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LG F12A8QDSA Series, Service Manual

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LG F12A8QDSA Series Service Manual Download Page 1

WASHING MACHINE

SERVICE MANUAL

CAUTION

READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS
CORRECTLY BEFORE OFFERING SERVICE.

BEFORE SERVICING THE WASHING MACHINE, UNPLUG THE POWER
CORD TO AVOID THE RISK OF AN ELECTRIC SHOCK. 

WHEN  SERVICING  INTERNAL  PARTS,  USE  ONLY  SERVICE  PARTS
SUPPLIED FROM LG. 

AFTER SERVICING THE ELECTRIC WIRE, INSURE THAT INSULATION

TAPE IS APPLIED TO PREVENT AN ELECTRICAL SHORT.

MODEL : F14A8TDSA(1~9) / F12A8TDSA(1~9)

F14A8QDSA(1~9) / F12A8QDSA(1~9)

website : 

http://biz.lgservice.com

e-mail : http://LGEservice.com/techsup.html 

Summary of Contents for F12A8QDSA Series

Page 1: ...UG THE POWER CORD TO AVOID THE RISK OF AN ELECTRIC SHOCK WHEN SERVICING INTERNAL PARTS USE ONLY SERVICE PARTS SUPPLIED FROM LG AFTER SERVICING THE ELECTRIC WIRE INSURE THAT INSULATION TAPE IS APPLIED TO PREVENT AN ELECTRICAL SHORT MODEL F14A8TDSA 1 9 F12A8TDSA 1 9 F14A8QDSA 1 9 F12A8QDSA 1 9 website http biz lgservice com e mail http LGEservice com techsup html ...

Page 2: ...UBLESHOOTING WITH ERROR 23 IE Water Inlet Error 23 UE Unbalanced Error 24 OE Water Outlet Error 25 FE Over Flow Error 27 PE Pressure Sensor S W Error 28 dE Door open Error 29 tE Thermistor Heating Error 30 LE Motor Lock Error 31 8 TROUBLESHOOTING OTHER 33 No power 33 Vibration Noise during spin 34 Detergent Softener does not flow in 35 Water Leak 36 9 PART INSPECTION 38 9 1 FILTER ASSEMBLY LINE FI...

Page 3: ... CHILD LOCK AUTO RESTART TIME SAVE ELECTRICITY CONSUMPTION WASHING SPIN DRAIN MOTOR STEAM HEATER WASH HEATER REVOLUTION SPEED WASH SPIN F14A8 DSA 1 9 No Spin 400 800 1000 1400 F12A8 DSA 1 9 No Spin 400 800 1000 1200 46 rpm 100 1000 kPa 1 0 kgf cm 2 10 0 kgf cm 2 Electronic Refer to the Rating Label 600 mm W x 590 mm D x 850 mm H Cotton Cotton Eco Mix Easy Care Duvet Allergy Care Refresh Sports Wea...

Page 4: ...ature and then determines the optimum water level and washing time to minimize energy and water consumption Low noise speed control system By sensing the amount of load and balance it evenly distributes load to minimize the spinning noise level Inverter Direct Drive system The advance Brushless DC motor directly drives the drum without belt and pulley 6 motion Washer is able to perform various dru...

Page 5: ...water level in the tub Water supply is stopped when the water level reach the preset level then washing program proceeds Spinning does not proceed until the water in the tub reduces to a certain level water temperature washing time rinse time the best washing performance spin rhythm time laundry amount FUZZY LOGIC selected washing temperature SENSING EFFECT PROCESSING DETERMINATION 2 4 THE DOOR CA...

Page 6: ...ransit Bolts Control Panel Power Plug Drain Pump Filter Drain Plug Lower Cover Cap If the supply cord is damaged it must be replaced by the manufacturer or its authorized service technician in order to avoid a hazard ACCESSORIES Inlet hose 1EA Option Hot Cold 2EA Spanner ...

Page 7: ...jects under the feet Clean the floor there should be no foreign objects under the feet If the unit has foreign objects underneath the feet this will prevent the unit from being leveled properly and will cause vibrations and slipping Remove any foreign objects if any from underneath the machine and level unit properly See below for examples of foreign objects 1 Open the box and check appliance cond...

Page 8: ... upper connector up till the rubber packing is in tight contact with the tap Then tighten the 4 screws 3 Connect the water supply hose to the middle connector pushing the plate down In case the diameter of the tap is large remove the guide plate Turn the middle connector not to have water leaked Make sure that the rubber seal is inside the hose connector To separate the water supply hose from the ...

Page 9: ...or could be coming from the standpipe This odor can come up the drain hose and into the unit Pour a cup or two of bleach or vinegar down the home drain and let it sit for 24 hours before running another cycle This will help eliminate odor from the home drain If a cycle is started too soon after doing this it will not help the issue Connect the power plug to the wall outlet Avoid connecting several...

Page 10: ...p between floor and foot And only use adjustment rubber when difference at the leg adjustment is more than 10mm Place your right hand on the back right corner and your left hand on the front left corner of the unit then attempt to rock the unit from corner to corner Then move your right hand to the front right side and your left hand to the back left corner and attempt to rock the unit from corner...

Page 11: ...nterclockwise 5 Check automatic reverse turn 4 Check the water supply Check if water is supplied through the detergent dispenser 7 Check the drain and spin functions Turn power off and then power on Select the spin rpm Press the START PAUSE button Check the spin and drain functions Turn power off and then power on Listen for a click to determine if the door is unlocking 8 Turn power off and open t...

Page 12: ...13 Cy cle Selector Additional programs Start Pause Option Button Power 5 OPERATION ...

Page 13: ...and holding the Temp and Rinse button This display shows a the estimated time remaining in the cycle when operating EST Time remaining Beep on off In case of abormal operation error indications are displayed see troubleshooting simultaneouly Tub Clean course can be set by pressing and holding Rinse button simultaneously Tub Clean is a special cycle to clean the inside of the washer Tub Clean Selec...

Page 14: ...17 6 WIRING DIAGRAM PCB LAYOUT Wiring Diagram 1 3 Full Wiring Diagram 1 3 2 3 3 3 ...

Page 15: ...18 0 01 2 3 4 3 4 3 3 3 3 5 5 Option Wiring Diagram 2 3 ...

Page 16: ...19 n 0 Wiring Diagram 3 3 ...

Page 17: ...20 PCB Layout Main Earth Wire Connector ...

Page 18: ...on repeatedly to cycle through the test modes F1495BDS 1 9 F1495BD 1 9 1 2 3 4 5 6 Display Status Remark Check Point Number 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Turns on all light 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 Inlet valve for steam turns on Tumble counterclockwi...

Page 19: ...55 is displayed the water level frequency is 25 5kHz 255 X 0 1 Data View Type In case of 040 Touch the Temp and Pre Wash button simultaneously If the knob is turned the data view type is changed from 40 to 49 Touch the Temp and Pre Wash button simultaneously If the knob is turned the data view type is changed from 40 to 49 040 045 000 100 021 041 045 097 000 045 112 000 248 036 000 026 145 000 The...

Page 20: ...ter supplied or not reached to the preset water level within 25 minutes Page 26 1 UNBALANCE ERROR The appliance is tilted Laundry is gatherd to one side Page 27 2 WATER OUTLET ERROR Not fully drained within 10 minutes Page 28 3 OVERFLOW ERROR Water is overflowing under 21 3kHz If is displayed the drain pump operates to drain the water automatically Page 30 4 PRESSURE SENSOR S W ERROR The pressure ...

Page 21: ... not connected to the connector of STATOR ASSEMBLY Reconnect or repair the connector The hall sensor is out of order defective Replace the STATOR ASSEMBLY Page 34 8 Water leaks Page 36 9 POWER FAILURE WATER LEAKAGE The washer experienced a power failure Press the start pause button 10 ...

Page 22: ...r level frequency over 26 0khz Reconnect or repair the Connector Or replace the Harness Replace the Inlet Valve Is the Connector connected correctly to the Main PCB and the Inlet Valve is the Harness alright Check the Air Chamber and the Tube clogged Check the water level frequency again if it is over 26 2KHz replace the Pressure switch YES YES NO Replace the Main PCB NO YES YES NO NO Is the resis...

Page 23: ...ly Page 7 Is the laundry mixed The few items of clothing will clump together and their weight will be in one place on the drum throwing the weight off during spin mode So add some laundry to overcome UE error And rearrange load to allow proper spinning Try rearranging the laundry in drum Or the laundry is separated by size type and color Separate by size type and color YES YES NO NO YES ...

Page 24: ...prevents proper drainage but also will promote bacteria growth and cause odors This drain filter should be cleaned once a month How to disassemble and clean pump filter Open the Cover by coin or finger only new model Cover Drain water by removing the hose cap Disassemble the pump filter by turning the filter cap counterclockwise Filter clogged by foreign objects Assemble close cap Pump Filter filt...

Page 25: ...dpipe exceeds 1 0 m In this case water may flow back into the washer Check the Air Chamber and the Tube clogged Check the water level frequency again if it is over 25 5KHz replace the If it is clogged Pressure switch YES NO Reconnect or repair the Connector Or replace the Harness NO Replace the Main PCB NO Replace the Pump Motor Is the resistance of the Pump Motor out of range 152 175Ω Or is the I...

Page 26: ...h and Hold Pre Wash Temp simultaneously Overflow Error FE If FE is displayed again then replace the Pressure Switch If FE is displayed again then replace the Main PCB Drain out the water and then check the Air Chamber and the Tube clogged NO NO YES YES Is water continuously coming into the drawer Replace the Main PCB Replace the Inlet Valve assembly ...

Page 27: ... Main PCB and the Pressure Switch Is the Harness alright Reconnect or repair the Connector Or replace the Harness Check air chamber and remove foreign material Replace the Pressure Switch YES YES NO Is the resistance of the Pressure Switch out of range Pin1 Pin3 21 23Ω NO NO YES Pressure Sensor S W Error PE ...

Page 28: ...S YES YES YES NO Scratch by Latch Hook Touching or Is the Connector connected correctly to the Main PCB and the Door Switch Is the Harness alright Is there clicking sound once or twice when the START PAUSE button is pressed to start the cycle No Replace the MAIN PWB ASSEMBLY Does the Door Switch operate as follows Door Locking time 1 8 sec Check the time between from input the power to parts move ...

Page 29: ...r Or replace the Harness Replace the Thermistor YES Replace the Heater YES NO Is the resistance of the Heater out of range 24 5 28 5Ω for Washing or 42 5 49 5Ω for Steam Page 19 Note Thermistor Spec NO NO Thermistor Heating Error tE S P E C Temp 30 C 40 C 60 C 70 C 95 C 105 C Resistance kΩ MIN 36 35 39 45 42 72 24 20 26 05 27 97 11 43 12 12 12 82 8 088 8 514 8 940 3 544 3 791 4 045 2 617 2 816 3 0...

Page 30: ...g the hall sensor Is the Connector connected correctly to the Main PCB and the Motor Is the Harness alright YES NO YES YES YES YES NO Disassemble the Rotor Is the Magnet of rotor cracked or broken Ha Common 5 15 kΩ Hb Common 5 15 kΩ Replace the Main PCB Press the Power button Start Pause button Does the Drum stop when the start pause button is pressed to start the cycle Or Sometimes does the Drum ...

Page 31: ... the hooks of stator as shown in red circle 2 Push down the Hall sensor and assemble to the hook securely Caution If you disassemble by force not following the directions the hooks of stator red circled might break Hence need change of stator assembly So disassemble cautiously 1 Assemble the Hall Sensor 2 Note Hall Sensor Part No 24 25 6501KW2001A 27 6501KW2002A ...

Page 32: ...ay PCB Is the Connector connected correctly to the Main PCB and the Noise Filter Is the Harness alright Noise Filter Main PCB PCB Noise Filter Reconnect Power Plug firmly Check the fuse or reset the circuit breaker Don t use Multi plug socket Use Single Plug socket for washing machine YES YES Reconnect or repair the Connector Or replace the Harness Check connectors otherwise Replace Display PCB Ch...

Page 33: ...ibration Noise During Spin Have all the Transit Bolts and the Base Packing been removed NO Remove the Transit Bolts and the Base Packing Washer Base Packing Packing Support YES Refer to INSTALLATION Page 7 ...

Page 34: ...er put in the correct compartment of the drawer NO Refer to Water Inlet Error IE page 23 NO Put it in the Correct Position Reference Amount of Detergent Softener Detergent NO OK YES YES Is water supplied Is the Detergent caked or hardened Pre Wash Powder YES Softener YES Main Wash Powder Only softener ...

Page 35: ...k Is detergent softener put in the correct compartment of the drawer NO Put it in the Correct Position Replace the Dispenser Tray Reference Amount of Detergent Softener Detergent NO OK Is the Dispenser Tray Damaged or warped 1 Water Leak from Dispenser Is the Detergent caked or hardened Softener YES YES NO ...

Page 36: ...cked split Replace the damaged parts Replace the Inlet Hoses Clean the periphery of Gasket and Door regularly 3 Unknown Water on Floor YES Is the washer horizontal Adjust the height of washing machine to be kept horizontally Page 7 NO Are the drain filter and manual drain hose open YES NO Check Turn the filter cap clockwise to close YES YES NO ...

Page 37: ...40 0 1 1 0 2 9 2 9 1 1 0 9 Part inspection ...

Page 38: ...minal 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 performance and two authorization processes are allowed at most Normal operation period of PTC hea...

Page 39: ...42 Test points Result Test Points 2 to 4 3 to 4 4 to 5 2 to 4 Result 700 1500 9 60 90 9 Infinity 120 Vac Remarks At 77 F 25 C At 77 F 25 C Voltage Input 2 3 4 5 ...

Page 40: ... 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 to 2 2 to 3 3 to 1 5 15 9 5 15 9 5 15 9 ...

Page 41: ...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 42: ...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 43: ...46 9 4 PUMP MOTOR ASSEMBLY 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 Test Points Result 1 to 2 10 20 9 ...

Page 44: ...rature the controller 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 All load circuits in wiring diagram are all the same ...

Page 45: ... it up 3 Pull the drawer panel assembly out 4 Unfasten the screws from the parts displayed in the fig 5 Unfasten the screws from the parts displayed in the fig 6 Disconnect the wiring connectors between the multi harness and the control panel assembly 7 Disassemble the control panel assembly 8 Disassemble the display PCB assembly from the control panel assembly by unfastening the screws CONTROL PA...

Page 46: ... 1 The plate assembly Top are disassembled 3 Two screws are unscrewed 3 Two screws are unscrewed 2 Pull the drawer to arrow direction 4 Clamp 4 Clamp 5 Cutting cable ties and the ventillation hose are disassembly on the dispenser 5 Cutting cable ties and the ventillation hose are disassembly on the dispenser DISPENSER ASSEMBLY 2 Pull the drawer to arrow direction 2 1 ...

Page 47: ...en reconnecting the connector 1 Open the door completely 2 Remove the three screws from the hinge When removing the Door Assembly it is necessary to hold the Bracket that is inner of the Cabinet Cover First prepare a bucket to put in the remained water Pull it out from hose VIOLET BLACK BLACK WHITE BLACK BLACK GRAY BLACK INLET VALVE 3 DOOR Removing method of remained water CAP REMAING HOSE ...

Page 48: ...d unscrew 2 screws 1 Two screws are unscrewed 3 Unscrew the screws from the lower cover 2 Disassembly lower cover assembly 3 Unscrew the screw from the CABINET COVER 1 2 3 Lift the side the Control Panel Assembly and pull it out CABINET COVER Two screws are unscrewed Pull the drawer to arrow direction Screws Disassembly 3 connectors ...

Page 49: ...time 25 100 sec Check the time between from off the power to parts move down then Door released 1 1 1 1 2 4 Lift and separate the cabinet cover 1 Two screws are unscrewed and disassembly cabinet cover 2 The Door Lock S W is disconnected form the wiring connector and the strap NOTE When assembling the CABINET COVER connect the Door S W connector SWITCH ASSY DOOR LOCK ...

Page 50: ...oosening the bolt Rotor pull out the rotor 1 Remove the 6 bolts from the stator 2 Disconnect the 2 connectors 1 Remove the hinges Damper at the Tub 3 The hinge at the base is pulled off In directions of the arrow 2 The Hinge Damper at the base is pulled off by pressing on the snaps at the sharp end ROTOR ASSEMBLY STATOR ASSEMBLY FRICTION DAMPER ...

Page 51: ...ap Remaining Hose 7 Disconnect the wiring 8 Three screws are unscrewed from the cabinet 9 Remove the pump to arrow direction Rating 220 240V 50Hz Resistant 162 176Ω 1 Loosen the nut 2 Remove washing heater by pulling out When assembling the washing heater insert the heater to heater clip on the bottom of tub and check the position of wire color PUMP HEATER Heater for Washing Rating 230V 2000W Resi...

Page 52: ...n the hole WHEN FOREIGN OBJECT STUCK BETWEEN DRUM AND TUB 1 Disassembly lower cover assembly 2 Disassembly MAIN PWB ASSEMBLY 3 Disconnect the wiring connector Fist Press hook and turn the safety switch assembly switch assembly safety 4 Unscrew one screw from the base SWITCH ASSEMBLY SAFETY 2 1 ...

Page 53: ...ABINET ASSEMBLY 10 EXPLODED VIEW AND PART LIST 33 A102 A104 A106 A101 A110 A100 A430 A410 A450 A455 A200 A201 A220 A240 A133 A440 A134 A135 A310 A300 A130 A131 A141 A103 A303 A151 A150 A152 A153 A140 A154 COLD BLUE A276 A485 ...

Page 54: ...64 11 2 THE EXPLODED VIEW OF CONTROL PANEL DISPENSER ASSEMBLY F160 F432 F430 F441 F110 F225 F220 F215 F462 F300 F321 F210 F120 F322 M400 F328 ...

Page 55: ... 35 F464 K351 K350 K360 K361 K143 K123 K122 K121 K125 K320 K105 K610 K115 K135 K130 K611 K550 F468 K512 K131 K530 F461 K520 K540 F467 K410 K340 K560 K510 K140 K410 K411 F140 F310 F320 F466 K141 K110 K111 K344 F145 K346 K342 K570 K571 K572 K170 ...

Page 56: ...59 P No MFL62645342 ...

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