LG WD-15439BDA Service Manual ▷ View online
20
ERROR SYMPTOM
CAUSE
• The connector (3-pin, male, white) in the MOTOR
HARNESS is not connected to the connector
(3-pin, female, white) of STATOR ASSEMBLY.
(3-pin, female, white) of STATOR ASSEMBLY.
• The electric contact between the connectors
(3-pin, male, white) in the MOTOR HARNESS
and 4-pin, female, white connector in the MAIN PWB
ASSEMBLY is bad or unstable.
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).
circuited).
• The hall sensor is out of order/defective.
8
9
LOCKED
MOTOR
ERROR
• The washer experienced a power failure.
POWER
FAILURE
• EEPROM is out of order.
※ Displayed only when the START/PAUSE button is first
pressed in the QC Test Mode.
10
EEPROM
ERROR
21
8-3. TROUBLESHOOTING SUMMARY
Remark
Result
(tolerance
5%)
At 86
℉
(30
℃
)
At 104
℉
(40
℃
)
At 140
℉
(60
℃
)
At 158
℉
(70
℃
)
At 203
℉
(95
℃
)
At 221
℉
(105
℃
)
39.5 k
Ω
26.1 k
Ω
12.1 k
Ω
8.5 k
Ω
3.8 k
Ω
2.8 k
Ω
Remarks
Result
(tolerance
5%)
At 86
℉
(30
℃
)
At 104
℉
(40
℃
)
At 140
℉
(60
℃
)
At 158
℉
(70
℃
)
At 203
℉
(95
℃
)
At 221
℉
(105
℃
)
At 241
℉
(1
16
℃
)
At 266
℉
(130
℃
)
At 293
℉
(145
℃
)
At 320
℉
(160
℃
)
At 356
℉
(180
℃
)
39.5 k
Ω
26.1 k
Ω
12.1 k
Ω
8.5 k
Ω
3.8 k
Ω
2.8 k
Ω
2.1 k
Ω
1.4 k
Ω
1.0 k
Ω
0.7 k
Ω
0.4 k
Ω
Lamp
RD Pin1 to Pin3: 16.5 V
Thermistor
Pin4: W
ash thermistor
Motor
Hall Sensor
RD
Pin1: U
Pin2: V
Pin3: W
NA
Pin1: +
Pin2: Hb
Pin3: Ha
Pin4: GND
Door Switch
NA
Pin1: PTC
Pin2: PTC
Inlet V
alve
NA_
Pin3: Main wash
BL3
BL4
Pin1: Common
Pin2: Pre wash
Pin3: Bleach
Pin4: Hot valve
Result
T
est Points
8~12 k
Ω
8~12 k
Ω
10~15 Vdc
10 Vdc
10 Vdc
Remark
V
oltage Input
Pulsing Signal
Pulsing Signal
Pin1 to Pin2
Pin1 to Pin3
Pin1 to Pin4
Pin2 to Pin4
Pin3 to Pin4
Result
T
est Points
700-1500
Ω
60-90
Ω
Infinity
120 V
a
c
Remark
At 77
℉
(25
℃
)
At 77
℉
(25
℃
)
V
oltage Input
Pin2 to Pin4
Pin3 to Pin4
Pin4 to Pin5
Pin2 to Pin4
steam generator
Result
T
est Points
0
Ω
0
Ω
0
Ω
0
Ω
WH Pin1 to RD Pin3
WH Pin3 to RD Pin1
YL
Pin1 to WH Pin3
YL
Pin2 to WH Pin1
Heater:
12 -18
Pin1 to Pin2:
0.8~1.2
Heater
BL, BK, pin1: V
ac (input)
BL, pin2
: steam generator
heater (input)
BK,
pin2: wash heater (input)
pin2: steam generator/
YL,
wash heater (output)
pin1: V
ac (output)
Ω
Ω
AG Sensor
YL,
pin1: GND
pin2: S
pin4: L
Pump
BL3 Pin3: Circulation pump
BL4 Pin1: Drain pump
BL4, pin1 to BL3 pin3
1. Pump running: 120V
5%
2. Stopped Motor/Pump: 0~1V
Result
T
est Points
10-20
Ω
18-30
Ω
(1) to (2)
(1) to (2)
Result
T
est Points
5~15
Ω
5~15
Ω
5~15
Ω
Pin1 to Pin2
Pin2 to Pin3
Pin3 to Pin1
Steam generator Thermistor
W
ash thermistor
22
8-4. TROUBLESHOOTING WITH ERROR
INLET VALVE ERROR
Is displayed?
When you press both
WASH/RINSE button and
DELAY WASH button
simultaneously,
is the water level frequency
below 24.6 kHz?
WASH/RINSE button and
DELAY WASH button
simultaneously,
is the water level frequency
below 24.6 kHz?
(Refer to 7-3.)
Is filter inlet valve clogged
with foreign material?
with foreign material?
Is the connector connected to
inlet valve assembly
disconnected or
disassembled?
inlet valve assembly
disconnected or
disassembled?
Is resistance between
each terminal of INLET
VALVE ASSEMBLY
0.8-1.2 k
each terminal of INLET
VALVE ASSEMBLY
0.8-1.2 k
Ω?
(Refer to 9-5 inlet valve
assembly)
assembly)
Clean or
replace the filter.
replace the filter.
Check the AIR
CHAMBER
and the tube
(clogged).
CHAMBER
and the tube
(clogged).
Yes
No
No
Yes
Yes
Reconnect or
repair
the connector.
repair
the connector.
Replace the
INLET VALVE
ASSEMBLY.
INLET VALVE
ASSEMBLY.
Yes
Yes
Is the voltage of the inlet
valve connector 120 V AC?
(Check the all terminal of
INLET VALVE ASSEMBLY
while the power is on.)
valve connector 120 V AC?
(Check the all terminal of
INLET VALVE ASSEMBLY
while the power is on.)
Replace the
INLET VALVE
ASSEMBLY.
INLET VALVE
ASSEMBLY.
No
Yes
Is the connector connected to
MAIN PWB assembly
disconnected or dis-
assembled?(NA4, BL3, NA)
MAIN PWB assembly
disconnected or dis-
assembled?(NA4, BL3, NA)
Reconnect or
repair
the connector.
repair
the connector.
No
Yes
Yes
Is Electrical connection
correct?
correct?
(Refer to 9-5 wiring diagram)
Replace the
MAIN HARNESS.
MAIN HARNESS.
No
No
After checking connector,
is the water level frequency
below 24.6 kHz?
is the water level frequency
below 24.6 kHz?
(Refer to 7-3)
Replace the MAIN PWB
ASSEMBLY.
ASSEMBLY.
[Note] Environmental safety check list
1) No water tap leakage
2) No water tap freeze
3) No entanglement of water supply hose
4) No water shortage
5) No shrinkage on water supply hose due to
1) No water tap leakage
2) No water tap freeze
3) No entanglement of water supply hose
4) No water shortage
5) No shrinkage on water supply hose due to
a possible misuse of hot and cold water
6) No water supply hose leakage
Check the
PRESSURE
SWITCH.
PRESSURE
SWITCH.
Yes
No
No
23
DRAIN ERROR
Is displayed?
Is the connector connected
to pump motor assembly
disconnected or
disassembled?
to pump motor assembly
disconnected or
disassembled?
Reconnect or
repair
the connector.
repair
the connector.
Yes
Circulation pump
Yes
Drain pump
Connection connector
No
Yes
When you press both
WASH/RINSE button and
DELAY WASH button
simultaneously, is the
water level frequency
below 26.0 kHz?
WASH/RINSE button and
DELAY WASH button
simultaneously, is the
water level frequency
below 26.0 kHz?
(Refer to 7-3)
Check the AIR
CHAMBER,
the tube
(clogged),
and press
switch
CHAMBER,
the tube
(clogged),
and press
switch
Is the coil of the drain
pump too high or low?
(resistance of the coil
is 10-20 Ω)
pump too high or low?
(resistance of the coil
is 10-20 Ω)
(Refer to 9-4 Pump motor
assembly)
assembly)
Replace the
DRAIN
PUMP
ASSEMBLY.
DRAIN
PUMP
ASSEMBLY.
No
Yes
Is the voltage between
connectors out of range?
(NA pin1~ BL3 pin1)
- After remove Terminal
Position Assurance (TPA)
of connector, check as
follows.
connectors out of range?
(NA pin1~ BL3 pin1)
- After remove Terminal
Position Assurance (TPA)
of connector, check as
follows.
- Pump running : 120V±5%
- Stopped Motor/Pump : 0~1V Method
1. Press the Power button, while the SPIN SPEED
- Stopped Motor/Pump : 0~1V Method
1. Press the Power button, while the SPIN SPEED
button and SOIL LEVEL button is pressed
simultaneously.
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 times
Stop the Motor/Pump
[Note] Environmental check list
1) The drainage hose must not stay in a lower position.
2) The drainage hose must not be bent or
1) The drainage hose must not stay in a lower position.
2) The drainage hose must not be bent or
clogged in any way due to the surrounding
physical configuration.
physical configuration.
3) The drainage hose must not get frozen at all times.
4) The drainage pump must not have any improper
4) The drainage pump must not have any improper
substance or material inside that may cause
a machine breakdown.
a machine breakdown.
Replace the
MAIN PWB
ASSEMBLY.
MAIN PWB
ASSEMBLY.
Yes
No
Click on the first or last page to see other WD-15439BDA service manuals if exist.