LG WM2050C Series User manual

100
WASHING 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
!

101
MAY. 2009PRINTED IN KOREA P/No.: MFL30599149

2
CONTENTS
1. SPECIFICATIONS ...............................................................................................................3
2. FEATURES AND TECHNICAL EXPLANATION ................................................................. 4
3. PARTS IDENTIFICATION ................................................................................................... 7
4. INSTALLATION AND TEST ................................................................................................ 8
5. OPERATION ...................................................................................................................... 11
5-1. CONTROL PANEL FEATURES ................................................................................. 11
5-2. CYCLE GUIDE ........................................................................................................... 13
5-3. SPECIAL FUNCTIONS .............................................................................................. 14
5-4. EXPLANATION OF EACH PROCESS ....................................................................... 15
6. WIRING DIAGRAM/PROGRAM CHART .......................................................................... 17
7. TEST MODE ..................................................................................................................... 19
7-1. SAFETY CAUTION .................................................................................................... 19
7-2. LOAD TEST MODE ................................................................................................... 19
7-3. HOW TO CHECK 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 ....................................................................................... 42
10. DISASSEMBLY INSTRUCTIONS .................................................................................... 43
11.EXPLODED VIEW ............................................................................................................ 49
11-1. CABINET AND CONTROL PANEL ASSEMBLY ...................................................... 49
11-2. DRUM AND TUB ASSEMBLY .................................................................................. 50
11-3. DISPENSER ASSEMBLY ........................................................................................ 51

3
1. SPECIFICATIONS
ITEM WM2050C*
COLOR W:BLUE WHITE, G:PEARLY GRAY , R:CANDY APPLE RED
POWER SUPPLY AC 120 V, 60 Hz
PRODUCT WEIGHT 192 lbs (87kg)
WASHING 280 W
DRAIN MOTOR 80 W
WASH 46 rpm
SPIN 1100 rpm
CYCLES 7
WASH/RINSE TEMPERATURES 5
SPIN SPEEDS 4
OPTIONS
Prewash, Rinse+Spin, Extra Rinse, 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 LOCK Incorporated
RLM ENABLE _
STEAM _
ELECTRIC POWER
CONSUMTION
REVOLUTION SPEED

4
2. FEATURES & TECHNICAL EXPLANATION
2-1. FEATURES
■Ultra Capacity
The Larger drum enables not just higher head drop and stronger
centrifugal force, but also less tangling and wrinkling of the
laundry. Heavier loads, such as king size comforters, blankets,
and curtains, can 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 any button to
change the settings during operation.
淡Ъ肢艇? 情捷?
淡Ъ肢艇? 情捷?

5
2-2. NEURO FUZZY WASHING TIME OPTIMIZATION
To get the best washing performance, optimal time is determined by the water temperature,
the selected washing temperature, and the size of the load.
2-3. WATER LEVEL CONTROL
●This model incorporates a pressure sensor which can sense the water level in the tub.
●The water supply is stopped when the water level reaches the preset level, the washing
program 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 locked/unlocked.
NEURO-
FUZZY
load
size
selected
washing
temperature
water
temperature
washing time
rinsing time
spin rhythm, time
the best
washing
performance
SENSING PROCESSING DETERMINATION EFFECT

6
2-5. THE DOOR CAN NOT BE OPENED
While program is operating.
When a power failed and power plug is taken out in operation.
While Door Lock lights turn on.
While the 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.

7
3. PARTS IDENTIFICATION
ÁACCESSORIES
Door 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

4. INSTALLATION & TEST
Before servicing, ask the customer what the trouble is.
Check the setup (power supply is 120V, remove the transit bolts, level the washer...)
Check with the troubleshooting guide.
Plan your service method by referring to the disassembly instructions.
Service the unit.
After servicing, operate the 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 the 4 caps (provided)
into the hole.
ADJUST THE
LEVELING
INSTALL THE APPLIANCE
ON A FLAT AND FIRM SURFACE
8

9
■HOW TO CONNECT THE INLET HOSE
󳢯Verify that the rubber washer is inside of the
valve connector.
󳢯Tighten the inlet hose securely 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.

10
TEST OPERATION
1
Preparation for
washing.
•Connect the power plug to
the outlet.
•Connect the inlet hose.
3Press the Start/Pause
button.
•Listen for a click to determine if
the door has locked.
6Check the water
temperature.
•Press the WASH/RINSE button
and the present temperature will
be displayed.
5Check the automatic
reverse rotation. 4Check the water supply.
•Check if water is supplied
through the detergent dispenser.
7Check 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.
8Press the
START/PAUSE button.
9Water removal.
•If SERVICE is needed during
check, remove the remaining
water by pulling out the hose cap.
2Press the POWER button.
•Listen for a click to determine
if the door is unlocking.
7
•Check if the drum rotates
clockwise and counterclockwise.

11
5. OPERATION
5-1. CONTROL PANEL FEATURES
WM2050C*
8

EESSTT.. TTIIMMEE RREEMMAAIINNIINNGG
• This display shows:
a) the estimated time remaining
in the cycle when operation.
b) an error code when an error
has been detected.
CCYYCCLLEE SSEELLEECCTTOORR
• Rotate the cycle selector knob
to select the cycle designed for
different types of fabric and
soil level.
SSTTAARRTT//PPAAUUSSEE bbuuttttoonn
• Use this button to
start/stop the
washer.
WWaasshh,, RRiinnssee tteemmpp..,, SSppiinn ssppeeeedd,, SSooiill LLeevveell
• Select a water temperature based on the type of load you are washing.
• To change the spin speed, press the Spin Speed button repeatedly
to cycle through available options.
• To change the soil level, press the Soil Level button repeatedly until
the desired setting is on.
OOPPTTIIOONN bbuuttttoonn
• Prewash: Use this option for loads that need
pretreatment. It adds 16 minutes prewash and drain.
• Rinse + Spin: Use this option to rinse and then spin.
• EXTRA RINSE: Select this option to rinse and
spin a load separately from a regular cycle.
• Stain Cycle: Add time to the wash and rinse
for better stain removal. Automatically provide a rinse.
• WATER PLUS:Select this option to add extra
water to the wash and rinse cycles for superior
results, especially with large or bulky items.
PPOOWWEERR bbuuttttoonn
• Use this button to turn
power On/Off.
DDeellaayy WWaasshh,, CCUUSSTTOOMM PPRROOGGRRAAMM
• Delay Wash allows the start of any cycle to be delayed for 1~19 hours.
• CUSTOM PROGRAM allows you to store a customized wash cycle
for future use.
DDOOOORR LLOOCCKKEEDD llaammpp
• Light whenever the door of the washer is locked.
• The door can be unlocked by pressing the Start/Pause
button to stop the washer.
12
EESSTT.. TTIIMMEE RREEMMAAIINNIINNGG
• This display shows:
a) the estimated time remaining
in the cycle when operation.
b) an error code when an error
has been detected.
CCYYCCLLEE SSEELLEECCTTOORR
• Rotate the cycle selector knob
to select the cycle designed for
different types of fabric and
soil level.
SSTTAARRTT//PPAAUUSSEE bbuuttttoonn
• Use this button to
start/stop the
washer.
WWaasshh,, RRiinnssee tteemmpp..,, SSppiinn ssppeeeedd,, SSooiill LLeevveell
• Select a water temperature based on the type of load you are washing.
• To change the spin speed, press the Spin Speed button repeatedly
to cycle through available options.
• To change the soil level, press the Soil Level button repeatedly until
the desired setting is on.
OOPPTTIIOONN bbuuttttoonn
• Prewash: Use this option for loads that need
pretreatment. It adds 16 minutes prewash and drain.
• Rinse + Spin: Use this option to rinse and then spin.
• EXTRA RINSE: Select this option to rinse and
spin a load separately from a regular cycle.
• Stain Cycle: Add time to the wash and rinse
for better stain removal. Automatically provide a rinse.
• WATER PLUS:Select this option to add extra
water to the wash and rinse cycles for superior
results, especially with large or bulky items.
PPOOWWEERR bbuuttttoonn
• Use this button to turn
power On/Off.
DDeellaayy WWaasshh,, CCUUSSTTOOMM PPRROOGGRRAAMM
• Delay Wash allows the start of any cycle to be delayed for 1~19 hours.
• CUSTOM PROGRAM allows you to store a customized wash cycle
for future use.
DDOOOORR LLOOCCKKEEDD llaammpp
• Light whenever the door of the washer is locked.
• The door can be unlocked by pressing the Start/Pause
button to stop the washer.
8

13
5-2. CYCLE GUIDE
The cycle guide below shows the options and recommended fabric types for each cycle.
Drain, Spin Only
DRAIN+
SPIN
Tap/Cold
Tap/Cold
Tap/Cold
Tap/Cold
Tap/Cold
Tap/Cold
NOTE: To protect your garments, not every wash/rinse temperature, spin speed, soil level, or option is
available with every cycle.

14
5-3. SPECIAL FUNCTIONS
The option buttons also activate special functions, including CHILD LOCK, LOAD SIZE, TUB CLEAN, and
SPIN SENSE. Press and hold the option button marked with the special function for 3 seconds to activate.
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. Press and hold the PREWASH button for 3 seconds
to activate or deactivate CHILD LOCK. CHILD LOCK will be shown in the display, and all
controls are disabled except the ON/OFF button. The washer can be locked during a cycle.
LOAD SIZE
At the beginning of the cycle, the washer tumbles the load and detects the weight of the
clothes.
The display will indicate the approximate load size in the LOAD SIZE display. This allows you
to Adjust the amount of detergent and other additives for best results and improved efficiency.
TUB CLEAN
A buildup of detergent residue can occur in 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, and do NOT add detergent or fabric softener.
SPIN SENSE
To activate SPINSENSE :
While the washing machine is runnung in any cycle, press and hold the STAIN CYCLE button
for 3 seconds. The SPIN SPEED button light will blink while the washer is running to show
that SPINSENSE is active. The SPINSENSE function will remain active for every cycle, even
after a power failure.
To cancel SPINSENSE :
Press and hold the STAIN CYCLE button for 3 seconds to turn off the SPINSENSE
function
BEEPER ON/OFF
You may turn the end-of-cycle beeper on or off with the WATER PLUS button during the
cycle. Press and hold the WATER PLUS button for 3 seconds to turn the beeper off. Press
and hold the WATER PLUS button again for 3 seconds to turn the beeper back on.

15
5-4. EXPLANATION OF EACH PROCESS
No. Process Explanation
1. Stay • Electrical power is supplied
• Washer is ready to work and the micom is in the active mode.
2. Water
supply
•After loading laundry and selecting a course and a cycle, water is
supplied and drum rotates.
•When a user selects Pre-wash course, water is supplied through pre
wash valve.
3. Soaking
& washing
laundry
• To get laundry wet, drum rotates clockwise and counterclockwise.
•If water amount is insufficient at this time, the Inlet valve will supply
water again.
4. Washing • Fuzzy Logic decides washing time according to 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 laundry load and senses the eccentricity of the load, to only
allow spinning without vibration
•If the eccentricity is worse than the allowed level, it repeats the
disentangling process. When the repeated time is more than allowed
level, it displays UE.
•If the eccentricity is good, the intermittent spin starts.
•During this process, the drain pump works for drainage intermittently.

16
No. Process Explanation
A. Intermittent
spin
•To reach the correct set speed, the motor rotates clockwise and
counterclockwise directions after spin process starts.
•If the water level frequency is lower than 23.0 kHz, a washer senses
suds and starts suds removal process.
B. Rinse
spin
•In this process, the remaining water during washing process is
extracted and the selected speed is kept.
•Removing suds process is in active mode at this cycle.
C. Remaining
spin
• After spin finishes, the drum rotates by remaining spin power until it stops.
Motor power is off.
•This process is overlapped with next process.
D. Rinse water
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 spin speed will reach the selected rpm.
K. Remaining spin • The same with item C.
L. Disentangling • After spin finishes, disentangling starts to remove unbalanced
laundry.
M. End • After 'end' signal is displayed, it stays for 8 seconds and power is
automatically turned off. (Auto type door switch)
•After door switch is off, end signal is displayed in the case of
manual type and it takes around 2 minute to turn off door switch.

17
6. WIRING DIAGRAM/PROGRAM CHART
+HOUSING
1 2 3 4 5 6 1 2 3
1 2 3 1 2 34
1 2 3 4 1 2 3
2 1
2 1
4
321
3 2 1
21
21
5 6
1 2 3 4 5 6 1 2 3 4
13 4
1 2
2
34
5 6
134
12
2
34
NA
NA
NA RD BK
BL
NA
BL
YL
6 72 3 4 51 6 72 3 4 51 6 72 3 4 51 6 72 3 4 51 62 3 4 51 7
2 31 2 3
4 4
3 2 1 3 2 1
1
RD
NA
2 3 4 5 6 7 8 9 10 111
NA NA
NA
BL
MAIN PWB
HOT
VALVE
PRE
WASH
MAIN
WASH
BLEACH
DISPLAY PWB
DISPLAY PWB

18
52
52
55
55 45
20

7. TEST MODE
19
7-1. SAFETY CAUTION
There's built-in AC 120V and DC power in output terminal of PWB assembly in common. Be careful electric
shock when disconnecting parts while trouble shooting. (Wear Electro Static Discharge gloves when working.)
After cutting off the power when changing PWB assembly, disconnect or assemble.
Be careful static when handling PWB assembly, and use Electro Static Discharge plastic pack when delivering
or keeping it.
7-2. LOAD TEST MODE
The washer must be empty and the controls must be in the off state.
1. Press the WASH/RINSE and SPIN SPEED buttons simultaneously.
2. Press the Power button, while the above condition. Then buzzer will sound twice.
3. Press the Start/Pause button repeatedly to cycle through 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.
Inlet valve for bleach turns on.
Tumble counterclockwise.
Water Temperature (Thermistor)
Drain pump turns on.
Off
rpm (42~50)
rpm (55~65)
rpm (105~115)
Water level frequency (225~265)
Water level frequency (225~265)
Water level frequency (225~265)
Water level frequency (225~265)
rpm (42~50)
Water temperature [°C]
Water level frequency (225~265)
The digits indicate the water level frequency.
For example, if the display indicate 41,
the water level frequency is 20+(41X0.1) = 24.1 kHz.
Number of times the
Start/Pause button is pressed
Check Point Display Status