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LG WM2050C Series, Service Manual

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LG WM2050C Series Service Manual Download Page 35

3

4

9-1. FILTER ASSEMBLY (LINE FILTER)

9. COMPONENT TESTING INFORMATION

When Resistance (Ohm) checking the Component, be sure to turn the power off,
and do voltage discharge sufficiently.

Wiring
diagram

Circuit in the MAIN PWB / Wiring Diagram

Vac

MAIN PWB
ASSEMBLY

WH

RD

LI

L2

RI

CI

C2

C3

1 1

2 2

3 3

3 3

2 2

1 1

Test
points 

and 

Result

Test Points

Result

WH (1) to RD (3)

WH (3) to RD (1)

0 

Ω

0 

Ω

(1) (3)

(3)

(1)

RD

WH

WARNING

Summary of Contents for WM2050C Series

Page 1: ...HING MACHINE SERVICE MANUAL READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT MODEL WM2050C CAUTION Website http www LGEservice com E mail http www LGEservice com techsup html ...

Page 2: ...101 MAY 2009 PRINTED IN KOREA P No MFL30599149 ...

Page 3: ...CK THE WATER LEVEL FREQUENCY 19 8 TROUBLESHOOTING 20 8 1 SAFETY CAUTION 20 8 2 ERROR MODE SUMMARY 20 8 3 TROUBLESHOOTING SUMMARY 22 8 4 TROUBLESHOOTING WITH ERROR 23 8 5 TROUBLESHOOTING ELSE 29 9 COMPONENT TESTING INFORMATION 34 9 1 FILTER ASSEMBLY LINE FILTER 34 9 2 DOOR LOOK SWITCH ASSEMBLY 35 9 3 STATOR ASSEMBLY 37 9 4 PUMP MOTOR ASSEMBLY 40 9 5 INLET VALVE ASSEMBLY 41 9 6 THERMISTOR ASSEMBLY 4...

Page 4: ...inse Water Plus Stain Cycle WATER CIRCULATION _ OPERATIONAL WATER PRESSURE 14 5 116 psi 100 800 kPa CONTROL TYPE Electronic WASH CAPACITY cu ft 3 50 4 0IEC DIMENSIONS 27 W X 293 4 D X 38 11 16 H 50 13 16 D door open DELAY WASH up to 19 hours DOOR SWITCH TYPE PTC Solenoid WATER LEVEL 10 steps by sensor LAUNDRY LOAD SENSING Incorporated ERROR DIAGNOSIS Incorporated AUTO POWER OFF Incorporated CHILD ...

Page 5: ...an be washed Direct Drive System The advanced Brushless DC motor directly drives the drum without belt and pulley Tilted Drum and Extra Large Door Opening Tilted drum and extra large opening make it possible to load and unload clothing more easily Automatic Wash Load Detection Automatically detects the load and optimizes the washing time Child Lock The Child lock prevents children from pressing an...

Page 6: ...m then proceeds Spinning does not proceed until the water in the tub drains to a certain level 2 4 DOOR CONTROL The door can be opened by pulling the door handle whenever washer is not in operation When the cycle is completed the DOOR LOCKED light will turn off If a power failure has occurred while in operation the door will unlock after 5 minutes Clicking sounds can be heard when the door is lock...

Page 7: ...e motor is in the process of intertial rotating through the operation is paused 2 6 CHILD LOCK Use this option to prevent unwanted use of the washer Press and hold PRE WASH button for 3 seconds to lock unlock control When child lock is set CHILD LOCK lights and all buttons are disabled except the Power button You can lock the controls of the wash while washing ...

Page 8: ...or Seal Hose retainer Hot Cold 1 each Hose Wrench for removing shipping bolts and leveling the washer Tie strap to secure drain hose to standpipe inlet hose or laundry tub Cap 4 each to cover the holes created after removing the shipping bolts ...

Page 9: ... appliance to see whether it functions correctly STANDARD INSTALLATION The appliance should be installed as follows 1 2 3 4 5 6 6 REMOVE THE SHIPPING BOLTS Remove the 4 shipping bolts with the supplied wrench Do first lower side to remove easily Turn the leveling feet to adjust the appliance Turn clockwise to raise counterclockwise to lower Keep the shipping bolts and spanner for future use Insert...

Page 10: ...rely to prevent leaks CONNECT THE DRAIN HOSE CONNECT POWER PLUG The end of the drain hose should be placed less than 96 from the floor Connect the power plug to the wall outlet Avoid connecting several electric devices as doing so may cause a fire Make sure that the hose is not twisted Avoid submerging the end of the hose ...

Page 11: ...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 8 Press the START PAUSE button 9 Water removal If SERVICE is needed during check remove the remaining water by pulling out the hose cap 2 Press the POW...

Page 12: ...11 5 OPERATION 5 1 CONTROL PANEL FEATURES WM2050C 8 ...

Page 13: ...he washer is locked The door can be unlocked by pressing the Start Pause button to stop the washer 12 E ES ST T T TI IM ME ER RE EM MA AI IN NI IN NG G This display shows a the estimated time remaining in the cycle when operation b an error code when an error has been detected C CY YC CL LE ES SE EL LE EC CT TO OR R Rotate the cycle selector knob to select the cycle designed for different types of...

Page 14: ...ns and recommended fabric types for each cycle Drain Spin Only DRAIN SPIN Ta p Cold Ta p Cold Ta p Cold Ta p Cold Ta p Cold Ta p Cold NOTE To protect your garments not every wash rinse temperature spin speed soil level or option is available with every cycle ...

Page 15: ... the wash tub over time and can lead to a mildew or musty smell The TUB CLEAN cycle is specially designed to remove this buildup Press and hold the EXTRA RINSE button for 3 seconds to activate this cycle The display will show a message to add liquid bleach to the dispenser After the cycle has ended open the door and allow the drum interior to dry completely NOTE Do NOT use this cycle with clothes ...

Page 16: ...o the laundry load water temperature and other factors 5 Drainage A pump motor drains the water from the drum After sensing drained water amount by water level frequency spin starts When a course is selected stay cooling process is performed to decrease the water temperature gradually to prevent laundry from being damaged and for safety reasons 6 Untangling Sensing eccent ricity It balances laundr...

Page 17: ...supply Water supply for rinse process E Rinse Rinsing process F 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 G Disentangling The same as item 9 H Intermittent spin The same as item A I Main spin1 The same as item B J Main spin2 At the end of a main spin the ...

Page 18: ...2 1 2 1 2 1 5 6 1 2 3 4 5 6 1 2 3 4 1 3 4 1 2 2 3 4 5 6 1 3 4 1 2 2 3 4 NA NA NA RD BK BL NA BL YL 6 7 2 3 4 5 1 6 7 2 3 4 5 1 6 7 2 3 4 5 1 6 7 2 3 4 5 1 6 2 3 4 5 1 7 2 3 1 2 3 4 4 3 2 1 3 2 1 1 RD NA 2 3 4 5 6 7 8 9 10 11 1 NA NA NA BL MAIN PWB HOT VALVE PRE WASH MAIN WASH BLEACH DISPLAY PWB DISPLAY PWB ...

Page 19: ...18 52 52 55 55 45 20 ...

Page 20: ...h the test modes 7 3 HOW TO CHECK THE WATER LEVEL FREQUENCY Press the CUSTOM and PRE WASH buttons simultaneously None 1 time 2 times 3 times 4 times 5 times 6 times 7 times 8 times 9 times 10 times 11 times Turns on all lamps and locks the door Tumble clockwise Low speed Spin High speed Spin Inlet valve for prewash turns on Inlet valve for main wash turns on Inlet valve for hot water turns on Inle...

Page 21: ...preset water level within 25 minutes The load is too small The appliance is tilted Laundry is gathered to one side Non distributable things are put into the drum Door not all the way closed Loose electrical connections at Door switch and PWB Assembly The DOOR SWITCH ASSEMBLY is out of order Not fully drained within 10 minutes The SENSOR SWITCH ASSEMBLY is out of order The THERMISTOR is out order W...

Page 22: ... pin male white in the MOTOR HARNESS and 4 pin female white connector in the MAIN PWB ASSEMBLY is bad or unstable The MOTOR HARNESS between the STATOR ASSEMBLY and MAIN PWB ASSEMBLY is cut open circuited The hall sensor is out of order defective EEPROM is out of order Displayed only when the START PAUSE button is first pressed in the Load Test Mode After the power supply is stopped while washing m...

Page 23: ... k 2 1 8 Ω c d V 5 1 0 1 c d V 0 1 c d V 0 1 k r a m e R V t u p n I e g a t l o l a n g i S g n i s l u P l a n g i S g n i s l u P 2 n i P 1 n i P 3 n i P 1 n i P 4 n i P 1 n i P 4 n i P 2 n i P 4 n i P 3 n i P t l u s e R T s t n i o P t s e 0 0 5 1 0 0 7 Ω 0 9 0 6 Ω y t i n i f n I c a V 0 2 1 k r a m e R 7 7 t A 5 2 7 7 t A 5 2 V t u p n I e g a t l o 4 n i P 2 n i P 4 n i P 3 n i P 5 n i P 4...

Page 24: ... Is the voltage of the inlet valve connector 120 V AC Check the all terminal of INLET VALVE ASSEMBLY while the power is on Replace the INLET VALVE ASSEMBLY No Yes Is the connector connected to MAIN PWB assembly disconnected or dis assembled NA4 BL3 BL4 Reconnect or repair the connector No Yes Yes Is Electrical connection correct Refer to 9 5 wiring diagram Replace the MAIN HARNESS No No After chec...

Page 25: ... Assurance TPA of connector check as follows And if you finish to measure the valve You should put TPA as original form Pump running 120V 5 Stopped Motor Pump 0 1V Method 1 Press the Power button while the SPIN SPEED button and WASH RINSES button is pressed simultaneously 2 Press Start Pause button 1 time Pump slow speed running 2 times Pump mid speed running 3 times Pump high speed running 4 time...

Page 26: ...D4 Is rotor magnet cracked Hall sensor NA1 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...

Page 27: ...t the cycle Replace 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 ...

Page 28: ...ly In the DRUM assembly Yes Is the washing machine installed at an angle Adjust the height of washing machine to be kept horizontally Yes No Is displayed Yes When you press both CUSTOM button and PRE WASH button simultaneously is the water level frequency over 21 3kHz Refer to 7 3 Check the AIR CHAMBER and the tube clogged No Does the inlet valve work when the power is not applied Replace the INLE...

Page 29: ...ed or disassembled Reconnect 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 ...

Page 30: ...he 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 DISPL...

Page 31: ...WB Display PWB disconnected or disassembled Reconnect or Repair the connector Yes Is the display PCB broken check the buzzer sound and LED light while push the button Replace the DISPLAY PWB ASSEMBLY Yes Is the button of panel stuck Repair the button Yes No No ...

Page 32: ...ce part rubber inside of drum and start QC test mode and run in high spin Refer to section 7 2 When the machine is spinning in high speed verify that it is stable If you do not have the unbalance part put 4 5 to 6 5 lbs 2 to 3 kg of clothing Once loaded press power Rinse Spin and the start pause button in sequence When the machine is spinning in high speed verify that it is stable If it is not sta...

Page 33: ...e dispenser Put the detergent in the correct place YES YES YES YES NO NO NO Is water supplied Is the detergent caked or hardened Are receptacles correctly connected to the terminals of the INLET VALVE ASSEMBLY Has detergent been put in the correct compartment of the dispenser 7 6 5 ...

Page 34: ...tive Then check stator Replace if necessary Check rotor for broken magnets Replace rotor if necessary YES NO YES YES YES YES YES NO NO NO Is water supplied Are the plugs correctly connected to the terminals of the INLET VALVE ASSEMBLY Is liquid detergent softener bleach put in the correct compartment of the drawer Is the liquid detergent softener bleach cap clogged Is the motor bolt loosened Is th...

Page 35: ... Component be sure to turn the power off and do voltage discharge sufficiently Wiring diagram Circuit in the MAIN PWB Wiring Diagram Vac MAIN PWB ASSEMBLY WH RD LI L2 RI CI C2 C3 1 1 2 2 3 3 3 3 2 2 1 1 Test points and Result Test Points Result WH 1 to RD 3 WH 3 to RD 1 0 Ω 0 Ω 1 3 3 1 RD WH WARNING ...

Page 36: ...ough 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...

Page 37: ...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 2 3 4 5 ...

Page 38: ... 5 2 3 4 1 2 3 4 Hb Function Test points Windings Result Windings 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 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 t...

Page 39: ...o the 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 ...

Page 40: ...s but 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...

Page 41: ... Driving circuit MAIN PWB BL4 1 2 3 1 2 3 3 2 1 3 2 1 1 2 3 4 1 2 3 4 BL3 SB BK BN DRAIN PUMP 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 Test Points Result 1 to 2 10 20 Ω T P For Drain 1 2 1 2 ...

Page 42: ... will energize the hot or cold water valve solenoids to meet the selected water temperature After pull out the connector of defective valve check the resistance Test points 1 2 Result 0 8 1 2 kΩ Wiring Diagram MAIN WASH PRE WASH BLEACH HOT VALVE 1 2 1 2 1 2 1 2 RD BL BL NA WH NA4 GY YL BL BL4 BL3 4 3 2 1 1 2 3 1 2 3 4 3 2 1 4 3 2 1 4 3 2 1 COMMON BK MIAN PWB INLET VALVE Each circuits of loads in w...

Page 43: ... R R C C C C 2 3 4 5 6 Function Test points Result The thermistor temperature sensor is used to monitor water temperature in the tub or Steam Generator Wash Thermistor 1 2 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 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 ...

Page 44: ... and repairing the parts 2 Pull the top plate backward and upward as shown 4 Pull out the drawer and unscrew 2 screws 5 Remove one screw 8 Disassemble the Display PWB Assembly 6 Lift the side the control panel assembly and pull it out 7 Unscrew the 8 screws from the control panel assembly 3 Disconnect the Display PWB assembly connector from trans cable ...

Page 45: ...44 MAIN PWB ASSEMBLY 1 Disconnect the POWER connector and SENSOR SWITCH ASSEMBLY 2 Remove the Protective cover 3 Disconnect the connectors 4 Unscrew 1 screw on the back 5 Remove the Main PWB ...

Page 46: ...assembly 2 Pull out the drawer 1 Disassemble two or three connectors from the NOISE FILTER 2 Unscrew a screw from the TOP BRACKET 4 Unscrew the Clamp nut at the lower part of the dispenser 5 Disassemble the 4 connectors from the valves 6 Unscrew 2 screws from the back of the cabinet 3 Push out the DISPENSER ASSEMBLY after unscrewing 2 screws 1 2 3 4 ...

Page 47: ...ews from upper of the canbinet cover 2 Unscrew the screw from filter cover 3 Put a flat screwdriver or putty knife into the hinge slots at the bottom of the cover and pry it out 4 Unscrew the screw from the lower side of the cabinet cover ...

Page 48: ... assembly 7 Tilt the cabinet cover 8 Disconnect the door switch connector 9 Lift and separate the cabinet cover 10 Disassemble the clamp assembly 11 Disassemble the gasket NOTE When assembling the CABINET COVER connect the door switch connector ...

Page 49: ...tor 1 Unscrew the 2 screws from the tub bracket 2 Remove the 6 bolts on the stator 3 Unplug the 2 connectors from the stator 1 Disassemble the damper hinges from the tub and base NOTE If you pull the dampers apart the must be replaced If you do not separate them they can be re used ...

Page 50: ...00 A200 A155 A440 A430 A100 A101 A133 A130 A151 A153 A131 A201 A220 F110 F215 F210 A105 A106 A104 A102 A103 A390 Printed materials Description Owner s Manual Energy Label Loc No Service Manual Wiring Diagram Quick Start Guides Installation Sheet G001 G002 G004 G005 G006 G007 The following parts are not illustrated A141 ...

Page 51: ...Y K344 K346 K123 K111 K140 K110 K410 K411 F140 K351 K350 K360 K143 K340 K510 K342 K131 F315 F465 K125 F466 F467 K520 F461 K540 K550 F463 K130 F464 K121 K122 F145 K105 F468 K135 K530 K570 K571 K572 F310 K115 K141 K611 K610 K117 ...

Page 52: ...51 11 3 DISPENSER ASSEMBLY HOT RED COLD BLUE F300 F227 F220 F225 F430 F170 F160 F441 F120 F130 F432 A275 A276 F226 F323 F462 F322 F321 ...

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