LG Electronics W/M Division
Controller
Schedule
SVC Manager from Europe
1day
1. Function Diagram & Circuit
- circuit & parts.
2. How to check defects ?
- Error mode
- Connection Loose
3. Algorithm
4. Electric parts
5. Quality information
6.WrapUp(Q&A)
Aug 25, 2007

Profitable Growth 2010
Creating Value for the Customer!
MICOM
Pressure
Thermistor
Voltage
DOOR S/W
DOOR
Sensing
Pressure
Water Temp
Hall IC
ROTOR
Location
DC LINK
Voltage
STRUC-
TURE
SYSTEM
Micom
Peripheral
reset
resonator
Relay
Triac
Rrelay
X3
Interface
Part
S/W
LED
Buzzer
AC IN
Linear
Transformer
Motor
Wash Heater
Door S/W
Inelet Valve
Pump
Key input
LED Driver
Buzzer Out
Clear Micom
Clock
7812
7805
AC-DC
CONVERTER
Triac

Profitable Growth 2010
Creating Value for the Customer!
MICOM
Pressure
Thermistor
Voltage
DOOR S/W
DOOR
Sensing
Pressure
Water Temp
Hall IC
ROTOR
Location
DC LINK
Voltage
STRUC-
TURE
SYSTEM
Micom
Peripheral
reset
resonator
IPM
Interface
Part
S/W
LED
Buzzer
AC IN
AC-DC
Converter
SMPS
16.5V
12V
12Vac
7805
Motor
Wash Heater
Door S/W
Inelet Valve
Pump
Signal out
Sensing Over Current(Fo)
Key input
LED Driver
Buzzer Out
Clear Micom
Clock
STEAM
Generator

Profitable Growth 2010
Creating Value for the Customer!

Profitable Growth 2010
Creating Value for the Customer!

Profitable Growth 2010
Creating Value for the Customer!
D2
D1
ZD1
SMPS(sample)
1
2
3
4
5
6
7
8
9
D3
D4
CE1
CE2
CE3
R2
R1
R3
+
-
D6
1
2
4
3
CE6
IC241
*TOP246Y
C
1
D
6
S
4
L
2
F
5
X
3
ZD1
R4
CE4
D5
AC
V3
V2
V1
R6
C1
C2
R5
ZD2

Profitable Growth 2010
Creating Value for the Customer!
1
8
16
TR ARRAY
Cs
GATE T1
T2
TRIAC
Cg
VDC
Load
Rg
MICOM
VAC
Rs
R
1
2
3
4
1
8
16
TR ARRAY
5V
Cs
GATE T1
T2
TRIAC
Cg
VDC
Load
Rg
MICOM
VAC
Rs
PHOTO
COUPLER

Profitable Growth 2010
Creating Value for the Customer!
C312
104
D303
US1J
R503
*2K 1/4W
C503
102
C303
104
16.5V
C308
104
C75
*224/630V
5V
ZD301
*24V 1W
R304
*10 1/4W
R302
4.7K
R301
*3K 1/4W
VCC
Fo
Un
Vn
Wn
GND
Cin
Cfo
Vcc
In Com
VbHoVs
U-
V-
W-
Vno
W-
V-
U-
Vcc
In Com
VbHoVs
Vcc
In Com
VbHoVs
IPM
PS21564(15A)
P
22
Cin
19
Cf0
18
N
26
21
17
Un
14
Vn
15
Wn
16
Vnc
20
Vufs
1
W
25
Vuee
2
Vp1
3
V
24
Up
4
Vwfs
9
Vwfb
10
VP1
11
Wp
12
Vvfs
5
Vvfb
6
VP1
7
Vp
8
U
23
C304
102
C306
102
R502
1.8K 1%
5V
C311
104
D301
US1J
R75
*RM0.027 5W 1%
CE303
*47uF/35V
C316
102
R510
33K 1%
C314
102
CE301
*47uF/35V
+
-
-
+
VCC
VEE
IC703
IC KIA393F
1
2
3
4
5
6
7
8
R303
*10 1/4W
C315
102
5V
IPM DRIVE
C313
104
C309
104
C502
103
16.5V
C305
102
C302
472
C76
*102
D302
US1J
C310
104
CE302
*47uF/35V
R305
*10 1/4W
C307
102
A
123
456
B
C

Profitable Growth 2010
Creating Value for the Customer!
Micom
▼
TP
〓
∋
←
∈
MS
MR
AC
1
3
4
2
∼
+
-
∼
BD1
*GSIB1560
C1
2
1
5
3
4
X1
2
1
5
3
4
X2
2
1
5
3
4
X3
SD132
*1N4148
R/L
SD131
*1N4148
12V
12
Micom
AC
1
2
4
3
NC
NO
Tab Ralay
X100
3
4
12V
부하
Heater
X3
X1
X2

Profitable Growth 2010
Creating Value for the Customer!
Error Mode
No Error Code
Display Cause
Remark
1 Inlet Error
Correct water level(246) is not reached within 8 min.
It doesn't reach the preset level within 25min.
2 Drain Error
Not fully drained within 10 min.
3P
r
e
s
s
u
r
e
Sensor Error
Pressure switch (water level sensor) defect
4 Over Flow
Over flow water level (water level frequency is over 213)
If FE is displayed, the drain pump will operate to drain the water automatically
5 Door Error
Door not all the way closed
Operate washer while door open.
6T
h
e
r
m
i
s
t
o
r
Error
Thermistor for wash is short-circuit(98℃) or open(-20℃)
Thermistor for dry is short-curcuit(120℃) or open(-20℃)
7 Unbalance
The load is too small or washer is tilted
Laundry is gathered in one side.
8 Motor Lock
Continue the motor ripm uner 15rpm for 180sec or motor locked.
DD model
9 Overcurrent
High current detected over 20 times within 1min.
10 Leaking
Leaking sensing or Aqua-Stop switch operation
Aqua-stop
11 Power Error
The washer is experienced a power failure and restart the cycle
DD model
12 Dry Heating
Error
Temperature is over the 98℃ after 4min in dry course
Temperature rising is under 10℃ than starting temperature
Fan motor is restricted.
DD Combo
13 EEPROM
Error
Error for EEPROM in PCB. Only when start button is first pressed in the QC test mode QC Test Mode
14 Over voltage
Only when DC Link voltage level is over 430V in the QC test mode
DD model
QC Test Mode

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Points
* The measure point of switch
is as follows

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Profitable Growth 2010
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Profitable Growth 2010
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--

Profitable Growth 2010
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--

Profitable Growth 2010
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"
"
"CE" displays

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Condition : The thermistor is open (lower than (-20℃) or short (higher than 96℃)
1. Exchange the seal between Tub
cover and tub
2. Add some more clamp around tub
cover.
Fix the Connection
Water
trace
Yes
No
No
Exchange Thermistor
Short
/ Open
Check the trace of water infiltration into
thermistor terminals
Check the thermistor is open or not
The normal resistance of thermistor is 30~70 .
Check connection between a thermistor and a
controller connector. When moving the connector,
does 'tE' appear?
Sensing part of 'tE' on Main controller consists of
only resistor and capacitor so that the defect
possibility is very less.
Good
Is Check heater resistance out of range?
(12~18Ω)
Is Check thermistor resistance out of range?
(about 39.5 ㏀ at 30℃ )
"
"

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Connection Loose

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No power, Not operation

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Example of faulty SVC

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Sensing and removing Suds during Washing course
Sensing and removing Suds during Spinning course
Washing Process
Lower than
23.0KHz
Draining for 1minute
Not working for 2minute
Draining : 1minute
Pre valve is on/off 4sec 3 times
→ Breaking for 2 minutes
Washing Finish
Spinning Process
Suds sensed
Draining for 1minute
Draining and supplying
for 1minute
Breaking for 2minute
Washing Finish
If frequency is lower
than 23.0KHz, the
machine decides it has
suds problems.
(But, in heating course
the frequency is 22.9KHz)
Pre-valve is on
3times
※ < Remarks>
During wool, blanket and stay cooling course,
the sensing suds does not work
Heater is off while removing suds
Motor is off during draining

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When the key is pressed, it displays like below.
3:00
4:00
19:00
The delay time is the time from present time to the time when all the cycle is finished.
The machine starts its first step 25 minute earlier considering water supplying time and heating time.
< For example >
A customer selected 3 hours delay time
Approximate time for normal
course 1hour and 20minute
25
minute
1hours and 15minute
◈ The program is started 25 minute earlier considering below factors
Water supplying time change
Heating time change according to the water temperature.

Profitable Growth 2010
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Laundry detecting is executed by water re-filling time.
Water re-filling time = 0 (Small amount of laundry)
Water re-filling time is more than 1 time : Big amount of laundry
When laundry detecting is executed during pre-wash course, it is omitted during main
wash course.
1) Water level for each function
Level Frequency
Function
Water
amount(ℓ)
9
21.4
Over flow detecting (Drain pump works)
43
8
22.9
Sensing suds during heating course
31
7
23
Blanket and wool washing and rinsing course
Water supply stops for Stay cooling
Extra rinsing, Sensing suds
17.4
6
23.4
13.8
Extra Shower rinsing
5
23.5
11.8
Small rinsing course
4
23.7
8.7
Shower rinse, synthesis
3
23.8
7.7
Washing heater on, Normal, synthesis, heating
2
24.8
2.8
1
25.2
2
Initial state, Cold V/V operating
Washing heater on, Normal, synthesis, heating
The water level sensing
is executed 2second later
after motor stop.
When laundry absorbs water so that
the frequency become lower, the re-filling
is started until the frequency reaches it again
23.8KHz
< Re-filling water system>

Profitable Growth 2010
Creating Value for the Customer!
QC Test mode / summery
MOTOR LOOK
모델명
Test mode 진입 시 입력 key
SWING
WD-??13?F
TEMP KEY + OPTION2(creasecare+rinse+) KEY + POWER KEY
Tzar_Swing
WD-??13?N/S TEMP KEY + OPTION2(creasecare+rinse+) KEY + POWER KEY
ELAN
WD-??16?F
TEMP KEY + OPTION2(creasecare+rinse+) KEY + POWER KEY
Tzar_Elan
WD-??16?N
TEMP KEY + OPTION2(creasecare+rinse+) KEY + POWER KEY
TZAR
WD-??18?N/S SPIN KEY + OPTION2(creasecare+prewash) KEY + POWER KEY
Tzar_Bluebird WD-??15?N/S CREASE CARE KEY + PRE WASH KEY + POWER KEY
C/D LOOK WD-??4?FB/??5?FB RINSE KEY + SPIN KEY + POWER KEY
F LOOK
WD-??7?FB
TEMP KEY + SPIN KEY + POWER KEY
G LOOK
WD-??9?FB
CREASE CARE KEY + SPIN KEY + POWER KEY
BLUEBIRD WD-??15?FB
CREASE CARE KEY + PRE WASH KEY + POWER KEY
TA I/II
WD-??6?FD/??8?FD RINSE KEY + SPIN KEY + POWER KEY
TA LED
WD-??11?FD
TEMP KEY + SPIN KEY + POWER KEY
TA LCD
WD-??10?FD
CREASE CARE KEY + SPIN KEY + POWER KEY
D
WD-??17?ND/SD
KGD I/II
WD-????RD
SPIN KEY + OPTION2(creasecare+prewash) KEY + POWER KEY
RINSE KEY + SPIN KEY + POWER KEY
FSFS-I
WD-??1?C
FSFS-II
WD-??2?C
TEMP KEY + SPIN KEY + POWER KEY
RINSE KEY + SPIN KEY + POWER KEY
UNIV
-MOTOR
BLDC
-MOTOR
DD
-MOTOR
TZAR-DD
전원 OFF 상태에서 각 모델별 하기와 같이 3개의 KEY를 동시에 누르면 Buzzer 2회 작동하면서 TEST MODE
진입함. 이후 동작KEY의 입력에 따라 각각의 부하 TEST 가능함.

Profitable Growth 2010
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Model : WD-102(4)W / WD-1050(5)F / WD-1253(5)F
QC Test mode /
▣ To use QC Test mode, push the Power' button on and then press the 'Spin' button and
a 'Rinse' button simultaneously . And then press the 'Start/pause' button step by step.
Times of
Press
Checking Point
Motor or Drum
r.p.m
1 time
None
4 times
2 times
3 times
6 times
5 times
10 times
7 times
8 times
9 times
Water level
frequency
Water level
frequency
meaning
All Lamps on
Counterclockwise spin
Low speed Spin
High speed Spin
Inlet valve for pre-wash operation
Inlet valve for(shower-rinse) operation
Inlet valve for main-wash operation
Clockwise spin
A Heater is in operation for 3 sec.
Draining pump operation
Auto off operation
WD-1020W
WD-1040W
WD-1050F
WD-1055F
WD-1253F
WD-1255F
Display Status
6~14
3~6
40~50
98~110 55~65
63~67
105~162 95~105 114~120
25~65
25~65
25~65
6~14
3~6
40~50
Water temperature
25~65
All lamps turn off
▣ Even if you press the button to check inlet valve, inlet valve does not operate until the drum comes to
a complete stop from spinning.
▣ In no water state, the frequency is 63~67.

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QC Test mode /
Model : WD-80130F / WD-10130(5)F / WD-65130F

Profitable Growth 2010
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QC Test mode /
Model : WD-14311(6)RD / WD-1481RD / WD-14311RDA / WD-12311(6)RD
HOW TO CHECK THE WATER LEVEL FREQUENCY
HOW TO CHECK THE WATER Temperature

Profitable Growth 2010
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QC Test mode /
Model : WD-14331(6)R(A)D / WD-12331(6)R(A)D / WD-14335AD
HOW TO CHECK THE WATER LEVEL FREQUENCY
HOW TO CHECK THE WATER Temperature

Profitable Growth 2010
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QC Test mode /
Model : WD-1637(0~9)FD / WD-1437(0~9)FD / WD-1237(0~9)FD
HOW TO CHECK THE WATER LEVEL FREQUENCY
HOW TO KNOW TO TEMP. OF EACH THERMISTER AT OPERATING CONDITION

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Noise Filter
When Resistance (Ohm) checking the Component, be sure to turn the
power off, and do voltage discharge sufficiently.
FILTER ASSEMBLY (LINE FILTER)
DOOR SWITCH
(1) (3)
WH
(1)
(3)
RD
(1)
(3)
RD
(1)
(3)
WH
Test Points
Result
WH(1)toRD(3)
0Ω
WH(3)toRD(1)
0Ω

Profitable Growth 2010
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door switch
'
""
'

Profitable Growth 2010
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Pressure switch
1) A basic principle
Trip point
Reset point
Pressure Switch
Air chamber
Tube
: When a cup is put into water upside down,
the air in the cup is compressed and its pressure
becomes higher than the atmosphere pressure.
The compressed air in the tube connected to Diaphragm and
operates pressure switch to convert the changed air pressure
to electronic frequency.
2) Structure
①
③
④
⑤
⑥
②
1.Cover : It receives the air pressure from a tub
2.Diaphragm : It goes up by the Air pressure
3.Core : Ferrite core moves up and down with Diaphragm.
4.Coil : Weak current flows through coil and Inductance
is varied by the core position.
5.Capacitor : It oscillates the alternating current with
input direct current .
6.Adjust bolt : It adjusts stable frequency to get proper water level.

Profitable Growth 2010
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Pressure switch
Pressure
switch
tube
Air chamber
Diaphragm
Core
Coil
Outer tub
3) Working principle
＊ The air in the chamber at the bottom of Outer Tub is compressed
While Tub is filled with water coming from Inlet valve.
＊ The compressed air makes the diaphragm of the pressure switch through
the pressure switch tube and the core moves up.
＊ Therefore, the frequency from the signal wire is changed according to
the conversion of the " L".
＊ When pressure senses the selected water level, micom stops water
supply and starts wash cycle.
＊ During Drain cycle, the air pressure in the chamber becomes lower,
while the water in the Tub is drained out.
Therefore, the core goes down by the spring force.
＊ When pressure sensor senses the reset water level(No water in Tub),
micom stops drain cycle and start spin cycle
kHz
mmH O
2
H1
H2
H3
low mid high
Water level specification graph
0
mH
: frequency
: Coil L value
f = frequency
L = Coil Inductance
C = Capacitance
* Basic Equation
f=
2π LC
1

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[Fig1] Water supply stop [Fig2] Power On
[Fig3]Water supply
H1
H2
P1
P2
P3
<How to supply Water >
Inlet valve
＊Water is supplied to the inlet valve and it makes water pressure of P1 and P2 equally through H1.
＊When electrical current is supplied to coil, plunger is pulled and H2 is opened by magnetic force
＊Water pressure of P1 through H1 becomes higher than that of P2 through H2 because the diameter
of H1 is smaller than that of that of H2 (H1 hole size < H2 hole size)
* Diaphragm and Diaphragm Holder are moved by the difference of water pressure
* Water supplying starts.
[Fig1]Power Off
[Fig2] Water supply stop
H1
H2
P1
P2
P3
< How to stop water supply>
<How to supply Water >
< How to stop water supply>
＊ When power supplying to the coil stops, spring pushes plunger to block H2 hole.
* Because water pressure of P1 is higher than that of P2, water is continuously supplied into
solenoid part through the H2 hole.
＊ Diaphragm and Diaphragm Holder move together and the valve is closed,
Water pressure of P1 becomes equal with that of P2 and Water supplying stops.

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Heater Assembly
1. The heater is designed to raise the wash water to the
desired temperature selection during certain wash cycles.
Test Points Result
(1) to (2) 12-18 Ω
(1)
(2)
(3)
(4)
2. The thermistor (temperature sensor) is used to monitor
water temperature in the tub.
Test Points
Result
Remarks
39.5 ㏀ At 86℉ (30℃)
At 104℉
(40℃)
12.1 ㏀
At 140℉
(60℃)
8.5 ㏀
At 158℉
(70℃)
3.8 ㏀
At 203℉
(95℃)
At 221℉
(105℃)
26.1 ㏀
2.8 ㏀
(3) to (4)

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Comparison of the MOTOR

Profitable Growth 2010
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Profitable Growth 2010
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Profitable Growth 2010
Creating Value for the Customer!

Profitable Growth 2010
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Profitable Growth 2010
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Profitable Growth 2010
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Profitable Growth 2010
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Profitable Growth 2010
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Profitable Growth 2010
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Applicable Model : All model
* Normal condition : Conditioner is designed to be supplied at the last rinse course.
[No taking conditioner answer flow]
Yes
1. Conditioner is supplied
before the last rinse?
Ans) Please keep the level in the detergent
box lower than the Max line please.
No
2. Conditioner is not supplied at all after
finishing the wash cycle?
3. The customers complains of
conditioner residual ?
Ans) Please clean the detergent box,
including the conditioner cap.
No
Yes
Powder
Powder type should not be used in the
detergent box, but be manually used.
only liquid type is possible
3. What type of conditioner are used?
- Powder / Liquid
Liquid
If it is too sticky, please mix the conditioner
with water a little.
Yes
Is the conditioner sticky ?
No
The Technician will visit and look into.

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Profitable Growth 2010
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Q&A
Wash cycle time delayed
The washing time may vary by the amount of laundry, water temperature
and other using condition.
If the unbalance is detected or if the suds removing program works,
the wash time shall be increased.
 Water does not enter washer
or it enters slowly
Check another tap in the house.
Fully open tap.
Straighten hose.
Check the filter of the inlet hose.
 Smell
 When installing the drain hose to a sink, make sure that
the drain hose is fixed before the "U-bend" - This will
prevent smells coming up from the drain.
Door does not open
 Once started, the door can not be open for safety reason.
Wait one or two minutes before opening the door to give electric locking
mechanism time to open.
Washer won't spin
Check the the door is firmly closed
 Thumping sound
This is usually sound (In case of heavy wash load)
If sound continue, washer is probably out of balance.
Stop and redistribute wash load.
 Suds over
 To much detergent or unsuitable detergent may cause
excessive foaming which may result in water leaks.
 Water in the washer does not
drain or drains slowly
 Clean and straighten the drain hose.
Clean the drain filter.

Profitable Growth 2010
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Q&A
Noise during water fill
Check for kinked hoses. Make sure the valves are open.
Make sure water pressure is not unusually low or high.
Make sure the original hoses are used to provide
proper volume.
Thumping/Banging sound
If the machine is making banging/thumping noises and
the drum is not turning, turn off the machine immediately.
Unplug the machine and check if the shipping bolts
have been removed.
 Adding more load during
operation
 Pause the machine using the Start/Pause button,
add the extra load. Then again depressing the Start/Pause
button, This will take the appliance off pause and the
wash will continue.
I want to program an additional
washing time.
 The length of the wash cycle is controlled by the program.
It can not be manually adjusted.
 Water Level low
 The roller jets and water circulation will compensate for
the lower water level. The water level will not be above
the bottom of the door glass