LG WM3677HW Page 119 Owner'S Manual Download

Page: 119 / 133

The sensor assembly is bolted
to the back of the washer near
the bottom. The tub
(surrounding the drum) is
suspended on springs and
dampers to allow some motion
while the drum rotates.

However, if the load is out of
balance and the tub moves too
far out of place, a tab on the tub
will strike the ball sensor.

p53

Repair – Ball Sensor (Unbalance)

WM3677HW

Summary of Contents for WM3677HW

Page 1: ...COMBO TRAINING WM3677HW Washer Dryer Combo WM3677HW ...

Page 2: ...aundry is exhausted to the outdoors with the airflow The condenser dryer in the COMBO works on a different principal The moisture from the laundry is condensed from the airstream and air is recirculated instead of being exhausted This condensed moisture is then pumped from the combo like wastewater The advantages are that no exhaust vent is required and most ventilation restrictions do not apply t...

Page 3: ...NO vent Air is recirculated over the element and drum Water is used to cool the duct assembly to condense moisture removed from the clothes Drain pump is activated every 30 seconds to remove water Three thermistors control the water valve and Sensor DRY It uses water to remove moisture Drying time is extra long 120 VAC Keynotes Features WM3677HW ...

Page 4: ... used during Sensor Dry Water Inlet Valve is energized approx on 30 seconds off 15 seconds when the sensor temp is near same Valve is energized for longer periods at the beginning of the dry cycle Water COOLS the return duct causing moisture in the air to condense Drain Pump is energized every 30 seconds approx 10 seconds pumping approx 4 oz of water Estimating a 3 hour drying cycle 8 oz every min...

Page 5: ...was accurate at the time of its creation The most recent version of this presentation and its accompanying manual will be available on LG CS Academy In providing this training to our servicers we assume they are reasonably trained and experienced in the repair of electronics and appliances and accept no liability for injury or accident during the course of the repair Introduction WM3677HW ...

Page 6: ... cord is equipped with a grounding lead Do not tamper with the power cord and do not use an extension cord with the COMBO The same precautions that apply to servicing ordinary appliances should be observed Before attempting an installation or any service procedure read and be very familiar with the COMBO s service manual Do not install or store the COMBO in a location where it is exposed to the we...

Page 7: ... liquids may include but are not limited to gasoline kerosene cleaning solvents and cooking oil These can emit explosive vapors or react chemically to cause a fire Never add flammable substances to the COMBO These substances can emit explosive vapors even in the lower heat that a combo produces Introduction WM3677HW ...

Page 8: ... socket that does not meet local requirements or the requirements of the washer DO NOT ground to a gas pipe Before attempting an installation or any service procedure read and be very familiar with the combo s service manual DO NOT install or store the combo in a location where it is exposed to the weather Introduction WM3677HW ...

Page 9: ...the COMBO to prevent small children from being trapped inside Also remove and destroy the unit s power cord At any time that the COMBO is opened for service the servicer should take the opportunity to make sure that the inside of the cabinet is free of dust and lint Introduction WM3677HW ...

Page 10: ...em that has not been used for two weeks or more Hydrogen is explosive Before servicing in such a situation allow the hot water source s to run for several minutes to release any accumulated hydrogen Do not smoke or use an open flame while doing this Introduction WM3677HW ...

Page 11: ...OFF before servicing the COMBO Use a helper to lift or move the COMBO It weighs nearly 200 pounds Follow ESD guidelines for handling parts and servicing Do not remove the ground pin from the plug Introduction WM3677HW ...

Page 12: ...or 25 W Dry Heater 1 200 W Wash Heater 1 000 W Drum Speed Wash 42 rpm Spin 0 1 200 rpm 4 5 145 psi 31 1000 kPa Direct Drive Yes 5 7 27 W x 31 D 51 with door open x 39 H 201 lbs 9 hours 46 rpm 1 200 rpm Yes Energy Consumption Water Pressure Motor COMBO Color Dry Capacity Power Supply Spin Speed Max RPM Water Circulation Wash Capacity Weight Delay Wash Wash Speed Water Heater Temperature Settings Cy...

Page 13: ...p7 Serial Numbers WM3677HW ...

Page 14: ... DIRECT DRIVE MOTOR TILTED DRUM and LARGE DOOR WATER CIRCULATION ROLLER JETS AUTOMATIC LOAD DETECTION BUILT IN HEATER CHILD LOCK p8 Features WM3677HW ...

Page 15: ...To get the best washing performance optimal cycle time is determined by comparing the selected water temperature sensing the current water temperature and the amount of laundry p9 Fuzzy Logic WM3677HW ...

Page 16: ...or cannot be opened When the COMBO is operating When the power failed or the washer is unplugged until the capacitor discharges and releases the lock When the DOOR LOCK light is on When the drum is still turning DOOR LOCKED LAMP The DOOR LOCK lamp lights When the COMBO is operating When the water level sensor frequency is lower than 22 9 kHz When the temperature inside the tub is over 45 C 113 F p...

Page 17: ...he RINSE cycle it runs continuously as soon as the appropriate amount of rinse water has been added This recirculated water enters the drum at the top of the door at a small shower head This spray not only keeps the window and gasket clean it allows the clothes to be soaked with detergent more quickly and can be used to control an oversudsing event p10 Water Circulation WM3677HW ...

Page 18: ...p10 Parts Identification WM3677HW ...

Page 19: ...Main PCB Inlet Valves Water Level Switch Mushroom Valves WM3677HW ...

Page 20: ......

Page 21: ...Heating Element Housing Blower Assembly Element Safetystat Fuselink WM3677HW ...

Page 22: ...RD YL YL BL BL BL Heating Element Fuse link Safety Stat WM3677HW ...

Page 23: ...WM3677HW ...

Page 24: ......

Page 25: ...Air Inlet to Tub Temperature Control Thermistor WM3677HW ...

Page 26: ......

Page 27: ...Blower Assembly Part 4681ER1004A Left Hand Threads WM3677HW ...

Page 28: ...DC Brushless 3 Pole Motor 12 VDC 5 Wire Monitor 8 wires WM3677HW ...

Page 29: ...Blower Heater Duct Assembly WM3677HW ...

Page 30: ...Upper Thermistor Water Inlet ...

Page 31: ... energized approx 80 of the time during the DRY cycle The Drain Pump is energized every 30 seconds for approx 2 3 seconds pumping approx 4 oz 8 oz every minute Water is used to cool duct and remove lint Inlet Hose WM3677HW ...

Page 32: ...5301FR1158J 120 VAC Heating Element WM3677HW ...

Page 33: ...Inlet Valve Assemblies 5220FR2006H HOT 5220FR2008E COLD ...

Page 34: ...Prewash Main Wash Dryer Bleach HOT Inlet Valve Layout Inlet Valve Assemblies 5220FR2006H HOT 5220FR2008E COLD ...

Page 35: ...Ball Sensor Part 4811ER3001A HOLE BALL CASE TR Sensing light DIODE emitting light light BL RD 5VDC Constant BL YL 5VDC Ball NORMAL BL YL 0VDC Ball off seat WM3677HW ...

Page 36: ...BALL SENSOR is located Bottom Rear of Cabinet Note Only in circuit First few minutes of spin Tub Tab Ball Sensor Tab WM3677HW ...

Page 37: ...rests so it blocks the light from the LED above from shining through the hole to the phototransistor below If the sensor is shaken the ball is moved temporarily from its resting place allowing the light to trigger the phototransistor This in turn causes the drum rotation to stop and then attempt to rebalance the load p53 Repair Ball Sensor Unbalance WM3677HW ...

Page 38: ...p11 Back of COMBO ACCESSORIES Parts Identification WM3677HW ...

Page 39: ... bolts AFTER the COMBO has been carried to the installation area Save the bolts in case the COMBO must be moved relocation service etc Use the provided wrench to remove bolts and level the feet p12 Shipping Bolts WM3677HW ...

Page 40: ...Install the COMBO on a firm flat surface Adjust the feet to level the COMBO p12 Installation WM3677HW ...

Page 41: ...ect the water hoses and the drain hose Watch the stripes on the hoses red for hot blue for cold It is critical to proper washing function Secure the drain hose in the pipe of sink p13 Installation WM3677HW ...

Page 42: ...p14 Control Panel WM3677HW ...

Page 43: ...p15 Program Chart Washing WM3677HW ...

Page 44: ... wash detergent main wash detergent fabric softener and bleach Powdered or liquid detergents may be used but softener and bleach must be liquids The dispenser works by using various solenoids to apply water to different compartments The Siphon Box holds the liquid product until it is flooded Then it dispenses the laundry additive into the stream filling the tub p16 17 Dispenser WM3677HW ...

Page 45: ...ents Note the main and pre wash hoses enter at an angle Operating them simultaneously causes water to dispense the softener Water may also pass through the wash compartments but since the detergent has already been dispensed it doesn t matter p16 Dispenser WM3677HW ...

Page 46: ... off to enter TEST MODE 1 Press and hold SPIN SPEED and SOIL LEVEL 2 Press POWER 3 Press START PAUSE to cycle through the test modes See chart on next slide Check the water level frequency Only by Test Mode p18 Test Mode WM3677HW ...

Page 47: ...p18 Test Mode WM3677HW ...

Page 48: ...Use this flow chart to test the COMBO after installation and after any repair or adjustment p19 WM3677HW ...

Page 49: ... Exception PE In a case of PE tE or dE if the error is not resolved within 20 seconds the COMBO will power OFF In the case of any other error code if the error is not resolved within 4 minutes the COMBO will power OFF In the case of FE the COMBO will not power off error code charts on subsequent slides p20 Error Codes WM3677HW ...

Page 50: ...p20 Error Codes WM3677HW ...

Page 51: ...p21 Error Codes WM3677HW ...

Page 52: ...The following slides will aid in diagnosing and repairing COMBOs diagnostic charts on subsequent slides Diagnosis and Check List WM3677HW ...

Page 53: ...Sometimes the customer will make a note of an error code to aid in diagnosing the problem Follow the troubleshooting tree for a quick and easy diagnosis p22 Diagnosis and Check List WM3677HW ...

Page 54: ...p22 Diagnosis and Check List WM3677HW ...

Page 55: ...p23 Diagnosis and Check List WM3677HW ...

Page 56: ...p23 Diagnosis and Check List WM3677HW ...

Page 57: ...p24 Diagnosis and Check List WM3677HW ...

Page 58: ...p24 Diagnosis and Check List WM3677HW ...

Page 59: ...If one of these codes shows up it means a definite service call p24 Diagnosis and Check List WM3677HW ...

Page 60: ...continued on next slide p25 Diagnosis No Power WM3677HW ...

Page 61: ...continued from previous slide p25 Diagnosis No Power WM3677HW ...

Page 62: ...continued on next slide p26 Diagnosis Vibration and Spin Noise WM3677HW ...

Page 63: ...If still unstable adjust the feet to level the COMBO p26 Diagnosis Vibration and Spin Noise WM3677HW ...

Page 64: ...p27 Diagnosis No Water Supply WM3677HW ...

Page 65: ...p27 Diagnosis Detergent Does Not Dispense WM3677HW ...

Page 66: ...p28 Diagnosis Other Products Do Not Dispense WM3677HW ...

Page 67: ...p28 Diagnosis Abnormal Sound or Noise WM3677HW ...

Page 68: ...p29 Diagnosis Heating w out Water WM3677HW ...

Page 69: ...p29 Diagnosis Drain Malfunction WM3677HW ...

Page 70: ...p30 Diagnosis Wash Heater Malfunction WM3677HW ...

Page 71: ...p30 Diagnosis Overheating Water WM3677HW ...

Page 72: ...continued on next slide p31 Diagnosis No Circulation WM3677HW ...

Page 73: ...p31 Diagnosis No Circulation WM3677HW ...

Page 74: ...p32 Diagnosis Spin Malfunction WM3677HW ...

Page 75: ...p33 Diagnosis dE Error Code WM3677HW ...

Page 76: ...p33 Diagnosis dHE Error Code WM3677HW ...

Page 77: ...p34 Diagnosis Dryer Fan Malfunction WM3677HW ...

Page 78: ...p34 Diagnosis Dryer Heater Malfunction WM3677HW ...

Page 79: ...necessary to perform testing Some components may have up to 300 volts present Drain the water from the COMBO if necessary to avoid spillage during a repair Use a shallow pan and the drain hose on the front of the machine Observe ESD precautions when handling electronic components Repair WM3677HW ...

Page 80: ...p plate backward and lift it as shown 3 Disconnect the Display PWB connectors 3 connectors 4 Remove the dispenser drawer 5 Remove the two screws behind the dispenser drawer 6 Lift off the left side of the Control Panel and pull it out p35 Repair Control Panel WM3677HW ...

Page 81: ...7 Remove the nine screws that secure the PWB 8 Remove the PWB 9 Reassembly is the reverse of these steps p35 Repair Control Panel WM3677HW ...

Page 82: ...SWITCH assembly Remove the protective cover by lifting the plastic clips around the top and sides 2 Disconnect all the connectors Note that they are all different shapes and colors to prevent any mistakes upon replacement p36 Repair Main PWB WM3677HW ...

Page 83: ...4 Remove the screw on the back 5 Remove the MAIN PWB from the COMBO Slide it to the right and then lift 6 Reassembly is the reverse of these steps p36 Repair Main PWB WM3677HW ...

Page 84: ...d the large hose on the back of the dispenser 5 Leave the small feed hoses on the dispenser 1 Remove the top plate 2 Remove the dispenser 3 Remove the two screws from the front of the dispenser p37 Repair Dispenser WM3677HW ...

Page 85: ...secure the cold water valve assembly 8 Reassembly is the reverse of these steps Valve Assembly Wire Connector Chart Conn Wire 1 BLUE Yellow and Black dryer water cold 2 WHITE White and Black main wash cold 3 BLUE Gray and Black pre wash cold 4 RED Blue and Black hot input 5 WHITE Orange and Black bleach cold p37 Repair Dispenser WM3677HW ...

Page 86: ...e power cord 3 Remove the screw and ring connector for the ground Replace the screw and any wires other than the ground for the noise filter 4 Remove the screw securing the noise filter to the frame of the COMBO 5 Replacement is the reverse of these steps p38 Repair Noise Filter WM3677HW ...

Page 87: ...rom the top edge of the front cabinet cover 2 Remove the screw behind the filter cover 3 Use a putty knife or a screwdriver on both sides one at a time of the filter cover and pull it out p39 Repair Front Cabinet Cover WM3677HW ...

Page 88: ...emove the screw that was hidden by the filter cover 5 Open the COMBO door 6 Use the special gasket pliers part 383EER4001A to remove the gasket clamp spring assembly p39 Repair Front Cabinet Cover WM3677HW ...

Page 89: ...t cover 8 Disconnect the door switch connector Don t forget it when you put the cover back on 9 Lift the cabinet cover front off and set it aside where it will not fall or be damaged p40 Repair Front Cabinet Cover WM3677HW ...

Page 90: ...10 Remove the gasket clamp on the tub side 11 Remove the gasket p40 Repair Front Cabinet Cover WM3677HW ...

Page 91: ...crews from the hinge cover 3 Put a flat screwdriver into the hinge opening and gently pry off the hinge cover 4 Remove the screw from the lower hinge pin 5 Lift the door off the hinge BE CAREFUL The door is heavy p41 Repair Door WM3677HW ...

Page 92: ...e special pliers remove the gasket clamp 3 Remove the screws 4 Pull the switch out and disconnect the wiring harness NOTE Be sure you reconnect the wires when you replace the switch p41 Repair Door Lock Switch Assembly WM3677HW ...

Page 93: ...The use of direct current allows the MICOM to control both the speed and the direction of rotation There are no brushes to wear away as in a conventional electric motor Unlike a more traditional brushless motor the Direct Drive s rotor surrounds the stator rather than being attached to it A Hall sensor reports the motor s speed to the MICOM see chart next slide p42 Repair Motor WM3677HW ...

Page 94: ...p42 Repair Motor WM3677HW ...

Page 95: ...y given time A Hall Effect sensor is mounted on the stator It counts the poles of the magnets as the rotor turns to feedback the information to the controller The motor controller can determine the direction and speed of rotation by adjusting the polarity and amplitude of the power applied to the stator see picture next slide p42 Repair Motor WM3677HW ...

Page 96: ...d and fits snugly on the drum s shaft When replacing the rotor you will probably need a helper to hold the drum in place while you push the rotor onto the shaft Otherwise the drum may move forward far enough to make it difficult to replace the bolt The helper can also keep the drum from turning while you torque the bolt Repair Motor WM3677HW ...

Page 97: ...CONNECTOR FOR HALL EFFECT SENSOR Check here before disassembling the motor p43 Repair Motor WM3677HW ...

Page 98: ...nter of the rotor 3 Pull the rotor off the shaft You may have to wiggle it off The shaft is splined 4 Remove the two screws from the tub bracket 5 Remove the six bolts on the stator 10mm 6 Remove the two electrical connectors on the stator p44 Repair Motor WM3677HW ...

Page 99: ... Use special tool 383EER4003A 1 Remove the damper hinge pins A special tool is available for this Using a 5 8 deep well socket makes this easier by holding down the locking tab so the pin slides out easily 2 Replace the damper with a new part Do not reuse a damper that has been disassembled p44 Repair Motor WM3677HW ...

Page 100: ...nt has been removed it is easy to remove the tub Remove the counterweights first to make this job easier If you remove the counterweights the motor will make the tub vary back heavy It should probably be removed with the weights Otherwise leave them both in place unless you must disassemble the tub Regardless most of this procedure will require a helper Repair Tub Removal and Repair WM3677HW ...

Page 101: ... where they will not fall and break or cause injury 3 Disconnect the wire lead to the thermistor 4 Disconnect the wires on the heating element 5 Remove the center bolt securing the ground and the element 6 Pull the element out carefully p45 Repair Tub Removal and Repair WM3677HW ...

Page 102: ...or This is much easier if there is an assistant available to hold the drum still on the inside while loosening the bolt Extreme torque is not required when replacing the bolt instead use a drop of Loctite M10 1 50X75 Long Bolt Use extreme caution This part holds the motor s permanent magnets p46 Repair Tub Removal and Repair WM3677HW ...

Page 103: ...ctions and grounding screw 4 Remove the 6 bolts that hold the windings in place 5 Disconnect the small hose that attaches to the water level sensor 6 Disconnect the dryer duct water input hose p46 Repair Tub Removal and Repair WM3677HW ...

Page 104: ...nnect the recirculating hose at the top of the door gasket 9 Disconnect the air vent hose Be especially careful of the ball check valve It must be replaced correctly to function properly 10 Disconnect the vacuum break p46 Repair Tub Removal and Repair WM3677HW ...

Page 105: ... where the dryer duct connects to the gasket Separate the gasket and duct for when the tub comes out This will allow the dryer assembly to remain in place when the drum comes out p47 Repair Tub Removal and Repair WM3677HW ...

Page 106: ...S Separated dampers must be replaced Press in the tab on the small end and use the pliers to push the pin out It is easiest to remove the bottom pin first After removing the drum the pin on the other end is easy to reach if it must be removed at all p47 Repair Tub Removal and Repair WM3677HW ...

Page 107: ...ring clip on each side where the spring supports the tub 15 Lift the springs out of the holders and take the tub out through the front of the COMBO This may require a helper p48 Repair Tub Removal and Repair WM3677HW ...

Page 108: ...a screwdriver or other sharp instrument to pry the halves apart The bearing is visible in this photo 17 Do not disturb the seal gasket between the tub halves unless it requires replacement p48 Cavities in tub molding can build up detergent residue Odors from excessive soap Repair Tub Removal and Repair WM3677HW ...

Page 109: ...wo bolts from the end on the spider of the drum Then remove the screw on the outside of the drum Squeeze the sides of the baffle slightly to release the positioning tabs p49 Repair Tub Removal and Repair WM3677HW ...

Page 110: ...part Lift it out and remove the six glass roller balls The roller balls help turn the clothes over and the baffle fills up with water as the drum rotates allowing it to shower that water out as it continues to rotate 20 As always reassembly is basically the reverse of these steps p49 Repair Tub Removal and Repair WM3677HW ...

Page 111: ...y increases e g A low water level may read 25 5kHz while a high water level may read 21 4 kHz These readings are approximate washers in the field may vary slightly from these figures To read the frequency while the COMBO is running press and hold the SPIN SPEED and SOIL LEVEL buttons The number on the display should be divided by 10 to obtain the frequency reading in kHz A display of 254 would ind...

Page 112: ...p50 Repair Water Level Switch WM3677HW ...

Page 113: ...he tub onto the laundry creating a better saturation of detergent and better rinsing it keeps the window clean and it allows the customer to see water in the tub The filter are between the pumps is not a lint filter in the traditional since It serves to trap larger objects keys coins buttons etc that may find their way into the washer and protects the pumps from physical damage see diagram next pa...

Page 114: ...hose the bellows and the circulation hose from the pump body 3 Remove the two screws on the front plate 4 Push the pump backward and lift it out You can replace either pump without affecting the other one See drawing p51 Repair Pump WM3677HW ...

Page 115: ...1 Remove the front cover 2 Separate the connectors from the heater element 3 Remove the nut also the ground connection and pull the heater out p52 Repair Water Heater WM3677HW ...

Page 116: ...1 Remove the front cover 2 Disconnect the thermistor at the white connector 3 Pull the thermistor out by the bracket p52 Repair Thermistor WM3677HW ...

Page 117: ...1 Remove the front cover 2 Remove the heater from the tub 3 Use a long bar or a wire to fish out anything that could be in the space there p52 Repair Removal of Foreign Objects WM3677HW ...

Page 118: ...rests so it blocks the light from the LED above from shining through the hole to the phototransistor below If the sensor is shaken the ball is moved temporarily from its resting place allowing the light to trigger the phototransistor This in turn causes the drum rotation to stop and then attempt to rebalance the load p53 Repair Ball Sensor Unbalance WM3677HW ...

Page 119: ... The tub surrounding the drum is suspended on springs and dampers to allow some motion while the drum rotates However if the load is out of balance and the tub moves too far out of place a tab on the tub will strike the ball sensor p53 Repair Ball Sensor Unbalance WM3677HW ...

Page 120: ...emove the four screws and the back cover 2 Remove the single screw that secures the sensor bottom right as you face the back of the COMBO 3 Separate the connector p54 Repair Ball Sensor Unbalance WM3677HW ...

Page 121: ...rom the laundry The warm moist air is directed through the condensing duct which is cooled by a stream of cold water This difference in temperature causes the moisture to precipitate in the condenser where it and the cooling water are exhausted by the drain pump The air now dry is passed over the warming element and through the laundry again as the process repeats itself Because the air is recycle...

Page 122: ...lectrical connections from the dryer duct 3 Remove the two screws that secure the dryer fan housing to the back of the cabinet 4 Lift the dryer fan housing and duct from the back end to clear the cabinet The studs will pull free and you can remove the heater assembly Dryer Repair WM3677HW ...

Page 123: ...ser duct to the back cabinet If you haven t drained the water from the tub this would be a good time to do it 6 Disconnect the condenser boot on the tub end This will aid disassembly and reassembly because it is easier to reach Dryer Repair WM3677HW ...

Page 124: ...p56 7 Release the clamp and remove the dryer water supply hose at the solenoid end Dryer Repair WM3677HW ...

Page 125: ...e hole in the duct with the smaller side of the gasket facing the duct Then insert the hose and rotate it 90 to lock it into place 9 Dryer reassembly is the reverse of these steps Test and diagnostic procedures are available on pages 33 34 slides 55 57 the training manual Dryer Repair WM3677HW ...

Page 126: ...ed cycle and sensor input The main board is potted into a plastic case to protect it from vibration and water It cannot be repaired and must be replaced as an assembly The connectors on the main board are color coded See Wiring Diagram next slide and are unique It is not possible to cross the connectors They are identifiable by pin count conductor count and shape as shown on the diagram Two of the...

Page 127: ...p57 Main Board WM3677HW ...

Page 128: ...p58 Wiring Diagram WM3677HW ...

Page 129: ...CABINET and CONTROLS p59 Exploded View WM3677HW ...

Page 130: ...DRUM and RELATED PARTS p60 Exploded View WM3677HW ...

Page 131: ...DISPENSER p61 Exploded View WM3677HW ...

Page 132: ...DRYER COMPONENTS p62 Exploded View WM3677HW ...

Page 133: ...30 5214ER4001C HOSE INLET M210 6931FR3108A THERMOSTAT ASSEMBLY 383EER4001A GASKET PLIER SPECIAL TOOL 393EER4003A DAMPER PLIER SPECIAL TOOL 383EER4004A GASKET PLIER SPECIAL TOOL Full Parts List is in the SERVICE MANUAL and the TRAINING MANUAL p63 66 Parts List WM3677HW Outer Inner ...

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