the door switch assembly 1 3 1 2 2 DOOR DOOR LOCK SWITCH ASSEMBLY 50 ...

Page 51: ...le the pump assembly HEATER Disassemble the cabinet cover Separate 2 connectors from the heater Loosen the nut and pull out the heater CAUTION When assembling the heater insert the heater into the heater clip on the bottom of the tub Tighten the fastening nut so the heater is secure CIRCULATION HOSE PUMP HOSE BELLOWS 1 2 3 1 2 3 51 ...

Page 52: ... Separate the heater from the tub Remove any foreign objects wire coin etc by inserting a long bar in the opening LAMP ASSEMBLY Unscrew 2 screws on the back of the top plate Pull the top plate backward and upward as shown TOP PLATE ASSEMBLY 1 2 3 1 Disconnect the connector 3 2 52 ...

Page 53: ... they can be re used Bolt Rotor DAMPER HINGE DAMPER Disassemble the back cover Remove the bolt Pull out the rotor 1 2 3 Unscrew the 2 screws from the tub bracket Remove the 6 bolts on the stator Unplug the 2 connectors from the stator 1 2 3 Disassemble the damper hinges from the tub and base 1 53 ...

Page 54: ...INET CONTROL PANEL ASSEMB LY A105 A133 A310 A300 A485 A455 A410 A131 A390 A201 A430 A100 A101 A104 A102 F215 F210 A450 A111 A110 A141 A103 A220 A200 M410 A106 F110 Non Skid pads G010 A152 A150 A154 A140 A440 A130 A151 A153 A303 ...

Page 55: ...23 K143 K360 K350 K110 K140 K320 K131 K512 K510 K411 K410 F315 F465 K125 F463 K130 K530 F464 F310 K117 K141 K121 K122 F468 K540 F461 K520 K135 F360 F365 K611 K610 K571 K572 K570 K105 K190 K516 K349 K550 K111 K115 F145 K344 K340 ...

Page 56: ...10 3 DISPENSER ASSEMBLY F300 F462 F225 F432 F130 F120 F441 F430 F329 F170 F220 A275 A276 F227 F226 F323 F322 F321 HOT RED COLD BLUE F160 ...

Page 57: ...RD RD LED OFF Press POWER Button 0 V AC BK to RD RD LED ON Note Ohm check POWER Button Switch from BK to YL Switch is Normally Closed Press Button Switch OPENS 2 3 4 5 6 7 8 9 10 1 11 3 1 2 3 1 3 2 RD1 DISPLAY PWB YL L1 BK RD N RD L1 6 5 4 3 2 1 7 7 6 5 4 3 2 BR RD OR YL GN N L1 L1 HOT VALVE NOTES Test Mode Press Hold SPIN SPEED SOIL LEVEL Press POWER Press START PAUSE to cycle thru tests Componen...

Page 58: ...69 P No MFL68588902 58 ...

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